Dear FOTers
I am quite amazed at Mr J K Jackson's TR6 and I would be very interested to
learn more (and congratulate him). Has anyone spoken to him about what type
of crankshaft he's used -surely it can't be a standard configuration crank?
I know Kas Kastner ran a test TR6 engine to just over 8000 for experimental
purposes. The crank on this engine had 'weighted throws' which moved the
major oscillation out of the useable rev range. The oscillation moved to
just above 8000. Kas decided that, in any event, there was no appreciable
power developed over 7500 so he decided on this figure for his red line
(another primary oscillation at 4400 proved a bit of a worry as this
particular rev range coincided with engine speed in second gear on pace
laps!!)
An interesting comparison is the fact that the six cylinder (flat) Porsche
2 litre 910 racing engine of 1970 had a red line of 8500 to 9000 depending
on the type of race. BUT that engine had 'seven' main bearings, plenty of
metal overlap between the pins and mains and titanium rods. This engine
was, after all, designed as a Porshe racing engine. If I remember rightly
it developed 240 BHP.
If anyone knows Mr Jackson's phone number, I would be ever grateful to talk
to him and hopefully find out his secret.
Best wishes
Paul
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