Plateau-Honing

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Anonymous

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I recently talked my nearest machine-shop-owning friend into ordering a set of Sunnen "plateau-honing" bore-finishing stones for his CK-10. He hadn't got them earlier because he wasn't confident that he could sell the extra service to enough customers to make it worth paying $150 for the stones. I told him I want all my future bore-and-hone jobs finished that way, and would front him part or all of the price of the stones.

Some of you have surely used these stones; Smokey Yunick was advocating them years ago. While I'm interested in hearing what you think of them, what I REALLY want to know is how long they last. Since I'm an investor, I want to know if the stones have a long life and can be used on lots of engines, or should we save them for ourselves and our buddies. Stubby? Deano?
 
The trick we used at Procell's was after finish honing to use a hand drill and a "dingle berry" glaze breaker. Make about 10 quick stroke in each bore to take the peaks off the hone pattern.
Same effect as plateau honing.

Engines, after final assembly, before installation were leakdown tested. A little oil and 100 psi air each cylinder. Not unusual for all holes to be under 5%.
 
ASMART":1phsrjld said:
OK I;ll ask, what is plateau honing?
Click to expand...

It's putting a final surface finish on the bores that mimics a bore that has been used and given a glaze break. Somewhere around Re16 roughness, which most shops can't measure anyway. It's desirable because most rings are lapped from factory these days and it would be a shame to have them used to do the final cut on the honed surface as has been the norm in decades past.

With diamond stones you don't get the metal drag and bore taper that carborundum is prone to deliver. So the rings aren't busy trying to handle the bits that tear off while breaking in.
 
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