Mild knock and temperature increase
Thread Starter
Melting Slicks
Joined: Jul 2004
Posts: 3,291
Likes: 8
From: Avon, Indiana
Mild knock and temperature increase
I asked this question as a reply to a thread a few days ago, but I think it got buried. I have an '80 with a 383 and a pretty strong cam. In normal driving, the temp needle is right at 200. There are some long hills where I live, and when climbing the temp rises a little (needle goes to first "0" in "200" and I get a mild engine knock. Sounds like shaking small gravel in a tin can.Seems like a little loss in power.
One mechanic has suggested carb is too lean. Richer = cooler.I read some place, however, that a problem with knock might be because it's already too rich and carbon is causing the knock.Then there's the possibility it's the timing.
What do you think is most likely the problem?
One mechanic has suggested carb is too lean. Richer = cooler.I read some place, however, that a problem with knock might be because it's already too rich and carbon is causing the knock.Then there's the possibility it's the timing.
What do you think is most likely the problem?
Safety Car
Joined: Oct 2004
Posts: 3,725
Likes: 5
From: Minnesota
Originally Posted by big_G
A little too much timing.
If you suspect a carbon buildup problem you could run some Sea foam through the fuel system. No vette should have that problem though.
What octane are you running?
Burning Brakes
Joined: Aug 2005
Posts: 1,126
Likes: 0
From: Hudson Falls, N.Y. 76 Vette Modified L-48
Why not try a tank of 93 oct and see if things improve..gas is cheaper now...at least you won't be re-inventing the wheel that way, ya might just need a little more punch...easy
