I have been doing some calculation of engine speed for different ratios. If
you have a 4.22 and are running 195-70 13 tires (the closest modern size
O.D. to the "original" radials) you should be turning 3890 RPM at 65. With
a 3.89, you are running "only" 3585 RPM. By the way, we drove faster than
65 back then for long stretches at a time. (Even though the interstate
system was fragmentary, Indiana's state highways had a speed limit of 65, so
we normally drove about 70 or so). The only difference between then and
now: it was rare for anything but the little sporty cars to have tachs, so
we had nothing to relate 3900 RPM's to. We just knew we were buzzing down
the highway.
-----Original Message-----
From: owner-alpines@autox.team.net
[mailto:owner-alpines@autox.team.net]On Behalf Of
ellis838@concentric.net
Sent: Monday, June 25, 2001 9:28 PM
To: alpines@autox.team.net
Subject: Re: Overdrives
Gauges? We don't need no stinkin gauges. My tach and speedo wave at each
other who needs them. Just speed up until you are doing the passing. Jim
Tom Yang wrote:
> Hello All,
>
> With all this talk of Overdrives, here's a question from someone without
an
> overdrive. Someday, I'll get one, but until then, does anybody know how
> fast the Series V engine is approximately turning at 65 mph? My tach
> doesn't seem to be calibrated, and changes its readings realtive to
> temperature! I doubt the Speedo is right either, but these faults I can
> live with as long as I'm not reving the engine too high...or should I just
> stay in the right lane and watch the tractor trailers pass by?
>
> Tom
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