Hi Perry,

Thanks for the reply!

I'm a bit of a gas flow novice tbh but could you tell me why an inlet that outflows a head would be a bad thing?

The runners would be specific to this inlet, ie) have the correct cross sectional area to match the ports so a mismatch wouldn't be present, im aware of the damage mismatched ports etc can do to flow.

Are there any good books/papers specifically about inlet manifold design etc that you could recommend? I have heard so many conflicting opinions about manifold design!

You mention design for a specific power band etc? What design considerations are we talking about? restricting max flow to closer match a head, tailoring plenum volume for a specific application or choosing runner length carefully...? Im assuming that runner length plays a smaller part on a boosted engine than for N/A, IE) long runners wouldn't have such a great effect on low/midrange torque compared to longer runners on the n/a engine.

Would a manifold that could flow a lot (more air than my application needs) be detrimental to power due to a drop in gas velocity? So designing a manifold that could flow a similar amount as my head would presumably mean the highest possible gas velocity as runners etc would be as small as possible whilst not 'strangling' the head?

I've always been under the assumption that reducing flow restriction whilst maintaining an even flow to all cylinders would increase VE, I hadn't considered that one could go too far.... thinking about it though it makes sense, just the same with heads, a massive port means massive flow... but damages gas speed etc.

Cheers

Rob,