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Piston question GC8 rebuild. Pics of failure too.

Posted: Thu Jan 05, 2012 2:36 am
by wurkenman
The GC8 JDM engine we just put in my son's car turned out to be junk. After 1 week of run time and of course countless hours wiring and fitting engine to start with, the number 4 cylinder went dead. There was always a sort of an irregular miss or hesitation. We replaced coils and sensors and a multitude of other things along the way.
When the pistons were pulled here is what we found in number 4. I think the engine sat for an extended period and the ring froze the cylinder. Can't seem to come up with any other answer.

I have always used Wiseco pistons in the past. Do they work good in Subies too?


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Re: Piston question GC8 rebuild. Pics of failure too.

Posted: Thu Jan 05, 2012 2:39 am
by kimokalihi
Oh yeah they make wiseco pistons for subarus. Did the crank turn over by hand before you started it?

Re: Piston question GC8 rebuild. Pics of failure too.

Posted: Thu Jan 05, 2012 4:21 am
by wurkenman
kimokalihi wrote: Did the crank turn over by hand before you started it?
Yes it did. Seemed smooth before the install. I think the damage was done prior to me getting the engine. The warranty is void because I did not have the engine installed by a certified tech.

Re: Piston question GC8 rebuild. Pics of failure too.

Posted: Thu Jan 05, 2012 6:52 pm
by Legacy777
That sucks about the engine! The certified tech business is BS...

Yes Wiseco pistons work good in Subaru motors.

Re: Piston question GC8 rebuild. Pics of failure too.

Posted: Tue Jan 10, 2012 4:30 am
by wurkenman
New Wiseco pistons, Manley rods, bearings and a new stage 3 clutch on the way. Will try to remember to take some pics along the way. Need to find a shop to get the cylinders bored. I have a speed shop close by that says 300 or so to bore. Anyone know of some where else in the Minnesota Twin Cities area?