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Bill Fenwick
Joined: 11 Oct 2001
Posts: 204
Location: United States, Texas, Canyon
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 Posted: Mon Feb 09, 2004 4:04 pm Post subject: Leopard Revs |
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I'm sure this has probably been a topic before but I searched and just couldn't find it.
For you Leopard veterans out there, what type of RPM(s) do you usually shoot for on a sprint track? |
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tim finley
Joined: 28 Jan 2003
Posts: 241
Location: United States, Arizona,
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| Posted: Mon Feb 09, 2004 6:36 pm Post subject: |
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I shout for a gearing that will give me about 15000 rpm at the end of the longest straight.
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Patrick Hubbell
Joined: 22 Jul 2001
Posts: 2546
Location: United States, California, San Jose
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| Posted: Mon Feb 09, 2004 7:27 pm Post subject: |
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let the stop watch decide for you. !5,000 is safe.
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Patrick Hubbell |
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robert pearson
Joined: 16 Sep 2003
Posts: 33
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| Posted: Mon Feb 09, 2004 10:16 pm Post subject: jim russell jr. |
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| your advice? |
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scott bertken
Joined: 14 Dec 2002
Posts: 432
Location: United States, California, tracy
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| Posted: Mon Feb 09, 2004 10:45 pm Post subject: |
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Im running 15.600 its only there for a sec. or two and it helps everywhere else on the track to be able to pull a little more gear <<little more out of the corners >just my 2 cents there are many schools of thought on this one  
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scott bertken going fast is fun and winning is funner........next time you think your perfect try walking on water |
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Jon Andrews
Joined: 25 Jul 2001
Posts: 256
Location: United States, Ohio,
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| Posted: Tue Feb 10, 2004 5:44 am Post subject: |
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| scott bertken wrote: | | Im running 15.600 its only there for a sec. or two and it helps everywhere else on the track to be able to pull a little more gear <<little more out of the corners >just my 2 cents there are many schools of thought on this one |
I have heard that due to the Leopard clutch design that the shoes are prone to failure due to metal fatigue. The magic number seems to be in the 15,500 rpm range. Are people seeing an decrease in clutch reliability when consistently gearing to go above 15,000rpm?
Thanks,
Jon.
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Jim Russell, Jr.
Advertiser
Joined: 03 Oct 2001
Posts: 1535
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| Posted: Tue Feb 10, 2004 9:00 am Post subject: |
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Jon,
RPM should have no difference on the clutches breaking. Yes there was a problem with clutches breaking. If you have a newer engine or replacement clutch you should no longer have any problems. The latest clutch is code A-120840A. The second A signifies a change in material for the steel section of the clutch. I (and the factory) have seen no failures of the A clutch. This clutch has been supplied since July '03.
For RPM 15,000 is an excellent rpm to acheive. Please make sure that when you check your gauge recall that the on track rpm and max rpm are the same. I often find that the max recall on the gauge is +300~700 rpm from hitting a bump.
If that bump is in a fast sweeper on the track I find that a lap with less max rpm on the recall ends up with a faster lap time.
Jim jr.
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Russell Karting
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Chip Durham
Joined: 29 Aug 2003
Posts: 49
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| Posted: Tue Feb 10, 2004 11:30 am Post subject: |
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| jim russell, jr. wrote: | For RPM 15,000 is an excellent rpm to acheive. Please make sure that when you check your gauge recall that the on track rpm and max rpm are the same. I often find that the max recall on the gauge is +300~700 rpm from hitting a bump.
If that bump is in a fast sweeper on the track I find that a lap with less max rpm on the recall ends up with a faster lap time.
Jim jr. |
Jim,
I have a MyChron and use the Race Studio software to analyze each run. Wouldn't a bump in the track (causing wheel spin) show as a spike on what would normally be a gradual (linear) increase in RPMs?
Does that make sense? |
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Jim Russell, Jr.
Advertiser
Joined: 03 Oct 2001
Posts: 1535
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| Posted: Tue Feb 10, 2004 1:23 pm Post subject: |
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I have used MyChron, Digatron, and PI Systems that have all had max recall rpm higher than any point you can find on the graphs or other data.
My suggestion is to use the software or playback features to look at the data and see that the rpms go from 14.8, 14.9, 15.0 (true max) vs. 15.6 on the max lookup.
Jim jr.
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Russell Karting
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Doug Ring
Joined: 30 Jul 2001
Posts: 1806
Location: United States, California, San Diego
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| Posted: Tue Feb 10, 2004 4:21 pm Post subject: |
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| Chip Durham wrote: | | jim russell, jr. wrote: | For RPM 15,000 is an excellent rpm to acheive. Please make sure that when you check your gauge recall that the on track rpm and max rpm are the same. I often find that the max recall on the gauge is +300~700 rpm from hitting a bump.
If that bump is in a fast sweeper on the track I find that a lap with less max rpm on the recall ends up with a faster lap time.
Jim jr. |
Jim,
I have a MyChron and use the Race Studio software to analyze each run. Wouldn't a bump in the track (causing wheel spin) show as a spike on what would normally be a gradual (linear) increase in RPMs?
Does that make sense? |
Yes, that is correct. We have a local track (Amago) that has a significant bump right at the fastest point of the front straight - just at the braking zone. Using Race Studio, it's easy to see a clear spike of 3-400rpm at that point, lap after lap. |
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