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it may not 'need' a clean burn - something that 1600bar plus rail has a chance at providing, but it will be a horrible smoky thing if it can't burn the fuel efficiently.
If its smoking like they often do when they get to the 160hp mark, then they will be suffering bore wash.
If you don't mind a smoky diesel with bore wash then you don't need a high pressure rail. But having that lovely film of oil on the cylinder walls washed away by excess fuel isn't smart.
You may not need a high flowing head and more cam, you could just (for example) whack on a monster turbo and crank it up to 50psi (don't think the motor would last long tho)
But if you use intelligence then you can get power with a clean burn, with minimal lag and without dumping in either huge amounts of fuel or silly boost levels.
But you could just drop in another diesel motor that had power out of the box in the first place.
Didn't Rover have a go with the Fiat JTD motors? - was that the 45 or 75?
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