FallenPhoenix New Member Nov 22, 2003 911 0 0 Odessa Tx Jul 11, 2004 #21 Jul 11, 2004 #21 Jake795 said: Don't forget about the COP ignition system, and different cams and intake. I'm sure that helped add that 45 extra hp Click to expand... I believe the combustion chamber design was slightly revised too. If anyone has pics of the combustion chambers of a non-pi and pi head, I'd really like to see the difference, if there is one.
Jake795 said: Don't forget about the COP ignition system, and different cams and intake. I'm sure that helped add that 45 extra hp Click to expand... I believe the combustion chamber design was slightly revised too. If anyone has pics of the combustion chambers of a non-pi and pi head, I'd really like to see the difference, if there is one.
B bdcardinal tree hugger Jun 10, 2003 3,612 16 69 santa barbara, CA Jul 11, 2004 #22 Jul 11, 2004 #22 NPI heads have the emissions shroud by the intake valve. also the chamber volume of the NPI head (51cc) is greater than the PI head (42cc).
NPI heads have the emissions shroud by the intake valve. also the chamber volume of the NPI head (51cc) is greater than the PI head (42cc).