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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: fly cutting pistons
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Mon, 12 January 2004 06:13
 
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dummy assembly is the most accurate way since not ever motor is alike. and piston-valve clearnce is particularly difficult, as cam lift, duration and ramp-rate (as well as head thickness, valve seat recession, etc etc) will affect the final numbers.
it involves putting head on with 1 set of valves (for one cylinder, measuring valve lift with dial indicator, and measuring crank angle at contact.
can also use plasticine on the top of the piston (maybe covered with gladwrap to stop it sticking to valve) rotate engine, same thign again.
you can use a used HG for initial measurements, but if you are getting the lumps machined, i'd recommend to use a new HG, torqued as will be done in final assembly, for every dummy fit.
dummy fit and measure as described above. double check all measurements. get pistons fly-cut professionally. dummy assemble again using 2mm thick plasticine. check that you have at least 1mm???? clearance between vlave and piston at all times (use a razor blade to slice thru the valve indent in the plasticine to see the clearance to the piston)
good luck.
at least you get lots of practice assembling the motor 
Cya, Stewart
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| | Subject | Poster | Date |
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fly cutting pistons
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ta2272 | Sat, 10 January 2004 10:51 |
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Re: fly cutting pistons
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V8_MA61 | Sun, 11 January 2004 05:26 |
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Re: fly cutting pistons
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onejayzed | Mon, 12 January 2004 06:00 |
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Re: fly cutting pistons
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oldcorollas | Mon, 12 January 2004 06:13 |
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Re: fly cutting pistons
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ta2272 | Thu, 15 January 2004 05:32 |
