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T600
After WW2 a larger version of the T300 engine was developed. This new engine was twice the size (600cc) and power (6hp at 1800rpm) of the T300, and was designated the T600 Mk1 (although a Mk2 was never produced). Development and testing started in 1945, but the first commercial engine was not produced until May 1946. The T600 is superficially similar in arrangement to the T300, but is fitted with sheet steel cowling to direct the cooling air around the cylinders, and external induction pipes. Magneto options and exhaust arrangements are the same as the T300, and a marine version driving a 12 inch propellor was produced. A small number of engines runnning on propane gas were also developed. Main customers remained Auto Diesels, and Thomas Green & Son. Production of the T600 continued after the company was absorbed into the Auto Diesels Braby Group, and finally finished in 1968. About 4250 T600 engines were made. For identification, serial numbers are preceded by the letter TL.

T300 Mk2
With the reduction in Ministry contracts at the end of WW2, the T300 Mk1 engine was revised slightly to improve its flexibility for a civilian market. Thus, the T300 Mk2 version was introduced in September 1945. Significant changes were made to the crankcase, including a revision of the placement of the oil filler, and provision of a platform for direct mounting of the fuel tank. The oil pressure gauge was substituted with an oil pressure indicator, non-detatchable starting handles were introduced, and cylinder heads now accepted 14mm spark plugs. Individual canister (pepper-pot) style silencers were offered as a replacement for the characteristic curved exhaust pipes and single silencer of the Mk1 engine. The magneto was changed to a BTH type MD2, and this was used interchangeably with the Wico Series A (spec A1310BZ) impluse magneto to the end of production. The carburettor remained unchanged.

The T300 Mk2 engine was bought in quantity by Auto Diesels Ltd of Uxbridge, manufacturers of electrical generating and compressor sets for the home and export markets. In addition, a marine engine version of the T300 Mk2 was offered from the start, complete with Norman's own design of stern gear with a feathering 10 inch propellor. This engine had no governors fitted, speed being controlled by throttle lever. Another significant user of the T300 Mk2 engine was Thomas Green & Son (Leeds) who used the T300 Mk2 engine in powered lawn mowers. Production of the T300 Mk2 continued after the company was absorbed into the Auto Diesels Braby Group, and finally finished in 1968. About 7500 T300 Mk2 engines were made. |last=Gallimore |first=Phillip |title=The Norman Engineering Co. Ltd. |journal=Stationary Engine Magazine |issue=98 |publisher=PPG |date=April 1982 |issn=0264-4061}}

https://www.gracesguide.co.uk/Autorman Engineering Company_Diesels

https://www.motorsportmagazine.com/archive/article/november-1925/22/bmcrc-championship-meeting