compression ratio Ques
Thread Starter
Instructor
Joined: May 2005
Posts: 229
Likes: 0
From: Oreland PA
compression ratio Ques
I rebuilt my 76 L48. Replaced the bearings, rings etc. I left the bottom end alone and kept the stock pistons, rods and all hard parts. I installed a set of 202 heads with a 64cc chamber. How much did this raise my compression ratio. The stock heads are 76cc and I think the original ratio is 8.5 to 1.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
two questions:
- What head gasket came off it? what'd it look like? thin shim steel or thick composition?
- Same gasket question for what you put back on w/ 64cc heads? And do you know p/n of new gasket?
Melting Slicks
Joined: Dec 2006
Posts: 2,669
Likes: 3
From: Kingston Ontario
Thread Starter
Instructor
Joined: May 2005
Posts: 229
Likes: 0
From: Oreland PA
The only thing I can tell you is that it was the stock gasket that came off and probably the same that went back in. I got the gaskets in a Fel Pro set from the auto parts store.
Drifting
Joined: Apr 2002
Posts: 1,716
Likes: 4
From: New Baden Illinois
The one from the Fel-pro set is probably a .041 gasket, which will lower your compression from the stock gasket.
Le Mans Master
Joined: Sep 2001
Posts: 7,739
Likes: 630
From: Unreconstructed, South Carolina
In all reality, OE dished piston L48 was much closer to 7.9:1 scr ... your 64cc heads & gasket KIT head gasket probably pushed it very close to just under 9:1.
Thread Starter
Instructor
Joined: May 2005
Posts: 229
Likes: 0
From: Oreland PA
Thanks for the replies. I am not a mechanic, but I was able to build this with the help of a friend who is. I wish I could have given you more specs. The bottom end is bone stock. I can say the car does run its a** off and is very reliable. I was not looking for a rocket but wanted to be able to run when I needed it.
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Drifting
Joined: Nov 2002
Posts: 1,692
Likes: 209
From: Loveland, CO
Great work. You put a few hours and that cleanup and rebuild.
What is the thickness of you air filter element. It looks very thin, but that could just be the picture angle. It appears the stud holding on the filter lid protrudes above the filter and might allow for a thicker filter. I'm sure you have closed the hood by now and everything clears.
Ralph.
What is the thickness of you air filter element. It looks very thin, but that could just be the picture angle. It appears the stud holding on the filter lid protrudes above the filter and might allow for a thicker filter. I'm sure you have closed the hood by now and everything clears.
Ralph.
Thread Starter
Instructor
Joined: May 2005
Posts: 229
Likes: 0
From: Oreland PA
Great work. You put a few hours and that cleanup and rebuild.
What is the thickness of you air filter element. It looks very thin, but that could just be the picture angle. It appears the stud holding on the filter lid protrudes above the filter and might allow for a thicker filter. I'm sure you have closed the hood by now and everything clears.
Ralph.
What is the thickness of you air filter element. It looks very thin, but that could just be the picture angle. It appears the stud holding on the filter lid protrudes above the filter and might allow for a thicker filter. I'm sure you have closed the hood by now and everything clears.
Ralph.