how many degrees does the 1/8 timing bump set you at 14.5 or 15? thanks alot!!!!!!

 

Sat down and figured this out one day. And with a little help from some friends, got the numbers fine tuned.

Cummins engine VE pump timing: (unverified)
1.25mm pump lift = 12.5° stock intercooled (1.4mm stock non intercooled)
2.4mm additional pump lift (advance) = 21° - 22°
M&H timing spacer increases to 6.4mm advance = 31° - 32°


1mm pump rotation = 1° timing (verified)
1 tooth on drive gear = 5° timing (verified)

1/8" bump is 4° - 5°

Hope this helps

 

so is it safe to say after 12.5 stock the 1/8 gets u around 14? thanks for taking the time to verify this. what is the M2 timing spacer?

 

1/8" bump puts you at a 16ish-17ish base timing.
The M2 is a fuel pin.
The M&H Dynamic timing device (timing spacer) allows for more total advance. 12.5° to 32°, instead of the stock 12.5° to 22°.

 

So by looking at your math that would put a non-intercooled engine at around 13°? Correct?

 

so if the 1/8 puts you around 16 17ish are we risking a head gasket?

 

Yes, around 13°-14°.

No, quite a few people bump it a lot more and/or jump the gear a tooth. How ever, when you advance the timing you take away from the low RPM end to give to the high RPM end. Your modifications, tuning, and end purpose will determine your best timing. For example, my 91 had the gear jumped a tooth but did not perform as well as I would have liked when towing. So now my base timing is back to stock plus the timing spacer. That gave me my low end back and extended my upper end.

 

Where's a mod? This needs to be a sticky......

 

Crap!

I've got my mess advanced two teeth, with the pump set just a hair past the stock marks. Plus the M&H spacer.

Still tweaking it though.

 

Yes, but your special.