HOT RODS long rod kit

[cr2504life]

I was just wondering if anyone has any experience with long rod kits. I have heard that they don't really make more power it just changes the power curve. Is this correct? Well I was looking at a 2000 cr250 motor with one in it and I was kinda thinking about buying it. I think the motor would bolt up easily but again Im not sure. Does anyone know if this motor swap would be possible. I have a 97 cr250.

[psycho393]

stroking a motor usually produces more torque, something the later 2 stroke hondas have been weak on anyway. It's possible that the long rod kit gives it more torque and would possibly allow the bike to be shifted sooner than a non stroked motor. This is just general knowledge on the bore and stroke of combustion engines, and a rough guess at what things could be. I have no personal experience with these kits, but I doubt that you would be disapointed.

[mtk]

Long rods do not change the stroke of the engine. Stroke is dictated by the crank.

A longer connecting rod will put less side thrust on the piston into the cylinder wall, resulting in less friction. But the rods are generally heavier, so this gain has to be balanced with the additional dynamic forces placed on the crank, bearings, and such.

[ossagp]

Rod angle is something you can study for quite awhile. One of the things that a longer or shorter rod does is to change rod angle. Rod length to stroke ratios are something that engine designers and builders of 2 and 4 stroke engines look at a lot. I wont take much time with it here, but one of the bigger advantages of the longer rod is that it holds the piston at "dwell longer", thus allowing pressure to build longer (this alone can create a need for a higher octane rating or richer setting).

Stroking can indeed add low end, mostly due to the leverage advantage. On a two stroke it acts a little like a longer duration camshaft does on a 4 stroke. If you start out with a cylinder designed for a certain stroke and then add a millimeter or two of stroke,,just look at how much longer the transfers and exhaust ports are exposed.

[mike323]

I got a hot rod. It isn't a long one though...........