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roxanne68 roxanne68 is offline
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Join Date: Aug 2005
Location: New Brighton, Minnesota
Posts: 37
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heliolps2: thanks for digging out the vacuum diagrams, ill follow up with the P/N's for the distributor. generally speaking, I think running w/o the vacuum retard should only help matters, as typically lack of advance and lean are the two main suspects when it come to high ETG's (Or ultra rich, but that would have other symptoms.

I have confirmed what the timing does under vacuum and boost using a hand pump:

1. front port: under vacuum in the front port (the one that I have been running disconnected) it seems to retard about 10 degrees, under positive pressure nothing.

2. rear port: under vacuum nothing, under pressure it retards about 8 degrees. don't know why it would be less, though it tricky to get accurate readings while performing this test at idle.

It may be worth noting that I don't have thermotime vacuum switch in the system. the distributor, when the vacuum side of the distributor pot was hooked up was plumbed directly to the throttle body
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'81 Euro SC coupe, 79 3.3 930 engine, 930 transaxle, B&B full dual outlet exhaust, 964 intercooler, 964 cams, CIS injection, K27 7006 turbo. '08 Triumph speedtriple. '06 BMW 330xi
Old 10-31-2011, 02:09 AM
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