‘Speed Demon’ clocks 462 mph at Bonneville - Hemi Truck Club
 
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Old 09-22-2011, 12:54 PM   #1
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On Tuesday, September 20, 2011, competing at Mike Cook’s Land Speed Shootout at the Bonneville Salt Flats, the “Speed Demon” streamliner of George Poteet, Ron Main and Ken Duttweiler clocked the fastest speed ever recorded for an automotive engine powered-vehicle with an entry speed of 452.944 mph, a kilometer speed of 458.189, a mile speed of 457.964 mph, and an exit speed of 462.345 mph.

The “Speed Demon” is powered by a “Hellfire” 347-cubic inch small block engine using two 82mm Precision Turbochargers burning alcohol to challenge Al Teague’s long-standing 406.321 mph FIA record. The unique “Hellfire” powerplant is designed and constructed by Duttweiler.

The 462-mph exit speed, clocked after the end of the flying mile and not valid for FIA records, exceeded the Burkland family’s 450-mph exit recorded on September 20, 2000, (using two supercharged nitro-burning Donovan Chryslers), and each intermediate time is now the fastest speed ever clocked by a wheel-driven, automotive-engined machine.

The 457-mph speed through the mile is less than two miles per hour short of the fastest ever clocked by a wheel-driven vehicle, which was recorded by the late Don Vesco’s 459.021-mph effort in the turbine-powered “Turbinator” on August 12, 2001. Vesco also holds the fastest speed ever clocked for a wheel-driven vehicle with a 470.288 mph exit speed on the same run.

On Monday, Sept. 19, Poteet clocked an entry speed of 439 mph, a kilometer speed of 442 mph, a mile speed of 442 mph and an exit speed of 446 mph on the “down run“ before breaking a rear differential on the return run. Unfortunately, the same scenario played out on Tuesday when the “Speed Demon” damaged its Liberty five-speed transmission on the return run forcing George to abort the “return” attempt.

The “Speed Demon” team also made history by breaking into the “Seven-Second Club” when on Monday’s 442 mph pass, they clocked an elapsed time for the flying mile of 8.12 seconds, but Tuesday’s 457-mph blast came with a 7.86 timeslip. The ET for the quarter-mile was 1.504 seconds! Wednesday’s attempt on the FIA-classified A/I/10 record was thwarted by engine damage after which the team decided to change engines for Thursday’s runs.

“We can’t be sure how badly we damaged the 347-inch engine,” said co-owner Ron Main from the Salt Flats, “but, by the amount of lost fluids, we can surmise it’s pretty bad. We have decided to install our similar 299 cubic-inch ‘Hellfire’ Duttweiler engine for tomorrow. If we’re successful with that engine, we still plan to install our four-cylinder turbocharged Dodge engine for an attempt on that record this week, as well.”

The team’s 299-inch “Hellfire”, another Duttweiler creation, uses the same Precision Turbos and drivetrain. The smaller engine clocked a blazing 434 mph during the 2010 Shootout and, Main adds, “that was running right against the rev-limiter.” The four-cylinder engine is a 162 cubic-inch version with a single Precision turbocharger, which screamed to 390 mph in 2010 to be come the fastest non-V8 engine in history. “We’ve built quite a bit more power into the four-cylinder Dodge for this year,” reported Main, “so we’d really like to make an attempt on that record, as well.”

Using the 347-inch “Hellfire”, the “Speed Demon” set the SCTA C/Blown Fuel Streamliner record during the 2011 SpeedWeek event recording an average speed of 390.709 mph while earning the Hot Rod Magazine trophy for the fastest mile clocked during the meet at over 426 mph. The 299-inch “Hellfire” set the D/BFS cord in 2010 at an average speed of 404.562 mph and, using the four-cylinder Dodge engine, the Poteet-Main-Duttweiler team set the F/BFS record at an average of 343.494 mph in 2008.
http://www.dragracingonline.co.../1320-xiii_9-47.html

http://www.hotrodhotline.com/f...peed_demon2010b1.pdf

http://www.hotrodhotline.com/f...andspeed_rac_11.html

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Old 09-22-2011, 12:54 PM   #2
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Quote:
On Tuesday, September 20, 2011, competing at Mike Cook’s Land Speed Shootout at the Bonneville Salt Flats, the “Speed Demon” streamliner of George Poteet, Ron Main and Ken Duttweiler clocked the fastest speed ever recorded for an automotive engine powered-vehicle with an entry speed of 452.944 mph, a kilometer speed of 458.189, a mile speed of 457.964 mph, and an exit speed of 462.345 mph.

