FrankenBriggs 6 Cylinder 1st Run!!!!
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- Опубліковано 5 вер 2024
- The first run of the 6 cylinder Briggs. There is lots of backfiring and some smoke, but it runs for a minute straight. It looks to me like I have some tuning issues with the carb feeding cylinders 4,5 & 6, since it is the one backfiring. i have to stiffen up the coupling guard for the distributor drive as it was vibrating around.
I created this video with the UA-cam Video Editor ( / editor )
Your mechanical skills are amazing, good job,congratulations.
So cool, great hearing all those Briggs engines singing in unison!
Stay tuned, i plan to have the 8 cylinder going fairly soon.
@@ChargerMiles007
I’d like to see that!
I love briggs&stratton engines no matter the condition, it doesnt take much to get them running again.
True, is your name actually Miles, like mine?
I love the Harmony of all them engines working together
This what happens to mechanically inclined people with free time.
LOL :) yes, you have that right!
your right on that I wish I had spare time I have a lot of projects on my mind
I keep trying lol!
I would eventually if I had the parts.
And money
This is for a lawnmower that no only cuts the grass but shaves down any boulders that may be sticking up.
IT sounds a lot like an old-time airplane engine! Great exhaust note, right there! Well done!
That was my thought also.
whenever i see such a ramdom engine like this. I wonder what i could put it in.
Mr Rees yeah cbx comes to mind
Tim Mungenast love the old Merlin's and radial engined they are sweet it takes a half day to get one of those radials started lol prime spin it over pump the oiler prime it some more spin it over cut magnitos on prime it spin shish somebody else gonna have to pilot while I'm sleeping lol
Amazing effort you put into your project, wonderful to see it up and running. Thanks for showing the build progress and the start up, brilliant!
Looks like the next generation of Harley Davidson being developed here at there top secret state of the art testing lab.
this was an excellent,work ,like the way all crew was cooperating throughout .
Thanks, I know I raise my voice a bit on another vid, when my wife keeps the starter engaged after the engine is revving :)
It's your intake manifold! It needs to be completely redone .Your feeding 2 and five straight threw. The other engines can't pull enough fuel . The reason the back one is backfiring is because that is a lean back fire. Obviously it will run but your losing power because there all connected together and running un even . Hope this helps you. And pretty cool.
Maybe a big leaf blower on the carbs,
Beau Gant i think that if he change the firing order it will work better
wouldnt matter would still run lean...
I want to see them run with a sheet metal intake and 3 2 barrels jetted down. lol
Lack cooling fan on 5cylinders,could risk seizing up.
Gives a whole new meaning to inline 6.
LOL
your intake manifold has unequal lengths so cylinders farther from the carburettor are running leaner this is causing the hot exhausts on those cylinders
Stephen Hayston so will it sound like a subie?
Subaru's have unequal exhaust headers, not intake manifold lol
Yep, 1 3 4 and 6 are running leaner than 2 and 5
The AMC 258 has unequal length runners and runs fine
The AMC's outer intakes are grouped, a design difference probably vital in the "running fine" process. I could be wrong, just a guess, have a nice day
That is so great. And would never quit running.
I'm pretty sure I had that engine setup in my Renault Encore. It didn't look like this one, but it ran EXACTLY like it.
HaHaHa lol , Your engine must have had some serious issues! This engine wasn't running on cylinders 4 and 5 on this vid, in spite of the smoke coming out of them sometimes.I resolved the issue on my third and last run of it. Hard to say what was wrong with your car.
Lawrence Genereux lol
Finally! Now you can build that edger with the 42 inch blade you've been putting together in your head.
lol, right on!
One thing you forgot...COOLING for the other 5 cylinders.
Forgetting the wife...YOU will pay for that!
All in all a cool build!
I didn't forget about cooling, I did use large box fans on some of the runs. I just don't run it for more than a minute at a time, but that is more than long enough to P.O. the neighbors, especially when I removed the mufflers on the 8 cylinder for the uncorked run! :)
This isn't a practical way to build an engine for long life, I understand that.
Really cool piece. Must feel pretty rewarding making that engine.
Yes, it was nice when it fired up, and ran fairly well :)
Give a lot of credit. Took a lot of not only machining skills but a fair amount of brain power too.. I wonder if a V-6 Configuration would alleviate some of the issues?
