Carl Heideman
Carl Heideman
12/3/08 1:10 p.m.

Supercharging has been a part of the British car scene for a long time. From factory-built Blower Bentleys and supercharged MGs of the 1920s and 1930s to aftermarket offerings from Judson, Marshall, Shorrock, Wade and others in the 1950s and ’60s, many British cars have relied on force-fed power. So it only makes sense that Moss Motors is reviving the tradition of blown British cars.

A few years back, Moss came out with an aftermarket supercharger kit for the MG-TD. Similar in appearance to the Marshall units available in the past, the Moss kit features a modern Eaton supercharger for higher efficiency and better drivability.

Now Moss has come out with a more mainstream product, releasing a supercharger for the MGB. Following the formula and experience derived from the T-series kit, Moss has adapted an Eaton M-45 supercharger unit for use with the MGB’s 1798cc four-cylinder B-series engine. Currently there are two versions of the supercharger available: one for the 1968-’74 chrome-bumper cars, and another for the later rubber-bumper cars. Early MGB and MGA kits are looming on the horizon.

We obtained one of the first Moss supercharger kits and got to see if there was power behind all the mythology. We bolted the kit onto our 1978 MGB test mule and put it through its paces. First, we ran the kit straight out of the box as delivered from Moss. Then we pushed it further with more boost, more camshaft and an improved cylinder head. We ran it on the dynamometer every step of the way, and now we can report on it.

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