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Knock / Pinging / Detonation | What does it sound like? [FREE LESSON]
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- Опубліковано 18 сер 2024
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Put your headphones on for best results.
TIME STAMPS:
0:00 - Introduction
0:10 - Equipment Used
0:40 - Plex Data Log Explained
1:32 - Preparing to Test
2:23 - Base Sound (No Knock)
2:48 - Knock Audio
3:29 - Knock Audio 2
3:40 - Lesson Debrief
4:04 - Outro
Knock is the biggest killer of performance engines so it pays to know what you’re dealing with. In this lesson you’re going to hear what knock sounds like and how an ECU can detect it.
This example is applicable to any tuning solution and 4 stroke petrol EFI engine and we use a Plex Tuning Knock Monitor V2 and Link ECU to demonstrate this knowledge in our Nissan 350z on a Mainline dyno.
Want to learn more about EFI tuning? Start here for free - bit.ly/freetuning
Want to dive right into hours of info via the EFI Tuning Fundamentals course? Follow this link here - bit.ly/EFIFun
#highperformanceacademy #knock #ping #detonation #hpa #knockouts #learntotune #005
![Tuning WITHOUT A Dyno | Road Tuning Reflash Tuning Lesson 4 Of 4 [FREE LESSON]](/img/n.gif)
Building a fast car? Get $400 OFF the VIP package with every current and FUTURE course included: hpcdmy.co/vipy5
Kickstart your EFI Tuning knowledge with 50% OFF! Enrol now: hpcdmy.co/offery5
TIME STAMPS:
0:00 - Introduction
0:10 - Equipment Used
0:40 - Plex Data Log Explained
1:32 - Preparing to Test
2:23 - Base Sound (No Knock)
2:48 - Knock Audio
3:29 - Knock Audio 2
3:40 - Lesson Debrief
4:04 - Outro
I just had this video for an ad, I watched the whole thing and just wanted to say great job on the presentation of the information. I've been a mechanic for over 20 yrs and just want to say it takes a lot, especially in an ad, on a car video that I'm currently watching to get my attention.
With that background noise and your style of presenting the only thing you were missing was a flight attendants uniform.
Hahahaha!!!!
🤣🤣🤣🤣🤣
I was just thinking he sounds like a pilot and saw this comment haha
I was thinking the same...
I read this comment before the video started
2 sec in the video i just couldnt say more how rightu arehavava
2:48 for the knock sound. You're welcome.
@@rebeccabecky9814 so is it just like static high pitch rattling noise?
@@stevethea5250 rattling, yes sir
I have no idea why in 2020 UA-camrs are still doing this. Just show us the sound. That's why we're here.
@@42elliott agree 👍🏾💯
@@42elliott have a Google search and see what HPA's business is founded on. They're an education provider - if they didn't explain what they were doing to trigger it, it'd be counter-intuitive to their business model. If you don't want detail, there are plenty of backyard hack videos for you to go listen to.
Put your headphones on for best results.
0:00 - Introduction
0:10 - Equipment Used
0:40 - Data Log Explained
1:32 - Preparing to Test
2:23 - Base Sound (No Knock)
2:48 - Knock Audio
3:29 - Knock Audio 2
3:40 - Lesson Debrief
4:04 - Outro
Want to learn more about EFI tuning? Start here for free - bit.ly/freetuning
M
Want to learn more about knock and EFI tuning? Sign up for 6 free lessons, the first one is delivered to your inbox instantly: bit.ly/freetuning - Taz 👨🏻
How do these knock readings compare to knock voltage that is seen on VAG vehicles? On my VW it is recommended to keep knock voltage below 10 to prevent tons of timing being pulled and damage over the long run. Even when tuned to go above 10 you don't hear it nearly as loudly like you do in other motors I have experienced knock in.
i can confidently say that this man doesn't need blinker fluid.
I unpaused the video for 0.5 seconds and he blinked 20 times in that time.
