I am driving a 1960 Series I with a 1592 engine, 3.89 rear end, and a late
series (25 spline) overdrive. The speedo and electrics for the overdrive
are not hooked up yet. I am running standard 13 inch tires.
I can accellerate to 4800 r.p.m. in top gear (good accelleration up to
then), at which point it will go no faster. I can maintain this speed with
only an inch or so of throttle depressed, and mashing the pedal to the
floor makes no difference. I am assuming that 4800 r.p.m. is the maximum
the car is capable of in top gear, due to wind resistance, etc. According
to my owner's manual, 4800 r.p.m. is equivalent to about 83 m.p.h.
I have the following questions:
Assuming I can get the same 4800 r.p.m. in top overdrive, how fast will I
be going? The manual says 4800 r.p.m. in top overdrive is 95 m.p.h. with a
4.22 rear end. Since I have a 3.89 rear end, I should get 8% more turns of
the wheels (4.22/3.89) or 102.6 M.P.H. at the same revs.
or:
Since the overdrive will drop r.p.m. by about 20%, will the speed be 82
m.p.h. X 1.20, or 98.4 m.p.h.
Will I be able to get up to 4800 r.p.m. in o.d.?
Which of my calculations are correct, if any?
The answer is out there somewhere.
Terry McKitrick
1960 Series IB9006321LRX
St. Albert, Alberta, Canada
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