A few months back, we brought you this article on Harrop Engineering’s kit to boost a traditional 8.2-inch-deck small-block Ford with a modern Roots-style supercharger — specifically the Eaton TVS 2650 supercharger. The old-school visuals of a positive-displacement supercharger on a pushrod small-block belied the impressive power output the team got from the kit.
Now, the Australian outfit has stepped it up, releasing a new variant of the kit, allowing its use on the larger 9.5-inch deck-height 351 Windsor engines. At first glance, it might seem odd that the company leading the way for one of the most American powerplants ever, is halfway across the globe. However, Australians love the Blue Oval as much as we do, and Ford fans are lucky that Harrop is interested in this powerplant.
The Potent 2650 TVS Supercharger
At the heart of the kit is the Eaton TVS 2650 supercharger unit. While it is indeed a Roots-style supercharger as opposed to a twin-screw-style positive-displacement supercharger, it is a far cry from what Roots blowers once were. The “2650” in the name is the displacement of the supercharger in cubic centimeters, or 2.65 liters. That displacement has been proven to be the sweet spot, as the 2650 core is in use across the industry on a wide variety of platforms, with great success.
The adapter plate is the key to making the inlet manifold work on the 9.5-inch deck-height engine. You can see on the right how it mounts to the heads and also acts as a valley cover.
The “TVS” in the supercharger name is probably the main key to the TVS 2650’s success. Standing for “Twin Vortices Series” the moniker denotes that the supercharger’s rotors have a 170-degree twist to them. That is not only an upgrade from the traditional straight rotors of a Roots supercharger, but an extra 10 degrees of twist over the first generation of TVS superchargers.
Additionally, the TVS 2650 redesign has led to 18 percent less input power needed, along with 25 percent increased airflow output. Couple that with an increased maximum blower speed of 18,000 rpm, and it’s no wonder the applications using the TVS 2650 make such solid power. Harrop rates the blower as capable of making 1,200-plus horsepower.
From The 5.0 To The 351
The first kit Harrop designed for the classic small-block Ford was for the venerable 8.2-inch deck-height 302 engines. While the 5.0-liter enthusiasts rejoiced, as there hasn’t been a positive-displacement supercharger kit for…
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