All-Terrain Lawn Tractor Forum

Like riding lawn tractors through mud, woods, rocks, and snow? Then this is the place for you! Share your ideas, Post your projects and more!
 
Has anyone removed compression release on their lawnmower engines? Lend10PortalHomeFAQSearchMemberlistRegisterLog inDiscordCountdown TimerHas anyone removed compression release on their lawnmower engines? Rend10
Welcome to the All Terrain Lawn Tractor Forum!
2019 Build Off Underway!
2019 Top Tractor Challenge! Aug 17th and 18th! DETAILS HERE!

Share
 

 Has anyone removed compression release on their lawnmower engines?

Go down 
AuthorMessage
motorhead45102
Apprentice
Apprentice


Join date : 2010-03-07
Posts : 244
Forum Rep : 0
Location : Ohio

Has anyone removed compression release on their lawnmower engines? Empty
PostSubject: Has anyone removed compression release on their lawnmower engines?   Has anyone removed compression release on their lawnmower engines? Icon_minitimeTue Apr 27, 2010 9:32 pm

I have a question has anyone removed compression release on their lawnmower engines, ive done it to my 3.5hp briggs, and my freinds 12 hp I/c engine, and before i worked on his engine it would hardly run at all, but i worked on it and i noticed it had compression release, which it was compression releasing the whole time the thing would run, so i ground the valve stem down, just a hair and the valve(intake) closes when the piston goes from BDC to TDC, so it has a whole lot more compression and it actually runs way better, and it seems more powerfull too, maybe cause it has high compression now. idk, but it works and not really any noise either from alittle gap on the valve stem, about a feeler gauge kind of a gap. but i feel sorry for his engine, cause we got these header pipes off of a vtwin engine and he just wants to run straight header, which the pipe isn't all the way near 12 in. and flames shoot out about almost a foot from the pipe, so i think he is going to burn up his engine, but me on the other hand, im using the other header pipe, and im going to put a quad muffler on the pipe so it would get a good sound with having backpressure.
Back to top Go down
Chunk
Master
Master
Chunk

Age : 27
Join date : 2010-02-10
Posts : 779
Forum Rep : 0
Location : Angus, Scotland

Has anyone removed compression release on their lawnmower engines? Empty
PostSubject: Re: Has anyone removed compression release on their lawnmower engines?   Has anyone removed compression release on their lawnmower engines? Icon_minitimeWed Apr 28, 2010 2:47 am

Thats something I want to try on an engine too. And skimming the cylinder head.
Shame he's gonna ruin the thing!
I like your style man, I dont think straight pipes are always the answer. You normally get a much nicer sound with some kind of muffler, plus your motor wont burn up a valve!
Back to top Go down
https://www.youtube.com/csakvids
motorhead45102
Apprentice
Apprentice


Join date : 2010-03-07
Posts : 244
Forum Rep : 0
Location : Ohio

Has anyone removed compression release on their lawnmower engines? Empty
PostSubject: Re: Has anyone removed compression release on their lawnmower engines?   Has anyone removed compression release on their lawnmower engines? Icon_minitimeWed Apr 28, 2010 6:40 am

yup, thats what im after, a good sounding engine without burning it up.
also i started my engine up and forgot i have no oil in it, do you think its fine, i only ran it for maybe 30 secs? idk how long i ran it but it wasn't long i was just seeing how the muffler would sound. well ill say that i didn't run long enough to even remotely warm up, god why did that happen, but i checked her out she seemed ok for that little bit.
Back to top Go down
dangeroustoys56
Grand Master
Grand Master
dangeroustoys56

Age : 48
Join date : 2010-02-10
Posts : 1726
Forum Rep : 0
Location : Florida, USA

Has anyone removed compression release on their lawnmower engines? Empty
PostSubject: Re: Has anyone removed compression release on their lawnmower engines?   Has anyone removed compression release on their lawnmower engines? Icon_minitimeWed Apr 28, 2010 7:00 am

Well, you can run straight pipes- but they haveta be long enough and a couple bends for some back pressure .

The compression release is there to be able to start a high compression motor - i would think itd be harder to start w/o it.

Oddly my lil 5HP briggs toro has a muffler and still shoots a lil bit of flames out ( and muffler glows bright red) and thats all stock- i might do some changing of that setup- sometimes my foot slips and i burn my sneeker....
Back to top Go down
motorhead45102
Apprentice
Apprentice


Join date : 2010-03-07
Posts : 244
Forum Rep : 0
Location : Ohio

Has anyone removed compression release on their lawnmower engines? Empty
PostSubject: Re: Has anyone removed compression release on their lawnmower engines?   Has anyone removed compression release on their lawnmower engines? Icon_minitimeWed Apr 28, 2010 10:35 am

well the engine has mechanical compression release meaning even if the engine was revving 4,000 its still releasing compression, so without the mechanical release it is harder to start, but once started it has more compression, i may just leave my valve train stock cause, it requires alot of battery power to turn the motor over, mean we hooked up my freinds mower on to his car and it was still lacking some juice to crank it over as if it still had compression release, i would like to get a cam with automatic compression release so i can have ease of starting but lots of power once started. anyone know where i could get a cam? also were would i take my head to have it milled. that would give me more compression wouldn't it?
Back to top Go down
Chunk
Master
Master
Chunk

Age : 27
Join date : 2010-02-10
Posts : 779
Forum Rep : 0
Location : Angus, Scotland

Has anyone removed compression release on their lawnmower engines? Empty
PostSubject: Re: Has anyone removed compression release on their lawnmower engines?   Has anyone removed compression release on their lawnmower engines? Icon_minitimeWed Apr 28, 2010 11:25 am

Yup, having the head skimmed = more compression.

Running it with no oil will do it no harm unless it really warms up. I ran mine for about 5 mins with no oil once (forgot there wasnt any) and it was totally fine, still not warm. PLus there's always gonna be a bit of oil left in the cylinder.
Back to top Go down
https://www.youtube.com/csakvids
Sponsored content




Has anyone removed compression release on their lawnmower engines? Empty
PostSubject: Re: Has anyone removed compression release on their lawnmower engines?   Has anyone removed compression release on their lawnmower engines? Icon_minitime

Back to top Go down
 
Has anyone removed compression release on their lawnmower engines?
Back to top 
Page 1 of 1
 Similar topics
-
» Briggs and Stratton didn't get it right, maybe one of you will.
» 15.5hp OHV Compression Issues
» Lawnmower Man rider
» Raising Compression Briggs 12.5 HP
» Tracked Lawn mower

Permissions in this forum:You cannot reply to topics in this forum
All-Terrain Lawn Tractor Forum :: Technical Forum :: Engine Tech :: General Engine Tech-
Jump to: