« previous next »
Pages: 1 ... 3 4 [5] 6   Go Down

Author Topic: crank stuffer  (Read 28011 times)

0 Members and 3 Guests are viewing this topic.

Brett

  • Guest
Re: crank stuffer
« Reply #60 on: January 02, 2008, 06:01:24 PM »
Aren't those conrods just for 4 strokes?
Shouldn't exhaust ports be flat on the top to make sudden pulse.
Logged

Offline bigbellybob

  • Sr. Member
  • ****
  • Posts: 261
Re: crank stuffer
« Reply #61 on: January 03, 2008, 09:30:16 AM »
Quote from: BDI on January 02, 2008, 05:35:45 PM
I guess a upside down triangle is a bad description It is a trapezoid. The idea is to have the left and right port walls get slightly closer together towards the bottom. when the piston first starts to uncover the port the gasses are under high pressure so it comes out fast but as more and more of the port is uncoverd the pressure drops and the gasses slow down. the idea is if the port narrows towards the bottom the gasses keep moving fast even though the pressure is droping.It's like when the river is wide the water flows slow but when the river narrows the water moves faster. Yes I'm sure the port has to flow less but this should make great bottom end torque and mid range. I want to make up for this with larger secondary exhaust ports but I do not think this would have that great of an impact on top end because we are not talking about making the port a lot smaller and by the time the port opens all the way It has allready done the vast majority of its flowing.

BDI is this close to what your talking about. the top would be stock and the bottom a BDI mod.
« Last Edit: January 03, 2008, 09:32:12 AM by bigbellybob »
Logged
IF RIDING IS OUTLAWED ONLY OUTLAWS WILL RIDE

IF RIDING IS OUTLAWED ONLY OUTLAWS WILL RIDE

IF RIDING IS OUTLAWED ONLY OUTLAWS WILL RIDE

IF RIDING IS OUTLAWED ONLY OUTLAWS WILL RIDE

sponsor
http://www.steelmx.com/

Offline BDI

  • Hero Member
  • *****
  • Posts: 1,533
Re: crank stuffer
« Reply #62 on: January 03, 2008, 10:54:27 AM »
Quote from: bigbellybob on January 03, 2008, 09:30:16 AM
Quote from: BDI on January 02, 2008, 05:35:45 PM
I guess a upside down triangle is a bad description It is a trapezoid. The idea is to have the left and right port walls get slightly closer together towards the bottom. when the piston first starts to uncover the port the gasses are under high pressure so it comes out fast but as more and more of the port is uncoverd the pressure drops and the gasses slow down. the idea is if the port narrows towards the bottom the gasses keep moving fast even though the pressure is droping.It's like when the river is wide the water flows slow but when the river narrows the water moves faster. Yes I'm sure the port has to flow less but this should make great bottom end torque and mid range. I want to make up for this with larger secondary exhaust ports but I do not think this would have that great of an impact on top end because we are not talking about making the port a lot smaller and by the time the port opens all the way It has allready done the vast majority of its flowing.

         

BDI is this close to what your talking about. the top would be stock and the bottom a BDI mod.

   Yep just like that.
Logged
Smoke every cigarette like It's your last and ride like you stole something!!!

Offline maddoggy

  • Hero Member
  • *****
  • Posts: 711
  • K5 @ ST. ANTHONY DUNES
Re: crank stuffer
« Reply #63 on: January 03, 2008, 11:04:43 AM »
brian, that makes good sense to me. i think you're on to something here. it could work, when are you going to try it?  MADDOGGY
Logged

Offline BDI

  • Hero Member
  • *****
  • Posts: 1,533
Re: crank stuffer
« Reply #64 on: January 04, 2008, 12:26:54 PM »
As soon as I can find a good cylinder to build the way I want. It will probably be a while though because I want to build a stroker crank too and the cylinder will have to be built to suit the stroked crank.
Logged
Smoke every cigarette like It's your last and ride like you stole something!!!

