Compression Check
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Joined: Mar 2002
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Compression Check
Recently Swapped a 300 to a 302. Done a compression check and the psi varies from around 100 to 120 dry. Done a wet test and the psi jumps up to around 150/160. How big of a job is it to replace the rings in my 1981 carburated 302 and what else might I have to repair. Should I also change the mains and rod bearings. Will I have to hone down the cylinder walls. And can I do all this work myself. I am what you call a backyard mechanic. The 1981 302 only as 60000 km on it.
Any help would be appreciated.
Any help would be appreciated.
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Joined: Jan 2001
Posts: 56,997
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From: Virginia
Compression Check
Go buy the book "How to rebuild your small block Ford". It will tell you everything you need to know. When you take it apart, you can eyeball the ridge at the top of the cylinders, if there is one. If it is small, you can ridge ream and hone the cylinders and re-ring. If the ridge is deep, it should be bored and oversize pistons installed. Go buy the book. It explains all this and will give you lots of confidence when you go to do it. And you will also be better informed when you take stuff to the machine shop.
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Joined: Jan 2008
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Compression Check
I can't believe you're worried about the compression values at 150-160.
The compression pressure on that engine new would be around 140-150 psi
[i][font color=blue]Dennis[/font][i]
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The compression pressure on that engine new would be around 140-150 psi
[i][font color=blue]Dennis[/font][i]
[font color=red]Calgary,Alberta,Canada[/font]
http://www.clubfte.com/users/mil1ion/Minimorleytruck.JPG
[i][font color=green]
http://www.clubfte.com/users/mil1ion/Mil1ion.html [/font][i]
[font color =green] Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's" [/font]
[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V
84 Volvo DL Wagon [/font]
