Speed Demon Streamliner


Date Location Driver Vehicle Power Speed over
1 Km
Speed over
1 Mile
 September  17, 2012  Bonneville Salt Flats, USA Flag of the United States George Poteet   Speed Demon Streamliner IC Hellfire  439.562MPH
Piston-engined record[2] 2 or 4 stroke engine with supercharger, Category A, Group 1,  Class 10 

The vehicle was the creation of George Poteet and Ron Main, two people that had one objective for the project. They wanted to build a car that can go where few people have gone before: 400 mph.

The intimidating name of the vehicle comes as a result of having a 347- cubic-inch V8 engine that’s combined with a pair of Turbonetics "Demon" turbochargers to produce an output of 2,200 horsepower. Yikes.

So after months and months of testing and development, the team went to the Bonneville Salt Flats to give the Speed Demon a shakedown of a lifetime. With Poteet behind the wheel, the Bonneville Blown Fuel Streamliner known as the "Speed Demon" proceeded to run an astonishing 426 mph.

The engine is based on a Dart Little M block with an 8.5” deck height and splayed valve Dart Little Chief heads with an 11 degree valve angle, oval intake ports, 325cc intake ports and 50cc combustion chambers for a high compression ratio. With a 4.125” bore and 3.25” stroke, the twin turbo powered engine is designed for huge top speeds without the massive torque output you’d see in such a fearsome big block. That’s not to say that it doesn’t make plenty of torque, of course. On the dyno it puts out well over 1,200 ft./lbs. at around 8,800rpm.

The engine utilizes electronic engine management systems by MoTeC, a Hogan custom sheet metal intake manifold, Maxwell Industries stainless steel headers, a Crower billet crank with a 400ci journal, Crower billet steel I-beam rods, Diamond pistons with friction and thermal control coatings and outfitted with Total Seal gapless top rings. The valve train utilizes a highly customized grind for the Comp Cams solid roller cam. Jesel keyed roller lifters and Jesel rockers provide the proper offset geometry, while Ferrea titanium intake and inconel exhaust valves stand up to the massive friction and temperatures the monster engine subjects them to.

Land Speed Small-Block Chevy - Horsepower!

It's an LS—no wait—that's a big-block? What the hell is that thing?
By Jeff Smith, Photography by Ed Taylor
Car Craft December, 2009

1,450HP, 299ci, Short-Deck, Small-Block Chevy
Ron Main and George Poteet, Saticoy, CA
Bonneville racing is all about heavy doses of reliable horsepower. Decades ago, it took four supercharged engines in a streamliner to even consider going 400 mph. Now, Ron Main and George Poteet are planning an assault on the Salt pushed by a tiny, 299ci, small-block Chevy built by legendary turbo-engine master Kenny Duttweiler. The engine is specifically built to run in the Main & Poteet Speed Demon car that claimed fame as the first flathead-powered car to break 300 mph. Next came a Duttweiler-built Mopar four-banger Midget engine, followed by a turbocharged Duttweiler-built 2.2L GM Ecotec four-cylinder that set an SCCA record at 343.494 mph in 2008, running 390 mph out the back door. Duttweiler says this newest engine should put them close to their goal of 430 mph. That's 630 feet per second or more than the length of two football fields every second. At that speed, don't blink or you'll miss it all.

A. Intake
That's a Hogan sheetmetal intake manifold plumbed with a 90mm Wilson throttle body. The V-band clamps are an absolute necessity on the inlet side, since the turbo is capable of 50 psi. Fuel pressure is also critical because the pump must be capable of maintaining adequate pressure above the boost level.

B. Electronics
Look carefully and you'll notice a pair of 160 lb/hr injectors per cylinder. This is so Duttweiler can run the engine on either race gas (a conservative 1,211 hp) or methanol. To put that injector size in perspective, one of these 160 lb/hr injectors could easily feed a stock TPI 305 small-block Chevy. If all 16 injectors ran at 100 percent duty cycle, they could squirt nearly 400 gallons of fuel per hour. The MoTeC electronics package is also capable of running a distributorless ignition system with the MSD coils mounted on those Rat-sized valve covers.

C. Water-to-Air Intercooler
What you can't see behind the engine is a rather large water-to-air intercooler that reduces the discharge temperature out of the turbocharger. The rule of thumb is that for every 10 degrees of inlet air temperature reduction, power goes up 1 percent, so you can see why intercoolers are important.

