Author Topic: Project "I needed to clean the air filter so I blew the motor"  (Read 125192 times)

0 Members and 6 Guests are viewing this topic.

Offline sandblaster

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 8,271
    • OEM-CYCLE QUALITY USED PARTS
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #135 on: August 31, 2013, 03:28:45 AM »
Thanks motorrad... yeah I edited my post after yours and after thinking  about it for a while this morning I can see the advantage over not overextending the rod length.  Base gaskets can do wonders..

USMC....  Keep watching and reading... I have had many revelations on this site over the last 3 years thanks to motorrads patience and the contributions of a few others.. you know who you are.   :wink:
The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Motorrad

  • Guest
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #136 on: August 31, 2013, 05:06:02 AM »
Thanks motorrad... yeah I edited my post after yours and after thinking  about it for a while this morning I can see the advantage over not overextending the rod length.  Base gaskets can do wonders..

USMC....  Keep watching and reading... I have had many revelations on this site over the last 3 years thanks to motorrads patience and the contributions of a few others.. you know who you are.   :wink:

Rod length would make the opposite effect as what I do with base gaskets.   your thinking is wrong.    longer rod is like trimming the base of the jug down.


I want longer rod, to be able to fix the flaw we have discussed before with the exh port...   as it is, there isnt enough room for longer skirt, without it hitting the crank.

Offline sandblaster

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 8,271
    • OEM-CYCLE QUALITY USED PARTS
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #137 on: August 31, 2013, 07:31:52 AM »
Nice....
I don't think I explained it very well but essentually what I was thinking was fix the trasfer port issue and allow for fine adjustment with thicker or thinner base gasket and mr dremel..

At the races and have a hard time typing on my phone.. :oops:
My brother just crashed trail braking into turn one duri ng practice.
Everything is good but it was a little scary.
« Last Edit: August 31, 2013, 08:35:23 AM by sandblaster »
The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Motorrad

  • Guest
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #138 on: September 03, 2013, 12:25:33 PM »
Okay. I wanted to run the top window port  as wide as the widest part of the rear boost port.

mocked it up in my Half jug.


and.   when the transfers JUST open.   the top of that port will already be roughly halfway down the wide portion of the rear boost port.


sooooo.


I can either cut it as a upside down trapezoid,  or make it square and the same width as the narrow portion of the rear boost port (same width as the previous "S" pistons)...


The pointed (stainless dental tool) marks where the top of the window port would be, when the ports open.






here is the top of the boost port (dental tool)





which is roughly here...   special note  (making my calculations based on WOSSENER piston machining, as there is a big step cut there in the crown...   )


Offline sandblaster

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 8,271
    • OEM-CYCLE QUALITY USED PARTS
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #139 on: September 03, 2013, 12:30:12 PM »
Don't you just love your cutaway cylinder half  :-)
I see black powder stuff...
The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Motorrad

  • Guest
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #140 on: September 04, 2013, 12:48:03 AM »
Don't you just love your cutaway cylinder half  :-)
I see black powder stuff...

yes... yes I do.

Motorrad

  • Guest
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #141 on: September 04, 2013, 08:48:31 AM »
thoughts and oppinions on the piston boost port windows?

Offline alward25

  • Hero Member
  • *****
  • Posts: 1,349
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #142 on: September 04, 2013, 12:03:41 PM »
Looks like a great plan, need an engine to try it?  Want me to send you a piston?
"Let there be light"

Offline USMC 500

  • Giant Member
  • Hero Member
  • *****
  • Posts: 1,026
  • Sikorsky CH-53E the KX500 of Marine Corps aviation
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #143 on: September 04, 2013, 12:15:41 PM »


USMC....  Keep watching and reading... I have had many revelations on this site over the last 3 years thanks to motorrads patience and the contributions of a few others.. you know who you are.   :wink:

OOHHHHHHHHHH!!!!!!! :-o :-o :-o :-o :-o :-o :-o :-o :-o

Combined with the "cylinder cut away" thread and reading back on this thread all I can say is this!!!!

