Maintenance & Technical > KX500 Original
Project "I needed to clean the air filter so I blew the motor"
sandblaster:
Oh yeah!
I think your on to something...
Anybody with a Dyno? :-o
Love the cylinder clean up work :-D
Motorrad:
this design could also let ya cut the bottom of the intake skirt somthing like Yz250 skirts... for even more intake ............
(esentially a bottom window)
sandblaster:
I just gave away my last used k5 piston :x
I'll have to dig deep to see what I can find
alward25:
I have 2 used k5 wiseco pistons
cbrfrenzie:
--- Quote from: Motorrad on May 22, 2013, 03:09:13 AM ---the windows seem to just Skirt (yes pun intended) the re-inforcing ribs in the piston (wiseco) will have to test the wosssener. so that is a good thing.. that was one thing I was worried about.
--- End quote ---
Good day folks. I think you are on to something here Motorrad. I too think that the large lower port starves the boost ports, as the boost port pressure differential is higher than the huge gaping hole in the middle of the skirt creating a short circuit. By moving the piston port to the sides like that, the air will be diverted to the sides much better due to the pressure differential in the intake being moved outwards to the side triangle shaped ports, like you have cut. I believe this will in turn direct much more air to the side boost ports while the piston is still covering the main intake port.
I have a dyno at my work that I have full access to, anytime I need / want. I am already working on a test using two different window porting options to see what the relative results are. Perhaps I can help you guys out with some distinct numbers on these mods and the result (torque curve is what we are really interested in here). I will be plumbing in a couple pressure sensors so I can see the resulting waveforms with respect to the dyno run, to give me a closer idea of what the air is doing in there. I will be logging exhaust pressure, intake pressure at 2 different points, EGT, RPM and torque.
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