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Old 08-09-2007, 07:27 PM   #1
Scooby Specialist
Member#: 82741
Join Date: Mar 2005
Chapter/Region: NESIC
Location: Bristol, CT
2007 350Z Silver

Default Silly but serious question

Can an OEM piston w/broken ringland be replaced with an identical(ie replace an A piston with another A piston) good piston, keep the old rings and not have to re-hone the block assuming there was no scoring/damage on cylinder bores?

FSM states only to bore/hone if out-of-roundness, taper or cylinder to piston clearance exceeds tolerance.
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Old 08-09-2007, 09:20 PM   #2
Scooby Specialist
Member#: 12811
Join Date: Nov 2001
Chapter/Region: South East
Location: Roswell Ga
2002 2.5l Wrx
517whp/516wtq (Stage pi)


I picked up 4 new stock pistons from one of our better known engine builders for $50 shipped. Rings were another 120 ( have to buy a set of 4) . The cylinder was in excellent shape so I just replaced the one that was bad. About 6 months later another one went so I decided it was time to go with better pistons.

I was pushing 400whp which I believe to be the limit of the stock sti pistons in a high compression (9:1) hybrid setup. If your power is near the limit of the pistons I would recommend upgrading so you don't go through what I did.
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Old 08-09-2007, 10:13 PM   #3
Scooby Specialist
Member#: 44256
Join Date: Sep 2003
Chapter/Region: Tri-State
Location: Long Island, NY
05 outback xt
02 wrx wagon - crushed :(


I would not reuse old rings, and from what I have read, you dont need to rehone a cylinder if a good crosshatching pattern is still there.

You should be ok with only replacing the one bad piston....

Also, pistons are designated not only an "a" "b" or "c", but also a "l" or "r" for left and right....
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Old 08-09-2007, 11:39 PM   #4
Scooby Guru
Member#: 95840
Join Date: Sep 2005
Chapter/Region: NWIC
Location: Pasco, WA
sold to a good bud
awaiting next car


do it, and let us know what happens!
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Old 08-09-2007, 11:49 PM   #5
Scooby Guru
Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
1990 Legacy wagon
goes 12.387 @ 116.5


While its not obviously recommended, I can see why you would want to do this from a monentary standpoint. And while you may get some unwanted blowyby it should be minimal.
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