High compression vs. Intake and exhaust timing explained!

Поділитися
Вставка

КОМЕНТАРІ • 72

  • @kens.3729
    @kens.3729 4 роки тому +7

    Thank GOD for Power Saws. The Old Days sure had to be tough without the Power Saws. 👍

  • @ozdatman
    @ozdatman 4 роки тому +2

    Hello from Tasmania. Stumbled across your channel last week, great stuff. I only own a 460 rancher as the professional series saws down here are stupidly priced. A second hand 372xp probably goes for around $1000. I have a handful of older saws, mainly chinese and a 30 y.o. Poulan that I thought I may as well experiment on. It's nice to hear someone with experience telling new comers to just have a go. I'm a qualified mechanic with a ruined back, so working on smaller stuff would satisfy my engine lust, although 2 stroke seems like voodoo. Thanks again.

  • @chuck805
    @chuck805 4 роки тому +1

    Uncle Harv! Another video? Awww jeez you really love us. When you said in the beginning when building these high compression saws, bad thing can happen. Like BOOM? I'm not the least bid interested in learning about this topic, but who knows? Thanks for all you do for us. Be safe.

  • @tazman-kennyfuller
    @tazman-kennyfuller 4 роки тому +1

    Love it brother. I'm no mechanic but I sure am having fun playing with different stuff on mufflers. Between you and Buckin I have gotten better at experimenting with different stuff on saws, filing ,mufflers and also fixing things I messed up in the process. Thank you sir. 🌲❤🌲✊

  • @dshurak827
    @dshurak827 4 роки тому +5

    Looking forward to this Harvey.

  • @G-PA-2795
    @G-PA-2795 4 роки тому +1

    It's like Christmas, can't wait to open the next video! Thanks Harvey

  • @ludvigrognli9439
    @ludvigrognli9439 Рік тому +1

    Hi. I am a farmer from North Norway. I thank you fore the greate videos you post on youtube, and impressed of your knowhow aboute Husqvarna chainsaws.The most of chainsaw here is 40-45 ccm chaisaws. This is enough fore firewood as is the most common use here. In USA everything is bigger, but can you make a youtube video of this smaller chaisaws that I refere too?

  • @jonathansiliskie6159
    @jonathansiliskie6159 4 роки тому +2

    Lol, that ole blue saw sure is putting up a fight.

  • @travisweldmaster7815
    @travisweldmaster7815 4 роки тому

    Love you brother, keep it up, always great content

  • @jameswilson322
    @jameswilson322 4 роки тому

    Thank you harvy for the info ,cant wait for the rest

  • @tinmanssaws
    @tinmanssaws 4 роки тому

    Great video Harvey.

