Project "I needed to clean the air filter so I blew the motor"

[alward25]

Blaster has one, well two parts of one cylinder 

[USMC 500]

Blaster has one, well two parts of one cylinder 

I tried to con him out of those two pieces but he wont give them up........

I was going to hold the jug together with one of these.......

[USMC 500]

I thought I found a good replacement motor for my K5 but then I realized what it was so I disposed of it accordingly........

[Motorrad]

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.

[Motorrad]

thanks to Pmcg  for sending a sactaficial piston.



also reminded me how bloody heavy those wisecos are also

[cbrfrenzie]

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.

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]

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.

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?

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]

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?

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?? )

[sandblaster]

It's only your money 

[Motorrad]

Hmmm.


thick wall skirt, 3 hole windows, exh cooling hole's , modded skirt at transfers, long skirt, long rod, 88mm (stroke).  90mm piston  please.

[sandblaster]

Hmmmm.
I understand all that and the reasons which is shocking.....
But I'm really curious as to why not make the long rod 88.5 mm?

[Motorrad]

Hmmmm.
I understand all that and the reasons which is shocking.....
But I'm really curious as to why not make the long rod 88.5 mm?
Are you trying to maintain a square bore vs stroke?

I edited my post, because I figured I wasnt being clear.

[USMC 500]

All this sounds good, some of it is over my head, but I will gladly take the word of those who are intellectually superior to me involving matters of the K5 powerplant..........

I want everyone to take the time to thank me for blowing my motor so that all this R&D can take place to benefit all those who seek knowledge on the KXRiders site.........

I willingly took one for the team, kinda like jumping on a hand grenade for all of you.  You can send your "thank you" donations to my paypal account.

hahahahaha