10/5/Z1/29 Timing

[Capt Bob]

Current timing set up on my 930 is as follows with the vacuum line connected:

5 deg flywheel mark is lining up with the notch car warmed up to 200 deg F and running smoothly @900 RMP.

29 deg flywheel mark lines up with the notch car warmed up to 200 deg F and running the RPM @4,000 RPM.

I have attached the photo to show the timing markings on my 930.

On a test drive, the car performed well...boost up to 1.2 bar no hesitation at all.

Thoughts...

[T77911S]

1.2 bar. that's a lot of boost.
I saw you said you don't know where your AFRs are, that's asking for an engine rebuild.
stock CIS?
what year?

you are probably safer setting the timing the way you are doing it as I think if you remove the vac line and set it to 29 you will have more advance. (on boost too).
I take it you also have the retard connected.

[Capt Bob]

My distributor has only vac advance connection.

I certainly do not want to ask for an engine rebuild...I do not run up to 1.2 bar often...just as needed from time to time.

Stock CIS, 1982 930.

Bob

[T77911S]

stock CIS, 1.2 bar. still a very bad idea even "not very often". at the least you will break rings

aren't those silver coils known to be a problem?

[1979-930]

How are you measuring that 1.2 BAR? The factory gauge reads high. At least mine does.

[Capt Bob]

The clock has been removed from my 930 so I compare the factory and the secondary boost gauges up to 1 bar and they are close. I have not had the secondary calibrated however I'm assuming they are fairly accurate.

[Capt Bob]

Regarding the silver coil, yes it was bad and I replaced that last week with a SC010 coil.