I'd be curious to hear from some of the more knowledgable posters
regarding this subject. I would have assumed the redline would have
more to do with valve float, piston centrifugal forces, crank whip, etc.
than with cooling capacity. I wouldn't think the cooling would be able
to keep up with any engine running at redline continuously. ie, the
cooling system would rely on the thermal inertia of the engine to keep
temps down during occasional ventures into the high RPM's.
Matt
Gordon Bird wrote:
>
> The tach on my A has a 'yellow' line at 5500 rpm and the redline
> at 6000. I do have the original tach in place. Oh yeh, I do have an oil
> cooler.
> Gordie Bird
> 62 MGA
>
> **>**>Deal List:
> **>**>
> **>**>This whole discussion makes one wonder about the meaning of the
> **>**>redline is,
> **>**>anyway. I assume it represented the point at which the cooling
> **>**>system could
> **>**>no longer dissipate heat at the rate that the engine produces
> **>**>it. However,
> **>**>in going through boxes and piles of used guages at different LBC
> **>**>events, it
> **>**>seemed that they all pretty much had the same redline at about
> **>**>5500. Every
> **>**>single one had the same redline, although the tachs were
> **>**>allegedly for all
> **>**>sorts of different marques with widely varying engines.
> **>**>
> **>**>I now suspect that the tachometer backgrounds were all printed
> **>**>by the same
> **>**>printer at the same time by Smiths, and BMC just ordered them
> **>all. Thus
> **>**>regardles of where the engine should top out, all MG's seem
> **>to have about
> **>**>the same redline. (They didn't alter the tach on cars with an
> **>**>oil cooler,
> **>**>did they?)
> **>**>
> **>**>Regards,
> **>**>
> **>**>Charles
> **>**>'74 Midget
> **>**>cdsorkin@ix.netcom.com
> **>**>Bloomfield, NJ
> **>**>
> **>
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