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Jim2 Jim2 is offline
7.0:1 > 11.3:1
Join Date: Oct 2003
Location: Calgary
Posts: 1,866
Sorry for confusing you two, Spuggy and Eric. Serves me right for posting a reply at 1:30 AM.

Hi Nathan, yes it's vacuum Retard, unlike most other cars. Near the beginning of this thread someone mentions it's an emission bandaid. From Spuggy's post quoting info from a factory manual:

"At idle, the intake vacuum produces ignition retard, which is eliminated when the throttle is opened slightly."

So as soon as you crack the throttle the vacuum retard diminishes. Static timing at idle for my model was 5 degrees ATDC which changes to 19 degrees BTDC as soon as you crack the throttle. When the mechanical is maxed out at 3500 rpm it adds 9 degrees advance for a total of 29 BTDC. Boost retard take 9 degrees back out for a total of 20 BTDC.

Hope this makes sense.

My car is (was) a two port dashpot, but I'm unsure if it was a CA model. Doc shows Oklahoma origin. What year did they introduce standards specific to CA?
Old 09-12-2007, 05:47 PM
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