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Original Message
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RE: Math time #2 |
By Lou - 10/23/2003 8:07:51 PM; IP 67.75.114.194 |
740 axle rpm is a costant at 60 mph. Gear ratio times 740 will give you engine RPM at 60mph. 2220 for a 3.00 gear, with a auto/trans add a little for slippage in the converter. This get you close enought for what you are looking for. lets try a 2.69 rear (very common in 58/59 Fords) 1990 at 60 + 100 rpm slippage so lets say 2100 at 60. So 2100 : 6 =350, times 7 = 2450 at 70 mph. My 57 Ford with a 292 / 2 barrel turns 2300 to 2400 at 70 and still has passing power when needed and the the engine is a lot smaller than the one in your bird, the car is a convertible so the weight is close to your T-bird. Changing the rear is a lot cheaper and easyer than installing OD and it will get you to the same place. |
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