Someone didn't get the joke
🤣
You asked for more track footage, engine noises and b-roll. We present to you less of these things, in the form of a podcast with a difficult to read logo to boot. You're welcome.
Stream via your favourite service here: www.hpatechtorque.com/ - Taz 👨🏻
I'm a sound engineer and I find this very interesting. I haven't got access to performance monitoring kit but I've tried various mics and low frequency transducers on my engines using audio filters to isolate the different frequencies. It's also interesting hear a slowed down recording.
6400hz is the typical frequency of knock/ping
Thanks for this demo! I have never actually heard someone demonstrate this outside of my own experiments.
I was trying to figure out what was annoying me about this guy. Hes not only knowledgable but also very patient and super clear when he speaks. When he interviews people he knows what questions to ask tuners cause of his viewers I love it. Then I realised what it was. He doesnt annoy me, its where hes from that annoys me. NZders talk with staccato so it doesnt flow. Keep up the great work HPF. Im waiting to buy my Haltech Elite 1500 then Im gonna soak in all that juicy info from your courses. Pretty cheap too considering.
We get a bit of heat about the accent, but we always try to add captions so people have the option of muting and reading if it's too much of a struggle for them. Roles reversed, the world sounds weird as to us accent wise, so that is what we often do ourselves. Some people are a bit mean spirited about it weirdly (not you!) forgetting that there are millions of people out there that no doubt think they talk strangely too haha
Hope the captions help if you just can't get an ear for Andres accent and other than that stoked to hear you are enjoying the content and have picked up on a few things Andre has trained himself to be better at for you guys over the years when it comes to this content.
An Elite 1500 is also a solid investment! Did you listen to the podcast with Scott from Haltech? Gives a bit of insight into his career and a bit of Haltechs history too which I found interesting: www.hpacademy.com/blog/011-do-you-have-to-break-things-to-become-a-good-tuner-podcast/? - Taz.
Very smart knowledgeable man, but I know what your saying. It's the cadence of his speech, doesn't make him any more or less of a great dude.
Another quality HPA informative blog post. Always awesome content 👍💯 Aussie Fan 🤟🆒🤣
wish we had more blokes like you in Sydney , that know how to utilize and actually use saftware.
*o
Most Australian tuners don't want to tell you shit about what there doin. Just wanna make money 💸💰
Wow, coming from someone with 0 previous knowledge, that was very informative and helpful. You’re an amazing teacher
You guys are awesome
I’m proudly an HPA member ;)
Andre, it would be super useful if you could have also shown a wot run with no knock.
My hears are still ringing. Super informative video. Thank you for sharing your knowledge...
thanks.. has been looking for the knocking sound and its very clear. tik tik tik.
Is the hissing sound what knocking and pinging sounds like? Because I don't hear anything different.
Thanks for sharing, always been curious on this kind of stuff
Yo this track fire 🔥👌
Do another 1 please Andre, With a Big Turbo and Antilag. Be Interesting to see how Antilag effects knock levels.
Anyone else not hear anything?
Informative and valuable. Thanks.
I have tried to use knock ears on the dyno and found that all it did was add to the amount of noise rattling my brain. I just ordered a knocklink and I'm hoping it will be a more useful tool.
I feel like he’s trying to send a message in Morse code with his blinking
I had an LS1 that pinged so damn bad just barely giving it gas. There is no check light codes, no vacuum leak, ran Shell Premium, even replaced a fuel pump and filter, and it has a new timing chain. I just took it to the Chevy dealer and let them reflash the ECU. Most of the pinging went away! Doesn't make sense to me how it would do that other than the ECU needing a calibration from wear and tear over 125,000 miles?
KNOCK THREE TIMES song by TonyOrlando!
