The Cylinder Head Shop uses a Comec RP 850 utilising CBN and diamond tooling to achieve a perfect finish on cast iron and aluminium heads for two and four-stroke petrol and diesel motors.
The RP 850 is a resurfacing machine for cylinder heads and blocks of motorcycles, cars and trucks, as well as any other flat surface, which require a high …
Philip Edward Irving OBE, C.Eng., M.I.Mech.E., M.S.A.E., (1903–1992) was an Australian engineer and author, most famous for the classic engine performance guide, ‘Tuning for Speed’.
Tuning for Speed should be on the top 10 list of just about everyone’s motorcycle classic book list and has been called “one of the best books ever written on the improvement of motorcycle engines”. …
The right way to convert a cylinder heads to twin plug!
The jig that is generally available to Harley-Davidson workshops and tuners, used to convert Harley-Davidson heads to a twin spark plug set up does not provide the best solution. Whilst this promises a performance increase, the end result is not the best regarding plug position in relation to the flame …
The image to the right is an example of what can be achieved, a Triumph T120 oppositional-angle, twin-plug conversion. Such twins cylinder heads cost from £65.00. Other options offered by the Cylinder Head Shop include the use of an offset vertical relocation of the spark plugs and the use of 8mm or 10mm plugs.
Heads previously considered beyond twin-plug modification …
