Hello Rich; By my calculations in a standard BJ8, you would be doing 103.3
miles per hour. I do think you have a problem. :-)
Details of the calculations are below and in the attached Excel spread sheet.
You can easily revise the inputs to match your car.
Good Luck.
--Scott
J. Scott Morris, Simcoe, Ontario, Canada
AH 3000 - '60 MkI BN7; '62 MkII BT7
Transmission Final Ratio
0.820
<-input
---> Gearbox ratios [o/d 4th]
Tire Diameter
25.30
<-input
---> 165/SR/15 = 25.3 inches in diameter
Rear Axle Gear Ratio
3.909
<-input
---> std / w o/d
Engine RPM
4,400
<-input
Miles per Hour
103.3
Output
RAntal243@aol.com wrote: << Greeting Healeyphiles, While cruising last night
at about 70mph in my BJ8, I noticed that the rpm's were consistently around
4400 while OD was engaged. This seems to me to be significantly higher than
usual. What rpm should one expect at those speeds and if I am correct and the
number is uncommonly high, what could be the cause? >>
J. Scott Morris - Keep Smiling, Murphy Lives
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