A V-6 has a common crankshaft, so if you configured it that way, it would be two straight-3's
Hi fla.
Part of the reason the starter can handle the load is that only one cylinder at a time in on the compression stroke at a time., I do hope than you have set them up to use a standard 6 cyl firing order. That way if there were securely fastened to a stout frame, there should be very little vibration. For many years, Rolls Royce used only 6 cyl engines and they were famous for there smoothness. I studied engine design while in Mechanical Engineering and have kept up with modern variations.
Sounds like it (the distributor) was running backwards, perhaps ??
Dave Alexander it was the V8 that was renounced fo smoothnes
An inline 6 or 8 is inherently smoother than a "V" configuration due to the 120*(6cyl) or 90*(8cyl) firing of the cylinders. The "V" might be even fire at the distributor, but the crank throws are uneven for rotation of the crank and placement of the cylinders. It's inherently unbalanced, which is why it needs a huge harmonic balancer up front to keep it from self destructing.
I've been driving inline 6's all my life (I'm 63) and my Dad's '37 Buick Sedan since I was 13. The inline 8 on that monster is smoother than any 6 cylinder I've ever driven. Put a glass of water on the head (flathead) and it barely ripples compared to a 6 @ 600rpm.
Can't wait to see your next video hope your 6 cylinder becomes a big success I used to have a mini dudle bike when I was just 8 years of age " I'm 53 now * I haven't road eny motorcycle since.. last bike I road & owned for a week .. after the mini Dudley" was in 1982 it was a 900cc hard tail kawasaki custom..
Strap that thing on a go cart and pray you got brakes lol. Awesome build by the way 👍
I caught a hint on a Jeep 4.0 sound there once it got going smoothly. Well done sir!
Thanks 👍
Very good. If you not trying, you´ll never know. I like people that get things togehter, and just not sitting in front of their tv and says Hell that´ll never work!!
Thanks for your support! i do catch some flak for making these youtube only engines, luckily there are people who understand why I do it! :) A 7 cylinder is in the works for next summer.
ChargerMiles007 Great! Let's hope you'll get a good run.
As the journey is the destination, , being able, and having the ambition to do something like this is its own reward...
Thanks for sharing, and keep up the good work.
Very well said!
just one thing! How do you keep the other engines cool when there is no cowling on them apart from the first engine, they are air cooled and need a flow of air over the cylinder fins to stop overheating , can't see it taking long before they run really hot ;( apart from the first one 😳
You done a great job, to many "experts" on here, glad you have the patients for them.
Thanks, yes a few of them have gotten under my skin, but I try to remain calm :)
You need to heat that intake manifold. The runners are too long and the fuel is falling out of suspension before it gets to the outside cylinders. That is why they are running so hot or not at all. They are running extremely lean. so you either you need to heat your manifold or put individual carbs on the machine. I really hope this helps you get a good runner out of this machine.
Or make every manifold pipe equal length.
That's just what I like to c someone creating a beast by hand awesome job friend
Thanks, glad you understand why I built it, some people don't get it. I know it has no practical purpose unless i mount it in a tractor or something, but sitting beside it and manning the throttle is quite the experience. You are not normally so close to this large of a running engine.
sounds like one of those radial engines for like a plane or whatnot
sounds good love Briggs engines
Not practical but really cool. Not many people could claim such a feat. How did you handle the timing issue? Did you set each engine 120 degree out of phase with each other to get 3 power strokes per revolution? I think running 6 linked carbs would be better or, tune the length of the intake pipes for more accurate fuel distribution.
Yes, I did phase the cranks 120 deg out of phase, and used a 6 cylinder firing order of 1,5,3,6,2,4. True this intake set up wasn't ideal, I just tried to keep it simple enough that I could build it in a reasonable time frame.
ChargerMiles007 Very impressive. I enjoyed your 8 cylinder video too.
Yes, the 8 ran much better than the 6, I think having the spark advance working correctly played a big part. The 6 had trouble revving much over 3000 rpm, but the 8 liked to hit 5000 or higher! Eventually harmonics in the engine broke the powder metallurgy crankshaft gear on #5 cylinder, so i packed it in. It is quite repairable, but fall was moving in, so I finished and ran the unlucky 5 cylinder a few times, then put it all away for the winter.
