Possibly because the noise of the engine is somewhat drowned out but all the
other wind, mecahnical and other road noises when under way? Try revving at
4000rpm in 1st gear and comparing it with o/d 4th.
Maximum centrifugal advance can occur anywhere from 2200rpm to 6400rpm
according to spec. For example an early high-compression 18V with a 25D4
41032 is quoted as 19 degrees at 200rpm, whereas an 18V846 or 857 with a
45D4 41610 is quoted as 24 degrees at 6400rpm.
PaulH.
----- Original Message -----
From: <BobMGT@aol.com>
To: <mgs@autox.team.net>
Sent: Friday, January 26, 2001 3:44 AM
Subject: Re: Unloaded RPM
> In a message dated 1/24/01 7:25:44 AM !!!First Boot!!!,
Lawrie@britcars.com
> writes:
>
>
> > BTW, whatever you get for full advance at 5,000 rpm is already there by
> > 3,000 (unless your distributor weights are out of whack) so let's not be
> > risking turning the engine into shrapnel by revving to 5K, unloaded,
> > unnecessarily!
> >
> >
>
> Lawrie brings up something I've always wondered about. My engine sounds
great
> running 4000 rpm on the interstate, but there's something spooky about
> revving the engine that high in neutral. Is revving the engine unloaded
bad?
> (Maybe a rule of thumb guideline here) Whenever I hear someone gunning a
> parked car it makes me cringe, but I don't know why.
>
> Bob Donahue (Still stuck in the '50s)
> EMAIL - BOBMGT@AOL.COM
> 52 MGTD - under DIY restoration NEMGTR #11470
> 71 MGB - NAMGBR #7-3336
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