On the early type 1 engines with the oil cooler inside the fan shroud the cooling air to #3 was bad and VW even tried to play with the timing for #3 to cool it off. Didn't work so well. Then they came up with the "dog house" cooler that made #3 get its share of air, this worked better but #3 still seemed to get it in the end. The type IV engine moved the oil cooler around so it was in front of #4 and this should have worked to even out the cooling but then they loaded up the 3-4 side of the engine with stuff like EGR, cat & funny heaters. This did not help #3 at all. The fact that all Fuel Injected type IV engines have asymetrical (un-equal path lengths from exhaust valves to tail pipe) exhaust systems can not help either. |
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