Roy Riederer zs
+ChargerMiles007 sir if the cranks are all welded together you must be a guru at getting the joints trued up after all the welds pulled a little one way or the other.
glad to see someone still thinks outside the box!
Thanks for your understanding :)
5 of the 6 don't have any cooling fans or housings
Yer gonna melt 'em down if you run it much.
andTo861 I don't think 5 fired
Oh for God's sake he's only fucking around.
Crazy Canucks - one running cool and five cooking.
5 and 6 don't even appear to be firing looking at the muffler color
kmcwhq harleys don't have cooling fans,,I think these have the fan built in the flywheel, ,now no shroud may be a issue if this motor is not put into a moving vehicle to have are passed by the cylinder heads or Cooling
i see a very long and powerfull go cart here. Great work man
Good stuff Bud!! You had that thing pissin' and fartin' like a Top Fuel Funny Car!!☺
lol :) Yes, it sure was putting up a fight, maybe I woke it up from a nice dream or something!
I hope your radial runs better than this does :)
It would probably run better if you had 3 carburetors on it instead of 2, carburetor per 2 cylinders
alex pencek I concur.
how do u connect the crankshafts between motors? gear ratio/teeth? also, do you multiply the torque/horsepower to get the total combined HP? I'm very interested in this. thanks
+christopher chance allot of welding and modding
Front carb is much leaner than the rear. You can tell by the color change on the brand new mufflers. I wouldn't be surprised if you are only getting power from a few cylinders and the rest are only along for the ride.
Problem with starting and low rpm idle is the intake manifold... there's no way that the carb tune for cylinder 2 is right for cylinders 1 and 3 ... by the time the mixture has traveled that distance and made the 2 90° turns in that size tubing it isn't atomizing well anymore at low flow... you can see it runs better at higher rpm as the airflow starts to overcome the imbalance in the manifold... use 3 carbs with manifolds set in a Y configuration with equal distance to intake, and your idle and starting worries will be solvable with proper carb settings. (this is awesome btw 😈 ... I work intake 6 cyl for boat engines... your minor problems totally look like intake config... try and get a faster starter motor speed to get running easier with your current setup)
also you can see that cylinder 1 and 3 is running lean and therefor heating the exhaust way faster than the other ones
I agree. 6 1 barrels may work better.
or ... throttle body fuel injection :D or even direct fuel injection if you were crazy enough!
fla playa
Direct fuel injection is a nice suggestion. But of course he cannot do it with those engines
All intake runners need to be equal length and fed off of 1 600cc 4 barrel carb. It looks like a nice set up. You could possibly run 6 briggs carbs since these engines are basically sucking the gas out of the bowls and use of jets is at a bare minimal. So fine tuning 6 briggs carbs would be a piece of cake.
With each added cylinder you add more torque but you don't beef up the bottom end. You're putting 6 times the torque the cranks are designed to handle. If you really loaded this thing you'd blow the bottom end in no time.
For a cold carburetored 4 stroke engine set the choke closed and open the throttle 1/3 open. When it starts, back off the throttle and then when it begins to warm up open the choke slowly.
Sounds about right, my problem here is that I need 3 arms, one for each choke, and one on the throttle shaft. not many people are brave enough to get that close to it! :)
I think the other 5 engines need their blowers & ducting to keep cool. It'll take some extra machining and parts, but it has to be done.
I was thinking the same thing. The last 5 will overheat rather quickly.
.....glad that someone mentioned that. The flywheel has cooling fins(as well as other functions)that are ducted to the head by the metal cover.
I hate to sound like I am judging such a good project. It is what it is.......very interesting and a good demo.
Yes, you are correct, all but the first cylinder need additional cooling air. I was not able to keep all of the normal flywheels the way i made the couplings, but it seems to run fairly smoothly with just 2 flywheels instead of 6. I could add a small dc fan onto each cylinder for cooling, instead i just run it for a minute or so at a time, otherwise I get complaints from the neighbors! :)
ChargerMiles007 - That's why you need acreage land. ;-)
You put some work into that.That is a nice build.Every one talking about why and useless instead of just admiring the build are the same people driving around with a picture of something blocking their check engine lot so they don't have to see it.
Thanks for understanding my build concept. I know it can't run for too long before it will overheat, and the 2 carbs are not the best set up, but hey, it works.
I happen to have some electrical tape covering the engine light, as it stays lit do to a EGR snafu which I will cure when it bloody well decides to warm the heck up here!!! :)
Now all you need is a really WIDE go cart!!!!
