Author Topic: A ballpark setup to start?  (Read 5608 times)

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Offline hiflyer727

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A ballpark setup to start?
« on: August 04, 2006, 10:54:40 pm »
From reading previous posts this is what I have gathered as a good setup to start with....Correct me in the areas I am wrong:

BP build--6" front rims with 8X8"rear rims
6" front rims with 13X6.50X6 tires
8" rear rims  with 16X7.5X8  tires
20 HP, V-Twin
700 peerless
8" Motor pulley
5" Tranny pully
Tranny sprocket---12 tooth
Axle sprocket------46 tooth
Racing in 3rd gear
Dirt Track

Thank you, Guys
Mike

Offline George Herrin

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A ballpark setup to start?
« Reply #1 on: August 05, 2006, 08:31:45 am »
looks like the basics
George Herrin #6
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Offline Squidd

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A ballpark setup to start?
« Reply #2 on: August 05, 2006, 10:29:07 am »
No, No, No...You got that all wrong.. :shock:

What you want is....

AP build--6" front rims with 6X6"rear rims
6" front rims with 13X5.5X6 tires
6" rear rims with 13X6.5X6 tires
20 HP, Built from an 8hp block....

 :twisted:

The rest of the gearing and such looks OK... :wink:
Randy Stys
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Offline George Herrin

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A ballpark setup to start?
« Reply #3 on: August 05, 2006, 11:21:22 am »
Sounds like you got Brandon building your motors. :shock:   :twisted:
George Herrin #6
Indian Power.. You gotta Go big to beat em or Go HOME
8 time ARMA National Champion
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My other racer is a 1/5th scale Dirt Late Model!!!!

Offline Squidd

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A ballpark setup to start?
« Reply #4 on: August 05, 2006, 11:31:16 am »
Dang...My "Brandon Built/Becker Buster" motor secret is out... :P
Randy Stys
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 63 Cub Cadet S/A

Offline hiflyer727

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A ballpark setup to start?
« Reply #5 on: August 05, 2006, 08:27:38 pm »
Okay.....I have the basics from which to begin, now help me with these two scenerios if you would:

1) I find that I need more torque, what in this setup would need to be changed?

2) I find that I need more topend, what in this setup would need to be changed?

Offline matt25001149

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A ballpark setup to start?
« Reply #6 on: August 05, 2006, 09:04:27 pm »
if u need more speed u add teeth on transmision sprocket and less for more tourque
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Offline George Herrin

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A ballpark setup to start?
« Reply #7 on: August 05, 2006, 09:38:55 pm »
or just the opposite if changing on the axle.
George Herrin #6
Indian Power.. You gotta Go big to beat em or Go HOME
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Offline hiflyer727

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A ballpark setup to start?
« Reply #8 on: August 06, 2006, 10:03:41 am »
Thank you very much for your insight, and help.

Offline disorderlybmxer

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A ballpark setup to start?
« Reply #9 on: August 07, 2006, 12:36:30 am »
What kind of rpms does this basic setup put into the tranny?
Tony

Offline matt25001149

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A ballpark setup to start?
« Reply #10 on: August 07, 2006, 01:33:49 am »
ok  math time :shock:

well lets get an example goin say ur motor revs at 5000 rpm full tilt no higher while under load racing and ur runnin 8-5 pulleys


 so thats 5000 rpm at the 8'' pulley now the ratio btw pulleys (8/5=1.6)so now u have an 8'' pulley spinning at 5000 rpm and a smaller 5'' pulley spining 1.6 times faster than the bigger one (5000x1.6=8000) rear pulley spins at 8000 rpm  :shock:  holy crap lmao
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Offline Squidd

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A ballpark setup to start?
« Reply #11 on: August 07, 2006, 06:15:57 am »
Yep...and just think what that little pulley is doing when your motor is turning 7500... :shock:

(not an unrealistic number... :wink: )
Randy Stys
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Offline George Herrin

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A ballpark setup to start?
« Reply #12 on: August 07, 2006, 06:59:34 am »
I do it all the time and never had a failure!!!!!
George Herrin #6
Indian Power.. You gotta Go big to beat em or Go HOME
8 time ARMA National Champion
4 time USLMRA National Champion
Retired from BP
www.herrinmowersports.yolasite.com
www.allamericanmowerchampionships.yolasite.com
My other racer is a 1/5th scale Dirt Late Model!!!!

Offline Red Horse Racing

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A ballpark setup to start?
« Reply #13 on: August 07, 2006, 05:57:35 pm »
Just think how many rpms that little 2" or 3" idler on the clutch is going when the 8" motor pulley is doing 6-7 grand or more.....

Dale
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Offline birdman_express

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A ballpark setup to start?
« Reply #14 on: August 07, 2006, 06:16:33 pm »
Quote from: Red Horse Racing
Just think how many rpms that little 2" or 3" idler on the clutch is going when the 8" motor pulley is doing 6-7 grand or more.....

Dale



3 inch 17,500 rpm's +
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