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#57785 03/16/2006 2:56 AM | Joined: Mar 2006 Posts: 55 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2006 Posts: 55 | would anyone happen to have the spec for the acceptable compression for a 1962 (Biscayne) 235 , my gut feeling is that it's a bit on the low side:
1- 80psi
2- 70psi
3- 65psi
4- 70psi
5- 75psi
6- 75psi
tha engine has been sitting since '85 and only started a few tiimes since , I ran it for about 15 minutes last May. I conducted the compression test dry (ie. without squirting oil into the cylinders)
thanks again | | |
#57786 03/16/2006 3:55 AM | Joined: Apr 2005 Posts: 50 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2005 Posts: 50 | The specs. I have for a '62 235 are...
Compression Pressure:
(at cranking speed with throttle open)
130 psi
Max. Variation between cylinders: 20 psi
Make sure the engine has been warmed up before testing and the starter is cranking at normal speed or else the numbers will be lower than they should be.
Since the engine has been sitting a while you might squirt some Rislone or some light engine oil in the spark plug holes and let it sit a while. The oil should free up the piston rings if they are not seating correctly. Then try the compression test again and see if the numbers do come up.
Adam | | |
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