Final grit to finish cylinder wall?
So Im going to hone this little Honda engine with that 3 stone honing tool. But the stones look too rough for a final finish. Does anyone have an idea what grit cylinder walls are finished with? Im not buying a $50 flex hone to rebuild a $100 engine, ha.
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There are finer stones out there,,but I do not remember the number...getting old I guess.:judge: |
Ok cool, thanks Glenn. I have another question for you, if I have to take off so much material that I need an oversized ring, can I run an oversize ring with a standard piston?
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I have heard of this being done. More than once. It depends on how much material you take out. Clearly it's not optimal, but within a thousandth or two it's not too bad. |
You must mean a hundredth or two. I could sneeze a thousandth off the cylinder wall.
Before hone - 2.662, after - 2.672. Thats exactly 1/100. Im going to just run a standard ring, I took more off the Vette motor when I blew up that last piston. |
That's actually a lot that you took off and will cause the piston to slap around. Are you sure about the measurement? The Probe pistons I run in the Cobra call for a clearance of .003 - .007. I had Dick finish hone the block for .005 because I'm not running an intercooler. That's what I had on with the 302 as well and it didn't have piston slap nor did it scuff the piston skirts even with how hard I ran it.
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.007 piston clearance is a .014 larger bore. And .03 sounds dangerously tight to me for forged pistons. I've heard of up to .012 clearance/ .022 larger bore.
I'd rather run too much clearance than not enough, without question. I've never heard of a piston rocking itself to death. Same with piston rings, I filed mine to the largest tolerance allowed. Who gives a fuck if it costs me 5hp? I dont want it binding when I push it heat soaked on a hot day. But anyways... compared to my SBC pistons, this little Honda piston has NO room to breathe. There is no rocking back and forth, in fact with the bit of rust that formed I had to smack the piston out of the hole with a hammer. Hard. So Im not terribly worried. If it was closer to .02/ .03 I would have gone with an oversized piston. |
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Most over size rings need to be filed to fit correctly. You DO NOT want the rings ends to butt when hot---that will rip off the top of the piston |
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The Mahle rings that came with my engine kit were not file fit rings but the end gaps were all over the place. They ranged from .008 up to .016. |
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The .004 per bore inch is general rule and is different for forced induction and Hypereutectic pistons........:p |
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