Re: WTF is wrong with my engine V. A20 built engine go boom.
 

whas wrong is its an a20. upgrade man. but for the record i agree with both these two ^

Re: WTF is wrong with my engine V. A20 built engine go boom.
 

Not equally. Say you are .005" over, not a huge deal. .005" under will scar your walls bad, quickly.

Re: WTF is wrong with my engine V. A20 built engine go boom.
 

.005 under and the piston wont fit in the hole, lol. Jon what kind of clearance did you end up with on you're vitara's?

Re: WTF is wrong with my engine V. A20 built engine go boom.
 

A little piston slap never hurt anyone. I would get the clearance on that block checked and go from there. You probably need more piston to wall clearance, but I'm not to sure if that's from too much or too little.

Re: WTF is wrong with my engine V. A20 built engine go boom.
 

so if you need it to have .003 clearence and your machinest goes to .008 there will be no problem ??




you will end up scoring the wall and the skirt becouse of to much pistons shift just like waffle said.

Re: WTF is wrong with my engine V. A20 built engine go boom.
 

I didn't say no problem, but much less of a problem than having too little clearance, which is way worse when the piston expands and contacts the cylinder wall.

Re: WTF is wrong with my engine V. A20 built engine go boom.
 

Unless you shove about 30 psi into the engine, to make the piston swell up with 600 whp worth of thermal mass and take up clearances. I know, I did it last week. Sure, the engine isn't lasting more than 8000-10000 miles, but you aren't regularly making that power any other way.

.005 over recommened spec is a bit much, tho.

Re: WTF is wrong with my engine V. A20 built engine go boom.
 

forged piston clearance should be .0025-.003" My cast vitaras had .0035" and the skirts got worn like yours. Not quite as bad though. Forged pistons expand more under temperature, so a tight piston to wall would ---- them up quick for sure

Re: WTF is wrong with my engine V. A20 built engine go boom.
 

the bores are very slightly worn on the thrust sides, but not scored, i think a quick hone would clean em up. This is going to be a high boost high hp engine so im not too worried about engine longevity. I think the small end on the rods is messed up too because they dont seem to float around as much as they need to, i think the rods are the cause of all of my problems right now. BTW these were used Crower billet B18a/b rods and the big ends were screwed up as well. I have some brand new eagle ESPs with 3/8" arp 2000 bolts going in in their place. Too bad the crower billet rods had a stronger rod bolt in them, they are nice pieces, but not jacked up...

Re: WTF is wrong with my engine V. A20 built engine go boom.
 

thank you