Maintenance & Technical > KX500 Original
Project "I needed to clean the air filter so I blew the motor"
SHLEPY:
This makes a lot of sense if the jug has the ports why not the piston...Looks good Mr M!!!
cbrfrenzie:
--- Quote from: Motorrad on May 22, 2013, 05:53:20 AM ---once again. this is all just REALLY REALLY ROUGHed out stuff. dont judge radius's, exact shape, size etc etc etc..
here is what I was thinking from the yz250 pistons.
this bottom cut CLOSES just as the transfers open...... which should keep it from starving the lower floor port and the boosters...
(last 2 pictures taken right as transfers open)
--- End quote ---
Interesting idea there with the lower piston skirt shaping there in the last 2 pictures. I think we want to be careful with that area, as to not decrease the pumping effect of the piston moving down. If there is an opening there when the pressure under the piston is greater than the intake, air will flow in reverse into the reed chamber. Your pictures are very informative, I like how the angle you cut into the piston is different than than the angle of the boost port. This gives a nice transition into the piston boost port, which will reduce negative turbulence as the piston moves upward sucking air into the case. That angle and depth may be good parameters to experiment with. Keep it up, I'm liking your ideas!
Motorrad:
I 100% agree we need to be carefull in that area... I think as long as it closes the bottom before the transfers open up... we should be fine... ??? :?
heck.. would be better than that low window in the "S" pistons. that would be a problem just as you described.
sandblaster:
How much closing is enough :?
Motorrad:
--- Quote from: Motorrad on May 22, 2013, 05:53:20 AM ---once again. this is all just REALLY REALLY ROUGHed out stuff. dont judge radius's, exact shape, size etc etc etc..
here is what I was thinking from the yz250 pistons.
this bottom cut CLOSES just as the transfers open...... which should keep it from starving the lower floor port and the boosters...
(last 2 pictures taken right as transfers open)
--- End quote ---
for refferance.... here is a "S" piston in exactly the same location as the last to pictures above. (exactly when the transfers open) you can imagine how that would starve the rear boost port....... and as far as lower skirt cutting.. the one I showed cut, that closes as the transfers open.. has to have better pumping action than the "S" piston, that is WIDE OPEN .... YES NO? Im just going off my thoughts here... What ya think CB?
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