Maintenance & Technical > KX500 Original
Project "I needed to clean the air filter so I blew the motor"
cbrfrenzie:
--- Quote from: Motorrad on August 27, 2013, 04:36:23 PM ---Okay. back on subject.
lets chat piston some more.
Im thinking a top port like this, width of the rear boost.
and some skirt mods.
as I dont know if the skirts are tough enough for 3 holes.
will look into it more when there is a piston in my hand.
--- End quote ---
Once you start carving up your new/used piston it would be nice to see where a top port like this is with relation to the transfers. Does it extend the intake duration beyond when the transfers cover back up?
Motorrad:
--- Quote from: cbrfrenzie on August 28, 2013, 11:01:32 AM ---
--- Quote from: Motorrad on August 27, 2013, 04:36:23 PM ---Okay. back on subject.
lets chat piston some more.
Im thinking a top port like this, width of the rear boost.
and some skirt mods.
as I dont know if the skirts are tough enough for 3 holes.
will look into it more when there is a piston in my hand.
--- End quote ---
Once you start carving up your new/used piston it would be nice to see where a top port like this is with relation to the transfers. Does it extend the intake duration beyond when the transfers cover back up?
--- End quote ---
should be easy to see with my sweet half Jug that blaster sent me.
and the reason I want to add a port like that, is I believe the benefit of the S cut (big port in center) isnt more duration, but picking up trapped gass'es under the piston.
a higher up port liek the one I pictured would manage this, without messing with flow propertys of the flor and boost port.
as with those. we have same duration as a windowed piston... right............... dont think the skirt closes off those floor ports. Ill have to go look (memory isnt workign right now)
but Id like to add 2 more holes like the ones discussed earlyer, only smaller.
not sure if the pistons are stong enough for 3 holes...
cbrfrenzie:
Very nice, that will make this much easier to figure out. Are you thinking the skirt is too weak to run the two ports you were playing with a few months back?
Motorrad:
--- Quote from: cbrfrenzie on August 28, 2013, 11:13:41 AM ---Very nice, that will make this much easier to figure out. Are you thinking the skirt is too weak to run the two ports you were playing with a few months back?
--- End quote ---
im still playing with those.
But im thinking the benefit that was found in the previous window isnt due to more duration. but to releasing ALL those spent gasses under the piston into the boost port..
as we all know the K5 shrouds itself alot in the transfers at BDC. even with all MY skirt mods I already do.
hence the reason Im lookin at the VERY high up port. perhapse combine with the BOTTOM of skirt trimming (like the YZ250 pistons) I put up before may be the strongest and best way to go.
the bottom skrit cut will deff help those of us that have the jug jacked up to the moon like me.
Motorrad:
kinda where im thinking of going.
not sure if pistons are strong enough.
(Hmm custom batch of piston time?? )
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