Clearly as regular sprinters we all want to go that bit faster, improve on our times and have some good old fashioned fun all without breaking ourselves, or the bike.
Yet as competitive a bunch as we are, there’s not many of us that will ever go to quite such lengths, or indeed anywhere near as fast , as Ian Turburville’s ‘Top Fuel’ Drag bike Mr. Spokehead.
Following he and his crew’s excellent ‘demo’ burnout’s at last weekend’s 1000 Bikes festival, there’s a great reason to read on and discover what it’s really like to enter the top echelons of straight line sport.
We owe Ian a big debt of gratitude for agreeing to come along this year, and while Mallory was not the place to give it full whack, below you can see a clip of the demo from you tube and also read his story about the responsibilities of owning, riding and developing this type of monster wheeled beast!
PS: See Ian and others in action in the European Drag Racing Finals in September, details HERE
Mr Spokehead - Supertwin, drag bike
Article Written By : Ian Turburville
Photo’s Courtesy : www.timtime.co.uk
Mr. Spokehead, was the internet persona of Jim McClure, of Williamsburg, Virginia. He was a champion in every way and one of the prime forces in the sport of Top-Fuel, Harley, drag racing. He was a friend, mentor and hero to me. Always an inspiration and an innovator. He and his wife, Phyllis, dedicated their lives to our sport and to winning, which they did often.
“To use a simple analogy, with just one gear, this top fuel drag bike is basically like a big ‘twist-n-go’ scooter!”
When he died it left a gaping hole in the world of drag racing and he is missed by all his fellow racers but will never be forgotten. I decided that I would build a bike that would be a fitting tribute to 'Da Judge' and in his last letter to me he said "if your gonna build another bike make sure you use an Overkill, if you don't you'll soon wish you had" ......so I did!
ABOUT THE BIKE
800 horsepower, 160 cubic inch, (2680cc) Overkill, V-Twin motor,
5" stroke, 4" bore.
1000 FT/LBS OF TORQUE
Roland / Shumaker (dual injector) heads,
Romine cams, Waterman/Kinsler pump,
Malloy fuel and clutch timers.
Dual Bill Furr injectors and controls, JIMS valve train,
Arias hemi pistons, Brooks rods,
Turboville manifolds and exhausts,
Bentec jackshaft and primary drive,
Dyna DARC Ignition, Innovate Datalogger,
GCB forks, RST/PM wheels, GMA brakes,
EK-Z triple side link chain
GATES 90mm Polychain Carbon Belt
Weekend Frame/Turboville bodywork,
Race Visions 'McClure' 96" 'Chrome-Moly' chassis
20 foot long, 2 foot wide, 675lbs. 14 inch rear slick,
98% Nitromethane, 100% Fun
10 gallons per mile!
0-100mph in just over 1 second !!!!!
2004 NAST CHAMPION TOP-FUEL BIKE
2004 SCR PAUL GIDDINGS MEMORIAL
2005 BERNIE HEPWORTH MEMORIAL
2006 SPRC CHAMPION TOP-FUEL BIKE
2006 APIRA CHAMPION TOP-FUEL BIKE
2006 ACU VICE- CHAMPION TOP-FUEL BIKE
2006 SCR/EURODRAG BEST APPEARING BIKE
2007 ACU NUMBER 2 PLATE HOLDER
2008 NSA 50 ANNIVERSARY SPRINT WINNER
2009 UEM NUMBER 9 PLATE HOLDER
About Riding a Top Fuel Drag Bike...
Or, taming the beast! How hard can it be?
There are mainly two types of top-fuel bike, supercharged four cylinder machines and massive, normally aspirated V-Twins. (there are some exotic supercharged, smaller capacity, V Twins) I ride a 2800cc, normally aspirated ‘Harley’ type bike.
“By the time you are one second into the run you are doing 100mph and pulling a couple of G’s”
Top fuel bikes have two gears, it's an epicyclic auto box shifted under full power by pressing an air button on the left handlebar at half-track!
