1967 S Cam distributor recurving

[Rob Pritchard]

Hi,
Following on from a previous post, I am having my Bosch distributor from a 2.4T 1973 recurved to work with 1967 S cams, matched with 90mm cylinders and 10.5:1 high comp pistons, 2.4 crank, ported cylinder heads and a Zenith carb with 34mm venturis, 145 main jets, 60 idle and 185 air jets.
I didn't mention in my earlier post that the S cams were from a 1967. Will the distributor part number 0 231 169 008 work ok with these cams and is it it still the case that the recurve should be set at 28 to 30 degrees BTDC@6000 with no vacuum attached.
Thanks in advance.
Rob.

[Trackrash]

It' s my understanding that all the factory S cams up to '73 are the same.

With single plugs and that CR I would not go over 28 degrees maximum advance. I assume you are eliminating the vacuum advance from the distributor. Even so, you will be on the raged edge using pump gas with single plugs.

[johnsontsui]

yes, you are right

[Rob Pritchard]

Thanks.
So should I be looking to permanently remove the vacuum advance?
I forgot to say, I'm in the UK where there's plenty of hi Octane pump gas available.

[Trackrash]

Not sure why you would want or need a vacuum advance.

[911pcars]

Vacuum advance takes advantage of lean mixtures at part throttle (burn is slower), thus more ignition advance to take advantage; also increases fuel mileage.
At WOT = lower vacuum retards timing (thus no advance) from the vacuum mechanism.

If working properly, does not affect total mechanical (centrifugal) ignition advance.

Sherwood