Competition BIG RPM's

[RacinDuallie]

Just wondering about the big rpm's.

How big on the RPM scale do you go? and what are the benifits that you've seen getting them?

What is the highest anyone has turned these 6cyl. 's before any destruction?

What needs to be beefed to have the big RPM's reliably?

 

[HOSS]

I am way low on the BIG rpm scale but I hit 4,200rpm with ease (not bad for a 24 valve with a VP44). I have seen trucks (one in paticular) hit well over 5,000rpm but I am not allowed to tell anyone about it for fear of death

 

[Timbeaux38]

I am way low on the BIG rpm scale but I hit 4,200rpm with ease (not bad for a 24 valve with a VP44). I have seen trucks (one in paticular) hit well over 5,000rpm but I am not allowed to tell anyone about it for fear of death

wouldnt be a white one would it? :-laf

 

[Twisted Shifter]

wouldnt be a white one would it? :-laf

I think that’s it that I would tell you but I would have to kill you first category.

 

[STRALEY]

6000+

Our truck hit 6000+ out in IRP. I'm not sure if dad said it was while he was going down the track or at the very end when he clutched. At Tampico I saw 5760 with it. But I don't recommend this high since it is tore down right now. I plan to keep it at 5500 and under for the rest of the year.



J

 

[Hohn]

RPM= Ruins People's Motors



Keep that in mind.

 

[Timbeaux38]

Our truck hit 6000+ out in IRP. I'm not sure if dad said it was while he was going down the track or at the very end when he clutched. At Tampico I saw 5760 with it. But I don't recommend this high since it is tore down right now. I plan to keep it at 5500 and under for the rest of the year.



J

Sure did look cool at 6k though!

 

[COMP461]

I turn 6000 RPM’s, but this is not necessary, except on the big end on the track where you grind metal as we call it. I have pulled in the mid 5000 range under power, and it still pulls on the accelerometer, meaning its still making power. I pay attention to detail, on the valve train, and put an acceptable set of springs on the motor. The valve train on a Cummins has good geometry, and this make the job easer. The valve springs I run are about 30 % heaver then what the other guy sells, I run a titanium retainer, and tool steel bead lock keepers.



Hi rpms are very necessary in making usable hp on a Cummins; if you lug the motor it will defiantly spit parts at you. I balance the motor with in a half gram, and use balance the crank, all this is necessary to keep harmonics out of the gear train on the front of the motor , and saves a lot of grief in this area. I know every one will say don’t rev it , and use thew torque it will make , well hp is the only thing I am after , I never get with in a 1000 RPM’s of peak torque , but that’s just my way of running the little truck, to every one that says that is wrong , “ OH WELL “ if you want to come out and run , run it your way ,

The new motor’s rotation assembly is about 2000+ grams lighter, and that is each hole , so I am expecting a motor that will make power right up to the 6000 to 6500 area

 

[Cumminsman]

not to start anything, but scheid's has been running there pulling truck at 6k + for several years. they use heavy springs and titanium keepers as well.

 

[BigBadDodge]

I am only at 4500.



BBD

 

[GIT-R-DONE]

so I am expecting a motor that will make power right up to the 6000 to 6500 area

Do you think this is the limit of the motor for its useable HP ? Can you turn it higher or how high can one turn it for rpm's and still be able to use it.

 

[RacinDuallie]

I turn 6000 RPM’s,
The new motor’s rotation assembly is about 2000+ grams lighter, and that is each hole , so I am expecting a motor that will make power right up to the 6000 to 6500 area

O. k. so I can understand having a presision balance job to stabilize the rotating assembly for a happier engine, but this litening that you speak of sounds extreme!

You have the new block pistons rods and crankshaft now right ? So you must be presently building and/or testing it ?

You also talk of running your program thru a nascar type dyno simulation program for endurance testing of parts right?


Greg, with all the negativity that's always thrown around here- now is the perfect opportunity to put all the naysayers to rest... ..... I have an idea-


Since you are blessed to have all this technology at your hands with all your connections in the racing elite community- why don't you do this- when you have your new litened up Common Rail deal up on the Dyno that would be a great opportunity to record a little Video Footage of said 6500+ RPM C/R engine making a Power Pull on the Dynometer. You don't have to show the H. P. figures, just the RPM scale... ... ... ????

