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Old 03-07-2013, 04:40 AM   #1
Tom Walker
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Default Gearing/revs

Standard early V8. I am working on gearing/rear end ratios....driving hard, what revs am I doing going through the gears? ie max revs in low and second.

Thanks, Tom.
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Old 03-07-2013, 06:52 AM   #2
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Default Re: Gearing/revs

Based on my experience in a tach-equipped '40 Ford with 3.78 rear end, you're probably never pulling more than 3k at the max.
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Old 03-07-2013, 07:07 AM   #3
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Default Re: Gearing/revs

Tom: PM me with your email address. I think I still have an Excel spread sheet I set up with all the available transmission and rear end gear set ups that show speed in each gear at whatever RPM and also RPM drop when shifting.
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Old 03-07-2013, 08:23 AM   #4
JM 35 Sedan
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Default Re: Gearing/revs

These links to the techno site may be of some help to you:

http://www.btc-bci.com/~billben/rpmtire.htm

http://www.flatheadv8.org/formula1.htm
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Old 03-07-2013, 01:25 PM   #5
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Default Re: Gearing/revs

Thanks for that. I saw in a spec sheet that max power was produced at 3700rpm, but had no idea if that is flat out or not.

Would 3000rpm be uncomfortable fast road revs in high gear?
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Old 03-07-2013, 04:03 PM   #6
Ken/Alabama
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Default Re: Gearing/revs

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Hi Tom, This might be of some help to you.
Attached Images
File Type: jpg img031.jpg (212.9 KB, 75 views)
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Old 03-08-2013, 06:26 AM   #7
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Default Re: Gearing/revs

Ken, That looks like the back of a Bill Widenhouse card. I bought some Columbia parts from him many years ago. He was a truely good guy. Ken
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Old 03-08-2013, 07:31 AM   #8
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Default Re: Gearing/revs

The "comfort range" for most Flathead cars, on the highway, is the 2000 to 2500 RPM area. The engine will be at the most efficient revs for better mileage and produce less noise.
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Old 03-08-2013, 08:50 AM   #9
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Default Re: Gearing/revs

Thanks John. With my 4.11:1 diff and 3.50x18 tires, 2500rpm gives 50 mph. I want to increase that a bit, so a 3.54 diff gives me just under 60mph at the same revs, which is ideal
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Old 03-08-2013, 12:54 PM   #10
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Default Re: Gearing/revs

Quote:
Originally Posted by KGS View Post
Ken, That looks like the back of a Bill Widenhouse card. I bought some Columbia parts from him many years ago. He was a truely good guy. Ken
That's exactly what it is . Bill have that to me 20 yrs ago and I laminated it. It comes in very handy at times .
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