  • @benhamilton8132
    @benhamilton8132 4 роки тому

    Thank You for the videos love your channel

  • @robertandreoli9764
    @robertandreoli9764 4 роки тому +2

    Harvey can't wait for this saw to run👍

  • @DaveyBlue32
    @DaveyBlue32 4 роки тому

    Definitely love what you are doing and how you will share anything and that it’s just everybody is in this together and you will share your knowledge and you’re not hiding behind your undeclared magic numbers and those smoke screens!!! You actually explain to guys how these things changing are going to start affecting those things and this is how I came to think this way about that.... there’s no way that a regular chainsaw Macanic that’s just got the chainsaw repair and modify deal could possibly understand your thinking and thinks that you are crazy...your not crazy you are bringing 40 years of experience with all kinds of other engines and machinery that your outside the box thinking has taught you things that those other dudes don’t have any understanding of...and dude I can absolutely remember the crazy back and forth chatter from about 4-5 people because in your first few videos you are absolutely wide open and being totally honest and showing exactly how you basically port a 372 cylinder and you were openly talking numbers and the hidden smokescreen cat’s were saying that guy Harvey is either trying to put everyone out of business or corner the market or whatever and you were really just being you... a great old country boy logger Motörhead 60 year old 390 dirt bike riding badass chainsaw fanatic that was I think kinda talked into sharing some knowledge by Buckin because he definitely thought that there was enough wrong information around and he was trying to get a guy that actually knew what he was talking about because he’d be practicing his craft for 40-50 years??? Hell, man I know that you were working in and around the woods and wherever else you were needed by 10 years old and at 12 or 14 probably driving around the back roads like I was ether getting to a hey field or pulling a wagon down the road!!!! When I saw the video of your engine in the pickup playing in the mud bog.... I know exactly what I was hearing and the guy that assembled that rig knows engines and you also have those 30 plus years of motorcycle engine knowledge and you have worked in an engine building machine shop and you have been tearing into chainsaw’s for thirty plus years too!!! So when you are scratching your head and saying I wish my 372 had an extra carb feeding the crank case through a nice reed valve.... those “other” saw guys are thinking that reed valve is stupid old technology that hasn’t been used since the old days and they don’t even understand how that those older saw’s were more technically advanced in ways more so than the new ones... a set of reed valves allow the engine to reach “numbers” that would be impossible otherwise and if they were actually building for the most power and reliability that there might just be reeds in some modern saw’s. The engine design is all about creating the cheapest power possible and then the EPA’s goal is to try and totally abolish the 2 stroke and diesel powered engines and they are definitely an over-thinking bunch of wankers... a properly tuned 2Stroke engine runs cleaner and they removed the screws and therefore the ability to tune modern engine’s. They spent billions of dollars and all that was needed was a spring national tuneup day at the big boxes and shops and we as a society should be trying to train and teach how to tune properly and instead we are removing the controls and dials and focusing on dumbing down society instead of educating and teaching??? I’m really not a fan of the dumbing down and I’m really not excited about car’s driving around unmanned or not actually having a driver with the 10 and 2 and both eyes on the road type people actually watching what they are doing while they move about the land!!! LMFFAO! Crazy stuff crazy world crazy people and I’m just happy building my chainsaws and chopping wood and growing my garden...simple life!!!👍😁

  • @srankin8022
    @srankin8022 3 роки тому

    I really enjoy your videos. Your knowledge of engine's especially two strokes is amazing. And I really appreciate your willingness to share your knowledge with others.
    There is a misconception that the higher the octane the slower the burn speed and its not exactly true. There are high octane race gas that is really quick burning. Sunoco has a good article on the subject. They have some gas (Cyclone 17 is 117 octane) that is advertised as being really good for two stroke use because they are fast burning.
    Thought you might be interested. Anyway keep up the great work we all appreciate it.

  • @joshuajohnson4396
    @joshuajohnson4396 Рік тому

    Love your videos 📹

  • @fatalfromabove8943
    @fatalfromabove8943 4 роки тому

    Very nice looking Husqvarna 61 there on the work bench!

  • @jorgecosta424
    @jorgecosta424 4 роки тому

    Nice job love it

  • @richr1870
    @richr1870 4 роки тому +1

    Love the info and insight Harvey! I just ported a mac 10-10 using Kensie's numbers and man it's a different saw! Keep the vids coming Harv. I'm going to port a Pro Mac 700 and an 850 also. Got the bug now! Peace my friend.

    • @DaveyBlue32
      @DaveyBlue32 4 роки тому +1

      Kenz’s is a great dude! I love the heart! He’s definitely sharing anything that he knows and learns and I just love that he will not let someone disrespect or talk smack about someone he likes... he’s just one of those guys that if you lived anywhere around him that he would be one of your close friends!

