81 mph sounds close enough to my 88 mph. You may recall from my original
posting that I arrived at the speed using my GPS and that I had to juggle
staying on the road, reading the GPS and trying to hold the car at 4,500
rpm. A seven mph difference is well within the errors brought about using
my system.
This weekend, if we don't get the 10 inches of snow so far threatened, I'll
take someone along to read the GPS and concentrate on holding the revs
steady. I'll let you know the outcome.
--
Ciao.
Mike.
----------
>From: Bob Howard <mgbob@juno.com>
>To: mtorrusi@maine.rr.com
>Subject: Re: First hello and looking for a tonneau cover
>Date: Thu, Feb 17, 2000, 1:45 PM
>
> 18 mph per M rpm is the calculation to use with standard tires. 18 x
> 4.5 = 81 mph.
> I forget--do you have a working tach or a working speedo? Of the two, I
> think that the tach is likely to be either right on or waaay off. The
> tach is driven by electrical impulses in the distributor. There were
> different speedos used in the MGBs, depending on the OD or non OD
> application at one time, and some other variation in the cars at another.
> Since the instruments themselves will all interchange, and appear
> identical except for the tiny numbers on the face of the instrument, it's
> not unlikely that another instrument was installed in your car if the
> first one misbehaved at some point. And, since they all look alike, it
> would be easy for that someone to replace with the wrong unit.
> Someone on the list worked up a chart of which speedo fit which cars.
> I think it's in a website of one of the listers. If I can figure out
> which one, I'll let you know. Otherwise, just click onto the site, and I
> remember that it's a hyperlink address, and look up the units. Speedos
> are often available at flea markets for $5-10 , so if you find out that
> yours is not the right one, just pick up one with the right #s and swap.
>
> Bob
>
> On Thu, 17 Feb 2000 16:36:38 -0800 "Michael Torrusio"
> <mtorrusi@maine.rr.com> writes:
>> Did as you said and there is no OD -- just a straight 4 speed
>> transmission.
>> Which still leaves me with 88mph at 4,500rpm in 4th. Sound right?
>> --
>> Ciao.
>>
>> Mike.
>>
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