Bob,
Are you sure about the 2500 ft/sec? That is mighty fast for a 3.5 inch
stroke! At 7 inches per revolution that comes out at 4285 revs/sec. To
convert to rpm multiply by 60, I don't think turbines can whirl that fast.
If it's ft/min then at 18 mph/1000 rpm that's about 77 mph in a B in 4th
gear. My MG would cruise all day at 75-80 in 4th gear. It used to when the
speed limit was 70 and you wouldn't get pulled over unless you were going 15
over the limit.
Dave 72 B (Original owner)
-----Original Message-----
From: BobMGT@aol.com <BobMGT@aol.com>
To: mgs@autox.team.net <mgs@autox.team.net>
Cc: mg-t@autox.team.net <mg-t@autox.team.net>
Date: Thursday, August 03, 2000 9:31 PM
Subject: Piston Velocity
In reading some old automotive magazines articles, the term "mph at 2500
ft/sec piston velocity" came up several times. Is this supposed to the
maximum safe crusing speed for a given engine? (This is given as 60 mph for
the TD. ) If so, is it still a good rule-of-thumb for modern engines?
Bob Donahue (Still stuck in the '50s)
EMAIL - BOBMGT@AOL.COM
52 MGTD - under DIY restoration NEMGTR #11470
71 MGB - AMGBA #96-12029, NAMGBR #7-3336
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