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21. driving questions (score: 1): Author: karim.marouf@cancom.com; Date: Wed, 26 Nov 1997 13:28:56 -0800; When you're lugging your motor (i=2Ee=2E flooring it in too high a gear on=20= hill), how exactly are you damaging the motor (disregarding pre-ignition)?=20 Are the main bearings being damaged becaus; /html/mgs/1997-11/msg01715.html (8,025 bytes)
22. Re: driving questions (score: 1): Author: Robert Allen <boballen@sky.net>; Date: Wed, 26 Nov 1997 18:58:58 +0000; When tasking a motor on the small end of the torque curve, you are forcing the motor to generate a whole lot of extra heat. The radiator does its part but you are still super heating the oil, tops of; /html/mgs/1997-11/msg01732.html (8,788 bytes)
23. Re: driving questions (score: 1): Author: DANMAS@aol.com; Date: Fri, 28 Nov 1997 15:56:42 -0500 (EST); rpm, only To which Bob Allen replied: To which I now reply: Bob and Karim: If it's true that 90% of engine wear occurs at start-up, as has been reported, then you will wear out the engine from starti; /html/mgs/1997-11/msg01797.html (10,065 bytes)
24. Re: driving questions (score: 1): Author: "Christopher G. Moog" <cgmoog@worldnet.att.net>; Date: Fri, 28 Nov 1997 17:33:00 -0500; Thats at full throttle (highest efficiency at torque peak). At the power level needed to cruise down the highway (probably 15 - 20 hp) the most efficient is usually at lower engine speeds and greater; /html/mgs/1997-11/msg01803.html (9,019 bytes)
25. Re: driving questions (score: 1): Author: "Jerry Causey" <reecau@whidbey.com>; Date: Fri, 28 Nov 1997 19:11:47 +0800; If you're running down the freeway in an MGB at 2500 RPM in 4th OD, you probably should be more concerned with how you're going to remove the semi / lorry which is about to implant itself in the rear; /html/mgs/1997-11/msg01808.html (8,444 bytes)
26. Re: driving questions (score: 1): Author: Tyson Sherman <tsherman@tecinfo.com>; Date: Fri, 28 Nov 1997 21:17:05 -0600; Jerry is correct. 2500rpm in OD is only 55mph. At that speed I leave it in 4th regular, where it does about 3000rpms. 66 in OD = 3000rpm. So it's 22mph/1000rpm. Tyson; /html/mgs/1997-11/msg01810.html (8,161 bytes)
27. Re: driving questions (score: 1): Author: Peter Landy <plandy@idt.net>; Date: Sat, 29 Nov 1997 04:18:38 -0800; I agree that most of the wear occurs during engine startups. During shopping or other stop'n'go errands I leave the car running - providing one of my members is watching. Some might see it as a waste; /html/mgs/1997-11/msg01826.html (9,142 bytes)
28. Re: driving questions (score: 1): Author: Trevor Boicey <tboicey@brit.ca>; Date: Sat, 29 Nov 1997 04:23:24 -0500; I don't think that makes sense. The wear occurs at startup because the engine isn't lubricated. All the sitting has let the oil run off the cylinder walls and out of the bearings. If you are only sto; /html/mgs/1997-11/msg01827.html (8,797 bytes)
29. Re: driving questions (score: 1): Author: DANMAS@aol.com; Date: Sat, 29 Nov 1997 10:21:45 -0500 (EST); transmission into OD will reduce the energy required to move the car down the road, and, since an engine is most efficient at its torque peak RPM, the mechanical energy required to move the car can m; /html/mgs/1997-11/msg01836.html (11,253 bytes)
30. Re: driving questions (score: 1): Author: bugide@juno.com (Larry Dickstein); Date: Sat, 29 Nov 1997 10:50:29 EST; I'm surprised at you. Any self respecting V8 project builder ought to know that this can be answered as a 5.3 on the "GEE WHIZ" factor scale. Larry Dickstein bugide@juno.com There is no problem that; /html/mgs/1997-11/msg01842.html (9,180 bytes)