Or A Real Long One
+srrings Well go cart motors are usually mounted transversely.
ur right, a wide ass gokart xd
That's going to make some lawnmower a legend.
Add cooling for cylinders 2-6 and convert it over to a megasquirt EFI.
it should have fair & sufficient cooling system flow to all cylinders....
HOW?
Exactly, you have to have a fan and shroud if you run it for any amount of time or it will eventually overheat and lock up. If its just for demo and putting for a few minutes then its fine.
Adding fans and shrouds after assembly on a Briggs and Stratton Centipede... hmm
This guy is a genius!! Love this stuff.
Thanks, check out the FrankenBriggs 8 cylinder, it runs much better than this one!
That is so cool.
Thanks, glad you liked it!
Yeah - lots of comments on intake/fuel mgt. But I was lots more concerned about running up the RPM on those splash oil lube systems. They are not capable of proper lubing at high RPM. But it's all fun! Very cool. I doubt he wanted to set up vacuum indicators on the carbs to balance the flow. Just experimenting. Binford 9000!
One carburetor for each two engines would probably work better. More even mixture. By the way. Why was it built?
I had made a 4 cylinder, and planned to make an 8, the 6 just came before the 8.
What you use it for? Jusy hobby or something more?
When I was a kid I strapped a 5 horse upright Briggs engine to an old AMF Roadmaster moped. It used to have a 49cc engine that drove the rear tire. I got it to 45mph......once!
LOL, sounds like the kid next door to us, my son sold him our old mini bike that had a 3 horse on it. His father and him shoe horned an 8 horse Briggs onto it, the engine was so large that it stuck way out to one side, man that thing was a Beast!!!
Great ,but what are you going to use it for?
kennedy singh
You sound like someone's mother. P
+Scottie1152 rite?
kennedy singh true
30+ horse power??? Wow!
If you have to ask that question....then you really dont understand why he built it at all....!!!
I noticed your DC power supply, a welder. They work great. It works to jump Lincoln SA200's too. Just hook the leads together (momentarily) to crank the dead SA200.
that's some serious boredom being cured right there.
lol :) Happy New Year!!!!
Very cool .... sounds a lot like an aircraft engine ... I like the comment about adding a third carb....two cylinders on each ...
3 carbs would have worked better instead of 2
Yes, I agree, equal length runners that way.
It needs equal length intake runners from the carbs. the center 2 engines with the short tube's are getting a air/fuel mix faster than the other 4. should have just used 6 individual cars with a adjustable jet. This is a good start at something like this. But I'm more interested in tig welding a few v-twins together to make a V12.
did i hear led zeppelin playing in the back ground
The Led Heads sure did!
Whole Lotta Love
I heard whole lotta love in the background, nice choice of music ;)
In parallel but not a six cylinders but it is six cylinders 🤔😭
twotwocold i think what you mean is that it's a 6 cylinder but not a v6
> I think what you mean is that it's a 6 cylinder but not a v6
I think what you think he means is that it's a 6 cylinder but not a straight 6.
It would be nteresting to see what this engine looks like in stroboscopic light, I dare say the vibration patterns of where the various masses are in the line is affecting the smoothness of it's running. It will perhpas be trying to retune itself?
mark p, it’s 6 different blocks, 6 separate cranks, 6 separate cam shafts and the list goes on. It’s six engines mounted on a rail.
All the crankshafts are pinned together so it runs as 1 system. Detroit Diesel did the same with their 12v92 GM's that consist of 2 x 6v92 detroits with the crankshafts pinned together to run as 1 12v92.
You are correct. This isn't a 6 cylinder engine. #2 by the starter didn't run. The muffler didn't turn blue.
I know this is done "because it can be done" but for all practical purposes the weak link will be the crankshaft because the total output comes at the flywheel end, which was only made to handle a single cylinder. If this were to be used with some particular project in mind I would be looking at each engine being independent for both cooling and fuel then coupled to a common external driveshaft via a belt. That way if one fails you have the rest.
Yes, your idea is correct. The output of this engine would be limited to about 15 horsepower, or it would twist the shaft off of the last cylinder. I have heard of someone ganging 4 small engines together chained to a common output shaft, with each being a complete engine , apparently it was a successful project.
