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So who has bumped the power on a 6CTA cummins

Ford Mechanic

Ford Mechanic

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RustyM923 said:
I'd be more worried about the over driven transfercase
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Why??? I thought the transfer case just couldn't handle the reduction of reverse in low? It's not like it's shifting in the t-case under acceleration. What was worrying me was the upshifts, it was really lunging every time it shifted. It hadn't done that before I turned the pump up.

I turned it down a half a turn, I'll see how it runs to marrow. I might just turn up the preboost screws some, what do I need to expect to adjust it? I under stand it's a star wheel in there. Is there something I need to loosen a set screw or somthing?
 
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Vintage iron

Vintage iron

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The Allison transmission in the M939 series trucks can handle the increase in the power. My customer Steve put a 450hp Cummins 400 in his M929 dump truck with 1600's on it. He has been working it for a year now. He did his homework and found that the Allison transmission in our trucks are rated to 425hp.
 
Suprman

Suprman

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I have them listed in the classifieds with dimensions. They were intended to mount above a radiator thats a bit lower than the one on a 5ton. Several commercial diesel trucks use this style. Look at the pics and let me know. will@pawnking.com
Will
 
4XDesign

4XDesign

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Suprman said:
I have them listed in the classifieds with dimensions. They were intended to mount above a radiator thats a bit lower than the one on a 5ton. Several commercial diesel trucks use this style. Look at the pics and let me know. will@pawnking.com
Will
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Okay found them they are definitely big. I will have to pull some more measurements and ill let you know thanks again.
 
hklvette

hklvette

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Vintage iron said:
The Allison transmission in the M939 series trucks can handle the increase in the power. My customer Steve put a 450hp Cummins 400 in his M929 dump truck with 1600's on it. He has been working it for a year now. He did his homework and found that the Allison transmission in our trucks are rated to 425hp.
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Huh? I've seen conflicting reports on what the MT654CR can handle, but the highest I've seen is 300HP/950ft.-lbs. posted here on SS. Do you happen to have a source for the 425hp number?
 
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Strouty

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Jason O said:
For those of you who have installed new GSK's, have you considered using a better harmonic balancer? Only reason is that I remember seeing notes in the parts catalog that the OEM balancer was for 2100 RPM or lower.
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This is a great question, I know when I was looking at increasing the HP on my 3126 (civilian) that one of the requirements was to change the harmonic balancer. I am thinking there must be info available from cummins about this. These engines were in motor homes and those are usually the highest HP ratings.


hklvette said:
Huh? I've seen conflicting reports on what the MT654CR can handle, but the highest I've seen is 300HP/950ft.-lbs. posted here on SS. Do you happen to have a source for the 425hp number?
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I would love to see the spec sheet that says that, it would be nice to know. My guess is that someone was misinformed. I am going to swap in an MD3060P into my M931A2 and that is not rated anywhere near 425HP.
 
Tornadogt

Tornadogt

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Marine engines (as in Boats) have the highest Hp and Torque ratings. They have a unique advantage of an endless supply of cool water for both the innercooler/aftercooler and engine coolant systems.
 
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Moto2four

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I installed an egt gauge on my truck yesterday and had to turn the fuel rate way down. The previous owner had cranked up the fuel, and I was seeing 1400 on moderate acceleration.
 
nevrenufhp

nevrenufhp

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Moto2four said:
I installed an egt gauge on my truck yesterday and had to turn the fuel rate way down. The previous owner had cranked up the fuel, and I was seeing 1400 on moderate acceleration.
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Is there an air flow restriction? Even with the nut backed off, it shouldnt get to even 1300.
 
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