certainly no need to apologise for "teaching me to suck eggs" a certain element of stating the obvious is always useful when discussing anything technical or in development, you never know what may kick off a good idea.
same as i wasnt trying to be pedantic about the drive line mass in the flywheels thread.
i have been considering some form of variable length intake for the e30, i think something designed to work at 5500 rpm and a longer runner aimed at 3000 rpm could be a good combination.
iv been thinking log style plenum, with 6 direct straight as possible down draught long runners that curve down by the turret to the log, with some method of short circuiting between the plenum and the port.
obviously this will require some sort of trick, and may stuff up the porting, its all things ill have to make up as i go along, cause right now i just dont know how the intake will behave on the m20 6pot, its uncharted territory.
i think the first thing ill do is build a couple of wave models to determine the best lengths for cylinder filling at 2500-3000 and at 5000-6000, which are your normal road cruze and GLF revs,
those lengths and sizes should give me an idea as to what will be needed for the manifold, and thus if its feasible to build or not.
making the intake stacks longer or constricting the length of the runners is another way of doing it, but may be much more difficult to implement.
one of the troubles of this is i intend to put it on lpg at some point so what ever i make has to be backfire proof in some way shape or form, failing that it has to have the provision for near port gas injection.