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|19th November 2007, 12:58||#1|
Join Date: Aug 2005
Location: New Delhi
Thanked: 220 Times
Speed calculator from ratios etc
I came across this - Wallace Racing - Calculate Speed for given RPM, Rear Gear Ratio and Trans Gear Ratio
Now, RPM : no issues
Tire diameter : Tyre + rim or only Rim? for eg, if a bus has a 295/80 R22.5 tyre, then total dia will be 63.5 inches right ( .80 x 295 + .80 x 295 ) mm - convert to inches + 22.5 in + 22.5
Gear ratio : If a bus' 6th ratio is 0.83, i will input .83 for this ?
Trans gear ratio : the specs of bus say the rear axle ratio is 4.1 : 1 (shall i write this?)
I m talkin abt this bus - http://www.ceritamotors.com/ceritamo...d_brochure.pdf
|19th November 2007, 13:09||#2|
Join Date: Sep 2007
Thanked: 8 Times
Thats one hellava find Bunny.
Am just getting used to auto calculations ( they are a lot doff from the P/E ratios used in Audit firms, I guess !!! )
How did you arrive at the 4.1 : 1 final calculation. Am working it our for an Indica Turbo DLG model, incase that helps my case.
Also, am assuming that this table can be used to caliberate the ideal running speads for the rpms.
If so..under what conditions and does engine power bear no influence here..??
Any clues, please.
|19th November 2007, 14:34||#3|
Senior - BHPian
Join Date: Feb 2004
Location: Hubli - Karnata
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(9.29 x 2) + 22.5 = 41.08 inches (overall diameter).
|19th November 2007, 14:36||#4|
Join Date: Nov 2005
Thanked: 8 Times
295/80 R22.5 => 2*295*0.8+25.4*22.5 = 1043.5 mm dia of wheel
If engine RPM 1000, then wheel RPM in 6th gear
1000*(1/4.1)*0.83 = 202
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