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Discussing Pi Cams vs. NPI cams in the 96-98 Forum. Several of the cars on the MM&FF site run Ported and Polished PI ... Modded Mustangs is the premier Ford Mustang Forum on the internet. We discuss all aspects of the Ford Mustang on the forum. Registered Users do not see the above ads. Please Register - It's Free! |
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September 12th, 2007, 07:15 PM
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#1 |
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Hardcore Enthusiast
1997 Mustang GT
Faster than an s4
Join Date: Aug 2007
Location: Seattle, WA
Posts: 1,315
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Pi Cams vs. NPI cams
Several of the cars on the MM&FF site run Ported and Polished PI heads but run after market NPI cams. Does anyone know why?
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September 12th, 2007, 07:19 PM
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#2 |
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All Throttle with a Bottle
1996 Mustang GT
10.76 @ 122 with d/a of 8365 ft
Join Date: Dec 2006
Location: Lakewood, CO
Posts: 8,131
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Because its MM&FF
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 1996 Mustang GT with a 351 swap with Stalled C4 1997 F250 Powerstroke 1999 28' Classic Dominator Special Thanks to: Andrews Racing Transmissions & Thanks for the help: PoorManMotorSports "Just Cause its Smoking, don't mean its broken" |
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September 12th, 2007, 07:34 PM
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#3 |
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Hardcore Enthusiast
1997 Mustang GT
Faster than an s4
Join Date: Aug 2007
Location: Seattle, WA
Posts: 1,315
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But is there any real reason. I heard it has to do with longer duration. I guess thats possible but I would think that an after market cam would have the longest duration they could get anyways along with the larger lobe size. But I don't know.
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September 12th, 2007, 08:20 PM
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#4 |
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Enthusiast
Join Date: Oct 2006
Location: warren, Mi
Posts: 941
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<<<<<From a headporters view ; the air speed stalls on the P.I head around .500" lift (.480" to be exact). Taking the lift beyond that in some cases will cause a lose of power depending on the combo. Every combo requires a different cam to see peak potenetial....
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Just another 10 second Mustang, what did you expect ? http://youtube.com/watch?v=BgykaUrmfvM
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September 13th, 2007, 12:11 AM
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#5 |
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mm's nitrous mod
2000 mustang gt
11.79@115.83
Join Date: Oct 2006
Location: N.W. AR
Posts: 8,982
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ptv issues also. the npi cars have less dish in the pistons giving higher compression and clearance issues.
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right now, she is a jackstand warrior  if the car was a horse, i would shoot it!!!  project warhorse under construction |
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September 13th, 2007, 01:53 PM
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#6 |
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Hardcore Enthusiast
1997 Mustang GT
Faster than an s4
Join Date: Aug 2007
Location: Seattle, WA
Posts: 1,315
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I know that you can do a straight swap from NPI heads to PI heads. with the intake and cams and everything. But the question I have is, will I get more power with the PI cam than the NPI one. I think so, but what about with a stage 2 head?
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September 13th, 2007, 05:02 PM
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#7 | |
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Enthusiast
Join Date: Oct 2006
Location: warren, Mi
Posts: 941
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Note: piston to valve interference usually occurs during the first .200" of lift. A ported head will lead to better performance when done correctly and with the proper supporting mods.
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Just another 10 second Mustang, what did you expect ? http://youtube.com/watch?v=BgykaUrmfvM
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September 13th, 2007, 05:12 PM
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#8 |
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Enthusiast
1998 Mustang GT
Need to hit the track
Join Date: May 2007
Location: Katy, TX
Posts: 855
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and what kind of supporting mods are those?
also, what kind of pistons would i need if i wanted to drop the compression of my engine after my PI swap aannnnd, would it be better to drop the compression after the PI swap or just leave it how it is? |
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September 13th, 2007, 06:19 PM
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#9 |
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Hardcore Enthusiast
1997 Mustang GT
Faster than an s4
Join Date: Aug 2007
Location: Seattle, WA
Posts: 1,315
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SO i guess, that you can use either in a NPI engine is what your saying. Just to make sure the cam you get will not have any PTV issues. I just want to know if I'll make more power with a NPI stage 2 or a PI Stage 2. Since they are PI heads and stock PI cams do more than PI cams, the Stage 2 PI cams would be best. Right?
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September 13th, 2007, 06:34 PM
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#10 |
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All Throttle with a Bottle
1996 Mustang GT
10.76 @ 122 with d/a of 8365 ft
Join Date: Dec 2006
Location: Lakewood, CO
Posts: 8,131
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I believe if u try and run a PI stage 2 cam in NPI heads u will have problems but Boomer will know for sure
__________________
1996 Mustang GT with a 351 swap with Stalled C4 1997 F250 Powerstroke 1999 28' Classic Dominator Special Thanks to: Andrews Racing Transmissions & Thanks for the help: PoorManMotorSports "Just Cause its Smoking, don't mean its broken" |
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