cam Question
Thread Starter
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Senior User
Joined: Dec 2006
Posts: 130
Likes: 0
From: Panama Illinois
It is a completely rebuilt motor, that has about 10000mi on it. The cam and lifters were changed around 8000
Senior User
Joined: Mar 2008
Posts: 318
Likes: 1
So with the previous cam you didn't have the detonation problem and you've made no other changes, right? Previous cam was the 204/214 @ .050" deal, so something about your new cam or the installation brought the problem. You need to put a degree wheel on the motor and see exactly where the new cam is installed to really know what's going on, or simply take some advance out of it.
Another thing to check is your compression. Do a quick check and see what your pumping pressure is running. Much over 170-180psi at cranking speed is getting pretty high, and the cam advance directly effects that #. More advance = higher pumping pressure = possible detonation issue.
Another thing to check is your compression. Do a quick check and see what your pumping pressure is running. Much over 170-180psi at cranking speed is getting pretty high, and the cam advance directly effects that #. More advance = higher pumping pressure = possible detonation issue.
Thread Starter
|
Senior User
Joined: Dec 2006
Posts: 130
Likes: 0
From: Panama Illinois
So with the previous cam you didn't have the detonation problem and you've made no other changes, right? Previous cam was the 204/214 @ .050" deal, so something about your new cam or the installation brought the problem. You need to put a degree wheel on the motor and see exactly where the new cam is installed to really know what's going on, or simply take some advance out of it.
Another thing to check is your compression. Do a quick check and see what your pumping pressure is running. Much over 170-180psi at cranking speed is getting pretty high, and the cam advance directly effects that #. More advance = higher pumping pressure = possible detonation issue.
Another thing to check is your compression. Do a quick check and see what your pumping pressure is running. Much over 170-180psi at cranking speed is getting pretty high, and the cam advance directly effects that #. More advance = higher pumping pressure = possible detonation issue.
Junior User
Joined: Mar 2005
Posts: 65
Likes: 0
Just my 2 cents may or may not be helpful I have this exact cam in my wrecker tow heavy all the time. I had this problem at first put a performance curve kit in the dizzy and degreed the cam all good now. Here is my build 1.772 comp. ht .189 dished pistons ported d3ve a2a heads .041 thick head gasket stealth intake 750 holley by the way heads are decked .030. After I got figured out this pulls like a freight train and I have no complaints.
Thread Starter
|
Senior User
Joined: Dec 2006
Posts: 130
Likes: 0
From: Panama Illinois
Just my 2 cents may or may not be helpful I have this exact cam in my wrecker tow heavy all the time. I had this problem at first put a performance curve kit in the dizzy and degreed the cam all good now. Here is my build 1.772 comp. ht .189 dished pistons ported d3ve a2a heads .041 thick head gasket stealth intake 750 holley by the way heads are decked .030. After I got figured out this pulls like a freight train and I have no complaints.
Junior User
Joined: Mar 2005
Posts: 65
Likes: 0
I degreed the cam to true 0 which I discovered that 0 on my cloyes true roller was actually about 3 advanced at the cam making the detonation problem more compounded at any rate I got an offset crank key to the correct the timing from PBM performance products
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