A stroker kit is an aftermarket assembly that increases the displacement of a reciprocating engine by increasing the travel of the piston (that is, the piston moves farther up and/or down in the cylinder). This is done by replacing the crankshaft with one where the crank pin is moved farther away from the center of the axis of rotation of the crankshaft. While this increases displacement and torque it can potentially lower the limit to which the motor can rev safely compared to the stock configuration.
The man the legend Smokey Yunick. NASCAR banned his shrunkin 66 Chevelle from competition.Ha - this is a fun-loaded topic name.
I recall this from an ancient Smokey Yunick article I read in the olden days. Accuracy is not guaranteed.
A short stroke (ie crankshaft) motor revs up quicker and produces power in the upper RPM range.IMO, considering the rest of the drivetrain the long rod engine produces more torque at lower RPMs. Stump pulling power. The short rod engine revs up quicker and produces power in the upper RPM range.
1/2 " breaker bar is a long rod, 3/8" ratchet wrench is a short rod. You are the piston !
Got that backward. Long stroke either a shorter rod or the pin placed higher in the piston.Well, the stroked crank requires the longer rod. They wouldn't just install a longer rod on a stock stroke crank.
I give up !
I'm not an engine builder or high performance anything. I'm just remembering from how stroking was done back when.
To stroke a Sportster or Shovel Head the crank needed offset pins and longer rods with stroker plates under the stock cylinders to compensate for the rod length.
The result was a slower revving engine but much more torquing engine. Stump pulling power but harder to kick over ! Worked best on the heavy bikes.
I explained the easy answer to the OP's original question, long rod v/s short rod. Long wrench v/s short wrench !
You guys both seem to be confusing long stroke v short stroke with long rod v short rod. Two different things. Stroke is determined by the crank (not the rods) and yes, if you change the crank to one of a longer stroke, you need to shorten the connecting rods, or lengthen the cylinders (or both).What concerns me is the op's name is "SD CHOPPERS", which to me, sounds like the name of a shop.
I personally don't think I'd open a shop around building choppers before I learned how to build choppers... part of which is understanding different kinds of motors and builds.
I mean, props for trying to learn and all that and not being afraid to ask a question, but to start a shop before knowing what you're doing isn't too bright. I've seen quite a few fold like that, guys do one bolt-on mod and think they're a builder, or they think because they can work on theirs, that they can work on any. Cart before the horse and all that.
Never mind that a quick Google search can tell you the basic difference between a short stroke and a long stroke.
Exactly what I was saying !You guys both seem to be confusing long stroke v short stroke with long rod v short rod. Two different things. Stroke is determined by the crank (not the rods) and yes, if you change the crank to one of a longer stroke, you need to shorten the connecting rods, or lengthen the cylinders (or both).
Engine torque is not developed by the connecting rods or pistons, it is developed by the crank. Torque is a rotational force (the crank rotates). the pistons move up and down (linear) and the connecting rods just tie the pistons to the motion of the crank. A piston pushing with the same force at a larger distance from the center of the crank (longer lever arm) will produce more torque. That's how physics works.