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Old Streetfighter Motorcycle Forum Post 06-07-2016, 11:51 AM   #11
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Default Re: question about machining a piston

There's also doing it in the engine, but there's a significant amount of assembly/disassembly to do each valve. It does, however, guarantee that you will have everything dead center and at the correct angles.

Good explanation here. This is the way I was always taught to do it because it's removed the most "human error" variables.

http://www.hotrodders.com/forum/show....php?p=1019296

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Old Streetfighter Motorcycle Forum Post 06-07-2016, 03:29 PM   #12
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Default Re: question about machining a piston

Just out of curiosity, how deep of a cut are you looking to make?
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Old Streetfighter Motorcycle Forum Post 06-08-2016, 12:44 PM   #13
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Default Re: question about machining a piston

this was what I used last time I had to machine a piston



a pot a nice fit on the piston held with the gudgeon pin with a bush inside with tapped holes in either end
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Old Streetfighter Motorcycle Forum Post 06-08-2016, 06:24 PM   #14
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Default Re: question about machining a piston

appx .03 on intake and appx .055 on exhaust
set it up on a sine bare and bypassed the quick clamp for a better hold on the piston
worked pretty good
Thanks for all the info
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Old Streetfighter Motorcycle Forum Post 06-09-2016, 08:34 AM   #15
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Default Re: question about machining a piston

.055 inch or mm? If inch, DAMN! With that much interference I would have been looking for another way to fix the issue. A valve hidden behind .055" of valve relief pocket can't breathe anyway. Anyway, jobs done now.
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Old Streetfighter Motorcycle Forum Post 06-09-2016, 04:00 PM   #16
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Default Re: question about machining a piston

Quote:
Originally Posted by shinyribs View Post
.055 inch or mm? If inch, DAMN! With that much interference I would have been looking for another way to fix the issue. A valve hidden behind .055" of valve relief pocket can't breathe anyway. Anyway, jobs done now.
inch...the were changing the angle on them...didn't touch one side and appx .055 cut on other side...they're for a pulling truck motor

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Old Streetfighter Motorcycle Forum Post 06-29-2017, 10:52 PM   #17
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Default Re: question about machining a piston

Just out of curiosity... does it matter if the piston is cast or forged?
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