Triumph TR2-4A Narrow Fan Belt Conversion - 4 Cylinder
As with the alternator conversion detailed above, fitting your 4 cylinder TR with a narrow fan belt is a case of choosing from the parts and kits listed here that are appropriate for your car.
There are several reasons why you should change from the original, wide belt to a narrow one; one is that of course you are always going to have more luck finding and buying a narrow belt (3/8" belts have been the standard for automotive use for many years) when you need one for servicing and repairs. THere's also the fact that being what the industry almost always specified, the narrow belt benefits from years of development to make it more efficient and reliable.
If you're feeling particularly protective towards your engine, the damped narrow belt option gives you the opportunity to protect the crankshaft by significantly reducing harmonic shock waves. This does entail the elimination of the mechanical cooling fan and fan extension and the substitution of an electric cooling fan when the original crank pulley is replaced by the new damped pulley. However, you do end up with a 'win-win' situation here because not only do you get a far better and more easily serviced fan belt on your car, but you also vastly improve the efficiency of the cooling system (the Achilles Heel of a 4 cylinder TR) too. For electric fan conversions, see "Cooling Systems'.
For owners who want a narrow belt system but don't want to go as far as losing their friendly old mechanical cooling fan, an undamped narrow belt system can be chosen instead.