  • @simpleman4224
    @simpleman4224 4 роки тому

    Good stuff buddy! Thanks for sharing!👍👍👍👍🙏🙏🙏🙏🇺🇸🇺🇸🇺🇸🇺🇸

  • @DaveyBlue32
    @DaveyBlue32 4 роки тому +1

    I really dig the old “German?” Dude that has the different wood species plugs with carbides attached to cut new squish bands and a bunch of homemade tooling... he definitely discusses that on the g660’s and other cheaper cylinder’s that you have to cut them down so far to correct their timing that you have to use the JB to raise the intake floor to get your numbers decent and he’s even had the little puff’s of white smoke and then your saw’s not as good but it’s just passed the material.. I’d definitely be ruffing up and texturing the surface to aid adhesion and cleaning it extremely well before applying the epoxy but it’s going to stick if applied properly. The dentist has the g660 and I believe a couple of others that he’s corrected with the epoxy technique... I’m trying to remember the dentist fella who has his own tool kits for chainsaw building and how’s been doing videos for heck like 10 years now??? Um ... Mathew Olson has several good videos that show the epoxy correction technique and he might actually reference the cat that uses the handmade wooden cylinder compression band cutting tools and does a lot of hand work and metal work by hand.. I definitely can’t remember that super cool chainsaw cat but he’s definitely got some informative videos???

  • @theconstitutionalmule9219
    @theconstitutionalmule9219 4 роки тому +2

    I have used that JB Weld high temp on raising the intake on several saws with good luck so for with non coming back to me yet.Try it, you will be happy with the results.Just now finished up poulan 60cc saw with bad numbers on the intake.

    • @DaveyBlue32
      @DaveyBlue32 4 роки тому

      After doing a little research on this idea I really liked the idea that even if it breaks loose that you might see a little puff of smoke as the saw eats it and spits it out.. I guess that it could definitely break something but it’s definitely a way to correct numbers and freeporting issues for cheap... if I were playing with the g660 or something like that I would definitely give it a shot! 👍😁

  • @jensenwilliam5434
    @jensenwilliam5434 2 роки тому

    Thank you!!

  • @timberzach1324
    @timberzach1324 4 роки тому

    Very cool 🤘👍

  • @vintagesawyer6246
    @vintagesawyer6246 3 роки тому

    I used JB weld to repair a leaky dealer installed helicoil on a old boat motor (spark plug threads) many years ago . It lasted a couple of hours before it burned out.

  • @Alan_Hans__
    @Alan_Hans__ 4 роки тому

    Looking forward to seeing some progress with the saw.
    On a side note is there any easy way of measuring the horsepower of a saw?

  • @breadfan2938
    @breadfan2938 4 роки тому +1

    You’re a genuinely humble man Uncle. You’re enthusiastic and willing to share your experience in not only saws, bikes etc, but life in general. Take care Sir. Regards from Australia ✌️

    • @4550andre
      @4550andre 3 роки тому

      Brother We are drinking your knowkeage...I only have courage to mm and gasket dele-te in my stihl 440 and 350 swap 346 cilinder kit 👌🤦‍♂️🥴

  • @jeffreyrubish347
    @jeffreyrubish347 4 роки тому +3

    How much more horsepower do you think you'll have on alky vs a gas saw of that displacement?

  • @kylarobinson3552
    @kylarobinson3552 Рік тому

    3D Printing has come along eats last few years. I'm betting we can use this to our advantage. By printing a jug and using smoke or fog under pressure we could see what exactly is going on in a cylinder and how things are flowing and moving

  • @1944chevytruck
    @1944chevytruck 4 роки тому

    good info thanks!....thanks 4 video. be kind.

  • @terrobelone
    @terrobelone 4 роки тому +1

    Love this!! Quick question Harvey, have you seen any issue with Forged pistons seizing? Chased an issue in my old CR250, stock bore, whet the stock cast piston ran great, forged piston would scuff the exhaust port.

