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Tom Barth
Joined: 22 Oct 2001
Posts: 1381
Location: United States, Michigan, Waterford
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 Posted: Wed Jan 18, 2012 5:38 pm Post subject: |
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Finally got a close up of a PWM today installed on a TM Moto. Looked the same as a Dellorto to me. I personally would block off the float bowl hose (bottom) and two of the upper vent hoses, put a tee in the pump to carb line and go racing. Nothing else but good tuning is required.
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Tom Barth
http://www.greenflagkarting.com/
Power is good...more power is better... too much power is just right! |
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Chris Reinhardt
Joined: 29 Aug 2002
Posts: 2933
Location: United States, New York, Ossining
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| Posted: Wed Jan 18, 2012 7:17 pm Post subject: |
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| Steve Buckner wrote: | | Took the overflow tube out of the bottle and zip tied it to the vent tubes at the top of the carb and there is no longer any fuel coming out of it. |
Usually that overflow is either pinched off or epoxied shut from the inside.
CR
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Andre Eriksen
Joined: 13 Nov 2009
Posts: 388
Location: United States, California,
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| Posted: Wed Jan 18, 2012 8:05 pm Post subject: |
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I have a brand new PWM pump around carb with dual pump setup for sale in the classified section.
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Don Zerangue
Joined: 27 Jul 2001
Posts: 81
Location: United States, Colorado, Avon
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| Posted: Wed Jan 18, 2012 8:48 pm Post subject: Pump around system |
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Michael Taska wrote:
Don, some tracks have banked turns. I used to race with a "T" fitting and floats in the bowl in the carb, ran ok everywhere except for a "bowl" turn at NHIS. 30 degree banked 180 degree turn. speed of 90 MPH.
Michael, I'm sure you are correct about high bank turns play havoc with float carbs.
I was addressing Oscar's sustained lateral g's of a few seconds or more. On a bank turn you have a vertical component of g's ,pushing the kart hard into the pavement, more than likely much greater than the lateral component, which pushes the kart to the outside of the turn. In a high bank turn the grip is increased by the vertical component ( to more clarify vertical component, that is the force pushing you down into the seat). F1 race cars use aerodynamic elements achieve this an increase grip. I am not certain that the g's reading are purely lateral, and 4 sustained g's banks or not, for 100mph kart is over the top!
As an ex USAF pilot, I can assure you, when you experience as much as 4 positive(or vertical) g's without a pressure suit or not using the "grunt" maneuver(an extreme tightening of the stomach muscles), the blood drains from the eyes, and you temporarily black out. That was happening a few years ago at the Texas Speedway on its high bank turns with Indy Race cars doing in excess of 200mph.
I agree with Oscar, hitting curbs will generate very high instant g's doing a real job on the ribs---I've been there!
Didn't mean to ramble off of the pump around subject! |
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Jimmy McNeil
Joined: 12 Apr 2006
Posts: 1465
Location: United States, California, visalia
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| Posted: Wed Jan 18, 2012 10:54 pm Post subject: |
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| Quote: | | I personally would block off the float bowl hose (bottom) and two of the upper vent hoses, put a tee in the pump to carb line and go racing. Nothing else but good tuning is required. |
| Quote: | | Took the overflow tube out of the bottle and zip tied it to the vent tubes at the top of the carb and there is no longer any fuel coming out of it. |
After careful consideration, I would highly recommend that all my competitors set their carbs up as recommended above. |
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Steve Buckner
Joined: 22 Apr 2003
Posts: 839
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| Posted: Thu Jan 19, 2012 10:24 am Post subject: |
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Last edited by Steve Buckner on Sat Jan 21, 2012 5:33 pm, edited 1 time in total |
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Chris Reinhardt
Joined: 29 Aug 2002
Posts: 2933
Location: United States, New York, Ossining
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Steve Buckner
Joined: 22 Apr 2003
Posts: 839
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| Posted: Thu Jan 19, 2012 11:33 am Post subject: |
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The one I use is a little off, Still working on it though. Cant get rid of the sputter mid corner off. |
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Brian Wilhelm
Joined: 18 Jul 2001
Posts: 876
Location: United States, Arkansas,
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| Posted: Thu Jan 19, 2012 12:40 pm Post subject: |
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| Steve Buckner wrote: |
The one I use is a little off, Still working on it though. Cant get rid of the sputter mid corner off. |
That's not a carb issue, that's a plug problem.
