Volvo RWD 120-130 Forum

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Can anyone tell how many revolutions per mile the speedometer cable turns? 120-130

posted by  malloy1 on  Wed Apr 16 05:07 CST 2008
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last visit: Sun Oct 12 17:44 CST 2014
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Can anyone tell me how to calculate many revolutions per mile the speedometer cable turns, and/or the output shaft to a M41/J-type. I know that there is different cable drive gears.

Paul








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Can anyone tell how many revolutions per mile the speedometer cable turns? 120-130

posted by  malloy1 on  Wed Apr 16 15:57 CST 2008
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Thanks!

I did find something that stated that all speedometer drive gears are standardized to rotate at 1000 revs per mile.

I also I found how to figure out the revs per mile of the output shaft of the transmission. Basically, the number of rotations of wheel size per mile (->number of inches in a mile/circumference of the wheel size) * rear gear ratio = drive shaft revs per mile. For a 122 with a 4.1 rearend, and 165R15 tires:

800 * 4.1 = 3,300 revs per mile

The 800 was 63,400 inches per mile divide by 79.2 inches of the circumference of the 165R15 tires.

Paul








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Can anyone tell how many revolutions per mile the speedometer cable turns? 120-130

uid 32173's pic
posted by  Gary L on  Thu Apr 17 00:32 CST 2008
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last visit: Wed Oct 22 10:26 CST 2014
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"800 * 4.1 = 3,300 revs per mile"

...and therefore - with an M40 in 4th gear - 3300 engine rpm at 60 mph. :)

--

Gary L - 1971 142E ITB racer, 73 1800ES, 02 S60 T5
BlueBrick Racing








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Can anyone tell how many revolutions per mile the speedometer cable turns? 120-130

posted by  malloy1 on  Thu Apr 17 03:17 CST 2008
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Yup! That's what I get too! and with a OD (0.79 ratio) it would be 75 mph at 3300rpm.

Paul








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Can anyone tell how many revolutions per mile the speedometer cable turns? 120-130

uid 18886's pic
posted by  sdewolfe on  Wed Apr 16 06:28 CST 2008
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last visit: Mon Jan 31 05:56 CST 2011
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Paul,

The speedometer on the 122S is calibrated for .63 revs/meter. 630 revs per kilometer works out to 58 revs per mile.

I sent more information in an email.

-sd








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Can anyone tell how many revolutions per mile the speedometer cable turns? 120-130

posted by  walrus3 on  Wed Apr 16 08:24 CST 2008
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last visit: Mon Dec 2 14:20 CST 2013
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Shannon!
Czech your math - 630/km /.624km/mile = around 1009/mile.
--
George Downs, Bartlesville, Heart of the USA!








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Can anyone tell how many revolutions per mile the speedometer cable turns? 120-130

uid 18886's pic
posted by  sdewolfe on  Wed Apr 16 08:44 CST 2008
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last visit: Mon Jan 31 05:56 CST 2011
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I'm telling you; you've got to watch me every minute. ;-)
--
Mr. Shannon DeWolfe -- I've taken to using mister because my name misleads folks on the WWW. I am a 52 year old fat man. ;-)







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