Here's my favorite & depressing knock n pinging story that I or dozens of techs could never fix. Had a 1991 Cadillac Brougham 305 Chevy TBI LO3 motor that would ping at WOT (sounded like a glass jar of marbles under the hood that's how loud it was!...a little at part throttle. Would only stop on 100 octane. Did every trick in the book....had to run the coldest Delco plug & still saw aluminum peppering on the porcelain & eventual burnt grey melted spot on center porcelain. Used to make my rounds to 4 Caddy dealers back then & they couldn't figure it out. One of the old techs said I was 6 months til warranty expires..... drain oil out, drive it til it knocks, put oil back in & get a new short block which would then verify if it was mechanical or fueling/ecm! I'm sorry I never did it....drove me crazy, & now there's all this new diagnosis technology to verify that problem I lived with for years...... One tech figured the factory resurfaced the heads making high compression ratio with 180+psi.
Man not sure that is a recommendation a tech/mechanic would give today haha How good! I'm sure you're happy to have that long in the past now though eh 😅 Things have come a long way for sure - Taz.
You heard my cries!
My knock monitor is a microphone on a clip, with headphones, on a voice recorder.
Edit: actually not quite the noises I hear, but still useful (I have to distinguish valve-train noises, injectors, piston and rod noises, everything really)
use low cut filter and high cut filter to remove anything lower than 5k hertz and higher than let say around 7.5k hertz. then find the exact knock frequency of your engine (depend on stroke and bore) and amplified it precisely like if its at 6574hz (6550-6600). I just hear ticking when it knock almost nothing else. for me hard part is to link it to my standalone...
Using filtering is a great way to really zero in on knock and remove unwanted background noise. Often though you'll find you get a better signal to noise ratio by focussing on the second harmonic frequency of knock (literally double the knock frequency) which may be around 12-14 kHz.
Sounds like crickets outside in the summer 😆
Thanks sir
Appreciate this.... Getting ready to venture on some old school cpu datalogging and ect ect heard it was addiction at its finest... Will be a new learning experience... Thanks again!
steezyskids appreciate the recommendation... I'll be tuning on a Ford A9P with quarterhorse chip installed for a N.A 347 12:1 build just hoping my 40 lbs injectors will stay within duty limit... Only thing I haven't upgraded to another higher cc..
1. Thanks for technical explanation (sad I don't have the software). 2. I have a Forester 2002 and detected this noise (4 wks ago). I thought it was the PCV valve (balls hitting against its seat by spring, repeatedly). 3. "CHECK Engine" idiot light came about: "Knocking sensor" is responsible for noise being "detected" (??). 4. My impression is the timing belt is extended, and it does not 'make' it under the stress of throttle demand. Suggestion: If you gave the lessons in English, I would understand at the first attempt (just kidding!). Thanks.
man this is a great video, cool channel
So, how did you fix the knock issue that occurred after opening the throttle? 😮
probably by changing the timing curve back to what it was before, since it was changed to purposefully induce knock for this demonstration.
So is this the same sound I should be looking for if using det cans?
Yes, it will sound a little different depending on the engine but it will be similar to this. We have isolated it quite well here so note you might have some more background noise.
We recommend using quality earbuds and then wearing ear defenders/ear muffs over the top of those.
There will be other options that also work, that's just what we have found to be the most reliable with the least 'faff' for us over the years.
Hope that helps - Taz.
I remember in the 1990’s I heard of a few cases where the mega bass competition level audio system in the vehicle would trigger the knock sensor and the timing would retard to the point that the vehicle had very poor performance.
To me knock strategies deserve a lot more attention than we give them. In racing or wanna be racing, to be competitive we must push the engine all the way to the limit and knock will be the indicator that we are there.
Ha! That's a throw back. Instead of audio 'sound off' competitions these days I think they do a rev thing?
Knock is really more an issue with performance street cars that are not running 'race fuel' or in class racing where there are restrictions on what you can run. If you are running E85 or methanol etc etc, save for larger cooling issues, you're generally going to find MBT before you find knock which is why there is less of a spotlight on it in motorsports - Taz.
That's all an urban legend...
Knock sensors are tuned to pick up frequencies in the 6400hz range. Well ABOVE any bass frequencies.
