[Tom Vaught]

The subject of this thread will be about ALTERNATIVE belt driven superchargers, TWO Centrifugal SUPERCHARGERS on one engine.

Some background info:
The engine happened to be a 632 cid engine that was tested on John Meany's (The Big Stuff 3 EFI Guy) engine dyno in September of 1998. Meany's dyno 1n 1998 in Michigan was very accurate dyno. The dyno building some years later had a major fire and the building/dyno was destroyed.

The bracketry for the twin superchargers was designed and fabricated by John Carter and his contacts. The superchargers were normal rotation superchargers but mounted backward (inlets to the front and drive pulleys to the rear) with a innovative dual cog belt drive system. The crankshaft cog belt drove a jackshaft and the jack shaft drove both of the superchargers using two other cog belts.

Two supercharger systems were tested:
One system with the smaller J-Trim Vortech Superchargers and one system with the larger X-Trim Vortech Superchargers.

The dyno numbers for the smaller J-Trim system
No inter-cooling for either testing.
J-Trim Data: 1643 HP and 1300 lbs/ft of torque at 7500 rpm. 23 psi of boost

X-Trim Data: 2043 HP and 1450 lbs/ft of torque at 7500 rpm. 23 psi of boost

The people at the dyno were John Carter, John Meany, and myself (representing Vortech Supercharger Engineering as a on-site Technical Advisor for the dyno testing).

Points of the Thread:
1) Some innovation and you can make a larger engine generate some nice power numbers with much lower boost numbers vs the typical single turbo application.
2) 2000+ hp from a non-intercooled gas engine at 23 psi IN 1998 (TWENTY YEARS AGO) was quite a accomplishment.

Most Centrifugal Supercharger packages can fit under the hood (without a scoop) and make as much or more HP vs the alternative systems.
Most centrifugal superchargers require less HP to drive them for the same power level which means more HP to the tires.

Tom V.