Hey folks. I was wondering (again yes I know ha) if you can retard the timing and gain anything. I know on big cat motors I.e. 3406A, B, C, Peak, and E you can and they have a quicker spool up time. You can also sit a cup of coffee on the valve cover and it won't shake the coffee hardly any. Any input?

 

We advance for more top end. Never seen anyone post about going the other way but I can only assume you lose top end.

If you want spool up play with the AFC. That can change spool up

 

We did the same thing on the old NTA and NTC cummins It helped with torque but they still didn't have the low end flat torque the cats have.
Like Smoke said the little B models like some advance. Maybe because they were pretty detuned(Compared to marine and some industrial applications) for the first gens.

Or maybe because they spin twice as fast as the big engines.

 

Yeah never thought about the B being detuned compared to the marine ones. If everything is stock would it be wise to advance it a tiny bit or leave it till I put parts on it?

 

You could go an 1/8" bump and notice some pep.

 

The timing on them is really retarded compared to the industrial and marine applications. You actually have to pull the gear and advance it a tooth to get closer to the marine and industrial timings

 

I just loosened the bolts that hold the pump and was able to turn it about 3/16 " from the stock timing marks. It was one of the first things I did Back in the dark ages. Before message boards.

 

Ya if I'm not mistaken 24* is where the marine motors are set. Stock ve trucks are set around 12* I think.

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Just remember, marine motors are spinning a prop in water. Very little load at low RPMs. Peak torque is at top RPMs.