My bike is pro-fuel, only one gear, no transmission, just twist and hang on for dear life!!! Throttle is in the usual place, right hand, but very quick action; it's either on or off! There is no clutch lever, clutches are ‘slider’ clutches that work the opposite way round to normal clutches, they are the same as the big Top Fuel Dragsters use.
Centrifugal force makes a set of weighted arms progressively engage the clutch whilst overcoming a set of adjustable springs. This process is further controlled with timers and hydraulics. So in a simple analogy it’s basically like a big ‘twist-n-go’ scooter!
Brakes are reversed however, front on the left, back on the right. That is so you can hold the front brake in the burn out but you must remember not to stop yourself with it after the burn out or you will crash.
The burn out is to heat up the massive rear slick and has to be very controlled, hold the front brake and give it half throttle until the tire starts burning then, as you feel it gripping, slowly ease off the front brake and let it go, then stop gently with the back brake. The crew chief then runs up and checks everything with a glance, inserts the throttle lock pin so he doesn’t get run over, then pushes you back to the start line.
You have to line up dead straight and in the groove of sticky rubber you just laid. The whole track has been sprayed with glue and dragged with rubber. Your crew chief is your lifeline, he starts you, lines you up, wipes your tire, checks all the time for loose bolts, fuel lines, wires, chains etc. and gives you the OK to stage then arms the computer.
By this time you have just used over a gallon of Nitromethane fuel. Ignore the crowd of 40,000 people watching you and the flashguns of the press. Focus on the tree and your opponent, the start line marshal’s are watching closely, they arm the xmas tree (the blue lights at the top) then you pre stage (first set of yellow bulbs), activate your on board computer, arm your electronic and pneumatic timers, tense every muscle including you sphincter, the motor is banging away with 3000 explosions of nitromethane every minute, the vibrations are numbing your fingers and loosening your fillings.
“As you approach 180mph, everything goes into tunnel vision”
By this stage, the noise is deafening, the nitric acid fumes from the burned nitro are also drifting up into your helmet making your eyes sting, the flames are pounding at your right leg, you wrap your right hand right round the throttle until it hurts, hold the front brake with one finger, make sure your feet are positioned so that the G force throws them onto the foot pegs and that you are dead upright.
You let your opponent stage first, flip your visor down and lock it, stage (the second set of yellow lights), hold your breath, when the three amber lights go out, NAIL THE SONOFAGUN as hard as you can. KABOOM, you are instantly at 5000rpm, maximum revs!
The world turns backwards!
The front wheel jumps in the air, the chassis comes up and whacks you in the ballistic vest you wear on your chest and you are focussed on the finish line 440yds away. The only way to describe this feeling is as if a small truck just rear-ended you at the traffic lights. The bike is pulling your arms out of their sockets, the front wheel is getting even higher as the rear tire grows another few inches in diameter.
By the time you are one second into the run you are doing 100mph and pulling a couple of G’s. The back end now feels like its on ice and it starts squirming around. Your brain gets pushed into the back of your helmet and, as you approach 180mph, everything goes into tunnel vision because your brain cannot process the information to the sides. Funnily enough this all seems like slow motion as by now your brain is working flat out on adrenaline.
“Even when slowing down, by no means must you sit up in the airstream above 150mph...it will blow you off the bike”
Steering is by keeping the bike upright at all times but leaning off it the opposite side to the way you want it to go. You must however pre-empt the correction and make your move the split second you have an inkling that it is not going straight or it will be too late. If that happens you have to kill it quick or you will be in the wall, or worse, in the other lane, mixing it up with another bike.
The cars use parachutes to scrub off a lot of speed but they have proved to be too dangerous on bikes. You must also listen to and feel the motor under your chest, if it goes too rich it will hydraulic and explode, too lean it will go into meltdown.
