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Total 18 documents matching your query.

1. MPH vs. RPM (score: 1): Author: Michael Hargreave Mawson <OC@46thFoot.com>; Date: Sat, 15 Dec 2001 10:59:04 +0000; Dear All, Having recently replaced the gearbox and speedo cable in my non O/D 1500, I have noticed that the readings I am getting on the speedo are lower for a given engine speed than hitherto. For e; /html/spitfires/2001-12/msg00252.html (9,060 bytes)
2. Re: MPH vs. RPM (score: 1): Author: "John T. Blair" <jblair@exis.net>; Date: Sat, 15 Dec 2001 08:16:18 -0500; Michael, Measure the height of the tire - the diameter from the ground to the top. The circumferance is: C= pi * D, where pi = 3.14.... Do you know the final gear ratio? Distance = RPM * final ration; /html/spitfires/2001-12/msg00258.html (9,317 bytes)
3. Re: MPH vs. RPM (score: 1): Author: Joe Curry <spitlist@gte.net>; Date: Sat, 15 Dec 2001 09:23:28 -0700; If you have the correct differential and tire sizes and the same gearbox you had before (only with the OD attached), your speedometer will not need calibration, unless it was not correct before addi; /html/spitfires/2001-12/msg00263.html (9,741 bytes)
4. Re: MPH vs. RPM (score: 1): Author: Michael Hargreave Mawson <OC@46thFoot.com>; Date: Sat, 15 Dec 2001 18:17:45 +0000; I'm using the standard 155R13s, so I hope that my answer would be the same as that for anyone with standard tyres. 1.0:1, according to the handbook. I presume that "C" in this instance doesn't stand; /html/spitfires/2001-12/msg00268.html (10,544 bytes)
5. Re: MPH vs. RPM (score: 1): Author: Michael Hargreave Mawson <OC@46thFoot.com>; Date: Sat, 15 Dec 2001 18:20:25 +0000; I have replaced a non-O/D single-rail box with an identical non-O/D single-rail box, so I would not have expected to see any alteration in the readings - hence my concern at the apparent 10% drop in; /html/spitfires/2001-12/msg00269.html (8,611 bytes)
6. Re: MPH vs. RPM (score: 1): Author: Michael Hargreave Mawson <OC@46thFoot.com>; Date: Sat, 15 Dec 2001 19:34:58 +0000; Bad form to follow up my own posting, I know, but I have just come across a programme on-line which is supposed to calculate this stuff. According to this programme (which can be found at http://pw1.; /html/spitfires/2001-12/msg00270.html (9,106 bytes)
7. Re: MPH vs. RPM (score: 1): Author: "Greg Rowe" <growe58@hotmail.com>; Date: Sat, 15 Dec 2001 16:29:57 -0500; Hi, Mike. According to a reprint of the March 1975 test by Autocar Magazine: Mph per 1000 rpm OD Top 22.6 Direct Top 18.0 OD 3rd 16.2 3rd 12.9 2nd 8.3 1st 5.1 So, 3000 rpm in 4th would be 18 X 3 whi; /html/spitfires/2001-12/msg00274.html (9,741 bytes)
8. Re: MPH vs. RPM (score: 1): Author: Alan Lemen <ralemen@cableone.net>; Date: Sat, 15 Dec 2001 14:34:14 -0700; Used to have an excel spreadsheet with 2 charts: Chart 1- road speed for engine speed Chart 2 - engine speed for road speed Both based on a standard 1976 US federal spec (my car of course) with overd; /html/spitfires/2001-12/msg00275.html (10,717 bytes)
9. Re: MPH vs. RPM (score: 1): Author: Bradley D Richardson <bradrichardson@juno.com>; Date: Sat, 15 Dec 2001 13:30:02 -0800; Our Spit sits at about 3000 RPM when at 55 MPH. Brad == ________________________________________________________________ GET INTERNET ACCESS FROM JUNO! Juno offers FREE or PREMIUM Internet access for; /html/spitfires/2001-12/msg00276.html (10,049 bytes)
