hi
TeriAnn Wakeman <twakeman@apple.com> wrote:
> The crank of the TR2-4A engine does not come with a harmonic dampener
> like most engines. The harmonics are such that the cranks have been
> known to break at the base of the flywheel flange if you spend much
> rime over 5000 RPM. The factory race & rally cars that used this
> engine were redlined at 5000 RPM. Balancing helped, and nitriding the
> crank helped more, but the destructive harmonics were still there. A
> few years ago some people (I believe from Racestorations Ltd in the
> UK) got access to the BL crank harmonic test records. They compaired
> the TR's crank harmonics with those from other cars and found a match
> in an older MG. That MG came with a dampener to decrease the crank
> harmonics.
>
I attended a talk by Graham Robson (the Triumph factory race
manager & author) earlier this year and he said that the factory broke one
crank and then decided to redline the race engines at 5000, so the 5000 rpm
limit is somewhat of a myth. Mind you, I think thats what he said
and if your engine blows ....
For what its worth, Racetorations know what they're doing & have prepared
a number of successful TR race cars.
> Frankly I wouldn't bother with a harmonic dampener unless you plan to rev
> over 5000 RPM.
> (discussion of Racetorations dampener kit).
Thats about what Robson said too.
Meanwhile: the dynamo control box on my TR4 is still "sticky", the ignition
light is reluctant to go out [ie: relay engages dynamo ]. The dynamo
seems to be producing a hefty charge. Adjusting the control box makes no
difference. Any clues?
Regards, Adrian + TR4
asj@dsbc.icl.co.uk
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