@@davelowets could be true as I’ve heard similar but from bad wiring causing stray emf and retarding timing
Very cool video. Thanks
With headphones it sounds just like putting pop rocks in your mouth
Man, I haven't had those for a few years! - Taz.
Last time I saw those a girl was... nevermind it was an interesting experience lol.
Hahahah... nostalgia
Great video, a lot of work is coming for me!
It sounds like shaking a bunch of bb's violently in a coffee can. The first time I experienced it was with bad gaa and I thought gravel was flying up off the road and into the underside of my van!
AMAZING channel!
So I advanced my distributor all the way and floored my car! The video is new and on my page.
I've seen knock being detected on the dyno, using ear defenders modified with hose thats then attatched to a copper section, bolted to the engine!? It sounded like crisp packets being crumpled!
excellent video! thanks
Hope it helped 😎 - Taz
thank you !
I gotta say, this is an absolute blink fest.
Thanks! We do enjoy a good blink - Taz.
leave my baby alone or I will find you and take a dump threw your letterbox
I couldn’t hear it
I need to take your corses soon, just to make a couple of things clear before I boost my car some more. By the way, I watched some of the free lessons and I gotta say they were a big help.
Great video.
Thanks again for an informative clip guys, legends.
the "knock" i heard in a V8 engine i used to have sounded like a spray paint can shaking...
PANTYEATR1 Yes that's how I explain it to people. A marble in a coke can.... That's via in car only on the road and not wearing any knock detection headsets.
Most people that do hear it for the first time mention there's something rattling in the exhaust and they aren't far off lol
Knock will sound a little different from one engine to the next but your description is pretty accurate. Using audio knock detection equipment this may sound slightly different though depending on what the digital signal processor does with the raw signal.
What causes that sound, and is it present only when car accelarate and going uphill? I have it, what can i do, is it dangerous for engine?
@@strahinjapantelic2869 Basically,t he sound, or "knocking," is when the flame-front caused by the spark plugs in the cylinder (the combustion) meets other flame-fronts that combust due to more compression and/or temperature than the fuel itself can handle before self-detonating. Instead of one clean flame-front per combustion per cylinder, you get multiple flame-fronts which can cause issues.
It can happen at any time, really, depending on what is going on with your car. If you're going up-hill and it's occurring while you're accelerating up it, it could be that the combustion temperature is too hot (which could potentially be caused by a faulty EGR system, which is relative to your emissions), or your engine might be starved of fuel under that certain amount of load, RPM, and throttle levels. It's unlikely that your car's computer needs tuning. More likely is an issue preventing enough fuel from reaching your engine, such as a fuel regulator, fuel filter, or fuel pump that needs replacing. Of course, before going forward with any repairs, make certain of which issue it is before you spend money on new parts.
Knocking is dangerous for your engine's health. Depending on the severity, it can be anywhere from potentially minorly damaging all the way to "this will destroy your engine within a week or less."
I would absolutely avoid putting the vehicle in situations that cause the engine to knock, if at all possible, and get it looked at and/or repaired as soon as I could.
@UC88GZPTeS9Xml2YajWO-qxw thanks for such details and explanation...but, why my engine have that sound only when its hot weather, at night is ok, and at winter is fine, no sound, but in summer he makes that sound only at acceleration and under load due to day time...my mechanick told me everything is ok, maybe valve adjustment, and bad fuel but on this model that issue is not common...thanks again...
Is there a way to get setup knock sensor on the Platinum sport 1000, engine is a Evo 8 am wondering if this stock or a bosh knock sensor could be setup on this particular ecu...
If the ECU does not come with knock detection/control, you will need an external knock monitor capable of outputting a 0-5V signal to an AVI input on your ECU. Check out the Plex knock monitor v2 or the Tuner Nerd knock detection system. Another good one is the Link Knock Block which has dual knock sensor inputs, but no 5v output to ecu. It is used with headphones for audible knock detection only. This is an old comment but I was also wondering the same thing for an elite 750 a few days ago. Maybe this will help someone in the future.
What knock detector was in your opinion the best you have used? I’ve seen many tuners use something almost like a medicinal amplifier with a hose.
