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Author Topic: Final drive gearing question  (Read 1289 times)

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Offline Greg H

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Final drive gearing question
« on: July 14, 2014, 09:11:31 AM »
I know that this is one of those "how longs a piece of string " questions ::), but I'm looking for a ball park figure for my final drive gearing just to get me up and rolling .I also know that I'll probably end up with a load of sprockets like I always have in the past when I've been looking for the perfect set up on other bikes  ;D .Some facts , I'm looking for quarter mile gearing, I plan on running a 530 chain and I'm going to be running a M/T 25x7x18 rear tyre and wheelie bars   . Engine wise , well it's not built yet ::) but it will be a dedicated drag motor around the 1000/1080 mark based on an F1 motor . Cheers Greg "H"
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Offline Greg H

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Re: Final drive gearing question
« Reply #1 on: July 15, 2014, 11:47:47 PM »
O.K . I'm going with 16/50 and we'll see how it goes  ::) .
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Offline Retro Rocket

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Re: Final drive gearing question
« Reply #2 on: July 16, 2014, 02:36:14 AM »
Quote from: Greg H on July 15, 2014, 11:47:47 PM
O.K . I'm going with 16/50 and we'll see how it goes  ::) .

Greg, I still have the rear wheel of my old 750 drag bike with sprocket on it{i never raced it, just bought it}, if the engine still has the front sprocket on it i'll check for you, it was a methanol bike and pretty quick in its day, I think i have the gearing documented in the little book i got with the bike, it has every part listed including gearing....I just have to find it... :o ;)
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Offline Greg H

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Re: Final drive gearing question
« Reply #3 on: July 16, 2014, 03:10:15 AM »
Quote from: Retro Rocket on July 16, 2014, 02:36:14 AM
Quote from: Greg H on July 15, 2014, 11:47:47 PM
O.K . I'm going with 16/50 and we'll see how it goes  ::) .

Greg, I still have the rear wheel of my old 750 drag bike with sprocket on it{i never raced it, just bought it}, if the engine still has the front sprocket on it i'll check for you, it was a methanol bike and pretty quick in its day, I think i have the gearing documented in the little book i got with the bike, it has every part listed including gearing....I just have to find it... :o ;)
That would be very helpful , cheers ,Greg "H"
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Offline Bill/BentON Racing

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Re: Final drive gearing question
« Reply #4 on: July 18, 2014, 01:37:51 PM »
Samauto 16/52.  Calendar Girl 16/50! Haha  ;D Bill
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Offline Greg H

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Re: Final drive gearing question
« Reply #5 on: July 26, 2014, 05:17:26 AM »
Quote from: Bill/BentON Racing on July 18, 2014, 01:37:51 PM
Samauto 16/52.  Calendar Girl 16/50! Haha  ;D Bill
Nice one Bill  ;). 16/50 it is then ;)
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Offline 754

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Re: Final drive gearing question
« Reply #6 on: July 26, 2014, 07:50:34 AM »
I ran 17/54. On street and 1/8 mile. 16/50 should be very close to that.
 If you run that, you still have an option to run 16/54. As a choice ( i would stay away from 15 tooth)
 However with a motor your size you may be changing up to 18 tooth at the track, if you are revving too high.
 Are you planning to use all 5 gears, or going thru the traps wound out in 4th(should work on a motor with some torque)
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Offline Greg H

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Re: Final drive gearing question
« Reply #7 on: July 26, 2014, 10:09:21 AM »
Quote from: 754 on July 26, 2014, 07:50:34 AM
I ran 17/54. On street and 1/8 mile. 16/50 should be very close to that.
 If you run that, you still have an option to run 16/54. As a choice ( i would stay away from 15 tooth)
 However with a motor your size you may be changing up to 18 tooth at the track, if you are revving too high.
 Are you planning to use all 5 gears, or going thru the traps wound out in 4th(should work on a motor with some torque)
Not sure about that yet . I won't be using an air shift, so using 4th may be the better option .We'll just have to suck it an see ,  which is all part of the fun I guess  ;D ;D
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