    • @patrickallred850
      @patrickallred850 4 роки тому +1

      It could be the rings.. I know some forged pistons come with chrome rings and some cylinder plating is weaker than the chrome and the chrome breaks it down

  • @ronsilva516
    @ronsilva516 4 роки тому

    A lot of info I will have to watch a couple time s more 👍👍👍👍👍👍😎☕️

  • @indianafirewood7958
    @indianafirewood7958 4 роки тому

    Scored me 2 stihls a 028 super an 036 both run after new gas but 028 someone had taken flywheel nut off an all the bolts an plastic i cant figure out why they took it apart

  • @mrxlh
    @mrxlh 3 роки тому

    Alcohol needing the higher compression, would a surface discharge outboard plug be a better option for this build for better flame front travel? Your already doing a ton of work, so setting you plug gap while machining wouldn’t be much more work.

  • @russellwatkins4261
    @russellwatkins4261 4 роки тому

    This is gonna be interesting

  • @DaveyBlue32
    @DaveyBlue32 4 роки тому

    I’ve been looking at the ports on the 372 for a couple of years and I’ve just recently decided that I’m going to go ahead and just cut the two sides of the transfer port area and just leave the center support and then it can support a little strip of nikasil an help keep the piston a-line in the bore... the lower case pressure has to push a much larger fuel charge though that wide open port than it can up through those closed ports??? I know that tons of people say that these closed transfer ports push a more direct and directed charge to the top of the piston but I’m thinking that we over think everything and a chainsaw cylinder isn’t working like a motorcycle cylinder chainsaw has less pressure to push the fuel charge up through.... the total volume of the fuel charge would be increased by more then double by removing the material that is impeding the air space...!?! The speed of fuel charge moving up through an open transfer is not going to be super impacted by the piston surface movement??? And it’s a 372 cylinder with a piston that’s skirted an not a wide open piston like a Stihl windowed piston....?! I can’t imagine how basically tripling or quadrupling the total transfer ports area in these little basic air pumps...isn’t going to be working more efficiently and moving more fuel and therefore making more power and the bottom end pressure in a chainsaw is pretty low to push through those closed ports and manufacturer’s have used case stuffers to try and increase the pressure to push the charge up through faster and that’s all really seemingly totally over thinking something simple and I’ve experienced the difference in a 357xp/359 set of cases and design and how much stronger it was with more air space through the pump

  • @bluesfreak1700
    @bluesfreak1700 4 роки тому

    Harvey, What ever happened to the ten Holtzforma builds you were going to do? I remember one of your viewers was going to purchase the first and last of the ten.

  • @jerrytucker2412
    @jerrytucker2412 3 роки тому

    Hey mr. Harvey I'm quite a Gearhead myself I think you should get a hold of me and we'll talk about doing something like putting a 390 cylinder and piston on a 372 Husqvarna I think it would be a blast

    • @jerrytucker2412
      @jerrytucker2412 3 роки тому

      And I'm a former logger / still logging but I think that would be a hell of a treat to be able to put that 390 head on a 372 I think I'd be quite a functionable saw with a lot of torque

  • @grantrobbins7791
    @grantrobbins7791 4 роки тому

    What would it cost to port a poulan pro 5020

  • @DaveyBlue32
    @DaveyBlue32 4 роки тому

    How many grams is that piston compared to a regular piston weight??? And I’m confused that if it’s a stock crank with stock counterweight on the crank... then there’s a point of negation on the reduction of the piston weight increasing the power in correlation to the actual balance of the crank shaft assembly from the piston to the counter weight??? The reduction of weight increases the total amount of RPM’s and that increases the power bandwidth on the topend??? The balance of the total intake duration being equal to or ever so slightly less than the exhaust duration is what really ultimately provides the balance of the power stroke that is a “ported” saw??? I’m heading into the world of external and finger porting to add a little bump...
    On the top of the piston I definitely don’t understand why the popup isn’t dished in it’s center to continue and aide the swirling of the fuel charge as it’s being compressed into the combustion chamber????

  • @covidcrotch1960
    @covidcrotch1960 2 місяці тому

    Love the videos. Preparing a 044 046 Hybrid. Oem parts . Have the 044 and the d_shape cc 046 oem head and piston. Splitting the case had a leak starting from the ground up can't wait.

