ratio

[gmcdunnah]

anyone know what the gear ratio is for a 23/43?

 

[Viper_Dave]

1.86 Just divide the larger # by the smaller #

 

[gmcdunnah]

.............

ok thank you, now i know....

 

[gmcdunnah]

.............

what will that gearing run for mph for 1000ft?

 

[Ding]

You have to calculate in your drivers, pitch, clutch and drive train efficiency, how much power you are making, and of course the conditions.

If you are running 9T x 2.52 drivers, the math theoretically says you can go 97 mph at 1:1 ratio. But that is only useful for a reference. Many factors will affect actual results.

Can you really fit a 43T in there?

If you are looking for ballpark numbers from the real world, many others here can chime in if you give more information about your setup and conditions.

 

[gmcdunnah]

................

9 th anti ratchet wahl drivers.....
straight 45 w silver rrear spring
hauck orange primary w 58 gram weights....dunno what style?
pro stock motor fully ported w mega power heads...180 lbs comp.
stock carbs no air box
no dyno numbers tho..
trackside pipes...used in asphalt racing.....
hauck programmed cdi....dnt know the mapping

i was told to run 23 43 from another guy who run 700 imp that run 122...he got out of it....

 

[tomseal6]

1.86 sounds a little steep for 1000 feet. I would actually try the stock gearing with 9 tooth drivers.

Maybe that other guy was using 10 tooth drivers with that ratio.

 

[jabber800]

RPM x top gear / bottom gear X 2.52 X driver size / 12 / 5280 X 60 = MPH at 1 to 1 ratio..

 

[needaSRX]

this is out of Olav Aaens clutching book

Engine speed x sprocket pitch diameter

MPH= --------------------------------------

Shift ratio x gearing x 336



Hope this helps