When you cross the finish line you have to roll off the throttle slowly to bring the front wheel down gently like a plane, then ease on the brakes and kill the fuel whilst wrestling with the monster. Twenty foot, 800lb, drag bikes are made to accelerate, not decelerate, all that weight suddenly transfers to the front wheel from the back wheel, which only has 5lb of air, stops centrifuging and turns into a nasty, wobbly, jelly, whilst the dead motor acts like a big brake.
By no means must you sit up in the airstream above 150mph, it will blow you off the bike. You have to do all the above in less than seven seconds so it is intense to say the least.
You just burned three gallons of very expensive fuel and a lot of parts! There is a drumming in your head and you realise it is your heart beating. It is quite loud when you kill the motor and the slider clutch dis-engages. You veer off the track onto the return road and stop in dead silence.
By the time you take your helmet off , you have a fixed, stupid grin on your face that won't go away and you are soaked in sweat. With shaking hands you pull the plug leads and switch off the ignition whilst checking that you haven’t lost any fuel or oil. If you have, you tell the fire crew fast in case the next racers skids on it. Time for big man hugs with your opponent as you wonder who won?
Your crew chief soon arrives on the pit bike to tow you back to your trailer where you go over the data from the run on your computer to make any tuning changes. You now have one hour to tear the motor down and check it, put in new oil, fuel, a clutch pack, four spark plugs, a drive belt, new big end shells, charge the battery and fill the air tank.
During this time you will test fire the beast to make sure it is Ok and that the clutch is biting right, you also need to of course fix anything that broke or came loose. You try to eat a hot dog and a coffee while you work. People ask you for autographs while you are under the bike, covered in oil! You try to be gracious and keep cool.
If you have a spare moment you get the hydrometer out and mix up another batch of nitro and methanol to a percentage according to weather and track conditions, hoping that you make it thru to the next round and will need it! Next thing there's a TV crew wanting an interview, so you throw on your uniform and pick the right sponsors baseball cap then try to think on your feet as they ask the unexpected question!
The hour’s passed, it’s tme to lift the bike down from it's stands, clip the bodywork back on, get the starter cart ready and charged, purge the motor of any dregs of explosive, get your leathers back on, not forgetting your ballistic vest, and wait to be called.
After race curfew and you have done all this again you can shower, have a barbeque and unwind, talk to the fans and socialise with the other racers. If you have a major breakage you might have to work all night to fix it though.
The philosophical bit...
This is what it means to ‘live’ for me and nothing is the same once you have done it. Life changes and you cannot cope with the mundane any more, the adrenaline fix is an all-powerful drug and it takes a mighty big scare to cancel its effects.
Of course all that is just 5% of drag racing. The big part is designing, building and tuning a machine that can do all this. Making it go quicker and faster occupies your every waking moment, you live in the garage, building the perfect beast.
Now that is another feeling altogether!
See you at Mallory!
More info, pictures and film on www.turboville.com
PICS FROM 1000 BIKES 2009
Picture Credit : www.timtime.co.uk : MORE HERE
Picture Credit : www.timtime.co.uk : MORE HERE
Picture Credit : www.timtime.co.uk : MORE HERE
VIEW ONE OF IAN’S REAL RACE SPEED RUNS HERE
IAN’S KEY TEAM MEMBERS ARE
CUSTOM CHROME EUROPE, RED LINE OIL, GATES BELTS, ARIAS PISTONS, CURBISHLEY AUTOMOTIVE, RUSH RACING, ZODIAC, SPRINT DAMPERS, RST WHEELS, FAST LANE RACING, KING RACING, INNOVATE DATALOGGERS. BENTEC TRANSMISSIONS, EXHAUST GAS TECHNOLOGIES, TIMTIME.CO.UK, THE CHESWORTHS. Update: Thursday, 16 July 2009 - Now Includes VIdeo of Demo CLICK HERE