Quote:
Originally posted by SuperHatch
Is the cylinder head on the 84 e15 turbo have a more compression on it, and larger valves? or is that an aftermarket production?
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***** Yes, it is known as the 15M head. My understanding is, that it was only sold in the US in 1983. It had smaller combustion chambers, and larger valves. Those larger valves need larger valve releifs on top of the pistons though. That's why the turbo pistons' crowns have a slightly different shape on top, to provide the necessary clearance. Nissan Motorsport sells relatively inexspensive stock replacement Euro pistons that yield 10 to 1 compression in a normally aspirated E16, [for use with the 15M head]. In other words, you can't run a turbo head on an E16 without piston to valve clearance problems, unless you get the matching pistons. I heard somwhere, of someone using a die-grinder to add the clearance into the tops of the original E16 pistons for the 15M head, but that sounds a little bit "butch" to me.
