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Jeff DeMello
Joined: 13 Sep 2002
Posts: 2219
Location: United States, Pittsburgh Pa,
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 Posted: Sun Oct 21, 2012 8:32 am Post subject: |
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Cesar you don't need it
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Jeff DeMello
Emmick F125 Pavesi |
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Cesar Rull
Joined: 08 Sep 2012
Posts: 317
Location: United States, Florida, Pembroke Pines
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| Posted: Sun Oct 21, 2012 9:42 am Post subject: |
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Jeff so I am told I don't and EGT, you tell me I dont need a wideband. So I will respectfully ask thing. How do you guys tune your engines? Because I understand that every time at the track you need to change jets or whatever going in the carb. I have no experience with a carburetor, but I do have experience tuning fuel injected cars on a dyno and road. I always had a wideband to KNOW where the A/F was and what I needed to change.
Can you please, maybe via PM explain how the tuning on the CR125 is done out any tools? |
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Tim Salvino
Joined: 20 Nov 2010
Posts: 261
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Cesar Rull
Joined: 08 Sep 2012
Posts: 317
Location: United States, Florida, Pembroke Pines
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| Posted: Sun Oct 21, 2012 10:14 am Post subject: |
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| ^ like an RC car... ill read it thank you. |
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Jim McMahon
Joined: 07 Apr 2007
Posts: 2787
Location: United States, St. Paul,
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| Posted: Sun Oct 21, 2012 8:28 pm Post subject: |
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| Cesar Rull wrote: | | So I will respectfully ask thing. How do you guys tune your engines? |
"Baselining". It comes down the the stopwatch and the appearance of the piston crown/exhaust header. Its old school but it works. Start with a bigger jet and work down until the correct appearance is found, note jet size and air density. Then monitor air density changes and change the jet size according to change in air density.
EGT at the best of times can be affected by many different factors, including the driver. It's handy as a reference but really to start out I would buy an air density gauge or weather station before buying an EGT probe for a shifter.
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Chris Reinhardt
Joined: 29 Aug 2002
Posts: 2954
Location: United States, New York, Ossining
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Jim McMahon
Joined: 07 Apr 2007
Posts: 2787
Location: United States, St. Paul,
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| Posted: Mon Oct 22, 2012 6:51 am Post subject: |
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| Chris Reinhardt wrote: | Lean it out still it sticks, go up one jet size!!!! 
CR |
This works too.... Just don't stick it at 5PM one day and hit the track at 6AM the next hehe. At least not in September up in the Midwest.
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Johnny Brooks
Joined: 04 Aug 2005
Posts: 315
Location: United States, Virginia, Arlington
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| Posted: Mon Oct 22, 2012 8:47 am Post subject: |
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Hope yer not buyin that stuff by the gallon due to 'necessity'?  
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The pessimist sees difficulty in every opportunity. The optimist sees the opportunity in every difficulty.--Winston Churchill |
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Jim McMahon
Joined: 07 Apr 2007
Posts: 2787
Location: United States, St. Paul,
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| Posted: Mon Oct 22, 2012 1:16 pm Post subject: |
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| Johnny Brooks wrote: | | Hope yer not buyin that stuff by the gallon due to 'necessity'? |
Haven't bought any yet. When I blow a motor, acid ain't gonna fix it!
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Chris Reinhardt
Joined: 29 Aug 2002
Posts: 2954
Location: United States, New York, Ossining
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| Posted: Mon Oct 22, 2012 3:22 pm Post subject: |
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| Jim McMahon wrote: | | Just don't stick it at 5PM one day and hit the track at 6AM the next hehe. At least not in September up in the Midwest. |
Actually works extremely well for different weather conditions if you recorded what the weather was when you stuck it, add one jet, then use that for a baseline, adjust your jetting according to a relative air density calculation....
BTW back in the day when men were men and cylinders had cast iron liners, that's basically how it was done......
CR
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East Coast Super Kart Series
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Steve O'Hara
Joined: 02 Jan 2002
Posts: 1064
Location: United States, California,
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| Posted: Tue Oct 23, 2012 12:04 am Post subject: |
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Now that this thread has come back to life after three years the real question is.... has anyone that employed the Lambda sensor on a two cycle kart engine found it to be truly useful in identifying and correcting a fuel delivery problem?
If so, please share your experiences and data.
Thanks,
Steve O'Hara |
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Chris Reinhardt
Joined: 29 Aug 2002
Posts: 2954
Location: United States, New York, Ossining
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| Posted: Tue Oct 23, 2012 5:33 am Post subject: |
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There was a thread with a guy Richard Bruckner, owner of High Gain Tuning.
They build EFI conversions for 2 stroke scooters and other 2 strokes. He uses a Lamda probe for all his tuning.....
CR
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East Coast Super Kart Series
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Chris Parks
Joined: 09 Sep 2001
Posts: 1505
Location: Australia, not USA state,
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| Posted: Tue Oct 23, 2012 6:43 am Post subject: |
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| Steve O'Hara wrote: | Now that this thread has come back to life after three years the real question is.... has anyone that employed the Lambda sensor on a two cycle kart engine found it to be truly useful in identifying and correcting a fuel delivery problem?
If so, please share your experiences and data.
Thanks,
Steve O'Hara |
We use fuel pressure for that and lambda for mixture or that was plan A. I had some debate with the experts and expressed my opinion that that fuel pressure would not work on our version of pump around and it turns out that I was right and the experts were not so that got thrown over the left shoulder. I think that fuel pressure is the correct tool for system problems. It (FP)may work on a conventional pump around as they run restrictors in the fuel line where as we don't.
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understeer happens on road courses and usually is pronounced with a British accent. Push happens on ovals and usually is pronounced through a wad of chew. Other than that, I don't think there's a difference - Jim Derrig
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joseph hollinger
Joined: 12 Sep 2002
Posts: 9536
Location: United States, California, san francisco
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| Posted: Tue Oct 23, 2012 7:21 am Post subject: |
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| Steve O'Hara wrote: | Now that this thread has come back to life after three years the real question is.... has anyone that employed the Lambda sensor on a two cycle kart engine found it to be truly useful in identifying and correcting a fuel delivery problem?
If so, please share your experiences and data.
Thanks,
Steve O'Hara |
In my experience, the Lambda data is very hard to read. Even AIM admits that you cannot look at the number in isolation and that its only valid when RPM is rising. That, combined with the fact that you cannot run it with leaded fuel (once again, my experience) makes it somewhat impractical.
I've got a detonation detector on the Honda now but I haven't spent any time testing. I'm hoping the detector does what the Lambda does not.
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Jim McMahon
Joined: 07 Apr 2007
Posts: 2787
Location: United States, St. Paul,
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| Posted: Tue Oct 23, 2012 10:32 am Post subject: |
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| Chris Reinhardt wrote: |
Actually works extremely well for different weather conditions if you recorded what the weather was when you stuck it, add one jet, then use that for a baseline, adjust your jetting according to a relative air density calculation....
BTW back in the day when men were men and cylinders had cast iron liners, that's basically how it was done......
CR |
That's a mighty big "If" there. That was my point if you went from one day to the next like that and were not monitoring air density you might end up sticking again.
Hone is cheaper than a replate thats for sure. Most of the FA motors were iron cylinders too...
Anyway, back to our regular scheduled programming.
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