Originally Posted by Big Evil
M52 no vanos
M52TU single vanos (that was the TU) according to BMW themselves (factory literature) when I went there for tech school. I'm looking at an M52TU in my E34 as I type and it is single vanos. Double vanos happened on the M54 engine which was made up until a few years ago. All good engines.
Regardless it doesn't change the question
.7mm isn't terribly significant but it will improve flow through the engine which is what you're after as more air and fuel with more compression equals bigger bang and more power. Taller pistons with more valve lift COULD be an issue but shouldn't cause much concern as long as you get the tolerances and timing correct.
Have you built engines before? You need to know the deck clearance of the pistons with the connecting rods and bearings you want to use. The thickness of the head gasket you're planning to use. Do some addition and subtraction to see how the will jive with your valve lift. It's not difficult but it MUST be correct or you'll destroy all you hard work the first time you crank it over.
Just out of curiosity, with all the engine bit questions. Why not just source an engine out of an M car someone has rolled or something? Or, I'd be on the lookout for an N54, that's the latest greatest inline 6 with the twin turbo set up. It'll destroy just about anything else on the road. And in an E30...............THAT would be freakin awesome.
That Twin Turbo engine does sound good but the Green bucks is too much bro .... as for the valves il then go with the M50 NV cams , correct me if im wrong ur saying if the piston stands out from the block by 1mm i can compensate for that with a thicker gasket ........
so normally to stroke a M50 NV engine from 2.5 - 2.8 , they use a M52 crank/rods but M50NV pistons ...... so my reasons for putting the head and pistons on is jus to maintain that same standard compression with alittle better lift on the intake valve. so what u say u think its can work ....?
1more question when installing perfomance cams what should one take into concideration ....