What kind of engine is least suitable for LPG conversion?
The worst kind of engine for LPG conversion would have badly designed (soft) valve seats which will not resist Brinelling and Friction as well as harder seats would. In addition, it is known that the more similar the metals that make the valve heads and seats are, the more Microwelding will occur. Weight of the Valve Head and Stem is also as important as the hardness of the valve seats. An engine with 3 or 4 valves per cylinder is more likely to resist VSR than an engine with only 2 per cylinder, although if those 3 or 4 valve seats are soft, there will be no benefit. If the engine does not have hard valves it is wise to begin by having the valves re -engineered to the required standard using parts made of much harder material (often ‘Stellite’). In addition, an engine with single helical valve springs will suffer more Erosion due to Valve rotation. Can an Engine with Hard Valve seats be damaged? Valve damage can occur when running on any fuel. If the valves are made to run too hot due
