F22B1 build: which pistons to get, 86.5mm F23 pistons OR 87.5mm F22 pistons? Need gurus!
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From: San Antonio, Texas, USA
F22B1 build: which pistons to get, 86.5mm F23 pistons OR 87.5mm F22 pistons? Need gurus!
Im buildin a F22b1, block is sleeved (old skool GE godzillas), currently bored to 86mm but i need new pistons. The motor will be pushing a GT3076R, keep that in mind for the displacement purposes. Spinning the motor to about 6800...Heres a pic
Now the problem:
F23 86.mm pistons: http://www.raceeng.com/pc-7927-55-ho...a865mm851.aspx
(1) Are these F23 pistons different than F22s dishwise? I notice that the stock f23 pistons yeild a 9.3:1 CR in the f23 motor, but what would those pistons yeild in a f22 motor? Would it be the stock 8.8:1? (In other words, is the CR difference only because of the head design etc?)
(2) The CP F23 pistons are for 8.5:1 CR in a F23. What would that yeld in a F22b1 motor?
F22 87.5mm pistons: http://www.atomicspeedware.com/arias...ndapistons.htm
(1) Will 87.5mm's leave me with too little of a sleeve? I want to run 22psi on this GT30R.
(2) These pistons are made to yeild 8.8:a CR, which is a tad high for my liking, since i dont know if the block and head have been decked/resurfaced before...
- - - - - - - - - - - - - - - - - - - -
Im keeping my head at the stock 85mm and im looking for 450whp 400wtq+ and my turbo seems to be efficient at 22psi...
HELP ME GURUS
Now the problem:
F23 86.mm pistons: http://www.raceeng.com/pc-7927-55-ho...a865mm851.aspx
(1) Are these F23 pistons different than F22s dishwise? I notice that the stock f23 pistons yeild a 9.3:1 CR in the f23 motor, but what would those pistons yeild in a f22 motor? Would it be the stock 8.8:1? (In other words, is the CR difference only because of the head design etc?)
(2) The CP F23 pistons are for 8.5:1 CR in a F23. What would that yeld in a F22b1 motor?
F22 87.5mm pistons: http://www.atomicspeedware.com/arias...ndapistons.htm
(1) Will 87.5mm's leave me with too little of a sleeve? I want to run 22psi on this GT30R.
(2) These pistons are made to yeild 8.8:a CR, which is a tad high for my liking, since i dont know if the block and head have been decked/resurfaced before...
- - - - - - - - - - - - - - - - - - - -
Im keeping my head at the stock 85mm and im looking for 450whp 400wtq+ and my turbo seems to be efficient at 22psi...
HELP ME GURUS
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From: Crofton, MD
Re: F22B1 build: which pistons to get, 86.5mm F23 pistons OR 87.5mm F22 pistons? Need gurus! (91acc
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 91accordexr33 »</TD></TR><TR><TD CLASS="quote">
(1) Are these F23 pistons different than F22s dishwise? I notice that the stock f23 pistons yeild a 9.3:1 CR in the f23 motor, but what would those pistons yeild in a f22 motor? Would it be the stock 8.8:1? (In other words, is the CR difference only because of the head design etc?)</TD></TR></TABLE>
I would guess that the CR difference comes mostly from the difference in stroke and bore, between the f23 and the f22. the heads are largely the same.
your best answer is to use one of the many online CR calculators available. You'll have to contact either race eng or arias to get some of the specs on the pistons, but thats the only way you'll get an accurate answer.
(1) Are these F23 pistons different than F22s dishwise? I notice that the stock f23 pistons yeild a 9.3:1 CR in the f23 motor, but what would those pistons yeild in a f22 motor? Would it be the stock 8.8:1? (In other words, is the CR difference only because of the head design etc?)</TD></TR></TABLE>
I would guess that the CR difference comes mostly from the difference in stroke and bore, between the f23 and the f22. the heads are largely the same.
your best answer is to use one of the many online CR calculators available. You'll have to contact either race eng or arias to get some of the specs on the pistons, but thats the only way you'll get an accurate answer.
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91accordexr33
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Jul 1, 2007 10:30 AM
