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Hi Peter, Colin,
I am now pretty sure that the car is a fairly standard 14/60 semi tourer. It was first registered in Wimbledon on 10th March 1927. Chassis OH8643, Engine OH386. I am increasingly thinking it was the standard engine. Oil capacity of 2 gal has been mentioned. Originally believed to be Maroon. Complete history except 1937-45 and possibly one owner between 1958 and 1964. On the engine side it is good except for some valve-seat recession. I shall need to attend to that next summer. Any advice on where to get valve seat inserts done appreciated. Does it even need a specialist or can my local engineering workshop do it? (I live near Canterbury)
More posts to come about upholstery and painting.
Graham.Peter,
Thanks for that splendidly clear explanation. That is really helpful. I my have some more information after my visit on Friday.
GrahamPeter S30 wrote: Speed model with Semi-Sports body must at least be a rare combination. Especially as the Speed Model had a slightly different chassis which might cause a redesign of the body to fit. More probable that a speed model engine later was mounted in the car.
Arnold Davey in his book “2, 3 & 3 1/2 Litre in Detail” explains the development of the speed model on pages 46-63. It was presented first at the Brooklands fete in August 1927 (btw. nice photos from the Brooklands fete to be found here: http://www.austinharris.co.uk/event/lagonda-fete)
Arnold describes the changes to the engine (e.g. changes of oil supply) to make it capable of higher revs and chassis (moving the engine back by 150mm and the radiator directly above the front axle, different chassis side and cross members. These differences should make it possible to decide whether your car is a speed model or a 14/60 with speed model engine.
Armold also gives the following differences in technical data of the engine: compression 6.8 instead of 5.9, oil capacity 3 instead of 2 gallons, different valve timing (more overlap)