31. Re: driving questions (score: 1): Author: Chris Delling <saschris@flash.net>; Date: Thu, 27 Nov 1997 23:10:49 -0500; Dan I will agree that the difference that overdrive makes in terms of mechanical wear is probably negligible. My experience, having driven both with, and without an O.D., is that the pleasure of driv; /html/mgs/1997-11/msg01854.html (9,094 bytes)
32. Re: driving questions (score: 1): Author: Chris Delling <saschris@flash.net>; Date: Thu, 27 Nov 1997 23:23:33 -0500; Dan What I think you are assuming is that your 15-20 h.p. figure is a constant. It's not. The higher gearing provides a mechanical advantage. The engine does not have to put out as much power to move; /html/mgs/1997-11/msg01857.html (8,779 bytes)
33. Re: driving questions (score: 1): Author: DANMAS <DANMAS@aol.com>; Date: Sat, 29 Nov 1997 13:19:41 EST; (and I believe he is - thanks for the clarification, Chris), Just how much more efficient can an engine be just by dropping the rpm by 820? How much difference in throttle position is there? If it ta; /html/mgs/1997-11/msg01861.html (12,678 bytes)
34. Re: driving questions (score: 1): Author: Peter Landy <plandy@idt.net>; Date: Sat, 29 Nov 1997 15:01:01 -0800; Under given circumstances I am sure your bet would win. I knew my point of view, on this topic, would pave the path for further elaboration. To mention some of the other variables to consider is the; /html/mgs/1997-11/msg01865.html (9,023 bytes)
35. Re: driving questions (score: 1): Author: "Christopher G. Moog" <cgmoog@worldnet.att.net>; Date: Sat, 29 Nov 1997 17:45:18 -0500; snip You are correct on both counts. The efficiency gained from using an OD would probably never pay for a conversion. I would guess that the gain would be approximately 4% (an increase from 24 to 25; /html/mgs/1997-11/msg01874.html (9,287 bytes)
36. Re: driving questions (score: 1): Author: bugide@juno.com (Larry Dickstein); Date: Sat, 29 Nov 1997 19:02:29 EST; Yeah, they do, Peter, but for different reasons. Once you shut off a diesel in freezing, or below, weather you have a major job on your hands. Remember that they fire by compression, not by a spark p; /html/mgs/1997-11/msg01884.html (9,869 bytes)
37. Re: driving questions (score: 1): Author: jello@dns.ida.net (Phil Bates); Date: Sat, 29 Nov 1997 18:29:46 -0700; Better check your tach. In 4th overdrive (D-type, 3 synchro) you should do 22.3 mph/1000rpm. This comes out to about 2695rpm at 60 mph. The LH type (4 synchro) is almost the same. Now, if you are not; /html/mgs/1997-11/msg01889.html (9,630 bytes)
38. Re: driving questions (score: 1): Author: Peter Landy <plandy@idt.net>; Date: Sat, 29 Nov 1997 21:02:03 -0800; This gives us one more reason why we should consider engine swapping :-) We'll never have to restore another engine. But then how does that explain diesels are not subject to the same surface to surf; /html/mgs/1997-11/msg01892.html (8,912 bytes)
39. Re: driving questions (score: 1): Author: gofastmg@juno.com (Rick Morrison); Date: Sat, 29 Nov 1997 22:03:11 EST; SERIOUS SNIP OK Dan, I'll buy all that as soon as you convince me that (in the interests of economy, so as to not wear out the clutch release bearing and shifter forks), you never shift into 4th gear; /html/mgs/1997-11/msg01896.html (12,042 bytes)
40. Re: driving questions (score: 1): Author: DANMAS@aol.com; Date: Sat, 29 Nov 1997 22:54:49 -0500 (EST); Peter: You asked Larry, but I'll jump in here (that'll give Larry another chance to correct me!). It has been reported that as much as 90% of engine wear occurs at startup. If this is true, and the t; /html/mgs/1997-11/msg01897.html (9,736 bytes)

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