Although its very good the piston will stay in TDC more time and mechanically a longer rod will remove stress from the stroke. Thats ALL ENGINE talk, big or small, but
on a 2-stroke engine port timming also changes with rod length, in a big way.
Let me put it like this, you have an engine with 1inch stroke, you have a 2inch rod length, when the crank is at 90 deg the rod's angle - which is proportinal to the rod's length - will be 22.5deg, this angle is one of the componets of the pistons position since it changes the relative length of the rod in temrs of the stroke , or the "Y" axis, imagine now you have the same 1inch stroke with a 1 inch rod length, the angle of the rod will be twice at 45deg!!!, the piston for that reason and since it moves on the same "Y" axis has to place it self farther down on the stroke, (In fact, that's the only thing that can happen since shortening a rod will make a piston accelerate and deccelerate quicker, and since it moves faster specially through the mid section of the stroke) so mechanically, you openned all the ports WAY sooner, you have just installed a race cam!
That's the reason OS v-specs
need such a high timming on their cranks, the engine has a short stroke and a long 30mm rod, so the real
dynamic timming is still conservative.
This is the main reason that some modders get different results from the same timming numbers on different engines, the quick numbers may be the same but when you put the rod/stroke relation in the equation the two engines have different timming.
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