Personally I would shy away from a chain or gear drive because there's no easy way to properly lubricate it and get rid of the heat generated at speed. Yes, it's done on motorcycles, but consider the drive wheel is only moving at a few hundred RPM at highway speeds, plus air cooling due to traveling down the road. Doing multiple engines with belts and centrifugal clutches would allow so much more freedom, especially if one engine fails. You also have the option to stack engines in a variety of configurations around a common shaft, only limited by the pulley width for your offset.
Oh, one more thing, thanks for recognizing why I built this engine. I get a bunch of comments asking what use this is, or why did I make it. I did want to see if it could be done, as well as see if my connection method would hold up, plus I wanted to hear what it would sound like. I got a bit carried away at the end of the vid, but I had been working on building this for about a week straight, and that didn't include building the various engines, and finding all the couplings, chain, distributor, and making the starter flywheel, so I had a lot of time invested into this, so I was very happy when it finally coughed to life.
True, there would be some advantages to using a belt drive. I hadn't thought of stacking engines around the output shaft, but that would shorten it up for sure. I wounder if the engines would have any problems with harmonic vibration if the got into sync with one another, chains would provide a more positive timing control, but would not last as long unless lubricated, as you say. Interesting ideas, I will have to ponder this concept for a while, thanks for helping me keep the gray matter working! :)
You do realize the sync of the engines would be in constant flux due to clutch or belt slip and when each engine was started. That's something which could be partially absorbed by rubber engine mounts. Guessing it would be rather random most of the time so the exhaust note would change. Still in all, the total power would be available at the end of the shared driveshaft.
Just bored, or to you have a purpose for this thing?
i always wanted to build a 4wd go cart. each wheel would be powered by an 8 hp briggs with a clutch from an auto a/c on each hub. most older auto a'c units needed about 7 hp to run so it think they would hold up. with about 30 real hp the power to weight ratio would rival most super cars if the cart was 200 lbs.
And the point;;;;is what?
For science!
RoboticsNShenanigans This is not science.
I really wish that millennials would stop calling any use of technology "science."
Well actually it is science, the guy thought of something, formed a hypothesis, and did the experiment. We can see the results for ourselves.
Shits and grins and bragging rights. What more do you need?
If you have to ask then you wouldn't understand why he built it
The fuel tank needs to be higher. The specific gravity fuel needs more pressure to overcome the "friction" of the fuel hose. A larger tank would add more pressure too or the fuel pump Part #808656 would help too. Great job!
Thanks for the advice, I thought the small tank was somewhat low for this application.
You know what'll be cool, 4 Predator V-twin engines to make a V-8. They will all have independent carbs, so no real unequal A/F ratio's to each cylinder. They will all have their own independent oil cooling systems which could be plumbed together running a big fanned oil cooler at the front. You could make two mint exhaust manifolds running straight piped.
Hmmm, i like your thinking, too bad I didn't have some of those motors! I can almost hear that thing singing a sweet sound in the neighborhood, with no mufflers! :)
I like how I can hear the distinct exhaust note of a 6 cylinder from it
There is a better vid of the 6 running, this is actually the worst vid, as it had spark timing retard happening! I fixed that, then it would rev over 3000 happily, it was really struggling in this vid. I had worked on it for a number of weeks to get this initial run, so I uploaded this vid.
Looks like the 3 engines furtherest away from the starter were running lean or low in time according to the exhaust. Get you an Infared Thermometer and check all of the exhaust to see if the engines are running really close in temperature. Something is going on there somewhere.
Cool idea tho thanks for the video.
It appears that just the three front engines were running. Only their mufflers were colored by heat. The fourth engine had some heat discoloration but not like the first three. It may have been running only part of the time. Mufflers on #5 and 6 had no discoloration at all.
You are correct only 4 cylinder are running on this first run. I have other vids where it sounds just like a 6 cylinder. I posted this vid because of how many hours of work it took just to get it to running condition. Then came the fine tuning :) I remember it was a HOT summer that year, and I had to drill 24 holes thru the steel channels the mount the 6 engines, a broke a number of drill bits also, fun times! I still have all of the engines I used for this and the 8 cylinder. I don't throw any of my FrankenBriggs engines away.
I like its satisfying 6 cylinder sound.
It sounds OK in this vid, but better in the final run vid, since it was only firing on 4 cylinders in this vid (I found that out later).
