Pre-detonation when I step on it -
Thread Starter
Teching In
Joined: Jul 2012
Posts: 6
Likes: 0
From: Pacific palisades, ca
Pre-detonation when I step on it - I just bolted in a new, LS 364/440 - it has flat-top pistons with 10.9:1 compression -.500/.500" lift cam, Holley 770 street avenger carb in my 69' Camaro. Brand new, crate motor from GM performance.
With a Trimec 5 speed manual trans, 4th gear on fwy 70 mph is about 3000 rpm, and 5th gear @ 70 mph is about 2000 rpm
Problem is I'm getting pre-detonation when I step on it.
Today, I heard its probably the carb? Someone told me I'm starving it of fuel, and the carb choice was not correct? I don't want to damage the engine, it sure doesn't sound good and I can't be doing it any favors.
Any suggestions and direction would sure be appreciated.
With a Trimec 5 speed manual trans, 4th gear on fwy 70 mph is about 3000 rpm, and 5th gear @ 70 mph is about 2000 rpm
Problem is I'm getting pre-detonation when I step on it.
Today, I heard its probably the carb? Someone told me I'm starving it of fuel, and the carb choice was not correct? I don't want to damage the engine, it sure doesn't sound good and I can't be doing it any favors.
Any suggestions and direction would sure be appreciated.
Is the carb new? It may be a little on the small side. Either way, is your vacuum secondaris working properly? You might try fattening up the secondary circuit a little
Thread Starter
Teching In
Joined: Jul 2012
Posts: 6
Likes: 0
From: Pacific palisades, ca
Detonation may be the term? it sounds like there are nuts and bolts rattling around in the combustion chamber!!
as I'm not a mechanic, although I basically installed the engine, tranny, rack n' pinion steering, and wired the entire car, I don't think I have the knowledge to track this down.
I'm in Los Angeles (South Bay, Near LAX, Santa Monica)
Any recommendations of someone who can look at this for me?
btw, all parts are new...
as I'm not a mechanic, although I basically installed the engine, tranny, rack n' pinion steering, and wired the entire car, I don't think I have the knowledge to track this down.
I'm in Los Angeles (South Bay, Near LAX, Santa Monica)
Any recommendations of someone who can look at this for me?
btw, all parts are new...