10. Re: MPH vs. RPM (score: 1): Author: Michael Hargreave Mawson <OC@46thFoot.com>; Date: Sun, 16 Dec 2001 08:00:13 +0000; Thanks, Joe, but that just gives gearbox and final drive ratios (the good news is that they match the ones in the Owner's Manual). ATB -- Mike Michael Hargreave Mawson, author of "Eyewitness in the C; /html/spitfires/2001-12/msg00286.html (8,748 bytes)
11. Re: MPH vs. RPM (score: 1): Author: Michael Hargreave Mawson <OC@46thFoot.com>; Date: Sun, 16 Dec 2001 08:03:37 +0000; And it appears that my calculations were valid as well. Damn: my speedo is reading 15% low. That could get me into a lot of trouble... Thanks for clarifying that. Good idea. The consensus seems to be; /html/spitfires/2001-12/msg00287.html (9,895 bytes)
12. Re: MPH vs. RPM (score: 1): Author: Michael Hargreave Mawson <OC@46thFoot.com>; Date: Sun, 16 Dec 2001 08:04:28 +0000; Thanks for that - that confirms the theoretical speed, and means that my speedo is way out! ATB -- Mike Michael Hargreave Mawson, author of "Eyewitness in the Crimea" http://www.greenhillbooks.com/bo; /html/spitfires/2001-12/msg00288.html (8,511 bytes)
13. Re: MPH vs. RPM (score: 1): Author: Michael Hargreave Mawson <OC@46thFoot.com>; Date: Sun, 16 Dec 2001 08:08:17 +0000; The link that Joe Curry so kindly provided suggests that a US-spec car had a final drive ratio of 3.89 in Top, as opposed to our 3.63, so the figures will be slightly different. That is very kind of; /html/spitfires/2001-12/msg00289.html (9,550 bytes)
14. RE: MPH vs. RPM (score: 1): Author: "Catchpole, Pat" <Pat.Catchpole@ntc-europe.co.uk>; Date: Mon, 17 Dec 2001 09:19:58 -0000; To find a pre-calibrated bit of road look no further than your local dual carriageway. You should find a bit, generally nice and straight, where the local authority have provided 2 white blocks pain; /html/spitfires/2001-12/msg00304.html (9,475 bytes)
15. Re: MPH vs. RPM (score: 1): Author: Robert J Finnis <r.finnis@eim.surrey.ac.uk>; Date: Mon, 17 Dec 2001 11:34:40 +0000; I haven't done this with the Spitfire, but I checked the speedometer on my Rover with a handheld GPS. Drove along at a constant speed on a straight piece of road whilst a friend read off the speed o; /html/spitfires/2001-12/msg00306.html (8,458 bytes)
16. Re: MPH vs. RPM (score: 1): Author: "Laura Gharazeddine" <Laura.G@141.com>; Date: Mon, 17 Dec 2001 11:30:48 -0700; speedometer on my whilst a friend that 30 mph Don't know legally. May give if GPS has had I don't know about using a GPS, but I have been told by a couple of different people that if a speedo is off; /html/spitfires/2001-12/msg00314.html (9,563 bytes)
17. Re: MPH vs. RPM (score: 1): Author: Michael Hargreave Mawson <OC@46thFoot.com>; Date: Mon, 17 Dec 2001 19:24:34 +0000; Ah, I often wondered what those were for. I shall go and find some forthwith! ATB -- Mike Michael Hargreave Mawson, author of "Eyewitness in the Crimea" http://www.greenhillbooks.com/booksheets/eyewi; /html/spitfires/2001-12/msg00316.html (8,482 bytes)
18. Re: MPH vs. RPM (score: 1): Author: Michael Hargreave Mawson <OC@46thFoot.com>; Date: Mon, 17 Dec 2001 19:25:31 +0000; Probably. You may just find, however, that the connection at the back of the speedo gauge (or at the gearbox) is loose, and all it needs is tightening. ATB -- Mike Michael Hargreave Mawson, author of; /html/spitfires/2001-12/msg00317.html (8,136 bytes)

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