CP3 timing

[McRat]

The LML syncronizes the plungers of the pump to the cylinder firing. It has been known for a while that since fuel doesn't compress much, having the injector open during a pulse will shoot in more fuel.

For non-LML's, we know that our CP3 efficiency falls rapidly after 3500 rpm. I bench tested various CP3's at various RPM's and found that pump shoots less and less fuel per rev as you rev higher and higher.

The CP3 is geared is to "fire" 3 pulses per rev, which is 4 injector firings.

Gearing the CP3 to 1.33 to fire 4 events wouldn't be that good of an idea since you'd take a big hit in efficiency at high RPM.

But when running 2 CP3's, you could retard the speed to 2 firing per rev (.66) then put the two pumps out-of-phase 60 deg. This would make 4 pulses per rev, and delay the fade point to ~4700 rpm.

It would take a toothed drive for both the CP3's and a way of indexing the pumps.

Beer thirty, just thinking out loud ...

 

[ChevyDieselLLY]

Not sure if I am on the right page let alone book. But you could almost extend the life of a cp3 by doing this also due to less work it would be doing right?

 

[Magilla]

Sounds like a good theory to me. Lessen the work load by roughly 33% and it would make sense to increase pump life.

Sent from my Droid using Tapatalk

 

[McRat]

Naw, this would be a way of making more HP at high RPM's. Yes, CP3 life would be extended. By timing the pump to the injectors, and underspeeding the pump, you should have more fuel per shot at high RPM where you need it most.

 

[McRat]

Six years ago, I had started playing with spinning the Dmax faster to reduce torque. I still think that's the long term solution to max effort engine life.

But alas, we still need better pistons. As your RPM goes up, so does piston temps.

Dream engine is one that makes 1000rwhp at 4500, but only makes 1200ftlb of torque. This will allow the use of stock connecting rods. Think of a "bolt on" Dmax with 1000HP.

 

[GeneralTJI]

Dream engine is one that makes 1000rwhp at 4500, but only makes 1200ftlb of torque. This will allow the use of stock connecting rods. Think of a "bolt on" Dmax with 1000HP.

Agree 100% That would be awesome.

Driveline should be a little happier this way too.

 

[022500ccsb]

Smart guy at work

The LML syncronizes the plungers of the pump to the cylinder firing. It has been known for a while that since fuel doesn't compress much, having the injector open during a pulse will shoot in more fuel.

For non-LML's, we know that our CP3 efficiency falls rapidly after 3500 rpm. I bench tested various CP3's at various RPM's and found that pump shoots less and less fuel per rev as you rev higher and higher.

The CP3 is geared is to "fire" 3 pulses per rev, which is 4 injector firings.

Gearing the CP3 to 1.33 to fire 4 events wouldn't be that good of an idea since you'd take a big hit in efficiency at high RPM.

But when running 2 CP3's, you could retard the speed to 2 firing per rev (.66) then put the two pumps out-of-phase 60 deg. This would make 4 pulses per rev, and delay the fade point to ~4700 rpm.

It would take a toothed drive for both the CP3's and a way of indexing the pumps.

Beer thirty, just thinking out loud ...

Naw, this would be a way of making more HP at high RPM's. Yes, CP3 life would be extended. By timing the pump to the injectors, and underspeeding the pump, you should have more fuel per shot at high RPM where you need it most.
05-06-2011 05:06 AM

Six years ago, I had started playing with spinning the Dmax faster to reduce torque. I still think that's the long term solution to max effort engine life.

But alas, we still need better pistons. As your RPM goes up, so does piston temps.

Dream engine is one that makes 1000rwhp at 4500, but only makes 1200ftlb of torque. This will allow the use of stock connecting rods. Think of a "bolt on" Dmax with 1000HP.

I have been lurking here for some time to learn from smart people like you and while I don't posses the ability to think at the level you can on this topic I can understand and appreciate the thinking it takes to get there. The time and equipment it takes and the money you must have invested makes me green with envy. The fact that you take the time you do to share that information for free with people like me that really have nothing to offer in return inspires me to try to do the same for people that I may have something to offer to.

Many Thanks Again