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ChatMaster - 1,000
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OP
ChatMaster - 1,000
Joined: May 2005
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Can someone with a mathematical and automotive background help me with my question ? # What would be a one tooth difference 1 more or 1 less on a speedometer driven gear ? 1. miles per hour 2. revolutions per minute or percentages All opinions are welcome and are appreciated , Thank You P.K. 
Last edited by p.k.; 09/20/21 10:11 AM.
p.k.
1956 BEL AIR 2 DOOR HARDTOP
I've spent most of my money on Booze,Women and mechanical things. The rest I just Wasted........
Remember , I'm not Always Right. But I'm Never Wrong !
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Willwood Engineering
Wilwood Engineering designs and manufactures high-performance disc brake systems.
Wilwood Engineering, Inc. - 4700 Calle Bolero - Camarillo, CA 93012 - (805) 388-1188
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ChatMaster - 750
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ChatMaster - 750
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We used to figure about 2-3 mph for 1 tooth on the driven gear
Dens Chevys 1927 Speedster 1928 coupe 1941street rod 1947Fleetline 4 door 1949 1/2 ton Pickup (sold) 1954 210 4 door 1972 Monte Carlo 2003 Corvette convt..
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ChatMaster - 1,000
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ChatMaster - 1,000
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Thanks Den , I was thinking 2 mph so your answer puts on target to what I need....
p.k.
1956 BEL AIR 2 DOOR HARDTOP
I've spent most of my money on Booze,Women and mechanical things. The rest I just Wasted........
Remember , I'm not Always Right. But I'm Never Wrong !
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Joined: Feb 2002
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Backyard Mechanic
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Backyard Mechanic
Joined: Feb 2002
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Won't the reading will go as the drive ratio, or the ratio of the two numbers of teeth on the driven gear?
If n is the number of teeth you have, adding a tooth will make you read slower and the reading will be n/(n+1).
With one fewer, you should read n/(n-1), faster, since n/(n-1) is greater than n/n.
I think.
The mph changes as the ratio of numbers of teeth, so it can't be a constant number, otherwise you'd see 2mph when stopped, or -2mph, hoho.
As you get up around 100mph, the difference will become substantial, but if it's a '28 Chevy you'l have other things to worry about.
Wilson
Wilson
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ChatMaster - 1,000
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ChatMaster - 1,000
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Won't the reading will go as the drive ratio, or the ratio of the two numbers of teeth on the driven gear?
If n is the number of teeth you have, adding a tooth will make you read slower and the reading will be n/(n+1).
With one fewer, you should read n/(n-1), faster, since n/(n-1) is greater than n/n.
I think.
The mph changes as the ratio of numbers of teeth, so it can't be a constant number, otherwise you'd see 2mph when stopped, or -2mph, hoho.
As you get up around 100mph, the difference will become substantial, but if it's a '28 Chevy you'l have other things to worry about.
Wilson Yep ! Now I understand. Thank you for clearing that up. p.k.
p.k.
1956 BEL AIR 2 DOOR HARDTOP
I've spent most of my money on Booze,Women and mechanical things. The rest I just Wasted........
Remember , I'm not Always Right. But I'm Never Wrong !
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