Engine BORING & HONING

[Adobe Machine]

I think it is real simple: Square and straight, no other way works. Bores to crank, deck to crank, bores w/o any taper..Sure , there may be some magic on heads, cams, induction and exaust, but you can not make a good motor with out the basics being correct, and to exact specs.You can not make a good engine with out the right equipment, or send it out to a good automotive machine shop.
Finally, automotive machine shops and their equipment have come to the
21st century in tolerances and quality. Not much cram and jam ( or as NC Cams says " SWAG" ) left in that industry, which is good..An automotive machinest has become a well trained tech.Unfortunatley the pay lags, but they are catching up.

Maybe you could use a Bridgey or clone to bore /hone a Briggs and Stratton

Adobe (old as dirt)

[chase78]

Was hoping to have different uses for my small machine.... but most VMC say not to use tooling that is no bigger then 3".... and most bores are larger then 3"......

I knew there was more to centering bores the just Zeroing off the block somewhere and making the current bore bigger.

thank you NC CAMS

[NC Cams]

To bore at more than 3", a VMC would probably be overtaxed.

However, if you had the oscillating speed potential, you could probably adapt a CK-10 Sunnen power honing stone setup to it and hone the bore oversize which is what the CK-10 does.

How you'd get it to power upsize the stone OD as the block is honed to size would have to be worked out (if it even could be) but the VMC could be programmed to oscillate up and down - at least it would remain on axis which the CK-10 can't do (thus it allows the honing stones to find/create theri own bore axis as they cut).

Clearly, some experimentation/adaptation would be required to have a VMC bore or power hone blocks