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I am looking for the cam shaft specs on 01 and up pi camshafts. I am looking for duration on intake and exhaust and lift and duration at .050 lift intake and exhaust.
I am thinking about adding a set of comp camshafts to my blown bird later.

I found these specs at comp cams .com
I am considering the medium cam for 98 and below and the mild cam for 99 and above here are the specs with the 98 and below cam shaft listed first.

intake exhaust [email protected] [email protected] total lift lobe seperation
268 274 230 236 .500 114 degrees

This is the camshaft for the 99 and up

intake exhasut [email protected] Exhuast @.050 total lift lobe seperation
262 266 226 230 .550 113 degrees
 

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My understanding is that all PI cams of whatever year or vehicle type are the same and the PI duration values are the same as the NPI cams, just the lift is different.. and I don't know the numbers...

I believe the LS is 116* on the PI's .. virtually no overlap makes em a pretty good SC cam... no boost lost through the exhaust... however Chadg is running SC with cams that have 111* LS and you can't argue with his numbers....

I may have it wrong though... JL is the guy to ask, he's researched these cams a ton...


Which heads are you running, NPI's or PI's ??? and who worked em??? the reason I ask is that Jim fully massaged my NPI's with all the upgrade hardware, and he told me no more than .525 lift... I couldn't consider the 99 and up compcams at .550.... If you're running PI heads, you should be ok, but if you're running NPI's check the fine print at the bottom of the Compcams product chart... you can't use the 99 and up cams in an NPI head without special accomodations.... I see you're running 99 valvetrains, mayber that'll make a difference...
 

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Discussion Starter #3
I am running totaly stock 2001 PI motor with out head modifications.
I did notice a ridge between my manifold that could cause turbalance in #2 and others. I will eventuily have reneagade port and pollish my heads and port match them to my allen.
 

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I saw your other post and JL is the guy to talk to...

I have spoken to him, and Jim at Renegade, and John at Modular Performance, and Dennis Miles at Compcams at length about all this, 'cause I want to max out N/A, the go SC after I build my bottom end...

The cams I decided to go with for N/A may not work for SC, but who knows, really????

Dennis and John both suggested custom grinding with more LS for SC, closer to the 116 that the PI's have.

But,

Like I said Chadg is running SC with 111* LS way over 400 rwhp....
 

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Here is a little list I have compiled so far, but I've also seen different numbers for the PI Cams, like at one of the cam catalogs out there:

All pre-'99 4.6L engines are Non-PI.

Code:
		In.	Ex.	In. [email protected]"	Ex. [email protected]"	RPM Range
NPI cams	.466"	.466"	184°		196°
PI Cams		.510"	.530"	184°		196°
Comp Cams:
XE262H		.500"	.500"	224°		232°		1200-5200
XE268H		.500"	.500"	230°		236°		1600-5600
XE274H		.500"	.500"	236°		240°		2000-6000
XE262AH		.550"	.550"	226°		230°		1400-5400
XE270AH		.550"	.550"	234°		238°		1800-5800
XE278AH		.550"	.550"	242°		246°		2200-6200

Magnum (my old SB Chevy Cam)
282S		.495"	.495"	236°		236°		2000-6000
 

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I just found these specs on Crower Cams Website:

Code:
		In.	Ex.	In. [email protected]"	Ex. [email protected]"	RPM Range
Stock O.E.M.
factory specs	.505"	.533"	184°		192°		Stock		246°/250° [email protected]"	114 Lobe Separation Angle
(1998-up)
There was one other cam site I found, but forgot to bookmark which had yet another set of numbers for the PI cams.
 

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I thought the PI cams started in '99 and up... that chart says '98 and up... weren't the mustangs still NPI in '98????
 

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The second chart from Crower says 98 and up. The first chart says 99 and up. Since your a year older now you may need to update that eyeglass prescription. I used to work in the field and still know people that can hook you up.;) (JOKE!)
 

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I guess I should have been a little more specific.. I was referring to the second chart only, which seems to be bogus, 'cause "98 and up" makes no sense if the cams changed to PI in '99, 'cause in that case, the "98" cams would be completely different from the "and up" cams....

And in a perhaps sly way hinting that we need to be careful where we get our info from .....
 

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Sly you are bud!

One would hope that a company as big as Crower would have their facts straight. Typo that some proof reader probably over looked. That person probably needs glasses!

My day is coming. After 6 years on working on this computer, I am sure my time will be soon, and I ain't no spring chicken either...:(
 

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It will catch up with you Cam.....after all I got my first pair of bifocals this year ;)
 

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I don't know the way I look at it now I can afford to do things to the car that i couldn't have when I was a kid :cool:
Now that I'm older I'm convinced guys who buy sports cars when they get to be our age have really always wanted one and can now afford it rather than being some "midlife crisis" thing
 

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I've had hot cars and sports cars young and "old" ... For me it's not a "mid-life" thing or a longing for my youth thing.. it's a once a car guy, always a car guy thing... and it's fun..

And Timb, your right, I've always wanted a cammed up car with headers, and now I have the resources to do it...

But it appears we've strayed a bit off topic

How 'bout those Marlins, huh???
 
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