Factory Surface Finish Vs Costa Mesa R&D.mp4

Here's John Edwards @ Costa Mesa challenging the surface finish he gets with his Sunnen HBS-1300 to what comes out of one of the Big 3's factory. Pretty cool! Costa Mesa R&D Automotive Machine. (949) 631-6376. Be sure to 'Click' and SUBACRIBE.

Category:

Autos & Vehicles

Tags:

• cylinder
• head
• resurfacing
• surface
• finish
• challenge
• factory
• big-3
• chevy
• pontiac
• chevrolet
• ls
• ls1
• ls2
• ls3
• ls5
• ls6
• ls7
• aluminum
• burnout
• drags
• drag
• race
• autocross
• performance
• dyno
• pulls
• pull
• ra
• mitutoyo
• sj-201
• profilometer
• texture

[green95gt]

was the old gasket cleaned off before measuring the factory finish?

[fiatnutz]

@green95gt - Of course. The numbers would have been much higher if not.

[CosminRotaru]

but why? Why would you need that kind of finish?

[fiatnutz]

@CosminRotaru - To increase the grip/clamping pressure between the gasket, head, and block.

[fiatnutz]

@CosminRotaru - For the gasket to have better engagement with the head and block, and to meet factory recommendations.

[chickenofsea]

What is the major determining factor of surface smoothness? Cutting bit condition, feed speed, etc.? I know when I was machining brake rotors the slower the feed speed the better the job the lathe did, but that is quite a bit more simplistic than what you do there.

[fiatnutz]

@chickenofsea - All of the above. I use a CBN bit for the cast iron and a PCD for aluminum.

[CosminRotaru]

@fiatnutz so the gasket will not fill the small gaps..? I mean factory specs should be good... I might get my engine done and I want to know what to look/ask for, from the specialist. Unfortunately, I think you are to far away to take advantage of your services :) Thank you.