I once heard my buddy Bill ask Danny Hamel after a race....
"How can someone who looks like a high school band tuba player go so d**n fast on a bike?!"

Offline 81cr450

  • Hero Member
  • *****
  • Posts: 887
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #144 on: September 04, 2013, 12:29:39 PM »
Quote
I dont know if the skirts are tough enough for 3 holes.

I like the idea but

 

look at where mahle is puting their struts on modern designed pistons
 
I do like the middle high & tight like you have I think of the piston swinging around in there like swinging a bucket full of water in a circle, the most pressure is going to be in the very bottom. It also puts it opening above the reeds so they dont impede flow. I also vote rounded hole edges , nothing square or triangular as it focuses load. Just my 2-cent, from one who doesnt know
if I only had a pair, I could actually ride this thing

& to the people I like  FYYFF

Offline USMC 500

  • Giant Member
  • Hero Member
  • *****
  • Posts: 1,026
  • Sikorsky CH-53E the KX500 of Marine Corps aviation
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #145 on: September 04, 2013, 12:37:37 PM »
Quote
I dont know if the skirts are tough enough for 3 holes.

I like the idea but

 

look at where mahle is puting their struts on modern designed pistons
 
I do like the middle high & tight like you have I think of the piston swinging around in there like swinging a bucket full of water in a circle, the most pressure is going to be in the very bottom. It also puts it opening above the reeds so they dont impede flow. I also vote rounded hole edges , nothing square or triangular as it focuses load. Just my 2-cent, from one who doesnt know


+1 :-)............ok, ok.......I think I'm tracking all this now........ :-o
I once heard my buddy Bill ask Danny Hamel after a race....
"How can someone who looks like a high school band tuba player go so d**n fast on a bike?!"

Motorrad

  • Guest
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #146 on: September 04, 2013, 04:14:37 PM »

Offline USMC 500

  • Giant Member
  • Hero Member
  • *****
  • Posts: 1,026
  • Sikorsky CH-53E the KX500 of Marine Corps aviation
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #147 on: September 04, 2013, 04:40:13 PM »


Well, we have a 3 window design......the teeth are low enough to close off the intake as the transfers open up...........I think we found a final design that will work!!
« Last Edit: September 04, 2013, 05:01:53 PM by USMC 500 »
I once heard my buddy Bill ask Danny Hamel after a race....
"How can someone who looks like a high school band tuba player go so d**n fast on a bike?!"

Offline motopunk

  • Hero Member
  • *****
  • Posts: 1,150
    • www.der-motopunk.de.tl
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #148 on: September 04, 2013, 07:22:54 PM »


Well, we have a 3 window design......the teeth are low enough to close off the intake as the transfers open up...........I think we found a final design that will work!!



indiana jones and the secrets of the piston scull...  8-)
big 2 stroke bikes are weapons for real men, who don´t fear death or devil. ;O)
´83 kx250, ´87 kx250 (with 360 big bore), 87 kx500, ´93 kx500 sfc

---  www.der-motopunk.de.tl  ---

Motorrad

  • Guest
Re: Project "I needed to clean the air filter so I blew the motor"
« Reply #149 on: September 08, 2013, 04:11:18 AM »
Quote
I dont know if the skirts are tough enough for 3 holes.

I like the idea but

 

look at where mahle is puting their struts on modern designed pistons
 
I do like the middle high & tight like you have I think of the piston swinging around in there like swinging a bucket full of water in a circle, the most pressure is going to be in the very bottom. It also puts it opening above the reeds so they dont impede flow. I also vote rounded hole edges , nothing square or triangular as it focuses load. Just my 2-cent, from one who doesnt know

hey 81. that pic isnt showing up.   can you re-post it ...  Im curious what your showing me..   also what its off of would be nice 

 8-)