Novice Timing Light Question

[steve meltzer]

I've timed many cars with several different timing lights over the years, but all of them had the base timing BTDC. Now, I've got two 911 cars that have a base timing AFTER TDC. My Innova timing light has the "dial back" feature. So, do I look for 85° (it goes from 0-90)? I'll admit also that i've not looked at the CS pulley...does it have a mark at 5° ATDC? I assume it does have a "0"/TDC mark. Yes?? thanx steve

[RDM]

Set the light at 0 and look for the 5 degree ATDC mark on the crank pulley



Image snagged from here:
https://www.pelicanparts.com/techarticles/101_Projects_Porsche_911/23-Timing/23-Timing.htm

[steve meltzer]

thanx so much for the prompt answer. much appreciated. BTW: love petrol blue...had an '80 SC coupe...great car and nearly bought a petrol blue 930. steve

[RDM]

A petrol blue 930 would be hilarious fun!