Definitely not that, piezo microphone all the way.
From there Links Knock Block unit is very quick and easy to use, or the Plex unit which is aimed at commercial operations that see a lot of tuning and the features reflect that.
Tuner Nerd have a product that is in the middle of the two that is good, but like the other two products has it's own compromises as well - Taz.
PS: Here's a quick and dirty list: www.hpacademy.com/technical-articles/audio-knock-detection-systems/?
what is your opinion on the Alientech KTAG?
Seems like a good entry level model to play around on a beater car
I have one question for you, I have a problem that knock happens at high revs, over 5000rpm it happens, and below 5000 everything is fine, the fuel mixture is excellent 12, lambda ok, fuel pressure ok, fuel pump ok, im driving on Vems ecu, so what do you think is the problem ?
Hey Andre, You've probably answered this question previously but where is DOCILE these days & is it still a fully functioning drag car? Correct me if I am wrong but Adam acquired the engine out of it for his vr4? It was such a dominant car in the nz import scene at the time & would be cool to know the history of it once you retired it from racing
Hey mate, the rolling shell is sitting in the museum at Highlands Motorsport Park. The engine was sold and I believe it's now overseas. Not sure if it will race again. Time will tell :)
the sound quality was not good enough to be able to discern what to expect ..
What are you listening to the video with? Use some headphones if your speakers are not up to the task. This is almost as clear as knock is ever going to be for you :) - Taz.
It's quite possible to have a particular engine where the knock sound is more prominent, however in my experience you're also more likely to find the knock signal to be worse than what we've presented above. If you're using a good quality head set and you listen to the explanation of what you're hearing, you should have little trouble detecting the knock.
they arnt actually listening to the motor. this video is really stupid. they essentially hooked a electrical signal up to a speaker.
thisisntme they are listening to the signal produced by the knock sensor which is essentially a microphone. oem cars use this method as well.
Thanks for your input there @Gary, I had missed this comment.
@thisisntme, correct, and this is the best way to monitor knock. If you are just trying to listen with your 'naked' ears by the time you hear the knock it is too late. Watch this video to understand how this works regarding the sensor, which starts with a microphone so technically even though the signal is converted to a digital format, you are listening just in a way that is actually effective - ua-cam.com/video/N6lbBCqAGvc/v-deo.html
And read this to understand why your ears are not as good as you think they are if that is the only thing you're curretnly using - www.hpacademy.com/technical-articles/dont-waste-your-time-listening-for-knock/
If that doesn't clear things up come back with some questions and we'll help explain it further for you if we can :) - Taz.
Hi sir if my link come out 122eror code injector max duty cause from fuel pump can we clear code by remove battery terminal?
Probably a silly question but how does engine speed stay constant at 2000 RPM when you go WOT?
Not silly at all, the dyno we use holds it there. You set what RPM you want (after initial setup of the dyno) and then you can move through the load cells, tune, and bump it up to the next target RPM and repeat.
Once you start to get higher into the rev range, you start doing sweeping runs so you're not revving it out too hard and doing damage - Taz.
He gave his answer but thought I would add that since he mentioned the car was in 4th gear, and therefore the transmission engaged and wheels were spinning, you could simply just use the cruise control, am I right? That should maintain the rpm’s as well.
You couldn’t do this in neutral though. If you did, I hope your rev limiter is working correctly, or you’d have a lot more than mild knocking to worry about
Yup, totally
You should do a Version of this Video of a Rotor !!!
The sound of knock in a rotary is just one loud bang as your internal components convert themselves to external ones instead. They don't tolerate knock/detonation at all.
We do go a bit deeper on this in a paid members video here though: www.hpacademy.com/previous-webinars/043-rotary-ignition-tuning-link-g4-vipec/ - Taz.
I can imagine how difficult it would be to hear that even with headphones while there's an engine at full throttle right in front of you
Yes it can be very difficult on some engines, but you are doing sweeps and do build up to full power runs so you can get a bit of a feel for things rather than just jumping in and going balls to the wall straight off the bat ;) - Taz.
