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With modern well built heads with good parts 100k is common for a bus. For lighter cars like 914's well over 100k is common. Add this to the fact that people get the rest of the engine to last for 2 or 3 100k head rebuilds and maybee piston ringings and they look very reliable to me. The oil filter extends the life of internal engine parts, the rocker shafts are bolted on so there are no clips to break, and the engine is well suited to hydraulic lifters and is designed with a proper platorm for an air conditioning compressor. The crankcase is also made of a stronger alloy... But wait These engines also seem to have more oil leaks than type1-3s. Oil galley plugs have a tendency to come loose if not replaced with threaded plugs. Valve seats will drop if not installed with a tighter interference fit than stock. Over tightening the strainer plate bolt can fatally damage the case. I have had 1 of these engines die due to valve seat failure and 2 from oil galley plug failures. If these problems were corrected I think a type4 engine is a very good investment. For 2 engines that seem so similar there are quite a few differences to consider. Josh Brooks ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org