Danny Thompson, son of off-roading and land-speed legend Mickey Thompson, most recently staked his claim with Powered by a twin-turbocharged, big-block Chevy engine measuring 555 cubic inches in displacement, the Speed Demon had been especially quick in the AA/BFS class all week. A previous iteration of Speed Demon was running a small-block Chevy back then.Another piece of trivia that shouldn't be ignored is their age. They include a 300ci short stroke version, and 347, 368 and 388ci versions for different classes, all functioning reliably within a five to nearly seven horsepower per cubic inch range where even the best components are severely challenged to hold it together. The engines use 2.230 Ferrea Titanium intake valves and 1.55-inch Ferrea Inconel exhaust valves to withstand the extreme heat generated in the combustion chambers.A key factor in the Speed Demon’s amazing success is Duttweiler’s unique choice of small block engines. With the mixture kept moderately rich, the Diamond pistons tolerate this practice without distress.
It takes a lot of energy to burn that mixture and they have settled on a 250 Mj M&W ignition system with MoTeC management. Wednesday afternoon, Poteet managed a five-mile speed of 469.298 mph—Speed Demon's then-fastest speed After shredding their fair share of tires at speeds more familiar to aircraft than wheeled vehicles, the team lined up for a push in the cool morning hours. It immediately resumed its dominance at the 2016 Bonneville Speed Week by setting top speed of the meet with a 442.099-mph blast and a new 416.511-mph B/Blown Fuel Streamliner class record that secured the Hot Rod Magazine Top Speed Trophy for the 6By all commonly regarded measures, the Speed Demon’s performance defies conventional wisdom.It is a single engine, small block Chevy powered, rear-wheel drive car slaying giants in a world where heavier, multi-engine, all-wheel drive cars are assumed to enjoy a significant advantage in power, traction and control. With a robust piston and tough alloy valves, the weak link soon becomes the head gasket. There's one benchmark, though, that doesn't fall year after year—the piston-powered top speed record. The magic of controlled boost cannot be understated in this sort of application.Even with the toughest pistons on the planet, a critical element to this whole package is engine cooling.
The compression ratio with the Dart aluminum cylinder heads is nominally set at 9:1. The mechanical injectors have a high enough flow rate that the ECU can then throttle back the electronic injectors with a specified tune table that reduces the pulse width to an easily sustainable flow rate. The Speed Demon crew began the chase the following day, hitting 428.784 mph as they worked towards the 435 mph mark set by the Challenger II team. September 2011 Speed Week 2011 Speed Demon receives Hot Rod Magazine Trophy for Fastest Speed at 416.539 mph Mile 5 [Exit speed 426.910 mph] Three years in Row! Here you go folks, video directly from the Poteet and Main push truck of the Speed Demon running 410 mph. The second ring is a .043-inch Napier style and the oil groove accepts a standard tension, 1/8-inch ring. The pistons come fully treated with Diamond’s hard anodized coating and skirt treatment. Poteet, a well known hot rod builder and collector, said he was just there to take in the atmosphere at the world’s most pretigious hot rod show in the country. fuel injectors for each cylinder, augmented in each runner by a mechanical injector controlled by the ECU. Land Speed Racing is one of the last bastions of amateur motorsport, where hot rodders like Poteet can still make history. It may seem crazy that it has taken 73 years of on-and-off competition to get to the point where the 500mph mark for a piston-powered, wheel-driven vehicle may now be within reach, but such is the nature of this endeavour. Danny Thompson, son of off-roading and land-speed legend Mickey Thompson, most recently staked his claim with Powered by a twin-turbocharged, big-block Chevy engine measuring 555 cubic inches in displacement, the Speed Demon had been especially quick in the AA/BFS class all week. George Poteet’s Speed Demon has accumulated a grand total of 38 runs over 400 mph. Thompson was 69 when he set a 448.75-mph average; Poteet is 71.Other cars have gone faster in the five-mile sprint, though this is a record for internal combustion engines. That takes a pair of Seimens 225 lb. Poteet & Main Speed Demon, 439.024 MPH Monday, September 17, 2012, Wendover, Utah The Poteet and Main streamliner with George Poteet at the wheel and the world’s most powerful small block Chevy driving the wheels set new FIA International speed records in Category A, Group 1, Class 10. The Thrust SSC went 760.343 mph in 1997 and became the first car ever to break the sound barrier with the help of two Rolls-Royce jet engines. When Bonneville Speed Week rolls around, you know records will soon be set. A 14-gallon tank of iced water provides the cooling source necessary for each run. With temperatures below 70 degrees Fahrenheit and a slight breeze from the west, Speed Demon eclipsed 470 mph to lock in the record.Poteet's run was similar to Thompson's Challenger II effort in several ways. They also dominate the SCTA list of Blown Fuel Streamliner records. SCTA Records: D/BFS 404.562 MPH (D/ Blown Fuel Streamliner, 299-cid engine) C/BFS 390.709 …
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