Does anyone know if a factory ecu will tell you if you have knock? Would it throw a code and give you a check engine light?
My boy blinked like 130 times in 10 second 😂
so in theory you could take that audio signal , route it back into your auxport/amp whatever and listen for knocks on the go? or is the sensor (or i asume a sort of microphone) a thing you addon at the dyno or something and completely diffrent from the actual knock sensor in the engine?
the old school method is bolting stethoscope to the cylinder head, similar concept. but after tuning properly you shouldn't have to drive and listen to knock. in this video it seems as though he's routing the knock sensors signal through a computer and using it as audio, if not it's just a microphone right up against a head
There will be at least one knock sensor going to the plex knock detection device (audio) and at least one knock sensor (more likely two) going to the Link G4+ ECU (the graphs)
Frietpan Yes you could but it's heaps easier with a passenger doing the listening or at least helping with it!
I've got a simple detonation detector that the Autospeed website put up years ago. The updated version I used is a simple sonic hearing unit (like what some old deaf cunts use). Just cut the mic, attach to a alligator clamp and extend the wire. Doubles as a locator for other noises like fucked wheel bearings, CVs etc....
For the knock audio we're using a standalone system from Plex called a Knock Monitor. This is used when we're tuning and then removed from the engine. Using this system the tuner can constantly listen for knock from the engine while tuning. The datalogging in the G4+ ECU on the other hand comes from the two factory knock sensors bolted to the block so the systems are actually independent.
Im looking for a tuner in dfw area for a micro squert car. You dont happen to have one you recomend ?
No sorry, I'd ask around your local car and motorsport clubs personally :) - Taz.
My 132cc moped does this sound when I set the ignition timing too advanced 😅
What compression was the 350 running? I'm hoping to go 12:1 on premium fuel on my zed, any advice appreciated. Sweet video btw 🤙🏽
Good luck. Not gonna happen without pulling excessive timing.
Okay so I own a 2013 Kia optima sxl turbo, and i purchased a racechip gts tune, when I first bought it, the tune worked fine and at max power the car launched like a gem. Now each time I use it and give the car heavy throttle it knocks and definitely sounds like the marbles in a tin can (or same sound as when you turn off a hot engine and hear the ticking)......i can stomp on the accelerator with tune deactivated and get no issues or sound, but the second its on the car sounds horrid at heavy throttle. The racechip itself does not interact with the ecu but connects directly to the map and turbo boost pressure sensors. Anyone have any insight on what could be the issue? Definitely not the engine (was replaced barely 2k miles ago)
Is this part of ecu tuning course or EFI Tuning course package?
Both =)
It's from the EFI Tuning Fundamentals course which you can buy by itself, but it is also including in the package deal.
It is 100% the course you want to start with, it covers all the basics to make sure you start on the right foot, even including a little bit of wiring knowledge - Taz.
Any chance installing a bigger battery on my 4 cylinder van (i went from 70AH OEM Led Acid to 115AH marine deep cycle) and now noticed slight detonation/spark knock at around 20mph to 40mph. it's very slight. My alternator is 160Amps. Not really sure it's related. I noticed it does not do it with super unleaded.
Actually it could, hotter spark means more heat more voltage means more spark, look at a plug chart for the brand plug you’re running and go one step colder
Andre blinked 84 times in the first speaking segment.
what what fuel was used when you where tuning your Nissan.
This is just our local 98 octane pump gas. The engine really isn't knock limited on this fuel under normal circumstances.
@@hpa101 Does knock limited mean having a knock sensor? N/A engines haven't these usually, right?
So there’s a rod knock and this is what ignition knock? Sorry confused of the knock of a car lol but great video understood what you meant
Its Pre ignition knock.
06 cobalt sc when climbing a hill in high gear increasing throttle I can hear a ping peck type of sound an some cases when accelerating it's like I take foot off throttle for split second I have no way to data log .. should I start with the phaser solenoids??
