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Jamie B.
MMT 1000 Club
Joined: Tue May 19, 2009 9:48 am
Posts: 2688
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 Compression Difference How much difference is allowed between each cylinder on a 35 briggs? I have one at 195 psi and the other at 165 is there something wrong with this?
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| Tue Feb 09, 2010 2:08 pm |
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caddobrook
MMT F.E.
Joined: Mon Feb 01, 2010 11:01 am
Posts: 881
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Re: Compression Difference My understanding is that you want less than 10% difference between cylinders...
So it sounds like you have a problem to me..
Also, that sounds kind of high.. I thought stock was in the neighborhood of 115psi... Did you mod this motor?
But there are far smarter guys than me on here that can probably tell you a little more and give you some ideas on what to do...
If not, I would call gecker and see what sheldon suggest you do.
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| Tue Feb 09, 2010 2:14 pm |
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Jamie B.
MMT 1000 Club
Joined: Tue May 19, 2009 9:48 am
Posts: 2688
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Re: Compression Difference The motor is modded with high performance cam.
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| Tue Feb 09, 2010 2:15 pm |
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Gator Guy
MMT Pro Member
Joined: Tue Jan 13, 2009 4:53 pm
Posts: 457
Location: Loreauville
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Re: Compression Difference
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| Tue Feb 09, 2010 3:05 pm |
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DMC
MMT Pro Member
Joined: Sun Jan 25, 2009 7:23 pm
Posts: 204
Location: Bayou House!
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Re: Compression Difference Do a leak down test on each cylinder and determine if its a valve, rings, or a head gasket leaking.
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| Tue Feb 09, 2010 6:14 pm |
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Rail
MMT Pro Member
Joined: Tue Jan 13, 2009 9:26 pm
Posts: 302
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Re: Compression Difference Depending on how many hours are on the heads since they were worked and the engine was built, I would lean more to valve guides leaking.. Check for excess carbon build up.. Most head porters that do these engines don't think to replace the guides but they take plenty out around them..
_________________
"I just want silence. Jesus, it doesn't mean I don't like you. It just means right now, I like silence more."
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| Tue Feb 09, 2010 7:40 pm |
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Jamie B.
MMT 1000 Club
Joined: Tue May 19, 2009 9:48 am
Posts: 2688
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Re: Compression Difference Guys thanks for the help sent heads to mechanic I know and valves where leaking. I had 175 hours on the heads since modded.
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| Tue Feb 09, 2010 8:31 pm |
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bjg
MMT F.E.
Joined: Thu Jan 15, 2009 7:34 pm
Posts: 882
Location: Ahead of you, with a rubber band turning my prop!!
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Re: Compression Difference
_________________
BUCK OFAMA
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| Tue Feb 09, 2010 11:16 pm |
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Rail
MMT Pro Member
Joined: Tue Jan 13, 2009 9:26 pm
Posts: 302
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Re: Compression Difference Thanks but I also said depending on hours since build.. Dumbass.. 
_________________
"I just want silence. Jesus, it doesn't mean I don't like you. It just means right now, I like silence more."
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| Wed Feb 10, 2010 2:41 pm |
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bjg
MMT F.E.
Joined: Thu Jan 15, 2009 7:34 pm
Posts: 882
Location: Ahead of you, with a rubber band turning my prop!!
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Re: Compression Difference
_________________
BUCK OFAMA
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| Wed Feb 10, 2010 7:19 pm |
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craig
MMT Elite Member
Joined: Tue Jan 13, 2009 7:53 pm
Posts: 7515
Location: Chauvin
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Re: Compression Difference
_________________
1750 GatorTail Extreme/Stage 3 37 GTR HD
Procrastination is a lot like masturbation. Sure it sounds great at the time but, in the end your only f--k--g yourself.
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| Wed Feb 10, 2010 8:47 pm |
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grrifles
MMT Pro Member
Joined: Mon Jan 19, 2009 3:10 pm
Posts: 72
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Re: Compression Difference Well lets see here if the valve guide wears it will cause the valve to tilt causing the valve to not seat correctly. Especially when a lot of the guide has been removed from porting. But I could be wrong
Chris
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| Wed Feb 10, 2010 8:52 pm |
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bjg
MMT F.E.
Joined: Thu Jan 15, 2009 7:34 pm
Posts: 882
Location: Ahead of you, with a rubber band turning my prop!!
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Re: Compression Difference
_________________
BUCK OFAMA
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| Wed Feb 10, 2010 11:47 pm |
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