Nothing revealing- just footage of it running 6500+ RPM's...

So how about it? Doesn't sound too far fetched does it?? Doesn't even seem like it would be that hard to do either? I think it would be COOL to see either way... .

 

[COMP461]

I have not as of yet run the new rod piston combination , but the project is progressing , I don’t really have the time or motivation to show all my cards , the proof is in the number on the score board . The numbers I have posted so far are not reprisenitive of the capabilities of the truck even on that day, there are a lot of variables to work out, and if I ever get time to continue track testing. I have of winning internet battles, but only on the track. I have not gone to the little diesel events, because of circumstances beyond the control of any one involved in the program; the only priority is to run NHRA events, and to push for the major demographic opportunities there. The diesel only races are for fun , and don’t contribute to the direction I wish to go in

 

[RacinDuallie]

I have not as of yet run the new rod piston combination , but the project is progressing , I don’t really have the time or motivation to show all my cards , the proof is in the number on the score board . The numbers I have posted so far are not reprisenitive of the capabilities of the truck even on that day, there are a lot of variables to work out, and if I ever get time to continue track testing. I have of winning internet battles, but only on the track. I have not gone to the little diesel events, because of circumstances beyond the control of any one involved in the program; the only priority is to run NHRA events, and to push for the major demographic opportunities there. The diesel only races are for fun , and don’t contribute to the direction I wish to go in

So by showing a video of your piece on a dyno swinging to 6500RPM's would reveal too much? It would show only that what you've been telling us has some truth to it?..... Not looking for cards... ...

What direction are you looking to take? The little diesel only events? The diesel only races are only for fun? How about promotion of diesel power and diesel as the fuel of the future jibber-jabber you've been telling us about?

What gives?

 

[Timbeaux38]

I have not gone to the little diesel events. The diesel only races are for fun , and don’t contribute to the direction I wish to go in

Sorry to take this off topic, but since diesel-only is not the direction you want to go in, why dont you go clog up an NHRA board with your drivel instaed of hanging ouy with us lowly "little diesel" people. IMO the gasser fans that saw your earth shattering run probably were not as impressed as you think, even though you proabaly talked to all of them. Until a diesel puts the whoop on gassers in the same class, you wont get the respect. I can guarantee that everyone at IRP or Mission would have liked to have seen it.

 

[Morse]

What is the "safe" RPM limit for our trucks if they have a stock bottom end??

 

[Piston Slapper]

Our pull truck has seen 5600 on a dyno and would go more(blew a turbo). It has seen low 5's a few times and high to mid 4's many times. Stock bottom end. I suspect it'd turn low 6's. Just don't need it. Without a sled behind you to slow ya down, you just run out of pavement to fast on the street



We still try'n to figure this stuff out too. We got alot of motor, just getting it all lined up together. It's the secrets you never hear on here that seperate the men from the boys. There is alot to say about the little stuff, thats whats hard to figure out! You get up there in the horsepower game and it gets more difficult. Ain't nobody to ask! and those you do, have 15 different answers/suggestions and 14. 5 of those don't work



We still kicking tires though... .

 

[R-N-R]

Comp, I can respect that diesel only is not the direction that you want to go in, but there is no reason to belittle a national event dedicated to diesel performance, attended by a mass of diesel only competitors and fans, and very much TDR orientated at that. Posting your comment on a diesel only forum is not too bright either



I did not think that you could possibly loose any more credibility, I was wrong. But then this forum is "just for fun" to you, eh? It is a shame, you have so much talent and skill to offer, yet you seem to hell bent on snubbing your nose at us.



RD, my apologies for posting off topic.

 

[RacinDuallie]

RD, my apologies for posting off topic.

Not a problem- I fully understand!

 

[GO 4LO]

Our pull truck has seen 5600 on a dyno and would go more(blew a turbo). It has seen low 5's a few times and high to mid 4's many times. Stock bottom end. I suspect it'd turn low 6's. Just don't need it. Without a sled behind you to slow ya down, you just run out of pavement to fast on the street



... .

By stock bottom end, I assume you mean balanced, right? I was under the impression that without balancing, these engines were only good to 4300 or so...

Chris