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RPM/ Speed answer
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hemidenis
Posted 2011-11-19 5:29 PM (#296672)
Subject: RPM/ Speed answer



Expert

Posts: 3889
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Location: Northen Virginia		Aproximate values

Edited by hemidenis 2011-11-19 5:31 PM




(speed.jpg)



Attachments
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Attachments speed.jpg (13KB - 138 downloads)
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FIN_NV
Posted 2011-11-19 5:56 PM (#296673 - in reply to #296672)
Subject: Re: RPM/ Speed answer



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Posts: 4589
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Location: Northern New Jersey		What differential is this based on?
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hemidenis
Posted 2011-11-19 6:15 PM (#296676 - in reply to #296672)
Subject: Re: RPM/ Speed answer



Expert

Posts: 3889
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Location: Northen Virginia		1961 Models
Torqueflite for ALL models 2.93 to 1.
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Shep
Posted 2011-11-19 7:51 PM (#296688 - in reply to #296676)
Subject: Re: RPM/ Speed answer



Expert

Posts: 3400
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Location: Chestertown, NY ( near Lake George)		Seems like tire size is forgotten unless those are avg speed/rpms.
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hemidenis
Posted 2011-11-20 7:09 AM (#296733 - in reply to #296672)
Subject: Re: RPM/ Speed answer



Expert

Posts: 3889
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Location: Northen Virginia		Tire size is 9.00X14 which is New Yorker Wagon size. The speed values came from a GPS.
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Shep
Posted 2011-11-20 9:57 AM (#296768 - in reply to #296733)
Subject: Re: RPM/ Speed answer



Expert

Posts: 3400
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Location: Chestertown, NY ( near Lake George)		Did the same thing with my 55, found the speedo off about 10%, 65 read about 71 on speedo, the rpms were 2600, with 3.36 rear and 28.6 inch tires.
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59 in Calif
Posted 2011-11-20 12:12 PM (#296782 - in reply to #296672)
Subject: Re: RPM/ Speed answer


Elite Veteran

Posts: 1102
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Location: Hayward, Calif		Hemidenis, Thanks for the speed/RPM chart. Those figures are pretty much what I would have expected them to be. Gotta love those long stroke eng's ! Jerry
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hemidenis
Posted 2013-01-12 7:37 PM (#354931 - in reply to #296672)
Subject: Re: RPM/ Speed answer



Expert

Posts: 3889
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Location: Northen Virginia		i may need this to check my new tyres.
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Rodger
Posted 2013-01-13 12:02 PM (#355024 - in reply to #296672)
Subject: Re: RPM/ Speed answer


Expert

Posts: 1506
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Location: Colo Spgs		Denis and All

I like this because it is a reminder that RPM's should always be slightly below the "Max Torque" so that we have
easy power to make it up the rising hill ahead, pass that ~ who is in front ( and can not maintain their speed ) or
a battling head wind.

The era Rear Axle Ratio's - Tire Diameter - Max Torque @ such and such RPM's was all aimed at the average
Rural Max Speeds of 55 MPH. They realized this could even be applied with out changing much as the High- way
Speeds went to 75 MPH on the Rural Free Ways.

I have one Flat Head Six Cylinder Vehicle that came with 3.5's and I use Cooper 215 x 75 x 15's. A finned V8
that came to me with the optional OEM 3.2's ( 2.93 is Standard ) and I use what was then on sale 235 x 75 x 15's .

Either way I still do a lot of 65 MPH Driving because of the era's Steering Tech.



Rodger and Gabby
COS
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d500neil
Posted 2013-01-13 1:59 PM (#355041 - in reply to #355024)
Subject: Re: RPM/ Speed answer



Exner Expert 19,174 posts. Neil passed away 18 Sep 2015. You will be missed, Neil!

Posts: 19146
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Location: bishop, ca		Denis' numbers show why we want our distributors to reach full ignition advance at/prior-to/around 2500-3200 RPM.

His car has tall tires and a high gear ratio.

Most FWDLK'ers have rear gears of about 3.31-3.36-3.54 .



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