Its sure fun to see all the comments on the high revs of a TR-6 engine. In
particular I like the idea of worrying about a red line marked on someones
tach. I put a 7200 red line on my tach in1958 and scared half the guys in the
class out of trying to go shift for shift. Big lies are always a great help.
Red tape is cheap. I hardly ever ran it over 6300 (except in dire emergencies).
So.....the plan is a little red tape can be a definate performance boon. Oh
yeah, I really did do the 8000 with the stock (starting) crankshaft. Power
peaked at and a very nice 252 bhp. We ran engines like this quite successfully
for over a year on the same crank.
Paul Richardson wrote:
> 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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