New sti pistons?????

Bones · **Posted:** Fri Oct 23, 2009 11:48 pm

Boom!!!!

bhhamblin · **Posted:** Sat Oct 24, 2009 3:00 am

lol been there done that

08WhiteRex · **Posted:** Sat Oct 24, 2009 8:58 am

Me thinks they aren't forged anymore....

kentrik · **Posted:** Sat Oct 24, 2009 9:08 am

Yeah....On second thought suby25, I think I'll pass on taking your STi engine. :lol:

FIVEohREX · **Joined:** Mon Mar 31, 2008 6:06 pm **Posts:** 201

how did your block fair? I'll post some pics of my rods and pistons.. makes me sad ;(

bhhamblin · **Posted:** Sat Oct 24, 2009 10:48 am

08WhiteRex wrote:

Me thinks they aren't forged anymore....

STi pistons arent forged but the rods/crank are. They are cast and as you can see they blow. If STi had cast pistons it would be a very very stong motor.

PCSkiBum_21 · **Posted:** Sat Oct 24, 2009 9:08 pm

i've never done that.

suby25 · **Joined:** Wed Aug 19, 2009 8:10 pm **Posts:** 256

block is just fine. the piston fell apart after it was out of the motor. through a new piston in and gtg

PCSkiBum_21 · **Posted:** Sat Oct 24, 2009 11:54 pm

at least re-hone the block. get it measured to see if it needs to get bored bigger or not. should be totally re-usable.

08WhiteRex · **Posted:** Sun Oct 25, 2009 9:07 am

Yeah you should definitely have the all of the cylinders reworked. It doesn't take much to wreak havoc on something as precise as a modern engine...

ChriS · **Posted:** Sun Oct 25, 2009 10:07 am

^^why have all the cylinders reworked? Wasn't it just one piston that went out.

08WhiteRex · **Posted:** Sun Oct 25, 2009 10:53 am

Yeah but then you have one cylinder with a larger bore, a new piston, and the possibility of metal fragments having bounced around within the crankcase and buggered up the other cylinders. You want your engine to be balanced. And you REALLY don't want pieces of metal, even tiny ones, in between pistons and cylinder walls... That's why its a good idea to tear the whole engine down and replace at least all of the pistons and machine the cylinders if you're going to be doing one anyways.

ChriS · **Posted:** Sun Oct 25, 2009 11:06 am

08WhiteRex wrote:

Yeah but then you have one cylinder with a larger bore, a new piston, and the possibility of metal fragments having bounced around within the crankcase and buggered up the other cylinders. You want your engine to be balanced. And you REALLY don't want pieces of metal, even tiny ones, in between pistons and cylinder walls... That's why its a good idea to tear the whole engine down and replace at least all of the pistons and machine the cylinders if you're going to be doing one anyways.

he said the piston fell apart after he pulled it out so........

08WhiteRex · **Posted:** Sun Oct 25, 2009 11:10 am

Yeah but that means that it broke in the cylinder and the space constraint held it together. Trust me, it's a good idea to do a complete tear down whenever a major component fails, at least if you want to maintain decent compression for more than 2k miles...

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New sti pistons?????

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