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Triumph Spitfire - Cruising Speed
|I have recently bought a non-overdrive 79, and findit sounds strained at 60-65mph. about 3800-4000rpm.|
I assume, though, that this is a safe cruising speed; I am used to a TR4a with overdrive which is much more relaxed.
What do you think?
|My '79 has the overdrive. I'm not sure that our 4th gear ratios are the same, but I don't think I'd want to cruise for hours at 3800-4000 rpm. I doubt that it will hurt the engine, but I think the noise level would get annoying. |
How is the Temperature when you run at that speed?
|T. M. Brex|
|The temp. guage on my car is always steady at 3/4 up the scale, no matter what kind of driving I do. I have an oil pressure guage and it drops a few psi aftre a few minutes at 4000rpm, but climbs again if I slow to 3800.|
In the old days Road and Track used to use 2500 feet per minute as a standard for maximum sustained cruising speed, on an engine with a stroke of 3.44 inches this would be 4360 rpm as the piston completes 2 strokes for each crank revolution, so I suppose this rpm is safe enough.
Anyway, thanks for your response!
This thread was discussed between 25/08/2004 and 27/08/2004
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