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If you’ve spent any time around 1.9 PD engines, you’ll have heard it: "just fit an SDI cam, it’s a cheap upgrade". It’s one of those bits of advice that gets passed around so often it starts to sound like fact. But when you actually look at the camshaft data and how these engines work, it’s not quite that clear cut.This is a straightforward look at the stock PD cam, the commonly used SDI cam, and a proper performance cam, based on what the numbers actually tell us a …