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## Re: RPM vs. MPH

 To: Rick Sorak Re: RPM vs. MPH Rick Snover Wed, 15 Mar 2006 17:32:46 -0800
 ```At 05:10 PM 3/15/2006, Rick Sorak wrote: > I was enjoying my new front shocks yesterday and driving at speeds > never before attained in my MG, and was wondering, I read somewhere > that a 1275 Midget would go 90 MPH. How? Probably not with the stock differential ratio. >...My Midget is turning 5000 RPM @ 58 MPH, according to its gauges. My cam >card says the valves float @ 6000. Are my gauges (tach, speedo) off? Quickest thing to check may be the speedo, if you can find a measured mile marked on any of the roads in your area. (There used to be a lot of "spedometer check" zones on major highways, but I haven't seen one in a long time.) Just time how long it takes to cover a known mile at a constant speed, then do the math. It should take exactly a minute at 60MPH, or two minutes at 30. I'll leave any more complicated calculations up to you. If your speedo's correct, that leaves the tach. Good luck, Rick -- Rick Snover President, Austin Healey Club of San Diego http://www.sdhealey.org 1964 Sprite Mk III (1275cc) driver, 1959 Speedwell Sprite (VARA EP #17) ```
 Current Thread RPM vs. MPH, Rick Sorak Re: RPM vs. MPH, Frank Clarici RE: RPM vs. MPH, Wm. Severin Thompson Re: RPM vs. MPH, Rick Snover <= Re: RPM vs. MPH, K. Valentine RE: RPM vs. MPH, Robert Duquette RE: RPM vs. MPH, Rick Sorak Re: RPM vs. MPH, dmeadow Re: RPM vs. MPH, Ron Soave Re: RPM vs. MPH, Robert E. Shlafer