While ProCharger fans have been drooling over the new gear-driven RaceDrive for the F-1x-12 supercharger, some prefer the time-honored belt-drive side-slinger arrangement. This 2,000-horsepower, all-alloy 540 ci built by SDPC Raceshop is destined for a TNT-built Top Dragster where real estate can be scarce.
“It was strictly fitment,” reports shop manager Alan Bracey. “The RaceDrive setup will not fit this particular customer’s dragster. But we do the RaceDrives, as well.”
As with most index-driven engines, durability, power and consistency were the key directives from the customer. The engine starts with a Brodix aluminum block bored to 4.500-inch and stuffed with Diamond 10.5:1 pistons, Callies 4.250-inch crankshaft and Oliver rods. Lubrication is provided by a Moroso wet-sump system. Other short-block goodies include ATI balancer, Jesel belt drive, Comp Cams camshaft, Isky EZ-X lifters and Manton pushrods.
“We run a wet-sump because it’s only 4.250 stroke and windage is not a problem” adds Bracy. “Also, the cost factor and fitment issue.”
The Brodix 3X cylinder heads were treated to a valve job and massaging of the combustion chamber before being fitted with Trick titanium valves and PAC springs. Williams sheet-metal valve covers hide the rocker assembly. On top is an Edelbrock intake manifold and APD carburetor that is fed by an APD belt-driven fuel pump. MSD provides the spark, and spent gasses will exit through 2.5-inch tubes to a 5-inch collector.
“The biggest reason for choosing a carb over EFI is simplification. No electronics for failure. No electric fuel pump,” explains Bracey. “We’ve had great luck with the consistency of the fuel mixture.”
Running alcohol and 16 pounds of boost from the ProCharger F-1x-12, the big Rat motor pulled 2,023 horsepower at 8,000 rpm with a very flat torque curve on the SuperFlow dyno chart.