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It has been done 105 x 82 with the old crank. But not my me and not for 360 hours lol Contiman and others have done it. Not with standard mains. Some used 22206 spherical rollers others a 20mm wide nj2206 on the drive sideAnd not with this piston ! The jbs pistons are not as tallThe actual question is: weather this particular piston actually fits in a 644 with it's 24.5mm height? for the 80mm stroke with a rod length of 136.1 to 136.2mm and the piston at 24.5 the top of the piston is level with the cases.According to this site The 644 had 2 lengths of rod 134 and 135mm and an 82mm stroke so you can figure it Should work for the 134mm rod with a very large squish about 2mm . So yes it fits But!With the 135 mm rod squish will be nicer (same as with the 80mm crank) but Compression will be very high look out
It has been done 105 x 82 with the old crank. But not my me and not for 360 hours lol
Contiman and others have done it. Not with standard mains. Some used 22206 spherical rollers others a 20mm wide nj2206 on the drive side
And not with this piston ! The jbs pistons are not as tall
The actual question is: weather this particular piston actually fits in a 644 with it's 24.5mm height?
for the 80mm stroke with a rod length of 136.1 to 136.2mm and the piston at 24.5 the top of the piston is level with the cases.
According to this site The 644 had 2 lengths of rod 134 and 135mm and an 82mm stroke so you can figure it Should work for the 134mm rod with a very large squish about 2mm . So yes it fits But!
With the 135 mm rod squish will be nicer (same as with the 80mm crank) but Compression will be very high look out
