[steve25]

I don't understand how we got into the subject of forged pistions and the clearances needed for such when it seems you have a good stock usable Bore with stock cast factory pistions.

What am I missing here?

Ball hone it , wash it out 3 times over, clean out any crap in the ring grooves with the tool you can buy for that then re-ring it and have good summer fun with it.

Also please note that when your running a cylinder Bore that likely has a taper to it and will be a tad oversized after the honin, then you do not want to run a plain iron compression ring, you want a ductile iron ring.

The flexing that the rings experience by the out of spec Bore will quickly fatigued a plain iron ring and reduce its outward tension needed to seal.
A ductile iron ring will hold up far longer in a used Bore .

[gtobird]

Originally Posted by steve25

I don't understand how we got into the subject of forged pistions and the clearances needed for such when it seems you have a good stock usable Bore with stock cast factory pistions.

What am I missing here?

Ball hone it , wash it out 3 times over, clean out any crap in the ring grooves with the tool you can buy for that then re-ring it and have good summer fun with it.

Also please note that when your running a cylinder Bore that likely has a taper to it and will be a tad oversized after the honin, then you do not want to run a plain iron compression ring, you want a ductile iron ring.

The flexing that the rings experience by the out of spec Bore will quickly fatigued a plain iron ring and reduce its outward tension needed to seal.
A ductile iron ring will hold up far longer in a used Bore .

Steve,

The engine is a stock bore, but I have not yet measured the individual bores for wear in any way. I mentioned that, but perhaps you missed it. If the bores and pistons turn out fine, then yes, I probably will go with a re-ring. but if it turns out there is too much wear, then I have to go another route on this build, hence my comment about wishful thinking and forged pistons.

I started the thread asking a simple question about what acceptable levels of wear are for a ring job and that's really all I was looking for. While I'm no where near the level of engine builder as many folks on this string, I've done around a dozen engines, but that's over nearly 50 years and not all of them were Pontiacs so I have a lot to learn in my retirement.

Now if I could only remember how many molecules in a mole.

OJ



.

[johnta1]

That is an easy one: 6.022*10^23