Saturday, March 05, 2016

The World's Fastest...Single!

Dennis Quinlan was kind enough to forward an email from Stuart Hooper, the arch Velocette enthusiast who's been tweaking his 650cc Velo-based motor, and this year added a supercharger! The Reilly's were spectacular, as you'll read below: 

Email from Stuart Hooper....

The Big Velo has come through another speed week with flying colours. After an initial sighting run of 177 mph which appeared ok until we discovered a nearly empty fuel tank........ Almost 10 litres of fuel used is a bit much even for its insatiable thirst.  On the next run this fuel consumption became problematical with fluctuating cylinder head temps and eventually drowning the engine which at least allowed us to identify a very unusual fuel flow problem related to our specific installation.  For the third run we upped the supercharger drive ratio and the engine ran like a clock resulting in a 188 mph average ,however the Velo was not happy with major stability issues requiring me to roll of the throttle three times through the timed miles to keep her on the track. This run however put the Velo firmly in the record books as the Worlds Fastest Single Cylinder Motorcycle . A bit of head scratching over the errant handling led to a few minor suspension changes and we were off again, this was a dream run using only half throttle and 5000rpm she passed 150 mph in a mile and then it was tuck in and twist the throttle to the stop, this time she ran straight as an arrow and the revs just kept building to 6800 at the end of the measured miles, in fact I kept the throttle wide for another untimed mile just for the hell of it and saw another 100 rpm or about 2 to 3 mph on the old Chronometric tachometer. ... Five miles absolutely flat out .... 193.061 mph. ......  The next day looked like we might crack the magic 200 mark and the officials kindly offered us an extra timed mile, but alas it was not to be. Upon close inspection the oil was discolored and coming from the breather and the crank and cush drive was suffering badly so the nitro was left unopened, a Nitro engine failure at 200mph is not high on my bucket list !     

Truly there is nothing quite like ........... A fast ride with a naked lady !!

3 comments:

Rhynchocephalian said...

Thank you Paul (and Dennis ), after hearing some light rumors it's good to hear that Stuart had a great run! I looked high and low for the past few days to see if the rumor was true but this is the first place I've heard it! Thanks again.

The Velobanjogent said...

Paul,
To avoid confusion I might comment on where Stuart's record attempt was.....it is on the Lake Gairdner salt lake in South Australia, some hundreds of km north of Adelaide and not at Bonneville which runs its speed week later in the year. The Dry Lakes Australia group have their speed week on Lake Gairdiner in late February each year. Lake Gairdner has the advantage of a much longer area of salt to run...over 25 miles I believe, whereas Bonneville is slowly being squeezed by the salt mining on one side of the lake restricting the available run to around 14 miles. both of course weather and salt surface permitting. At lake Gairdiner Mal Hewett running on gas, achieved 185.34mph (298.27kph) on his natural aspirated 1300cc Vincent (APS-VG-1350 class).
See....http://egli-vincent.net/2016/03/06/lake-gairdner-2016-185-340mph-for-vincent-and-193-061mph-for-velocette/
Congratulation to both...Stuart has closedinexorably closer to the magic 200mph mark which conditions prevailing , could be next year....

klooz said...

As Lake Gairdiner is 121 meters above sea level and Bonneville 1,286 m, it would seem Gairdiner has other advantages for the naturally aspirated.