Question...did you guys ever try adapting a Corvair turbo vac advance/boost retard to a stock distributor?
They worked well and allowed @10 degrees retard.(iirc book said 9-11) My turbo Spyder I ran @24 initial which didnt advance further till @ 4000 then went to 36 degrees by @4500.
By/between 1-2 psi boost It gave a full 10 degrees retard. So basically from 2 psi boost... advance was 14 degrees till 4000 rpm and totaled 26 degrees by 4500. I never checked but would guess vac advance at light load high vacuum would add 10 degrees. Regardless it worked quite well and IMO more reliable way to control boost retard than trusting electronic control. On 99+ octane or better I ran over 20 psi without issue...when pump gas went to hell in the 70's I had to add water injection or find race gas or av gas.(not conveniant for a regular driver). My water injection was a simple boost activated/regulated "spray gun principle" system pre compressor and quite effective.
The Corvair turbo vac/boost canister is not easy to find and kind of pricey these days(Clarks corvair parts) and not just a simple bolt on to a Delco v8 distributor. (point or hei) Doable though.
I do know there are some GM Ford and Mopar apps that had a port on each side of the advance canister. These might be the better alternative as boost applied on the vac advance side would/could allow retard provided the diaphram in the canister can push the arm beyond its static position.
I'm sort of keeping an eye out for one...anyone know of that type cannister on anything, I'll get one and figure out, not just how to mount one, but make it adjustable as well. If there is one where the cannister allows access to the spring and diaghram that would be even better.
Thanks
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