Distributor timing

[thomaslee]

My 69 -912 Porsche came originally with a Vacuum advance Bosch Distributor (061)
It was 'upgraded' along the way to a Mechanical Bosch (031) - which changed the timing mark - way off the 'set' marks on the case. This I guess is expected, with a different 'aftermarket' distributor in place.
I've bought yet another Bosch (050) (because it will accept a Petronix Elec. ignition pick up, and the 031 will not). And I am sure my Timing marks - will now be in another different place.

Question is - How does one know where to set the timing ? (there are no set instructions - like 28 degrees or anything. Simply set it to what sounds good ??- with idle and acceleration - "sounding" good? I know too far advanced and too retarded will cause heat problems etc. --- or just take the Distrubitor in the box, and the car to 'The Shop" - then mark the timing spot - when I get it back, for future reference. But then - there would go the fun....

[69 Soft Targa]

You need to measure the degrees on the crankshaft pulley and file marks at 30 and 35 degrees. Sorry I can't supply the measurements or formula to calculate degrees right now. I'll try to get back to you.

If you set the static timing at about 1/4" to the right of the OT mark on the pulley you will be close.

[ron69912t]

Suggest you use a powered timing light and set your mechanical advance 050 didtributor to 3 degrees BTDC. I run my 69 at this advance and never have a problem with overheating or otherwise.

Good luck!

[Duke]

The 050 should be set at 5BTDC. This is the setting I have used for many years with no problems. It will give you the best performance. Get a "Sears Magic Dial" timing light, set the static timing at 5BTDC & 33BTDC @ 3000rpm. Duke, 69 912.