2.6 puller motor budget build

bigstacks95

bigstacks95

Diesel Doc
Joined
Jul 9, 2008
Messages
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Hey guys... looking for some advice. First complete Cummins engine build although I've done plenty of the typical head gasket and bolt on stuff on all the Cummins motors.

Anyways.... I have a 97 International casting Cummins motor I am freshing up. All apart right now and everything on the bottom end is in spec. I have access to a good lathe and mill so I was planning on fly cutting my own pistons and modifying the bowl. I was curious if anyone has some recommendations on bowl size or design. Not sure what I am running for injectors yet, though I have a set of 8x.010's kicking around I picked up used from Contagious a long time ago. Not sure on the angle, but I could always sell those and go another route.

So my main question is, what should I be doing with my pistons? Just remove the lip? Don't touch them? What kind of compression ratio would I be looking at with the lip removed?

Any advice with my build is appreciated. Trying to do things on a budget....
 
Delipping the bowl to 62mm only knocks off ~ 0.5cc, very good option. Flycutting would depend on the cam, but again I wise choice. I wouldn't waste my time with the 8x0.010" nozzle.
 
Thank you! whats a typical flycut depth? I remember reading something like .070 somewhere? Is that right? And what kind of compression ratio would I be looking at with that?

I was thinking about the Colt stage 5 cam, which is 199*/218*. I will eventually call them and pick their brains and see what they recommend for a fly cut.
 
There is no typical fly cut, it all depends on the camshaft. If the depth was known, a good estimate on the compression ration could be determined.
 
I just talked to Colt. They say usually about .075 on a fly cut. Any idea on a compression ratio?
 
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