Maintenance & Technical > KX500 Original
All about reed spacers -
Timbowe:
Soo what is the correct thickness? Do different thickness's make for varying engine torque ranges? Like the thinner the less torque and thicker more low end? Also back in the day, those who knew, used to bead blast the enterance of the intake port. This would mix up the fuel better. As opposed to smoothing the port off to resist drag. So many theorys, so little time, so little money! :|
Paul:
Correct, Timbowe. Rough on the intake is supposed to help keep the fuel / air charge atomized, and smooth on the exhaust to help flow. :mrgreen:
hughes:
I made my spacer out of 3/8 alumn. This might be stuid but I am going to throw it out there. I was thinking about tuning the thickness of the spacer by adding a extra reed gasket on before I mount the spacer(two gaskets, same as a thicker spacer, maybe three gaskets) What do ya'll think.
alan:
From Boyesen
THE GATEKEEPERS OF POWER
Looking to increase the performance of your Polaris watercraft without making a large investment? Try the new Reed Valve Spacer Kit from Boyesen. The Reed Valve Spacer Kit increases the intake tract length by moving the reed cage away from the crankshaft. This increases the flow volume under the piston and the rear boost ports in the crankcase. In this position, the reeds are allowed to function more efficiently. The action of the reeds are no longer impeded by the adverse effects caused by the rotation of the crankshaft. What you feel is improved low to mid-end response, more torque and horsepower.
KXcam22:
Alan,
I like that last explanation. My understanding is that (beside increasing the intake tract length - which you could also do after the reed cage) the spacer pulls the reed tips back away from the turbulence caused by the transfer ports. Without the turbulence, the flow through the reeds becomes more laminar (even). That is why a spacer is not a universal hopup for every engine. Depending on the amount of turbulence, the spacer will help or not do much at all. The increasing the thickness will likely make it work better (to a point - that why I made mine 1/2") but it would probably take something like 1/4" increments to notice (or measure) an improvement. Would be a cool test to do if someone had an engine mounted in a cart. You could build a 2" one to see what happens. Heck for a test you could build a quick one out of hardwood. Cam.
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