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Old 10-03-2002, 03:52 PM
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Post Engine RPM vs Speed

Within the last year or two Street Rodder Magazine had an article that showed how to calculate engine rpm using tire size, gear ratio, transmission final ratio. Can anyone tell me what issue had that article?

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Old 10-04-2002, 07:35 AM
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I do not know of that article but if you post your specs on the board I'll calculated them for you using computer software.
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Old 10-04-2002, 10:50 AM
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I am getting ready to select a transmission, either a 350 or a 700R4, and I have a Ford 8" installed. The differental ratio is 3.00. I hate to be this much trouble but I would like to know which would be the better transmission for cruising. I would prefer the 700R4 for the OD but will this put rpm below 2000 at 65/70 mph? I plan to use a tire that is approx 27" diameter.

[ October 04, 2002: Message edited by: Bill Ford ]</p>
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Old 10-04-2002, 11:10 AM
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Go to <a href="http://www.ring-pinion.com" target="_blank">www.ring-pinion.com</a> its Randy's Ring and Pinion site. He has some good Calculators on there.
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Old 10-13-2002, 05:23 PM
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I calculated the specs as you noted in your post.

I ran the numbers on both the TH350 and the 700R4 with 27" tall tires.

These values were both calculated for RPM at 70 mph and the results were as follows:

The 700R4 will allow the engine to turn 1950 RPM @ 70 mph.

The TH350 will allow the engine to turn 2780 RPM @ 70 mph.

I simulated the different transmissions using a 1968 Camaro SS396 in stock form with the 700R4 and the 1/4 mile results were 14.25 seconds @ 95.3 mph.

The performance for the same car with the TH350 was 14.11 @ 96.3 mph.

I guess this is one of those give a little - get a little situations.

If we can be of any more assistance let me know.

Visit our website to see additional sample performance reports.

In closing, I am also from your neck of the woods.

www.pchotrod.com
pchotrod@hotmail.com

[ October 13, 2002: Message edited by: PC Hotrod ]</p>
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