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Benn Herr
Joined: 18 Jul 2001
Posts: 1580
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Tim Doll
Joined: 18 Jul 2001
Posts: 2644
Location: United States, Washington,
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| Posted: Thu Jan 19, 2012 3:17 pm Post subject: |
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| Steve Buckner wrote: |
The one I use is a little off, Still working on it though. Cant get rid of the sputter mid corner off. |
OK, I have to ask....
What is that goop? 
It sort of looks like what I saw long ago when I opened up the carb on an MG Midget that hadn't been started in several years.
Tim
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Jeff DeMello
Joined: 13 Sep 2002
Posts: 2213
Location: United States, Pittsburgh Pa,
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| Posted: Thu Jan 19, 2012 3:30 pm Post subject: |
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Looks like that carb has been on a bike for many year in a junk yard
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Jeff DeMello
Emmick F125 Pavesi |
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Tom Barth
Joined: 22 Oct 2001
Posts: 1381
Location: United States, Michigan, Waterford
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| Posted: Thu Jan 19, 2012 5:36 pm Post subject: |
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Trust me Jimmy, you can't make the PWM run any better with a pump around. When the fuel is presented to the venturi at the venturi nozzle it doesn't matter how it got to the nozzle. Whether by positive pressure (PA) or negative pressure (right Al) it is still the same mixture provided by internal jetting.
I am not knocking the PA, just stating the fact that the carb, if plumbed properly will work just as well as the PA.
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Tom Barth
http://www.greenflagkarting.com/
Power is good...more power is better... too much power is just right! |
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Jimmy McNeil
Joined: 12 Apr 2006
Posts: 1465
Location: United States, California, visalia
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| Posted: Thu Jan 19, 2012 5:54 pm Post subject: |
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I dont use a pump around, I use Swedetech's gravity feed system. Trust me Tom, I've used every fuel system known to man, the ST GFS is the best.
| Quote: | | Here are a few drivers that could have used your help. There carbs were always bogging out of corners. Scott Speed, Phil Carlson, Alan Rudolph, Bobby Wilson, Ron White, Scott Holmboe, Benny Moon, Darren Elliott, Dan Di Leo, Jason LaPoint, Jason Bowles, Matt Champagne, Kyle Wharff, Kyle Martin, Joe Janowski, TJ Ross, Seth Ingham, Joe White, David Jurca, Tad Funakoshi, Kyle Wiegand, Ben Petter, Bill Fleming, Chris Farrell, Robert Cao Jr, Craig Sender, Burt Gasaway, Garrett Zine, Chris Jackson, Brandon Scarbery, Curtis Hewitt, Alan Sciuto, Graham Rahal, James Hinchcliffe, Richard Phillippe, Adrian Carrio, Kevin LaCroix, Robert Wickens, Dane Cameron, Brad Coleman, Cody Jolly, Billy Goshen, Steve Barros. |
Funny that the first name you used in that list of drivers is Scott Speed. His Dad and brother did the R&D and came up with this fuel system.
I hear that back when Scott was racing the ProMoto Tour, his dad developed and ignition box that worked pretty well. Now he developed a fuel system that is kicking butt.
As for the carb pic, you better send that in immediately to have it chromed and order a anodized bolt kit for it  |
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Alex King
Joined: 01 Mar 2004
Posts: 929
Location: United States, California, OC
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| Posted: Thu Jan 19, 2012 7:10 pm Post subject: Re: CR125 Fuel System |
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None of the above names matter...instead...these 8 elite drivers DO!!!
| Jason Berry wrote: | Quick List of SwedeTech customers using the GFS.
Jimmy McNeil – 2011 ProTour S4 National Champion
Mirko Torsellini – 2011 SuperNationals S1 Winner
Nick Neri – 2011 SuperNationals S2 Winner
Bonnier Moulton – 2011 SuperNationals S4 Winner
Jimmy McNeil – 2010 SuperNationals S4 Winner
Alex Speed – 2010 SuperNationals S1 Winner
Daniel Langon – 2010 SuperNationals S5 Winner
Alex King - 726 EKN Posts (and counting)
http://www.shopswedetech.com/category_s/86.htm |
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