Cam options for first gens

[sparks57]

I like PDR, but are there any other options for cams?



Does anyone know about reground cams? I was told that there might be a problem with grinding down the hardened parts of the lobes... is that a problem?

 

[Forrest Nearing]

any decent cam regrinding company will restore the lobe faces to factory spec or better.



Forrest

 

[dpuckett]

Try Diesel Dynamics. They tout their cams as new, not reground stockers. I know, they may not have one that is 1st Gen specific, but a 12 valve is a 12 valve; it should be an improvement over stock, either way.



Daniel

 

[Forrest Nearing]

agreed, give Keith at DD a call and see what he says.



Forrest

 

[sparks57]

Actually, the DD cam is a reground marine cam... so no matter which way you go, you are getting a reground unit.



I just learned that today.

 

[Joseph Donnelly]

The marine cam seems to have the highest quality material and the hardening is thick enough that it is not cut through on grinding. It also allows the desired profile to be ground easily whereas the other Cummins cams DD tried did not. The marine cam also uses a bolt and press fit to retain the cam gear. The gear has walked off some stock cams that use only the press fit. That is basically why DD settled on the marine cam as the basis for their cam. The only downside is that the cam is expensive to buy (every one is bought new from Cummins).

 

[BushWakr - RIP]

FWIW, you can have a cam ground from a new blank if you want and the cost is commensurate with it... the "over the counter" cams PDR has are good/excellent quality... anything that is doubtful gets filed in the smithrite box...



Bob.

 

[sparks57]

Which one is more aggresive?

 

[BushWakr - RIP]

The early version 12v cams for the 1st gen is a regrind, street/towing/strip/sled design. It is currently the only design for the original rams as far as I am aware... .

The regrind or new blank is for the later 12v's and up. . sorry for the confusion CB'

The 94 up, 12 valves can use either the regrind or a new blank ground to performance spec. which will require flycutting the pistons and so forth...

Did that make sense???



bob.

 

[sparks57]

So is the DD or the Piers cam more aggresive, or are they similair enough that the fact that the Piers cam is way cheaper would cause me to purchase the Piers cam?



Can you say, runon sentance?

 

[nascar mark]

Originally posted by dpuckett

Try Diesel Dynamics. They tout their cams as new, not reground stockers. I know, they may not have one that is 1st Gen specific, but a 12 valve is a 12 valve; it should be an improvement over stock, either way.



Daniel

The 2nd gen camshaft won't work in the 1st gen engine properly. Different lift/duration/overlap. Been there done that.



That might help you decide CB.

 

[sparks57]

You better have your hat on backwards young man!

 

[BushWakr - RIP]

:-laf :-laf :-laf

 

[83 crew cab]

hey Mark Question for you I have every thing but the lines I need to put the p-pump on the 92 eng. would a 94 and up stock cam work if the eng had the p-pump installed just trying to figure out what the diffrance in the cam would be thanks George

 

[dpuckett]

Originally posted by nascar mark

The 2nd gen camshaft won't work in the 1st gen engine properly. Different lift/duration/overlap. Been there done that.



That might help you decide CB.

Shows what I know. So, Mark, what is the difference? Or a betterwording may be, what effect do the differences have from 1st to 2nd Gen? I thought the 12 valve engines were similar in build, just different fuel systems, and slight changes to the cam and flow. Or is similar not close enough? If I were to get a newer head (94+ to replace my cracked one), would I need a new cam to go with it? Or would it not make much difference with a VE pump? Would the 94-98 style head even work? I'm as he!! on this one. Most stuff I can figure out, but you got me all jumbled up now. Thanks a lot !!



Daniel

 

[Timebomb]

If you know what cam specs you want Lunati,Comp,Crane can all grind you a cam. Thats were most of my friends with super stock tractors get theres from, just send yours in to them and they will regrind it. As far as i know i dont think anyone offers a agresive cam other than marine that is not a regrind.

 

[nascar mark]

Originally posted by 83 crew cab

hey Mark Question for you I have every thing but the lines I need to put the p-pump on the 92 eng. would a 94 and up stock cam work if the eng had the p-pump installed just trying to figure out what the diffrance in the cam would be thanks George

Hey George,

Yes, a 94 and up 12v cam will work just fine with your p-pump conversion.

 

[nascar mark]

Originally posted by dpuckett

Shows what I know. So, Mark, what is the difference? Or a betterwording may be, what effect do the differences have from 1st to 2nd Gen? I thought the 12 valve engines were similar in build, just different fuel systems, and slight changes to the cam and flow. Or is similar not close enough? If I were to get a newer head (94+ to replace my cracked one), would I need a new cam to go with it? Or would it not make much difference with a VE pump? Would the 94-98 style head even work? I'm as he!! on this one. Most stuff I can figure out, but you got me all jumbled up now. Thanks a lot !!



Daniel

Hey Daniel,

The difference between the two cams, is position of key way to cam gear, lift, duration and overlap of cam. The 1st gen cam has the most aggressive profile. We tried a 2nd gen cam in my truck just to see what the driving difference would be. The egt's ran hotter and the motor had a metalic knock to it.

The fuel rate of the VE to P7100 is very different.

Keep in mind that the marine cam's are designed to run at or near full govenor speed and not for off idle to cruising speed and back again while driving in traffic.

A 94 or newer head will work just fine on your engine. Most late model 93 trucks already rolled out of the factory with the p-pump head (different casting, little better flow) You can reconize them by the notch removed just above the VE pump and the casting # ending in 00.

 

[83 crew cab]

thanks Mark now all I need a reground cam for the lil and and put hte stock cam out of that eng in the crew cab George

 

[sparks57]

One thing I have heard is that the PDR cam is a push fit design, where the DD cam is a bolt fit design...



I could be wrong... so what is up with that?