Inventiveness of the 650, 750 & 850cfm Blow-through Mighty Demon carburetors

Inventiveness of the 650, 750 & 850cfm Blow-through Mighty Demon carburetors

If there are six centrifugal supercharger manufacturers each supplying 15 to 20 kits per week and as many turbocharger makers doing similarly, you could conclude conservatively they are producing around 750 kits per month. If you further assume that many of the buyers of those kits might be persuaded to invest $650 in a premium carburetor and avoid the high cost of converting to fuel injection—not to mention their apprehensiveness for laptop tuning—the number grows. For these cherished disciples Demon re-introduced three new Blow-through models.  By Fergus Ogilvy Dawsonville, GA: For turbocharged and centrifugal supercharged applications using a bonnet, Demon has now offers three Mighty Demon Blow-through carburetors. Operating with up to 18psi of boost they are available in 650, 750, and 850cfm. To increase the vacuum signal to the carburetor under boost and to enrich the calibration, they are equipped with annular boost venturii, large screw-in power-valve channel restrictors in the metering blocks, and 0.130in needle-and-seat valves in the fuel bowls. The bowls also contain non-collapsible solid nitrophyl floats, unlike their brass counterparts. Air bleeds are appropriately sized. These new calibrations are said to hold a flat fuel curve. Even at higher rpm the main circuits sustain constant BSFC (Brake Specific Fuel Consumption) values and air-fuel ratios. The idle circuits, which often carry the responsibility for part-throttle cruising, demonstrate fine non-boosted drivability. On the bottom side of the base plate, machined, right-angle channels are visible. These introduce a source of boost pressure to four machined grooves on the throttle shafts. This innovation seals the shafts and prevents pressure escaping from the carburetor. For security, screw-in vacuum fittings replace...

Jon Kaase, one of four top engine builders to field first Q&A Session at PRI Show.

By Archie Bosman Plan to attend this lively Q&A Session where four top engine builders covering the circle track, sprint car, dirt late model and drag racing segments will field questions from an audience of attendees. Scheduled for 8:00 – 9:00 a.m., Friday, December 13, 2013, at the Indiana Convention Center, Meeting Room 231-232 panelists include Keith Dorton (Automotive Specialists); Jon Kaase (Jon Kaase Racing Engines); Vic Hill (Vic Hill Race Engines); and Ron Shaver (Shaver Racing Engines). Theater-style seating for 200 will be available for this rare event and topics will cover “how to run a successful race engine business”, “tips of the trade”, and more. More importantly, questions can be submitted prior to the event via social media and email – look for news from the staff at PRI magazine. Kaase’s Background Jon Kaase earned a degree in mechanical engineering, created race engines that won a dozen Pro Stock championships, succeeded in winning the Engine Masters Challenge four times, and has presided over the company that bears his name for almost 34 years. Kaase, 60, started competing in drag racing while still at high school. He moved to Atlanta, Georgia at the beginning of 1977 to work for Dyno Don Nicholson and by year end celebrated the move by claiming the NHRA Pro Stock title. In November 1979 in Norcross, Georgia, he formed his own company, Jon Kaase Racing Engines. Later in 1998 he designed a purpose-built shop and moved his business to Winder, Georgia, from where the company operates today. Around 2007, the firm expanded its operations into the hot rod market when they introduced the...

Twin Street Demons and Lamar Walden’s New 409

Written by Moore Good Ink In the dyno room, Lamar Walden’s first production road-going 409 fitted with twin 625 Street Demon carburetors revved with enthusiasm to 6,293rpm and generated 602.4 peak horsepower and 602lbs-ft torque at 4,600rpm. For some, the emergence of the new Street Demon and the re-emergence of a new 409 have been the biggest hot rodding news of 2012. Earlier in a comparison test, twin Edelbrock AVS carburetors had generated a commendable 553hp @ 5,800rpm and 575lbs-ft torque @ 4,470rpm. Why had the Street Demons triumphed by 49hp and 27lbs-ft of torque? “I imagine,” said Lamar, “its supremacy lies in the size of its secondary throttles.” Unlike any conventional 4-barrel layout, the Street Demon is a three-barrel carburetor inhibited by few restrictions—the secondary throttle bore is one big opening. Read the full story compliments of Drag Racer...

THREE IRREFUTABLE POWER GAINS FROM KAASE’S NEW P38 CYLINDER HEADS FOR 302 & 351 SB FORDS

Written by Moore Good Ink Winder, Georgia: The principal power gains in Jon Kaase’s new P38 cylinder heads for Ford 302 (5 liter) and 351 small-block engines are derived from canted, larger diameter inlet and exhaust valves; improved port velocities; and deeper bowls with sweeping short turns in the intake and exhaust tracts. To accommodate the original equipment intake manifolds and exhaust headers, Kaase’s P38 aluminum cylinder heads retain the outer appearance of the original Windsor heads. But the inner surfaces reveal modern-style combustion chambers and much more. To increase air flow to the cylinders, Kaase’s P38 concept features reworked ports and canted valves, their angles altered to 8 x 4.5 degrees and 10 x 4 degrees inlet and exhaust respectively. By canting the valves in this way they open toward the center of the cylinder and the gases are less encumbered by the shrouding effect of the cylinder wall. The intake valves are increased in diameter to 2.100in and the exhaust to 1.600in. On pump fuel and barely 9:1 compression ratio, the 302 engine with Kaase P38 cylinder heads, a modest camshaft, and an Edelbrock Junior intake easily generates 500hp @ 7,500rpm. The P38 operates with slightly altered intake valve pockets on the piston crowns, narrow stud-style rockers, appropriate guide plates, and different valve covers. Optional mounting holes for larger diameter headers are provided as standard. For printable catalog fact sheet click here. For further information contact: Jon Kaase Racing Engines, Inc. 735 West Winder Ind. Parkway Winder, GA 30680 Telephone (770) 307-0241 E-mail: JonKaaseRacing@gmail.com Website at:...
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