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Senior Member
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2,063 Posts
Discussion Starter #1
Is there much advantage in running a 6.7 instead of a 5.9? Here is what I have in mind use a 6.7 short block a 24V head a 12V timing case and cam gear a P7100 pump and a set of 8X12 injectors. Will the 6.7 work better than a 5.9? That is not all the parts but you sort of get the picture.
 

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gone fishin!
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2,833 Posts
any time you increase displacement you are gona increase you power output...... the question is will the head and bottom end be able to keep up?
 

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Senior Member
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Discussion Starter #3
I never gave much thought to if a 6.7 bottom end would be strong enough?

I would think it would be?
 

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Senior Member
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2,063 Posts
Discussion Starter #5
Right now I am still collecting parts. Here is what I have and what I think I want.

Have
6.7 short block
24 V head
57/65 turbo for now
P-pump benched at 380 cc
8X12 injectors set for a p pump
I have sent the cam out to be ground. 180/210
This will be going in my 94 with a NV4500

Target HP 500, I want something easy to drive on the street and still tow.
 

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TDG Mafia Goon
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3,710 Posts
It may have been an isolated incident but there's near me that has been through three cranks and pushes just shy of 500 on the rollers.
 

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Senior Member
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2,063 Posts
Discussion Starter #11
Did Cummins change the way they are making the cranks or the material they are made from?

I did hear they had gone to powder metal tech for manufacturing their rods.
 

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Senior Member
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2,063 Posts
Discussion Starter #12
Well I have the 6.7 disassembled and the timing cover from a 12V does not fit, I can modify it to fit but the case also hits a boss on the side of the enging that a 12V does not have. Looks like time to get out the grinder.
 

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Senior Member
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Discussion Starter #14
Ok, would I be better off with 366 as a single or use the 57/65 for a secondary and say 472 under it?
 
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