D. Turbocharger
The engine is purposefully compact to fit inside the Speed Demon's streamliner body. The Turbonetics 117mm (4.6-inch) turbo is mounted behind the engine. Duttweiler says he twisted the turbo up to 20 psi to make the 1,450hp number. "One pound of boost is worth about 60 hp," Duttweiler says. The Turbonetics compressor map indicates that this turbo can deliver up to 50 psi, which means an additional 10 psi would be worth another 600 hp and there would still be room for more. Keep in mind that the car ran 390 mph pushing only 1,050 hp last year.

E. Heads and Valvetrain
This looks like a baby Rat because those valve covers hide a set of Dart Little Chief heads with large, 235cc rectangle ports and monstrous 2.30/1.55-inch valves. The block is designed to employ a 55mm cam core to allow Duttweiler to use a relatively short-duration camshaft that still pumps out almost 0.850 inch of valve lift using mild 1.62:1 rockers. Duttweiler says, "The lobe lift alone is more than a half inch."

F. Headers
These strange-looking headers were built by Steve Watt and are dictated by the limited width of the streamliner body. The heat shields are made of Inconel and are 3/8 inch thick to prevent heat damage to the body. According to Dutttweiler, right after a full dyno pull, his heat gun registered only 170 degrees F on the exterior of these heat shields. The streamliner's shell also features an inner lining of this same material.

G. Block
You have to look closely to see the 8.5-inch-deck Dart block buried under all the other internal combustion accoutrements. There's also a Crower steel 2.8-inch-stroke (yes, that's right) crank along with steel Crower rods pinned to a set of Diamond 9.5:1-compression pistons. With a large 4.125-inch bore, this computes to only 299 ci.

H. Motor Plate
Duttweiler says the team plans to bring last year's Ecotec engine and this Dart small-block to the Salt. The key to being able to swap between the two engines is that many of the ancillary components are bolted to the front motor plate that is designed to accommodate both engines. This makes the chassis very modular, allowing the crew to swap from the V-8 to the four-cylinder in less than 90 minutes.

I. Cylinder Pressure Sealing
You would think with all this horsepower that Duttweiler would have to jump through all kinds of flaming hoops to get the heads to seal to the block. The truth is, he bolted on a set of off-the-shelf Fel-Pro multilayer steel gaskets and dropped the heads in place. It was that simple.

SCTA Records:

D/BFS    404.562 MPH   (D/ Blown Fuel Streamliner, 299-cid engine)
C/BFS    390.709 MPH   (C/ Blown Fuel Streamliner, 347-cid engine)

Best Performance:

457 MPH flying mile one way
462 MPH trap speed
(fastest piston engine pass ever)


George Poteet

Car Owners:

George Poteet and Ron Main


C/Class Engine,  5.98  HP per cubic inch
Ken Duttweiler built small block Chevy V8
368 cubic inches
Dart Little M short deck block (8.5-inch)
Bore: 4.125-inch
Stroke: 3.400-inch
Dart 11 degree Little Chief aluminum heads
Engine management by MoTeC
2200 HP @ 8800 RPM
1313 lb-ft torque @8800 RPM

C/Class Engine,  5.978  HP per cubic inch
Ken Duttweiler built small block Chevy V8
347 cubic inches
Dart Little M 9-inch deck block (8.5-inch)
Bore: 4.125-inch
Stroke: 3.25-inch
Dart 11 degree Little Chief aluminum heads
Engine management by MoTeC
2076.6 HP @ 8800 RPM
1239.3 lb-ft torque @8800 RPM

D/Class Engine, 6.6  HP per cubic inch
Ken Duttweiler built small block Chevy V8
299 cubic inches
Dart Little M short deck block (8.5-inch)
Bore: 4.125-inch
Stroke: 2.80-inch
Dart 11 degree Little Chief aluminum heads
Engine management by MoTeC
1980 HP @9300 RPM


Twin 83mm Precision Turbo turbochargers
38-40 psi boost above 8500 RPM, Traction and driveline boost limited
below 8500 RPM
Custom Hogan sheet metal manifold with Wilson Manifolds
105mm throttle body and 16 225/hr Seimens fuel injectors (two per cylinder)
VP M1 methanol fuel


Custom tubular frame with Aerosmith Engineering designed, Nemesis Air Racing built composite body

Center Section:

Weisman quick change rearend with 1.8:1 final drive


LIberty performance Products, Extreme clutchless 5-speed