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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: 1,598
 iTrader: 0 reviews
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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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Proud American
 
1996 Mustang GT
10.76 @ 122 with d/a of 8365 ft
Join Date: Dec 2006
Location: Lakewood, CO
Posts: 10,164
 iTrader: 3 reviews
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Because its MM&FF
__________________
RIP Travis Billings  Special Thanks to: Andrews Racing Transmissions Baseline Suspensions Blown Small Block Ford with a hole in the block. 9.5 Dart Block 400 CI being saved for. Just because you can fuck a cactus doesn't mean you should. Never Lift Racecars |
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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: 1,598
iTrader: 0 reviews
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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 (old set up)
Join Date: Oct 2006
Location: N.W. AR
Posts: 12,430
iTrader: 8 reviews
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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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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: 1,598
iTrader: 0 reviews
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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
iTrader: 0 reviews
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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.
__________________
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: 856
iTrader: 0 reviews
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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: 1,598
iTrader: 0 reviews
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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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Proud American
1996 Mustang GT
10.76 @ 122 with d/a of 8365 ft
Join Date: Dec 2006
Location: Lakewood, CO
Posts: 10,164
iTrader: 3 reviews
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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
__________________
RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions Blown Small Block Ford with a hole in the block. 9.5 Dart Block 400 CI being saved for. Just because you can fuck a cactus doesn't mean you should. Never Lift Racecars |
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