If you're not already using the highest octane pump fuel you can, I would start with that - Taz.
What kinda mic is that? sounds pretty good!
Just a piezo microphone, they're pretty generic. You just need to try get one to match what bolt thread you have on the block, although you can drill them out in a pinch if you're stuck - www.msel.co.nz/Knock-Sensor-with-2-Way-Mini-Timer-Connector - Taz.
Sounds like my hard drive seeking...
would this be the same for every ecu
My 02 crv is pinging and I don't know why. 0 codes :(
bcs its Honda :P thats why....
I have seen people claim you can see spark knock by the exhaust. If this is true how does it effect the exhaust look?
Pretend the title of this is 'Don't waste your time looking for knock via your exhaust' and you'll have your answer 😅 - www.hpacademy.com/technical-articles/dont-waste-your-time-listening-for-knock/
TL:DR: Your people are incorrect if they're talking about what we're demonstrating here, you need audible knock detection to monitor knock or to setup your standalone ECU to do it for you - Taz.
@@hpa101 thanks a lot. I wasn't sure how it could be possible if at all to see knock from the exhaust. Will watch that video.
Edit: my bad not a video. I read the article.
Does it sound like one of those click clacking toys or castanets .
it's like a slight clapping sound normally I notice that when I drive around with the air conditioner on it happens to my car around 1,500 - 2,500 rpms . I recently changed the knock sensor which was faulty in my car what causes that sound ? The car is running fine
Take a read of this article Don. It's going to help answer these questions for you and more :) - www.hpacademy.com/technical-articles/dont-waste-your-time-listening-for-knock/ - Taz.
Is it possible to add a knock sensor to a setup the doesn't natively support one?
My engine is from 1976 but I'd like to have some kind of knock detection.
Yes sir, for tuning you can use a standalone audible knock detection unit like the TunerNerd Knock Monitor, and then there is the mac daddy Plex Knock Monitor Pro as well.
From there if you're running an aftermarket ECU it depends what features it has for what you can do regarding onboard knock control - Taz.
@@hpa101 thanks for the heads up, I appreciate the response.
I wonder if it's possible to have a knock detection light, trying to keep the electronic engine control to a minimum.
My corolla and yaris when i hit an incline there's a slight pinging then it goes away, i assume it's the car controlling the timing under load?
solved a problem?
That doesn't sound like any engine I've ever heard.
Hmm. How many V6's have you listen to through a piezo microphone? - Taz.
What is physically happening to the engine components when a cylinder ‘knocks’? What causes it?
artdamage0 when the cylinder heat increases dramatically the injected fuel particles will combust due to the heat before being compressed properly and ignited these random combustions do the most damage to the engine components
HPA course will answer all your questions those guys are awesome :)
To add on to what silver said -it happens while the piston is traveling up on the compression stroke hence why it causes so much damage.It is also called preignition at times and as you can imagine the fuel igniting tying to push the piston down while its going up is not good ;-)
Not exactly, what happens in knock is that the fuel is self-ignited at more than one spot causing the flame fronts to crash to each other inducing a shock wave and a spike in pressure which "shakes" the cylinder walls causing the block to "ring". Pretty much what you would hear if you hit the engine with a hammer (from the knock sensor point of view)
There's a few replies here that offer a pretty good explanation which I'll add to. Essentially knock is the auto ignition of unburned fuel and air around the outside of the combustion chamber. This occurs after combustion has already been initiated by the spark plug. As combustion continues, the heat rises in the combustion chamber and these pockets of fuel and air spontaneously combust. When this occurs, the energy contained in the fuel is released very rapidly which causes a large spike in pressure in the cylinder. It's this spike in pressure that can be so destructive. Note that the audible sound associated with knock has nothing to do with colliding flame fronts (think about twin spark plug engines which by definition have two colliding flame fronts under normal operating conditions), but rather it's caused by the engine components resonating.
High Performance Academy so to induce knock in an engine like you are in the video are you simply leaning the AFR out?
