Re-Curving a Smog Motor - Team Camaro Tech
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post #1 of 2 (permalink) Old May 1st, 04, 05:49 PM Thread Starter
Senior Tech
Matt Jones
 
Join Date: Jan 2002
Location: Renton, WA USA
Posts: 2,765
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This is for my '86 Pickup with a smog 350. I just got the Q-Jet dialed in for best performance and miliage, and I'm now moving to the distributor. I'm just going to worry about the mechanical advance for now, and worry about the vacuum later.

I'd like to re-curve it. Currently, it calls for 8* initial, and it equates to a lazy off-the-line response. But when setting up the curve for these low compression, stock cam, emission motors, do you still go for the standard SBC performance curve? By that I mean something like 12-14* initial, and 36* total by ~3000RPM. Would a curve like that maintain fuel miliage and low octane requirements? Or is the stock curve best for performance, fuel economy, and 87 octane fuel? Thanks!

Matt Jones
Lead Mechanical Engineer
Art Morrison Ent. Inc.
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post #2 of 2 (permalink) Old May 2nd, 04, 09:56 AM
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Join Date: Jan 2001
Location: skiatook, ok
Posts: 3,692
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I have always ended up with 12-14 initial, with the lightest springs I could get in there that would keep a steady idle. Those low compression smog motors seem to like a quick curve. I never had any ping problems on 87 octane either.

"This is not a cheerocracy...I make the cheercisions around here"
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