My knowledge of two stroke diesels is limited, not withstanding, I have known for years that this was an area of internal combustion engine technology that I would, at some stage have to investigate further. I guess none of us have been able to re-visit Mike Nichols' '67 Graduate without fast forwarding to the elopement - that GM bus hauling up with the unmistakable Detroit 12 litre 32 valve V8 2 stroke roar - this lovely sound is often accentuated by the employment of a sluggish automatic gearbox playing havoc with the revs. (All of this accompanied by a rather startled look from Katherine Ross as she weighs up the pros and cons and a trickle of S&G's "Hello Darkness"). Move on 13 years and around the globe to South Australia, just West of Nundroo on the (then) very empty Eyres Highway. Quietly minding my own business on the XT500 loaded up with gear - it was getting dusk and,to give myself more chance in the kangaroo avoidance game, I had slowed to 60 and was riding straight down the centre of the road - the problem with coaches having engines at the back is you don't get to hear them coming - how I survived the Greyhound streaking past me on the near side at 80 is unknown, the noise however is etched securely in my brain somewhere - glorious two stroke rattle and howl, FANTASTIC smell and heat. Move on again - another 5 years and I found myself driving a Commer CDY (as shown below) tipper, only for a day, but the noise ! Obviously I knew I was in stroker territory but for some reason never looked under the bonnet. I have only just discovered the brilliant opposing piston design of the Rootes TS3 !?%&£$!!? BRILLIANT - 3 cylinders, 6 pistons, 12 con-rods, 6 rockers and 1 crankshaft - all that and a stroker to boot. How this piece of engineering has passed me by for so long is a mystery, I'm just glad I found it now before it's too late. Apparently the little 215 cube (3523cc) motor was producing 335 lbs.ft of torque at 1200 revs ! MORE FROM LESS !
STOP PRESS - if you need to know what a TS3 sounds like - watch this !
News of Chris Carr's record busting last week (367.382mph) caused me to wonder just how far this art can be refined. One of the biggest restricting factors in the battle for two wheeled LSR domination is the very tight space the power unit has to fit in - 28x18 inches by the rules. Power is what's needed, if you reckon on power requirements climbing at the cube of the speed increase sought you won't be far off. So for a 10% increase in speed we need a 33% (1.1 cubed = 1.33) increase in power - this rather crude formula assumes "all other things remaining equal", well of course they don't, developing more power will no doubt require a heavier motor, stronger frame etc etc and a few too many pancakes for breakfast could ruin things. In '56 a streamliner 650 managed a staggering 214mph with an estimated 80bhp on tap (another dirt track rider). Chris's speed last week is near as damn it 71.53% faster than Johnny Allen's 214.17mph - so: 1.7153 cubed X 80 bhp = 403.75 bhp. BUB racing have managed to get 500 horsepower out of this tiny compartment. It is considered desirable to run a "big bang" motor and take advantage of the power pulses, I guess traction is a massive issue given the single tyre footprint and the loose surface. I couldn't resist the photos (robbed from BUB Racing's website). 3000cc, turbocharged, four cam, 16 valve, methanol-gulping V4 producing 500bhp @ 8500rpm - AND - 400ft/lb of torque ! 
Some how the tidy shot of the component parts makes the engineering look very clinical and lifeless in contrast to the shot of the beast assembled and plumbed in - imagine the racket. MORE SALT !
