Thread: Desmog
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Old 12-13-2010, 12:44 PM
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subzali subzali is offline
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Join Date: Aug 2005
Location: Denver CO
Posts: 8,631

Thanks Ricardo, I'm going to digest this a little at a time. But I want to focus on one statement right here quick:

Originally Posted by RicardoJM View Post
I've run a 78 dizzy (vac retard) with the vacuum ports capped off for a year. There is not anything wrong with running the truck with just mechanical advance; I did notice an improvement once I added ported vacuum (and vacuum advance) - but I got everywhere I was going without it too.
Mechanical advance is just rotating the dizzy to set the nominal advance with the bb on the flywheel right? Right now I have that a little over 7* IIRC. EDIT: the dizzy has built-in mechanical advance based on engine rpm. Vacuum advance gives an additional sensitivity to engine load.

Right now I have the primary vacuum advance can (closer to the dizzy body) hooked up to what is basically the stock emissions hose routing. I think I can play with which advance can I can hook up and which ported vacuum port I hook it to, and as long as I don't have pre-ignition I should be fine. And I think I know what ported vacuum is, but I'm having trouble visualizing which port that is on my carb...

Matt Miller
TLCA# 13684
1977 FJ40 2F "Brahma" + Lockright, tach, Warn 8274, FJ60 Power Steering, no more Sanden OBA (factory emissions), so Puma OBA
1996 FZJ80 1FZ-FE factory lockers + Safari intercooled turbo, Warn M12000, OEM CDL switch, cup holder, and hand throttle, Metric TLC leather, heated seats, JDM switches, Puma OBA
2000 Tundra Limited TRD 2UZ-FE SOLD

Last edited by subzali; 12-16-2010 at 11:41 AM.
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