Re: Re: Re: 95psi good compression

Posted by G-MAN on February 25, 2003 at 10:39:08 from (206.106.139.74):

In Reply to: Re: Re: 95psi good compression posted by MARK TX on February 25, 2003 at 07:51:56:

There is no hard and fast rule for proper compression on a gas engine. It depends on a number of factors - compression ratio, cranking speed, intake restriction and so on. You can't just pick an arbitrary number and say that compression should be at least such and such - you need to get the proper specs for whatever engine you're working on. Case in point - compression psi on a Deere gasoline 3010 should be 160 psi - on a Deere gasoline 2510, it should be 185 psi - and both are measured at 170 rpm cranking speed. Notice the substantial difference. The main thing to look for when checking compression is balance between the cylinders. There really shouldn't be more than about a 10% variance from cylinder to cylinder. An engine with slightly low compression but that has pretty much equal readings on all cylinders will run much better than one with three good cylinders and one that is much lower. I would suggest getting the proper service manual for your tractor and going from there. You're compression may not be as bad as you think it is. If it is low, perform a wet compression check to determine if it's the valves or the rings causing the problem. No sense doing a complete overhaul if a valve grind would cure the problem. Also make sure that your throttle is wide open when checking compression. Not doing so is an easy mistake to make.

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