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Wes Cooley on the Dyno

14 Oct

day at the office 009While I was under the knife on Friday the Wes Cooley Special went on a visit to the dyno where the carbs were set up to suit the Chris Mayhew tuned big bore – four valve per cylinder motor. With 1160ccs to play with the final figures were pretty good for this thirty years old ‘diesel’.

A strong I45bhp at 8250rpm is not to be sniffed at and coupled with a flat torque reading in the high nineties she should be a serious contender for the Classic Series of races in South Africa early in 2014. The motor was still making good power at a self imposed for reliability reasons 8250rpm rev limit

The rider – Buffalo in his early days getting serious aboard his Yamaha TZ 750 —

51  BILL SIMPSON   YAMAHA TZ 750

He claims the twin-shock Wes Cooley special ‘handles real well’ so providing the extra thirty five horses over the original two valve motor doesn’t tie the old bike in knots she should be a potent ride.

With 145bhp showing on the graph coupled with a meaty ft/lbs of torque reading in the high nineties the boys ran out of dyno time before they could play with the ignition settings so there could even be a couple more gg’s to be teased out of the old girl yet.

The four valve per cylinder motor —

swamp donkey 031

Lookin good at Cadwell recently with only 110bhp —

DSC_2354_12.00 - 13.00

But – with the upcoming four races in three weeks at South African circuits varying in altitude from sea level at East London to the 6000ft Kylami, reliability will no doubt be more important than outright power.

One of my all-time heroes – Jim Clark – four times Grand Prix winner at Kylami wins his last ever Grand Prix at the circuit on New Year’s Day 1968 —

Jim Clark at Kylami

The talented Berwickshire farmer was to lose his life three months later at Hockenheim in a Formula Two race.

An indication as to the vagaries of carb settings required for racing in heat at altitude meant 1968 fourth place finisher Chris Amon in his Ferrari had to stop to re-fuel as he needed 54 gallons for the race distance when thirty gallons would have been enough over a similar mileage in a European GP at the time.

Wes Cooley on the Dyno

 
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Posted by on October 14, 2013 in Uncategorized

 

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