Very cool!I agree your intake is not ideal. You should add another carb so that each carb feeds 2 cylinders. I think it would be easier to make a good intake that way. Good luck with your project and your others
Yes the crank can wind up and snap since winding and unwinding happens at the same time on extreme ends and meets at node in the middle somewhere....this is the most advanced physics problem and is an art...Finite element analysis today can model this pretty well for design and build. Check out formula one engine design...years ago the Brits tried to stack two flat six engines together into one gear...which was destroyed at can exact rpm because of harmonic vibrations. שלום
Yes, those pesky crankshaft vibrations have caused me grief at least five times now! On the 8 cylinder inline engine, when we revved it to 5000 rpm a few times, it eventually broke the powdered metal crankshaft gear in cylinder #5 (luckily the engine is salvagable). I also broke a crank gear on the 3 cylinder Radial Stacker engine. My five cylinder inline seemed to want to vibrate a lot, and unscrewed the nut on the front flywheel twice, as well as vibrating the whole engine assembly sideways while running. I use 1,3,5,2,4 firing order on it, though I noticed no engine manufacturer has used that firing order. I did it since I have 2 carbs, and I wanted to equalize the fuel distribution as best I could. I had major coupler problems on my inline 4 cylinder, until Lovejoy corp. donated some couplings to me to try, which worked fine. Finally, my Jumo 205 type opposed piston 2 stroke only ran 5 seconds before it broke the flywheel keys and shut off the igniton. I am aware of the crankshaft flex and vibrations, but complicated math isn't my forte, so I just experiment and hope for the best.
i have heard of the flat H 12 formula engine, as well as a 4 cylinder design that had to be dropped due to crankshaft harmonics. I have read a good article about the serious problems 18 cylinder radial engines have with harmonics, and how hard it was to overcome them. Thanks for your input and interest.
congratulations, it's alive!
Yes, it has finally came to life!
Zeppelin in the background, some Northern Ontario folk of my Generation.
Awesome, I would think there is a ton of torque. Very kool.
Thanks for watching.
looks like one of them is firing out the intake, but its a really nice contraption! thanks a lot!
Yes, something is going on there causing backfiring, I am looking into that.
awesome work, cant wait to see it finsished
I did pretty much finish it, if you search around in my vids, you will see the final run vid of the 6 cylinder, as well as an 8 cylinder i made a few weeks later. Both engines run much better than on this vid.
Perhaps offsetting the cylinders by 72 degrees on axis would create uniform power. Each successive power stroke adding to the next, easier starting, but more stress on the starter.
I used 72 deg. on the 5 cylinder engine to achieve even firing (though perhaps it was actually twice that). Anyway, the 6 runs better in my final vid, but the 5 was one unlucky Witch!
FANTASTIC CM,,
Oh my ,,, I can just see it now,, *Herman Munster's Go Kart* up next !!
Great job fella,,
I suggest you go to a three carb setup to shorten and equalize the intake distance. This should fix most of the problems you were having.
Might not be perfect or remotely practical, but it sure does sound great.
It sounds better on the last vid of it I made, I think it is called the final run. I also made an 8 cylinder, and ran it once with no mufflers for a vid :)
Its cool but I feel its going to overheat without the fan cowls on.
Also leaving the factory carbs on and building a multi throttle cable would allow you to adjust each motor individually. Its not the most scientific method, but using a infrared thermometer to check exhaust temp of each engine can give you an idea of which motors are working too hard and which ones aren't working hard enough. Then make your adjustments accordingly.
Only 4 of the 6 engines are running. Look at the muffler paint. The last 2 werent touched, the first 4 paint burned off. Number 4 barely firing, but still got hot enough to burn the paint off.
You are correct, I made 2 later vids where all of them run, but this one gets all of the views.
Third engine in was running lean as hell. Started smoking and the exhaust pipe changed color - only caused by extremely high heat, caused by a lean condition.
i think you wil have better results using 6 carbs vs 2, due to the difference of runner lengths between the cylinders
It’s going to overheat. But pretty cool anyway. The 5 blocks need fans and shrouds, if run under load
Yes, I fully agree, i ran it for 2 or 3 minutes on another vid with 2 large fans blowing on it. i only intended it for short runs when i built it.
It has far to small flywheel (for nice and slooow idling),
and a change of the manifold too, would put this 0.900L. engine to a dream...
