Harry Weslake

Weslake Research and Development was founded by Harry Weslake, with premises in Rye, East Sussex, England.

Weslake was a cylinder head specialist who had been instrumental in modifying the side valve standard engine used in the first SS (Swallow Sidecars - later to become Jaguar) sports car. He also worked on the larger SS engine: "The 2½-litre car has an o.h.v. power-unit with Weslake combustion chambers, and gives over 40 b.h.p. per litre." He also designed the cylinder head for the overhead valve version of the Austin 'A' series engine that was used in the Morris 1000 and the Mini and received royalties on each of these engines manufactured. He was involved in the design of every Jaguar engine up to and including the V12 of the early 1970s. Weslake was also involved in the development of the Rolls-Royce Merlin engine.

In 1966 Dan Gurney commissioned Weslake Engineering to build an Aubrey Woods designed 3.0-litre V12 Formula One engine for his Eagle Mk1. Their efforts produced a V12 that was smooth and powerful. At Monza, an insight into the future of engine design was seen for the first time. The engine had four valves per cylinder at a narrow included angle (thirty degrees) that allowed a single cover to enclose both the close-spaced camshafts on each bank. The sixty-degree-vee layout had a larger bore than stroke (72.8 × 60 mm). Gurney won the Race of Champions at Brands Hatch, a non-championship event, and the 1967 Belgian Grand Prix with the Eagle-Weslake V12 engine.

At Monza in 1966, 364 bhp (271 kW) was available. This increased to 390 bhp (290 kW) during the winter. At the 1967 Brands Hatch Race of Champions, Dan Gurney's engine gave 413 bhp (308 kW) and Richie Ginther's engine gave 409 bhp (305 kW). On test, up to 422 bhp (315 kW) had been achieved. At Monaco, Gurney had 411 bhp (306 kW), Ginther 417 bhp (311 kW). Later in the 1967 season quotes of 416 bhp (310 kW) were made. (These are figures from Motoring News.) The engines peaked at around 10,000 rpm. A figure of 442 bhp (330 kW) was mentioned at the start of 1968, but after money ran out, a test made at the B.R.M. factory recorded only 378 bhp (this may have been a 'tired' engine). Harry Weslake had an eventual goal of 500 bhp (370 kW) @ 12,000 rpm. Later Ford sponsored (75.0 × 56.25 mm) versions in 1972 were quoted at 465 bhp (347 kW) @ 10,500 rpm.

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