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Old 02-15-2009, 11:55 AM   #13 (permalink)
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Originally Posted by DieselNasty View Post
Needle bearings on a cam? Like your saying the cam rides on needle bearings rather then there normal bearings. There are rollerized cams and roller rockers, but its needed only for high rpm and used in a some of the more powerful trucks. If you want more info call Scheid diesel or Haisley machine and I'm sure you can get what you want.
ya the cam rides on needles and ya ive heard of the drag trucks using them but has any one put them in a daily driver
has anyone ever used a lighter rod in a cummins like a titanium rod
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Old 02-15-2009, 11:56 AM   #14 (permalink)
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Im with you man u just want to do something different, I plan on doin a build making about750 hpjust goin to do it different to.
ya i wanting to make different type of power one that revs like no other with alot less friction in the motor and make it a stroker of possible
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Old 02-15-2009, 01:05 PM   #15 (permalink)
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You do realise your talking about a very VERY expensive project right?


Not sure about putting the cam on needle bearings, never heard of that one before and i dont know if the block would have enough 'meat' to be able to hog out the holes big enough to use a needle bearing.

I think i would leave that part alone, the parastitic loss on the valvetrain is likely very small anyways and theirs no point wasting ALOT of time and money on something that might be a failure.

as far as using roller lifters and roller rockers, thats a fairly simple task, but again going to be an expensive one for just a couple HP. Your going to need a custom made cam to use roller lifters, flat tappet cams are ground with an upside down U type shape to the lobe which reduces friction and keeps the cam from trying to walk around, that shape does not play nice with rollers! For the roller lifters, i dont even know where you would begin to look for those (im sure their is some company somewhere that makes them and sells them for $5000!). The roller rockers can likely be done yourself if your handy in the machine shop.
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Old 02-15-2009, 02:15 PM   #16 (permalink)
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ya i know if you want to see a needle bearing cam look for small block chevys

ya well then i could get a custom cam made to specific specs and it would be on rollers

ive never heard of any one doing this so maybe we are all missing out on something big idk
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Old 02-15-2009, 02:39 PM   #17 (permalink)
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big difference between a 7000rpm SBC with 25% more valvetrain and running 200lb+ valveprings and the lil ol cummins that spins about half the rpm with 25% less valvetrain and 75% less spring pressure (which is what causes your parastitic loss/drag on the cam)

I think your barking up the wrong tree, its alot of money wasted for nothing. comparing a gasser valvetrain to a diesel is in no way comparing apples to apples, a gasser looses ALOT more power in the valvetrain than the cummins ever would. Theirs a reason why you dont see everyone with full roller cummins's, though im sure thair are a few out there, but are likely the guys with $80,000 engines spinning 6000rpm+ and running billet aluminum blocks!
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Old 02-15-2009, 07:49 PM   #18 (permalink)
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big difference between a 7000rpm SBC with 25% more valvetrain and running 200lb+ valveprings and the lil ol cummins that spins about half the rpm with 25% less valvetrain and 75% less spring pressure (which is what causes your parastitic loss/drag on the cam)

I think your barking up the wrong tree, its alot of money wasted for nothing. comparing a gasser valvetrain to a diesel is in no way comparing apples to apples, a gasser looses ALOT more power in the valvetrain than the cummins ever would. Theirs a reason why you dont see everyone with full roller cummins's, though im sure thair are a few out there, but are likely the guys with $80,000 engines spinning 6000rpm+ and running billet aluminum blocks!
im not comparring gassers to diesels at all just wantn to know why no one has tried it in a 700hp truck that they might drive every day or drag race
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Old 02-15-2009, 07:58 PM   #19 (permalink)
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Hamilton Cam's or Hamilton diesel has roller rockers
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Old 02-15-2009, 10:18 PM   #20 (permalink)
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When I talked to PDR or Scheid before they were both talking to me about roller cams an lifters but they are only used for high rpm and very expensive. I never bothered to get a price. If you go in Enterprise Engine Performance website they have pics and prices of roller tip rockers.
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Old 02-15-2009, 11:56 PM   #21 (permalink)
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So much wrong information it makes my head hurt.
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Old 02-16-2009, 12:51 AM   #22 (permalink)
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So much wrong information it makes my head hurt.
Was anything I said wrong or just off the mark?
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Old 02-16-2009, 01:16 AM   #23 (permalink)
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Roller cams have broader lobes than tappet cams. Needle bearings are pointless in a diesel application, bushings are used for billet cams. Valvetrain deflection is more of an issue than weight or friction.

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Old 02-16-2009, 01:43 AM   #24 (permalink)
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i agree with you
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