I was wondering if there are any negative effects caused by advancing the pump timing. Can there be any damage done by it? If not why doesnt the factory bump it up, it definatly makes the truck quicker.
Thanks

 

Advancing the timing will...

Decrease exhaust temperature
Increase cylinder temperatures/pressures
Increase fuel economy (yes, economy is better)
Increase your output of NOx (a pollutant)
Decrease your output of Hydrocarbons (a pollutant)
Increase the amount of black smoke at peak torque

So it is a mixed bag, some things are improved, but hurt from an emissions standpoint.

 

poping the head gasket is about the only negative i can think of.

 

The biggest disadvantage is more pollutants. The only reason the timing is set where it is stock is to meet EPA requirements.
The engine was designed for and actually more efficient with the timing set higher.

 

I'm happy to polute. its like im sticking it to the man for forcing me to run ULSD and lose economy I'd also say the only disadvantage is more cylinder presser and a higher chance to blow a head gasket

 

another negative is it makes the truck slightly harder to start in the cold....

but a little bit of go peddle should take care of this.

 

In addition to what's already been posted, as you advance the timing, you move the peak pressure angle (PPA - the crankshaft angle at which peak firing pressure occurs) closer to TDC at a given RPM. Optimum power/BSFC is generally obtained with a PPA of around 16 to 18 degrees ATC. Because diesel combustion occurs at a relatively constant speed, as the RPMs increase, the PPA will move to the right on a pressure/time diagram (i.e., more and more ATC).

The net result of this is that an engine with advanced timing has to overcome more negative work on the compression stroke at low RPM as the pressure is building sooner as the piston is still traveling upward toward TDC. This is why advancing timing takes away from low RPM performance but can improve high RPM performance.

Rusty

 

nice explanation.

 

Ahhhhhh............You are the man!!!!!!

 

on a more serious note, It can effect cold starts also.