5,000 RPM Common Rail ?
#1
07-15-2007, 01:43 PM
5,000 RPM Common Rail ?
#2
07-15-2007, 02:37 PM
#3
07-15-2007, 03:58 PM
the 12 valve cummins can turn 5K allready but yeah i'm pretty sure it takes a different cam grind. and i know that this would be pretty much for racing engines only but here's what i've got so far...
1. ECM - would have to have a custom reflash to let the engine turn that fast, then with either a downloader or a box the timing would have to be changed, but since the CR timing is all electronic i dont see why the timing couldnt follow the rpm range seamlessly and maybe even make more power in the lower 1-3K range and in the higher 4-5k range then the old 12 valves do since their timing is mechanical
2. valve springs - i know they would have to be stiffer maybe even doubled up to keep the lifters on the cam shaft at that speed
3. cam shaft - a different grind would be required i'm sure to make any power at that rpm
4. head studs - probaly new studs to keep the head on
5. head gasket - a new gasket to go with the studs
6. head - any other head modifications?
7. internals - would the stock internals handle it?, what are the 12v guys doing to keep their engines together at 5K?
8. CP3 - would the pump handle being spun at that speed?, would it need to be underdriven? what about 2 pumps set up on stages with clutches like ac compressors to turn one off and the other on at a certain rpm?
1. ECM - would have to have a custom reflash to let the engine turn that fast, then with either a downloader or a box the timing would have to be changed, but since the CR timing is all electronic i dont see why the timing couldnt follow the rpm range seamlessly and maybe even make more power in the lower 1-3K range and in the higher 4-5k range then the old 12 valves do since their timing is mechanical
2. valve springs - i know they would have to be stiffer maybe even doubled up to keep the lifters on the cam shaft at that speed
3. cam shaft - a different grind would be required i'm sure to make any power at that rpm
4. head studs - probaly new studs to keep the head on
5. head gasket - a new gasket to go with the studs
6. head - any other head modifications?
7. internals - would the stock internals handle it?, what are the 12v guys doing to keep their engines together at 5K?
8. CP3 - would the pump handle being spun at that speed?, would it need to be underdriven? what about 2 pumps set up on stages with clutches like ac compressors to turn one off and the other on at a certain rpm?
#4
07-15-2007, 05:05 PM
Yep, I think you've got it but we're pretty much looking at a full blown racer at that point. That would be one helluva beast as a daily driver and probably wouldnt be wise to tow with it but it sure would be fun down the 1320. 
The DMax community has just now gotten to the point of building close to 5k RPM engines that live. The question is, how long? Our biggest problem was the rods but now that seems to be corrected. Everyone knows that the Cummins has the better factory rods but swinging bigger slugs is one heck of load. I'm thinkin if I was driving a Cummins at 5K rpm's my bhole would be puckerin. 
The DMax community has just now gotten to the point of building close to 5k RPM engines that live. The question is, how long? Our biggest problem was the rods but now that seems to be corrected. Everyone knows that the Cummins has the better factory rods but swinging bigger slugs is one heck of load. I'm thinkin if I was driving a Cummins at 5K rpm's my bhole would be puckerin.
#5
07-15-2007, 07:37 PM
yeah i belive that by that point it pretty much would be a racer/puller only, but that depends on the cam grind.....if you could get a cam grind that would work all the way thru the rpm range then the electronics could let you street drive the truck, but i dont see there being a cam grind that's gonna offer the best of both worlds. if i was buildin a 5k rpm cr then it would be for a pullin truck, and that's what i brought up the topic for. i know one of these days i'll get a new truck and that i'm not going to get rid of this one when i do. so it will become a dedicated pullin truck at that point
#6
07-16-2007, 11:38 AM
1. ECM - would have to have a custom reflash to let the engine turn that fast, then with either a downloader or a box the timing would have to be changed, but since the CR timing is all electronic i dont see why the timing couldnt follow the rpm range seamlessly and maybe even make more power in the lower 1-3K range and in the higher 4-5k range then the old 12 valves do since their timing is mechanical
Its not just a simple reflash. You have to create new fuel tables for that RPM range and all the RPMs leading up to it. Far as I know, the Cummins ECM contains fuel tables for up to 4k rpms. Now, the aftermarket is still battling with how to unlock those fuel tables and put them into service. Above that you are talking major reprogramming.
I would love to see it happen.
6. head - any other head modifications?
#7
07-16-2007, 08:48 PM
yeah Jason I'd love to see it done too, heck I'd love to do it, but i don't have the resources to make something like this happen, but i know that the knowledge is out there and that eventually someone will do it
on the fuel tables i see what your talking about and yeah that would take a programing genius, but it seems to me that with all these different people making downloaders and boxes which all have different programing that someone could figure out how to carry those tables on further, of course the new cam shaft grind would effect those tables dramatically but I've got a feeling that somebody out there could make it happen
on the head porting and polishing....what are the 12V guys doing to let their engines turn that fast as far as head modifications go?
on the fuel tables i see what your talking about and yeah that would take a programing genius, but it seems to me that with all these different people making downloaders and boxes which all have different programing that someone could figure out how to carry those tables on further, of course the new cam shaft grind would effect those tables dramatically but I've got a feeling that somebody out there could make it happen
on the head porting and polishing....what are the 12V guys doing to let their engines turn that fast as far as head modifications go?
#8
07-16-2007, 08:53 PM
Its not just a simple reflash. You have to create new fuel tables for that RPM range and all the RPMs leading up to it. Far as I know, the Cummins ECM contains fuel tables for up to 4k rpms. Now, the aftermarket is still battling with how to unlock those fuel tables and put them into service. Above that you are talking major reprogramming.
I would love to see it happen.
#10
07-16-2007, 09:00 PM
Maybe one day you too could unlock your fuel and timing tables like the DMax big boys. 
