Quote:
Originally Posted by jtbo
Modern ones have throttle butterfly, I think VW TDI engines has it too, at least some year model, but I can remember wrong too, does happen often.
I have been trying to look information about diesel and part throttle efficiency, but so far I have not found much of anything, except that Wikipedia quotation which as we all know can be false as anything in there.
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As I understand it, the Throttle plate in diesels is only used for shutdown, so when running it remains fully open, but when you shutdown, the throttle closes, which reduces the compression kick and gives a smoother shutdown.