The “Speed Demon” is powered by a “Hellfire” 347-cubic inch small block engine using two 82mm Precision Turbochargers burning alcohol to challenge Al Teague’s long-standing 406.321 mph FIA record. The unique “Hellfire” powerplant is designed and constructed by Duttweiler.

The 462-mph exit speed, clocked after the end of the flying mile and not valid for FIA records, exceeded the Burkland family’s 450-mph exit recorded on September 20, 2000, (using two supercharged nitro-burning Donovan Chryslers), and each intermediate time is now the fastest speed ever clocked by a wheel-driven, automotive-engined machine.

The 457-mph speed through the mile is less than two miles per hour short of the fastest ever clocked by a wheel-driven vehicle, which was recorded by the late Don Vesco’s 459.021-mph effort in the turbine-powered “Turbinator” on August 12, 2001. Vesco also holds the fastest speed ever clocked for a wheel-driven vehicle with a 470.288 mph exit speed on the same run.

On Monday, Sept. 19, Poteet clocked an entry speed of 439 mph, a kilometer speed of 442 mph, a mile speed of 442 mph and an exit speed of 446 mph on the “down run“ before breaking a rear differential on the return run. Unfortunately, the same scenario played out on Tuesday when the “Speed Demon” damaged its Liberty five-speed transmission on the return run forcing George to abort the “return” attempt.

The “Speed Demon” team also made history by breaking into the “Seven-Second Club” when on Monday’s 442 mph pass, they clocked an elapsed time for the flying mile of 8.12 seconds, but Tuesday’s 457-mph blast came with a 7.86 timeslip. The ET for the quarter-mile was 1.504 seconds! Wednesday’s attempt on the FIA-classified A/I/10 record was thwarted by engine damage after which the team decided to change engines for Thursday’s runs.

“We can’t be sure how badly we damaged the 347-inch engine,” said co-owner Ron Main from the Salt Flats, “but, by the amount of lost fluids, we can surmise it’s pretty bad. We have decided to install our similar 299 cubic-inch ‘Hellfire’ Duttweiler engine for tomorrow. If we’re successful with that engine, we still plan to install our four-cylinder turbocharged Dodge engine for an attempt on that record this week, as well.”

The team’s 299-inch “Hellfire”, another Duttweiler creation, uses the same Precision Turbos and drivetrain. The smaller engine clocked a blazing 434 mph during the 2010 Shootout and, Main adds, “that was running right against the rev-limiter.” The four-cylinder engine is a 162 cubic-inch version with a single Precision turbocharger, which screamed to 390 mph in 2010 to be come the fastest non-V8 engine in history. “We’ve built quite a bit more power into the four-cylinder Dodge for this year,” reported Main, “so we’d really like to make an attempt on that record, as well.”

Using the 347-inch “Hellfire”, the “Speed Demon” set the SCTA C/Blown Fuel Streamliner record during the 2011 SpeedWeek event recording an average speed of 390.709 mph while earning the Hot Rod Magazine trophy for the fastest mile clocked during the meet at over 426 mph. The 299-inch “Hellfire” set the D/BFS cord in 2010 at an average speed of 404.562 mph and, using the four-cylinder Dodge engine, the Poteet-Main-Duttweiler team set the F/BFS record at an average of 343.494 mph in 2008.
http://www.dragracingonline.co.../1320-xiii_9-47.html

http://www.hotrodhotline.com/f...peed_demon2010b1.pdf

http://www.hotrodhotline.com/f...andspeed_rac_11.html
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Old 09-22-2011, 03:27 PM   #3
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Would luv to know more about the motor.
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Old 09-22-2011, 05:32 PM   #4
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A little more info I found:
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In addition to the 300-inch engine, the team is also building a 347-incher featuring a Dart Block, Crower Crankshaft, and trick heads that have had an extra head bolt added to aid sealing in all that Duttweiler boost
http://www.bangshift.com/blog/...r-Plan-for-2010.html





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Old 09-23-2011, 07:36 AM   #5
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Thanks HB. I do see some things of interest in the pictures.
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Old 10-23-2011, 07:02 AM   #6
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Here is more info on the small block Chevy motors Poteet runs. This one is the 299 cubic inch version. The 347 cubic inch motor that clocked 462 mph is built the same. The 299 makes 1450 HP on the dyno. That means the 347 probably makes nearly 1700 HP!

http://www.carcraft.com/techar...ock_chevy/index.html
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Old 10-23-2011, 09:36 AM   #7
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Old 11-05-2011, 07:16 AM   #8
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