Performanance injins?
That's just the accent
Will this knocking noise damage the engine and its components?
It depends on where it's occurring, and also on the engine. On low stressed NA engines, it's not ideal but also it's always going to be an issue even at high RPMs. On an engine that has forced induction or a highly stressed NA it can quickly cause catastrophic damage - Taz.
Why my fiat punto 1.2 8v engine have metal sound like for example little hammer hitting fastly on some metal...that sound i can hear when i accelarate and going uphill, only in that case...what can i do about that? Thanks
Maybe low oil?
@@Blue__244 no man, oil is fresh, quality one, near max level...works fine...just that noise on acceleration and uphill killing my ears, i cannot hear it when windows is closed, just in summer when i open it, so its not loud, but, just like somebody hitting constantly with little hammer inside engine...i heard its detonation due low octan fuel but im afraid to destroy engine... 🤐
New video title: “RELAXING ASMR cicadas and calming NZ accent” you’ll go viral thank me later 🙏⚡️
can you control the knock threshold value? if so then how do you decide the value for it?
Yes sir. This is something you have to set up to ensure it is accurate. We cover this in our course material and members only webinar lessons. If you have any questions feel free to email me via support@hpacademy.com
There is a small Q&A video on it here but I'm not sure it will help you or not as it's just an answer to a question rather than a full lesson on it - ua-cam.com/video/PzMN3zx5niI/v-deo.html - Taz.
Thanks for the reply !
I have knock sensor problems .it happens when I'm driving down road it jurks momentary then stalls At stops?
Might have sounded like your 86 ! Ouch that did some damage .
I think if you had knock headphones on when that valve let go you'd have lost an ear drum haha The 1UZ was running E30 so pretty much 0% chance of knock for it given that and being NA, however there's always more to go wrong with engines. At the time we were happy to take the risk knowing something wasn't 100% and just hoping to last for that last meeting - Taz.
On an rb25det can it still knock whilst in vac?
Any engine can knock at any rpm if its running too lean. Just because you're not in boost doesn't mean your afrs arent lean or your timing is advanced too much
That is why the engine gods gave us water methanol 😆 🤣 😂 and it was good 👍
We've had mixed success with that and prefer to just use a higher octane fuel instead where knock limited.
All depends on your application as to what is the best for you - Taz.
Explain to me like I’m 5
Why is the Engine RPM just above 2k when using full throttle?
We're using a load-bearing dyno which allows us to increase engine load while holding the same RPM. This video dives into things - www.hpacademy.com/blog/steady-state-tuning-how-is-it-done-inertia-vs-load-bearing-dyno-tech-nugget/ - Taz.
You sound like a Kiwi but pronounce the “Z” in “350Z” like an American. What is this madness?
Just keeping you on your toes there Thomas. Planning to throw some Cockney rhyming slang into the next one ;) - Taz.
No audible knock was demonstrated in this video. If you're searching for knock videos, this is not one of them.
What are you watching this video on? - Taz
So basically when your WOT and screaming along your not gonna hear shit through your exhaust haha
You should still be able to hear knock over your exhaust. The knock sensor is attached to the block and then a knock monitor feeds the signal to your head phones. We recommend wearing ear defenders over your headphones :) - Ben
@@hpa101 Thanks for the reply but without headphones on the street is what I was referring to.
@@Starsquish you can't hear it without audible detection to any useful degree on the street, on the dyno or in the bathtub, it doesn't matter. Headphones are always the way to go - Taz.
Sounds like crickets
i always describe it sounding like when you eat popping candy like pop rocks
I miss those days/diet! - Taz
Right, sounds exactly like someone knocking on your door. Right. And my flatulence sounds like Mozart.
I don't think we've ever described it as someone knocking at the door. Unless that someone has tiny metallic hands? 😅 - Taz.
@@hpa101 lol, yeah I can't remember where I saw that, but someone said it was called knock because it sounded like door knock.
I think the problem is 'bearing/rod knock vs. Pre-detonation.'..
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