Maintenance & Technical > KX500 Original
crank stuffer
stewart:
i am building a crank stuffer for the kx500 i think the volume needs reduced in crank case to increase the velocty of fuel charge in transfers and riase crank case comprsion any input greatly appreciated stewart
YUNGGUNNAZ:
i agree.especially if cylinder has drag port and cases have been matched with entrance rolled back.i have used devon epoxy for this before doing the bottom half way up with some shaping.can't wait to see what you come up with.check some of the moped or pocket bike sites.i think i saw something done there.
KXcam22:
JB weld works nice. Machines cleanly to a smooth surface. Isn't there a ratio between case and transfer port volume you try to shoot for? I can't recall what it is anymore. Cam.
doordie:
Good for flow BUT with higher pressure and the fresh charge maybe pushed
out `cause your high transferduration of approx 130 degrees,this at low rpm.
You can reduce transferduration to reduce that but you get a narrower powerband
though.
The aim of transfers must be reshaped to enter more at back of barrel to reduce
lost of charge.
You can try in small steps and see what?s happening,maybe KX500 have to low crankcase compression stock.
crankcase volume at TDC/crankcase volume at TDC - cylinder volume is the formula.
I think a expansion chamber with steeper cones will do the jobb better and still have 130 degrees of inlet duration left. :wink:
//doordie
Friar-Tuck:
Stewart,
This is an old book however I believe the formulas are still applicable.
This is a whopper of a pdf.
http://www.edj.net/2stroke/jennings/2stroketunershandbook.pdf
Best of luck,
Tuck \o/
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