Timing and Compression
Thread Starter
Heel & Toe
Joined: Sep 2009
Posts: 24
Likes: 0
Timing and Compression
I read timing specs and follow them to a T. I set my timing and then check my total timing and it is way out. I am going to replace the distributor because I have already changed the springs and it is still way out. I bought this 1980 Corvette this March I have documents say it has only 17,000 miles on it and it shows like that is true, but I noticed RTV on the oil pan, but no where else. I checked the compression and all cylinders are at 215 lbs. I spoke with a mechanic and he said that seems high for a stock motor. I thought that maybe one of the three previous owners put a cam in it, but there is no RTV on the timing chain cover. When I set the timing and go run the car I have value ping. When I retard the timing I get rid of the ping but I have to retard it a lot. So the car falls on its face at acceleration. Please let me know what you think. Thanks Kevin
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
That is a lot of cranking compression for that motor.
With 215 lbs of compression and a small cam you will have trouble finding a happy spot for your timing. Someone is bound to have changed the cam, or at least advanced the stock one.
With 215 lbs of compression and a small cam you will have trouble finding a happy spot for your timing. Someone is bound to have changed the cam, or at least advanced the stock one.
Race Director
Joined: May 2003
Posts: 10,956
Likes: 409
From: California
something seems wrong.... when mine was stock (L82) 1979, i had a compression of about ~150..... currently running 10.5-1 and static compression is 190.... but static compression also is effected by cam specs... my new cam is about~.55 lift and duration ~240 @50*
hope that helps...
hope that helps...
Thread Starter
Heel & Toe
Joined: Sep 2009
Posts: 24
Likes: 0
The total timing is about 50. This is a L48 numbers matching engine. I pulled all the spark plugs out before I checked the compression. I was told by a mechanic to do that. If there was a cam put in the engine ,it has to be a small one because it has no lope to it.