I like it.!
I didn't catch whether it had a common crank and cam, or if they are individually housed and linked. That flex would certainly place a lot of stress on the bottom end.
glen atkinson he just coupled them together fucking waste of time useless
You just say that because you're jealous. Why don't you go build the perfect one to show us how it's done? .......we're waiting.
Atta boy! Steve Briggs would be proud of you, if he were still around today.
Thanks, glad you understand why i built this, mainly to see if I was up to the challenge. i know it will overheat in a few minutes, and the intake manifolds are no where near ideal, but hey, it runs :)
That is an awesome setup right there! Never saw anything like it before! Have you got it tuned right yet?
Yes, I have a final run vid of it were it runs much better than here, I also ran an 8 cylinder.
Your wife should have come first on your list
Love the project
It looks like #5 didn't run much, if at all, and #6 ran very little. Their mufflers didn't become discolored, like the others.
The coloring doesn't quite tell the whole tale, as some of the cylinders seem to run lean, heating thtat muffler up more. I did take temp readings, which is how I found out certain cylinders weren't working very well. Eventually I got them all going.
maybe 3 carbs so each intake runner is equal length and all cylinders would get equal fuel and air? the cranks were somehow welded together i'm guessing at 60 degree intervals?looks like a lot of fun
Yes, I bet it would work better with 3 carbs, i used chain couplings to tie the cranks together.
Sounds like 6....Nice job!
In engineering designing crankshafts are the most complex since difficult equations are needed to solve second order torsional vibrations and where the "nodes" ( high shear stress points) occur on shaft.
Firing order and balancing components along with a torsional damper takes much of this stress away. Large diesels have liquid filled or rubber cushioned front dampers. Maybe make a small one off a 4cyl car engine fit this .
Good idea, perhaps that is what the 5 cylinder Briggs I made required, since it unscrewed the front flywheel nut twice. It resulted in the flywheel racing acrossed my lawn once, talk about excitement!!!
What about the cooling for the other five motors ? They are air cooled, by the air the flywheel creates and blows with the aid of the shroud. Only one has flywheel and fan shroud !
Not much for longevity !
Good project, just a humble suggestion, I think the 90 degree elbows in the intake manifold are killing the project, try using one carburetor per each two engines with the carb in the middle of the Tee intake, or try replacing the elbows on each of the first and third engine with two 45 degrees, and check the difference.
One big thing that will help eliminate the backfiring is that since these are hard coupled, try to time the engines at different stroke positions to balance the power and try eliminating the back firing. Ej: each engine 60 degree difference.
When you manage to make it run, you have to find a way to cool engines 2-6 since you took away the cooling fan.
Thanks for the suggestions, the backfiring on this vid was caused by the camshafts being out of time on #4 and 5 cylinders. I made 2 later vids after i straightened out all the bugs.
seems with out the same distance from carb to engine on the intake pipe would cause a mess of fuel flow issues to the cylinder
Yes, I am sure it does cause some issues, though real straight 6 engines often used a single carb., and they ran reasonably well.
I ran a 1969 Rambler with the small straight 6. It had a single 1 barrel carb. It would do over 100 mph without any problems.
Super cool.. Might have been running on 5? Cylinder 5's exhaust didn't seem to discolour with heat like the others
Yes, I noticed that, 5 minutes after I shut it down I touched all the heads, 4 and 5 were hardly even warm, though I did see 4 firing some times in the vid.
Most amusing, well done.
Thanks, check out the Straight 8 vids, it runs better than this one.
took a while but finally saw the distributor. looks like fuel supply is gravity fed; any plans for a fuel pump ? would it be better to feed the fuel from the center point of the carbs instead of chaining the carbs together feeding one first and then the other ? What is the firing order ? Is it a single points distributor or dual point or all electronic ? Did not see a distributor spark advance on the distributor; any plans or need for one? Any plans to try a 'shaped' intake manifold tube for the center intake feeds to match the other tubes ? Don't know what you are up to with doing this but it is very good Tinkering !
Seriously leaned out cylinders ... check the cooking of those mufflers. Would like to see where you are at with the motor today. Sounds pretty nice when it was running!
You are right on the money, retarded spark timing is also a big culprit. I tore this apart, and made a Straight 8 (3 vids here of it running) It worked much better when I solved the problems this one had.
That's a really cool setup!