someone please send me timing curve?
Thread Starter
Drifting
Joined: Dec 2007
Posts: 1,672
Likes: 8
From: Sumter South Carolina
someone please send me timing curve?
I just don't know where to start. I don't have a knock sensor installed and if I did, I would first have to calibrate it. I just need this engine running first reasonably well, then I can start pushing the timing up. I just want a safe timing curve so I can get a base tune on it.
Problem is, I can't find anything from holley that makes sense. They have like max advance in the 38!!!!! That just seems way over what I think seems reasonable. I was thinking more like 34. And truth be told Ive never heard "ping" and I can't tell if I'm hearing something rattling or it is "ping" or detonation.
Here is the engine. It will eventually rev to 7000 but I'm breaking it in so I'm only hitting 6000 every so often. 383 SBC, AFR 210 Competition Port heads with 64cc Chambers. 1.6 Rockers, Cam is 624/607 Gross Lift, Duration @ .020 Lift 280/286, Duration @ .050 250/254, Lobe separation 110. Think the static compression was right at 11:1, pistons are flat top with -5cc reliefs.
Running Holley Commander 950 but will be swapping to a Megasquirt 3 unit once I get the engine broken in. The engine is pulling reasonable, nothing out of this world. Feels like it is around 400 hp, but really havent got much of a tune on it yet.
Right now I have idle at 18, and the following advance set at rpms straight up (Which I know isn't right but I just had to have somehting)
1200 - 20
1600 - 25
2000 - 27
2500 - 29
3000 - 30
3500 - 31
4000 - 32
4500 - 34 and 34 up to 6500
Problem is, I can't find anything from holley that makes sense. They have like max advance in the 38!!!!! That just seems way over what I think seems reasonable. I was thinking more like 34. And truth be told Ive never heard "ping" and I can't tell if I'm hearing something rattling or it is "ping" or detonation.
Here is the engine. It will eventually rev to 7000 but I'm breaking it in so I'm only hitting 6000 every so often. 383 SBC, AFR 210 Competition Port heads with 64cc Chambers. 1.6 Rockers, Cam is 624/607 Gross Lift, Duration @ .020 Lift 280/286, Duration @ .050 250/254, Lobe separation 110. Think the static compression was right at 11:1, pistons are flat top with -5cc reliefs.
Running Holley Commander 950 but will be swapping to a Megasquirt 3 unit once I get the engine broken in. The engine is pulling reasonable, nothing out of this world. Feels like it is around 400 hp, but really havent got much of a tune on it yet.
Right now I have idle at 18, and the following advance set at rpms straight up (Which I know isn't right but I just had to have somehting)
1200 - 20
1600 - 25
2000 - 27
2500 - 29
3000 - 30
3500 - 31
4000 - 32
4500 - 34 and 34 up to 6500
