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1. RPM vs MPH question (score: 1): Author: Unknown; Date: Thu, 2 Jun 2005 00:21:27 -0400; Hey All, Is there a chart somewhere, comparing MPH to RPM? If not, then; In a Midget with a ribcase tranny, what are the corresponding rpms for the 3.7, 3.9 and 4.2 rears at 55mph? Thanks!! Kevin V; /html/spridgets/2005-06/msg00031.html (6,992 bytes)
2. Re: RPM vs MPH question (score: 1): Author: Unknown; Date: Thu, 2 Jun 2005 04:13:59 -0500 reply-type=response; If you measure the tire height in inches and use this formula you can come up with the right mph.... RPM X Tire Height divided by the rear gear divided by 336 and you come up with mph. K; /html/spridgets/2005-06/msg00033.html (7,389 bytes)
3. Re: RPM vs MPH question (score: 1): Author: Unknown; Date: Thu, 2 Jun 2005 06:43:36 -0500; There are also calculators available on the web that will calculate all this for you using the diameter of the tire. The precise tire diameter can be found at tirerack.com or sometimes the tire manuf; /html/spridgets/2005-06/msg00035.html (7,592 bytes)
4. Re: RPM vs MPH question (score: 1): Author: Unknown; Date: Thu, 2 Jun 2005 06:47:57 -0500 reply-type=original; You really need to measure the tire on the car... wear being what it is and all.... the ideal way to do it is to measure from the ground to the center of the axle and then double that number... this; /html/spridgets/2005-06/msg00036.html (7,584 bytes)
5. Re[2]: RPM vs MPH question (score: 1): Author: Unknown; Date: Thu, 2 Jun 2005 05:01:59 -0700; Hello Keith, there are some nice calculators (somewhere, i used to use one!!) on the web that will do all this for you. .. punch in tire size (175/70/13) gear ratio, and final drive ratio and it does; /html/spridgets/2005-06/msg00037.html (7,839 bytes)
6. Re: RPM vs MPH question (score: 1): Author: Unknown; Date: Thu, 2 Jun 2005 08:37:05 -0500; -- Original Message -- From "Keith Turk" <kturk at ala.net> You really need to measure the tire on the car... wear being what it is and all.... the ideal way to do it is to measure from the ground to; /html/spridgets/2005-06/msg00039.html (8,773 bytes)
7. Re: RPM vs MPH question (score: 1): Author: Unknown; Date: Thu, 2 Jun 2005 08:47:12 -0500 reply-type=original; The assumption that the tire will grow is a bit optomistic... sorry guys our cars aren' that fast... drive next to anyone on the road and look at their tires.... they aren't all bulged up like a top; /html/spridgets/2005-06/msg00040.html (8,279 bytes)
8. Re: RPM vs MPH question (score: 1): Author: Unknown; Date: Thu, 2 Jun 2005 12:15:36 -0400; I just want to know where the 336 came from?? -- Larry Macy 78 Midget Keep your top down and your chin up. Larry B. Macy, Ph.D. macy@bbl.med.upenn.edu System Manager/Administrator Neuropsychiatry Sec; /html/spridgets/2005-06/msg00041.html (9,342 bytes)
9. Re: RPM vs MPH question (score: 1): Author: Unknown; Date: Thu, 2 Jun 2005 19:41:32 -0400; Thanks to all who replied with answers and formulae. Kevin V.; /html/spridgets/2005-06/msg00056.html (7,127 bytes)
10. Re: RPM vs MPH question (score: 1): Author: Unknown; Date: Fri, 3 Jun 2005 08:23:51 -0500 reply-type=response; The 336 comes from the book on AutoMath that I have... it has worked very well over the years even in the 260 mph range... and concurs with my wheel speed sensors and the certified timing lights of t; /html/spridgets/2005-06/msg00072.html (8,101 bytes)

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