  • @aaronmorgan488
    @aaronmorgan488 4 роки тому

    Harv Use it to find honey spot then do a 2 p head that jb weld melts super fast

  • @chezleymcdonald2481
    @chezleymcdonald2481 4 роки тому

    What about finger ports??

  • @gundysgarage6664
    @gundysgarage6664 4 роки тому +3

    I’ve got myself a old stihl 031, do you think it would be worth doing a mild port job?

  • @evankibbe590
    @evankibbe590 4 роки тому

    Cool beans.
    Very interesting.
    😊💝👍👍🍵☕🌎🌞🍦🍦

  • @timwoodger7896
    @timwoodger7896 4 роки тому

    👍👍✌️

  • @WAVETUBE84
    @WAVETUBE84 4 роки тому +1

    You are exposing your intelligence iH.

  • @timhart2652
    @timhart2652 4 роки тому

    Get it done fast ..lol its going to be fun

  • @pm270100
    @pm270100 4 роки тому

    spray bar like my OS plane motor she old twin port

  • @paytonmac5665
    @paytonmac5665 4 роки тому

    Hello Harvey I thought about oxygenated race fuel like 96 octane

  • @timberray9572
    @timberray9572 4 роки тому

    Mr. Harvey, I have been looking for a good tutorial on how to adjust a carb. If you already have covered this topic could you send me a link to the video? I just rebuilt my first carb on an old 266 and I do have it running good, I just would like to see how you go about it. Thanks.

    • @timberray9572
      @timberray9572 4 роки тому

      @JustaGearHead I did tune it by ear, my 266 runs and has trigger response just like my 272, I am a noob at this and still worry about blowing something up.

    • @patrickallred850
      @patrickallred850 4 роки тому

      Just set the screws at one turn out on each screw and you’ll be fine.. That’s stock settings and it’s safe

    • @timberray9572
      @timberray9572 4 роки тому

      @@patrickallred850 Thanks, I will be spending a little more time with my saw today, yesterday was getting late and I didnt want to piss off my neighbours too bad.

  • @closertothetruth9209
    @closertothetruth9209 3 роки тому

    interesting But I'm going to have to watch this again and again to let it all sink into my puny brain

  • @marcduclos9789
    @marcduclos9789 4 роки тому

    HT 383 Chevy stocker 380 horse 10 to 1 at 34 degrees 4000 fo nd that 10 degrees no Vacuum advance was a good start. Then the advance springs ended up being color brown dew to the 86 four door dooly 7000lbs is the timing with vac. My daily driver don'ts ha no. So I am a mason with 22 acres in Deerfield NH with at leas 1000 maple taps. I burn wood for the shanty I live in and Maple Syrup.

  • @DaveyBlue32
    @DaveyBlue32 4 роки тому

    I don’t understand how running alcohol is going to be an advantage?

  • @matthewscantland85
    @matthewscantland85 4 роки тому

    Hey Harv I have a idea for a video that I think would be great for the viewers. What if we setup a go fund me account or something similar for a saw that we could watch you build. And you could send it to Buckin.
    If your interested I have a 74cc Dayton with the reed valves that I would donate and cash. I would really love to see this.

  • @skippyjones2077
    @skippyjones2077 4 роки тому

    Hey Harvey 👍

  • @matthewscantland85
    @matthewscantland85 4 роки тому +3

    I want to contribute to this build what can I do

  • @jonbobskunkworks
    @jonbobskunkworks 4 роки тому

    My nitrous saw is still alive and kicking. Nitrous plays very well with alcohol. There is a difference between the instant blast of a NOS fun button and good consistent hp monster. For added smiles NOS is fun.

  • @wildmanturner
    @wildmanturner 2 роки тому

    Can you list your email addresses so I can correspond with a question? Thanks