Offline kaw rider

  • Hero Member
  • *****
  • Posts: 1,218
  • Cool your engine with water not fuel
Re: crank stuffer
« Reply #65 on: January 04, 2008, 04:04:34 PM »
bdi
who's going to do the crank for you.
Logged

Offline doordie

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 775
  • Do or Die.....
Re: crank stuffer
« Reply #66 on: January 20, 2008, 07:16:25 AM »
Quote from: Brett on January 02, 2008, 06:01:24 PM
Aren't those conrods just for 4 strokes?
You can order for anykind of bike(2t or 4t),just measure and let them fabricate one. :wink:

Just 1000$ :-D
« Last Edit: February 01, 2008, 11:22:05 PM by doordie »
Logged
Iceroad champion 2006,still 2007,even 2008 without a single race!

Offline BDI

  • Hero Member
  • *****
  • Posts: 1,533
Re: crank stuffer
« Reply #67 on: January 20, 2008, 04:37:06 PM »
You know looking at the size of the rod It is going to displace more air in the bottom end and drive up the primary C.R.
Logged
Smoke every cigarette like It's your last and ride like you stole something!!!

Offline kaw rider

  • Hero Member
  • *****
  • Posts: 1,218
  • Cool your engine with water not fuel
Re: crank stuffer
« Reply #68 on: January 20, 2008, 06:04:21 PM »
check out this saw.
Logged

Offline BDI

  • Hero Member
  • *****
  • Posts: 1,533
Re: crank stuffer
« Reply #69 on: January 21, 2008, 03:51:35 AM »
Quote from: kaw rider on January 20, 2008, 06:04:21 PM
check out this saw.
What kind of horse power is it putting down at the chain :lol: :lol: :lol: :lol:
Logged
Smoke every cigarette like It's your last and ride like you stole something!!!

Offline doordie

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 775
  • Do or Die.....
Re: crank stuffer
« Reply #70 on: January 22, 2008, 01:04:46 AM »
Quote from: kaw rider on December 30, 2007, 05:25:43 PM
this cylinder kips have more travel then the stock kips do. toke some time but worth it.

How did you do that?  :-o
Logged
Iceroad champion 2006,still 2007,even 2008 without a single race!

Offline kaw rider

  • Hero Member
  • *****
  • Posts: 1,218
  • Cool your engine with water not fuel
Re: crank stuffer
« Reply #71 on: January 22, 2008, 02:13:08 AM »
doordie
i'm running 162* to 192* with kips. takes alot of time to do. i have about 15 hours in invested, but the next one i do i can do in about 7 hours. stewart cut .020 off base.
great pull from 4500 to the moon. i think stock  168* to 182* exhaust timing.
BDI
he has seen my exhaust port set up. i'm working on some other great  cylinder set ups. these engines when design made for 3500-6000 rpm range.
Logged

Offline doordie

  • Global Moderator
  • Hero Member
  • *****
  • Posts: 775
  • Do or Die.....
Re: crank stuffer
« Reply #72 on: February 01, 2008, 11:20:04 PM »
Quote from: kaw rider on January 22, 2008, 02:13:08 AM
doordie
i'm running 162* to 192* with kips. takes alot of time to do. i have about 15 hours in invested, but the next one i do i can do in about 7 hours. stewart cut .020 off base.
great pull from 4500 to the moon. i think stock  168* to 182* exhaust timing.
BDI
he has seen my exhaust port set up. i'm working on some other great  cylinder set ups. these engines when design made for 3500-6000 rpm range.

You,BDI,Steward and some others are serious tuners at this forum,glad to be a part of this mission to make K5 to a greater bike! 8-)
Logged
Iceroad champion 2006,still 2007,even 2008 without a single race!

Offline kaw rider

  • Hero Member
  • *****
  • Posts: 1,218
  • Cool your engine with water not fuel
Re: crank stuffer
« Reply #73 on: February 14, 2008, 10:29:29 AM »
bearings
Logged

Offline mdw471

  • Full Member
  • ***
  • Posts: 149
    • Wolbrink Race
Re: crank stuffer
« Reply #74 on: February 15, 2008, 06:42:04 AM »
kaw rider

are the balls (in your bearing) ceramic?

Mark
Logged
for more information about the World's Fastest Dirt Bike, www.wolbrinkrace.blogspot.com
Pages: 1 ... 3 4 [5] 6   Go Up
« previous next »