legacycentral bbs

The good news:
piston squirters are all still in.
pretty good shape for 200+k

The bad news:
#4 piston in bad shape


#4 cylinder in bad shape



and the worst is the thrust bearing is completely destroyed






Troy

now you'll be forced to get the forged pistons you really wanted anyway

Forged pistons are overkill for what I want out of the engine.

300hp is all that I'm looking for. From the people that I have talked to the stock short block is plenty strong to do it.

I will be getting some different bearings though.

what bearings you getting?

I havn't decided yet, either cobb or crawford piston ones.

I just talked to http://www.ccrengines.com/ and they said that the reason the bearing was chewed up so bad was the fsm has a wrong torque spec for the crank pulley bolt. The fsm says 76lb/ft and they say 125lb/ft.
Anybody else ever heard of this?

Yeah, that problem has been discussed on this board before. A few people had the crank pulley come loose a little bit and chew up the key. But no one's actually taken apart the engine and noticed internal bearing damage because of this.

It makes sense, tho. Without the dampener properly fitted to the crank, there will be excessive force on the crankshaft bearings.

They said that 9 out of 10 times if the main bearings failed, it had been within 6-12 months of a timing belt change.

Makes you want to retorque your pulley bolt doesn't.
I know I will tonight.

Damn, maybe that's the cause of my failure. I did notice a wierd noise a couple nights after i finished the headgaskets but thought nothing of it because it only lasted a minute or so.

Yeah mine started making a strange noise a few days ago. Hopfully its not to late.

Get the Cobb bearings. Sorry to see it in such bad shape. Hopefully it isn't so far gone that you can't hone it out without overboring...

I'm still looking for a machine shop that will even look at it. All the ones in my area are domestic only.

Maybe try a marine place. They have to do all kinds of engines.

Steve

I finally found a place that can do it but, I also found out that there are no oversized pistons available from subaru.

this post talks about it http://bbs.legacycentral.org/viewtopic.php?t=20735


There is a chance that I can hone the cylinders and take out the scuffing. If that works I can use a stock size piston.

I'm going to take some measurements tonight and hone the bore to see if its worth moving forword.

Troy

IIRC a set of custom forged piston are actually going to run you about the same price as new OEM ones. Food for thought.

My two posts should probably be merged.

sorry

I responded in your other thread.

I think Morgie paid like 130 for customs from cp pistons.

Steve

Whaaa? I thought they were around $460 usd.

really?
They just quoted me $575 for a set.

Looks like it was $135 per piston.

http://bbs.legacycentral.org/viewtopic. ... ht=pistons

That sounds a little more like what they quoted me.

I replyed to the other post

135$USD is what i paid for the custom pistons, including pins, locks, rings.

be sure to mesure your worst cylinder before ordering your custom oversized pistons! And verify with your machineshop what oversize they prefer work with. (.20mm, .25mm.. )

At first I was like, whaaaaaa?!! The I realized you were using metric examples for the oversizing.

Steve

oups yeah, i edited to include unit ehe .20"Oversize, that's huge! haha

From the look of that scuffing, I don't think you have a chance of honing that out. It might look OK when you are done, but the eccentricity would be terrible compared to acceptable specs.