I have been rebuilding engine and gearbox's for over 30 years, Many garages shy away from rebuilding major components, instead out sourcing new or service exchange units, I am more than happy to strip, inspect and rebuild your original unit. Rebuilds carried out on most engines including the Lotus Twin cam, 907 engine used originally in the Jenson Healey right through to the 300 hp Esprit Sport 300, the Lotus V8, K series engines including VVC, Porsche air cooled engines and IMS upgrades to the later water cooled 996 and Boxster engine.
Over the past twenty years we have accumulated a vast knowledge of the Lotus Twin Cam Engine. It was originally designed by Harry Munday in 1961. For a full history and insight into the Lotus Twin Cam Engine read Miles Wilkins book "The Lotus Twin Cam Engine" if you can find a copy!
An inline four cylinder, four stroke, twin overhead camshaft unit with a cast aluminium cylinder head which has hemispherical combustion chambers and a separate ports for each valve. Based on the Ford 1500 pre-cross flow block, it was and in many ways continues to be a revelation.
There is much rubbish spoken and written about the Twin Cam, but it is still a great little power unit and there is no reason why it can't be a reliable engine which is both reasonably oil and water tight. Although it was originally designed to run on leaded fuel with the addition of hardened valve seats they will run quite happily on unleaded fuel
By the time these engines have been used for a few of decades, with limited servicing and repairs, they get very tired and dirty, they smoke badly, start poorly and are generally very unsatisfying to use. With a little time, money and dedication they can be transformed back to their former glory or perhaps better.
The Lotus 907 Engine as it has come to be known has been used in many Lotus's as well as other vehicles, its was developed at the beginning of the 70's based around the dimensions of a Vauxhall engine but with an alloy block, head and sump, with cast iron wet liners. The engine is inclined at an angle of 45 deg. lowering the centre of gravity and giving the potential for the bonnet line to be lower. The 907 engine has had an unusually long life span of nearly thirty years with power output going from 120bhp to 300hp in the Esprit Sport 300, but not only that Lotus managed to keep up with changes in emission requirements even meeting the tough requirements for California.
It started life in 1972 in the Jenson Healey in its 1973cc form, as was the way with Lotus the development of the engine was perhaps not quite completed and as a result Jenson owners suffered some reliability issues. The engine has gone onto be used in many different vehicles over the years including the Lotus Elite, Esprit, Excel and the Lotus Sunbeam, It became a 2.2 litre (2174cc) at the beginning of the eighties and eventually went back to a 2 Litre at the end of the nineties to use up the engines produced for the Italian market where engines with a capacity above 2 Litre are very heavily taxed.
Much is made of the weakness of the K series head gasket, but over the years the materials and fitment has been vastly improved, a head gasket replaced today will give many thousands of miles trouble free service.
The K series engine is a much under rated engine, it is very reliable, light and most of the components are sensibly priced, with items like pistons and liners a fraction of the price of other Lotus engines.
The K series is an engine that lends itself well to power increases. It is possible to achieve a very reliable and usable 150 to 160 hp and up to more than 200 hp for a track day or race car
All types of gearbox repairs and rebuilds under taken, including upgrades and improvements for both the Citroen and Renault gearbox's used in the Esprit
Lotus Elan diffs rebuilt and set up
Gearbox repairs and rebuilds for all Elan's including the more modern M100, Elise and Exige gearbox's repairs and rebuild also under taken