Lani,
I think you can run a TD engine at 3500 until the end of time. That
seems to be a reasonable speed for them.
One rule of thumb for max sustained engine speed is 2500 feet of piston
travel per minute. 2500 fpm = 30,000 inches/ min divided by 7 inches
(3.5 inch stroke x2 per revolution) = 4285 rpm. Thus 3500 rpm is running
about 82% of max cruise speed and is not flogging the engine.
Others suggest that running an engine at 75% of max rated speed is OK,
and that would be 5500 rpm x .75 = 4125 rpm.
Bob
On Fri, 14 Jan 2000 15:09:27 -0500 "Lani Spahr" <lani_spahr@agilent.com>
writes:
> Hello again all -
>
> My next question with regard to rear axle gear ratio is this: What
> is your
> opinion on cruising at 3500 RPM? Is this moderate or high? How about
> 4000?
> It seems to me that 3500 is running the engine pretty fast. This is
> one my
> reasons for wanting a different ratio.
>
> Cheers,
> Lani Spahr 1951 TD #5550
>
> Bruckner Symphony Versions Discography
> http://people.ne.mediaone.net/lspahr
>
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