too much piston clearance? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

MugeNismo · 07-19-2009, 08:32 PM

im measuring my piston to cylinder wall clearance on my sr20det and i end up with an average gap of .0025in i am aware that oem nissan specs are .0004in - .0012in Ive heard of setups with gaps of .0045in with forged pistons, to me that seems like alot even with forged pistons expanding. i wanted to know if you could go any further with oem pistons safely and reliably?

fast-datsun · 07-20-2009, 11:24 AM

RE READ you FSM.... do not confuse MM with inch....

MugeNismo · 07-20-2009, 01:53 PM

no im very sure all measurements are of inches not mm. if anyone could post up what kind of pistons they have used and the clearance i would appreciate it. or if anyone knows the difference in size between the oem 0 1 and 2 grade pistons would be nice.

lewisfk · 07-20-2009, 02:19 PM

well i upgraded my pistons from the stock to to mahle pistons and i had to bore it .20mm over stock! if bought my pistons from enjuku, and theY explained it all to me . MM is the standard.

07-19-2009, 08:32 PM	#1
MugeNismo Join Date: Aug 2005 Location: Spotsylvania,VA Posts: 30 Trader Rating: (0) Feedback Score: 0 reviews	too much piston clearance? im measuring my piston to cylinder wall clearance on my sr20det and i end up with an average gap of .0025in i am aware that oem nissan specs are .0004in - .0012in Ive heard of setups with gaps of .0045in with forged pistons, to me that seems like alot even with forged pistons expanding. i wanted to know if you could go any further with oem pistons safely and reliably?

07-20-2009, 11:24 AM	#2
fast-datsun Leaky Injector Join Date: Aug 2002 Posts: 116 Trader Rating: (0) Feedback Score: 0 reviews	RE READ you FSM.... do not confuse MM with inch....

07-20-2009, 01:53 PM	#3
MugeNismo Join Date: Aug 2005 Location: Spotsylvania,VA Posts: 30 Trader Rating: (0) Feedback Score: 0 reviews	no im very sure all measurements are of inches not mm. if anyone could post up what kind of pistons they have used and the clearance i would appreciate it. or if anyone knows the difference in size between the oem 0 1 and 2 grade pistons would be nice.

07-20-2009, 02:19 PM	#4
lewisfk Zilvia FREAK! Join Date: May 2009 Location: North Austin, Texas Age: 44 Posts: 1,163 Trader Rating: (13) Feedback Score: 13 reviews	well i upgraded my pistons from the stock to to mahle pistons and i had to bore it .20mm over stock! if bought my pistons from enjuku, and theY explained it all to me . MM is the standard.