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Total 19 documents matching your query.

1. RPM=MPG? (Justifying OD) (score: 1): Author: Tab Julius <tab@penworks.com>; Date: Mon, 17 Jul 2000 11:52:25 -0400; I'm using my 78B for commuting at about 175 miles per day. Running 75 to 80 mph is running at about 4200 to 4500 rpm. I can have someone install OD for me for $1200 (in theory I could do it myself, b; /html/mgs/2000-07/msg00702.html (7,754 bytes)
2. RE: RPM=MPG? (Justifying OD) (score: 1): Author: "Larry Hoy" <larryhoy@prodigy.net>; Date: Mon, 17 Jul 2000 10:31:14 -0600; 82% of existing RPM No perceptible gas consumption reduction. YMMV. Larry Hoy; /html/mgs/2000-07/msg00703.html (7,667 bytes)
3. RE: RPM=MPG? (Justifying OD) (score: 1): Author: Tab Julius <tab@penworks.com>; Date: Mon, 17 Jul 2000 12:35:41 -0400; /html/mgs/2000-07/msg00704.html (7,929 bytes)
4. RE: RPM=MPG? (Justifying OD) (score: 1): Author: Tab Julius <tab@penworks.com>; Date: Mon, 17 Jul 2000 12:38:47 -0400; Actually, it sounds like it's more like YMWNV (your mileage will not vary). :) Thanks Maybe I'm just betraying my unfamiliarity with engine science, but if the engine is working 18% less, I would exp; /html/mgs/2000-07/msg00705.html (8,401 bytes)
5. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Stuart MacMillan <macmillan@home.com>; Date: Mon, 17 Jul 2000 09:56:44 -0700; You will get a slight increase in gas mileage, but just because the engine is spinning 18% slower does not mean you will get 18% better gas mileage. More like 2% or so, because the engine is still p; /html/mgs/2000-07/msg00706.html (8,733 bytes)
6. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Tab Julius <tab@penworks.com>; Date: Mon, 17 Jul 2000 12:58:59 -0400; I'll have to ask about a warranty, though these guys have a good rep to begin with (granted, the tranny may be unknown, don't know if they rebuilt it or not). I may well do it just to get rid of the; /html/mgs/2000-07/msg00707.html (9,885 bytes)
7. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Stuart MacMillan <macmillan@home.com>; Date: Mon, 17 Jul 2000 10:19:17 -0700; The later trannies are far more durable than the early ones, so chances are it is okay even without a rebuild. I suggest you have them pull the layshaft and replace it if it shows only slight or mode; /html/mgs/2000-07/msg00710.html (9,004 bytes)
8. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Tab Julius <tab@penworks.com>; Date: Mon, 17 Jul 2000 13:20:17 -0400; Thanks for the info... I'm probably going to go ahead, considering the amt of highway miles I do... Thanks again... - Tab; /html/mgs/2000-07/msg00711.html (9,585 bytes)
9. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Bob Howard <mgbob@juno.com>; Date: Mon, 17 Jul 2000 13:29:12 -0400; With OD you should get about 22 mph per 1000 rpm. 80 / 22 = 3640 rpm. I take my '72 GT to Annapolis from New Haven CT occasionally. Running at 3000 rpm gives a cruise speed of 66 mph. On this trip t; /html/mgs/2000-07/msg00716.html (9,364 bytes)
10. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Max Heim <mvheim@studiolimage.com>; Date: Mon, 17 Jul 2000 10:40:59 -0700; I think you'll like it. It does cut down on the physical wear and tear (on the driver) considerably. I personally think it improved my gas mileage, too, although maybe more at 65 than 75-80 (rarely f; /html/mgs/2000-07/msg00717.html (10,377 bytes)
11. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Charley & Peggy Robinson <ccrobins@ktc.com>; Date: Mon, 17 Jul 2000 22:26:10 -0500; Hi Stuart, Have you ever had a car that you ran over the road with overdrive and without? I ask this because you sound like you've read John Twist, who is full of brans about overdrives. CR; /html/mgs/2000-07/msg00746.html (8,469 bytes)
12. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Charley & Peggy Robinson <ccrobins@ktc.com>; Date: Mon, 17 Jul 2000 23:13:37 -0500; Hi Tab, Forget the anti-OD bunch. They just feel that way. It's like having a toothache. ODs save gas and wear. How much is according to how you drive the car and the terrain you drive it over. It al; /html/mgs/2000-07/msg00747.html (9,462 bytes)
13. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Charley & Peggy Robinson <ccrobins@ktc.com>; Date: Mon, 17 Jul 2000 23:30:44 -0500; I have a problem with that 33 mpg figure. If you're fibbing about that then ..... CR; /html/mgs/2000-07/msg00749.html (8,223 bytes)
14. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Phil Bates <jello@ida.net>; Date: Mon, 17 Jul 2000 22:47:59 -0600; I don't know about Tab and Stewart, but I have driven my MGB with a 4 synchro non-overdrive, and with a 3 synchro overdrive, and without using the overdrive. I drive 30 miles each way every day to wo; /html/mgs/2000-07/msg00750.html (10,260 bytes)
15. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Tab Julius <tab@penworks.com>; Date: Tue, 18 Jul 2000 07:00:42 -0700; More and more, it seems like OD is a sure winner. As far as vibration goes, it's not like there's a specific vibration problem, just the general problem when you take a tiny car and run its engine a; /html/mgs/2000-07/msg00754.html (8,661 bytes)
16. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Tab Julius <tab@penworks.com>; Date: Tue, 18 Jul 2000 07:05:09 -0700; Regarding wear on the engine, since so many people have mentioned it... One would think so, but last fall I asked about increased wear on the engine, or the dangers of running at 4000 to 5000 rpms co; /html/mgs/2000-07/msg00755.html (11,227 bytes)
17. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Charley & Peggy Robinson <ccrobins@ktc.com>; Date: Wed, 19 Jul 2000 12:32:34 -0500; Hi Phil, If your car isn't in good tune then your don't have any way to tell if the OD helps or not. Also, you didn't say what kind of driving the 30 miles is, or how you drive it. If the OD doesn't; /html/mgs/2000-07/msg00819.html (8,098 bytes)
18. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Charley & Peggy Robinson <ccrobins@ktc.com>; Date: Wed, 19 Jul 2000 13:44:38 -0500; Hi Tab, Good old Consensus, AKA "Everybody Knows." When I find that C or EK fly in the face of what I consider reasonable analysis, I consult textbooks & engineering manuals. Consider this: There's a; /html/mgs/2000-07/msg00820.html (8,625 bytes)
19. Re: RPM=MPG? (Justifying OD) (score: 1): Author: Phil Bates <jello@ida.net>; Date: Wed, 19 Jul 2000 18:29:48 -0600; Well officially the car is tuned very well - good compression, valves are at proper clearance, timing is correct, carbs tuned etc. BUT (that's my big butt) my MGA (with an MGB motor and rear axle rat; /html/mgs/2000-07/msg00843.html (8,824 bytes)

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