almost_les
Zone Head
Posts: 590
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posted September 21, 2011 02:39 PM
valve lapping overkill question...
got all my valves lapped with coarse then fine compound, wondering if it would be worth trying something more fine? i got some dremel polishing compound that i could use, or am i beating a dead horse here? i got another week until my block is back so i'm trying to fill some time. already lapped the head with 400 then 600 last time it was apart, this time i just had to hit it with 600 to clean it up.
  
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almost_les
Zone Head
Posts: 590
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posted September 21, 2011 04:07 PM
did some googling, looks like the "fine" compound i bought is only 220 grit. i think i'll touch it with some 320 grit and call it a day.
http://www.itwconsumer.com/productfiles/tech_99.pdf
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2000redrocket
Pro
Posts: 1662
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posted September 23, 2011 05:53 PM
the hardened surface of the valve face is in microns. do not get over zelous.
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whitehendrix
Zone Head
fails!
Posts: 757
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posted September 24, 2011 07:39 PM
YES. that, and as well, you don't want a seat that is too wide as well. going nuts and shooting past the .045-.055" or so most seats reside at leads to a bad day.
you can lap most times with fine grit just to clean the mating surfaces up and call it a day.
____________
Duct tape is the handyman's secret
weapon. The black is for formal
occasions. - ZRXDean
ill never own a busa unless
someone gives me one.... and then
ill sell it -KZScott
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almost_les
Zone Head
Posts: 590
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posted September 25, 2011 02:59 PM
10-4. finished them up today. went over all the seats with a magic marker first so i could make sure i do a light job.
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whitehendrix
Zone Head
fails!
Posts: 757
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posted September 26, 2011 12:06 AM
magic marker is good in a pinch but i have definitely found it'll smear sometimes or not quite "act right".. machinist dye is the greatest thing ever.
very thin, dries fast, gives a solidly defined line and theres no guessing as to if the mark is true.
post some pics!! always love to see an engine build
____________
Duct tape is the handyman's secret
weapon. The black is for formal
occasions. - ZRXDean
ill never own a busa unless
someone gives me one.... and then
ill sell it -KZScott
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Michaels12
Novice Class
Posts: 43
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posted September 27, 2011 01:46 PM
magic marker = poor guys Dychem
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2000redrocket
Pro
Posts: 1662
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posted September 27, 2011 02:14 PM
still smells good though 
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