Honda Internals? - question for markp
#21
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this is pretty interesting, a stroker crank i would imagine the journal could be taken +.045" outward, used with +.050 undersize bearings, and therefore increasing stroke by ... i dont know how much.
Mark, do you know how to calculate how much this would increase displacement on a stock 1.8 block?
Mark, do you know how to calculate how much this would increase displacement on a stock 1.8 block?
#22
this is pretty interesting, a stroker crank i would imagine the journal could be taken +.045" outward, used with +.050 undersize bearings, and therefore increasing stroke by ... i dont know how much.
Mark, do you know how to calculate how much this would increase displacement on a stock 1.8 block?
Mark, do you know how to calculate how much this would increase displacement on a stock 1.8 block?
The miata already has a shallow 1.108" compression height to the pin, The D16 Honda has a compression height of 1.181", so that 0.080" and the 5 mm longer honda rod all of sudden can cause issues. 8mm is roughly 0.320" reducing the compression height from 1.108" to 0.782" This puts the wrist pin into the ring lands, or damn close to it. There are solutions to this problem, but they are not really "inexpensive". It doesn't have to break the bank either, just requires some clever machine work.
Mark
PS - The Honda Rods are available in lengths from 5.290" - 5.485", the stock miata rod is 5.232", so keeping the shorter rod and keeping the compression height reasonable is still possible.
Last edited by Markp; 12-08-2006 at 10:15 PM.
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