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Post by adolfo4 on May 6, 2004 21:51:31 GMT -5
what are stroker cranks for and what do they help with whats the difference in a 4mm and 3mm one  |
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Post by |~RaYne~| on May 7, 2004 1:39:49 GMT -5
i stroker crank changes the lenght of your stroke for every mm of stroke you get it add's 3.5 cc to your motor's displacment...(im pretty sure)....
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Post by Kurt on May 7, 2004 13:25:09 GMT -5
4mm is just a different size than the 3mm. I run 3mm for motocross, but I know some people that run 4mm and 2mm also. They're all about the same.
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Post by blaster07 on May 7, 2004 13:54:42 GMT -5
yea those stroker motors give mad power  |
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Post by adolfo4 on May 7, 2004 17:36:21 GMT -5
cool how much are they and do i have to use race gas or something. will i get good power out of a 4mm?
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Post by adolfo4 on May 7, 2004 17:48:16 GMT -5
and do you know if a 30mm carb sucks up much more gas than the stock
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Post by hollywooddirt on May 8, 2004 9:31:19 GMT -5
Stroker cranks are made by welding the lower rod pin hole in the crank web and reboring it at an offset to add in millimeters to lengthen the stroke both upward and downward, the engine cases need to be machined so the rod does not come in contact with them after the stoke has been changed, 4mm which is the total a 2mm offset will give is the maximum the cases can handle as there is not enough material to machine out for the rod without getting into the case bolt holes, stroker cranks also add compression as the piston is going farther up in travel, strokers can be set up to run many different configurations and can be run with pump fuel if the port timing and the cylinder is set at the right height along with the head being milled and chambered for the set-up.
There is one downfall to a stroker crank, piston and cylinder wear are elevated as the rod is now offset enough as to force the piston against the intake and exhaust side of the cylinder walls move severly with the increase stroke causing faster wear on the sleeve.
The cost alternative to stroker cranks are the long rod crank, which does not have as severe of an angle as the stroker, but does not give the added compression, but does add intake volume giving you the stroker type torque, just not as much as a true stroker for about half the cost of a stoker crank.
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