Thread: Intake manifold options

That's what I was going to say, boosted intake manifold would have to be much stronger than an n/a manifold... But if you're boosted, you are probably getting plenty of power out of the manifolds available on the market today..

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Quick question, busy fabricating something at the moment. what size ID runners should you shoot for on a built N/A ve? I'm noticing most people are going with fairly big runners. I've got some 44.8mm ID runners mated to a VE flange and it seems a decent match to the port size at the flange side. The tubing is 3mm wall thickness so I could still port it out another 2mm ID or so if need be. The runners will taper out past 2" over the length towards to plenum.

Any thoughts?

nvd

My high comp 20VE uses a centre fed manifold with 45mm ID runners and 54mm velocity stacks. Total runner length is 11.5" from the flange to the end of the stack. Made 209whp with a piggyback ecu and rough tune. Just got onto Nismotronic and the car is responding well to some initial street tuning, but will need book some dyno time.

A 44.8mm runner does match the port size like you said, and i think if you can taper your runner up to 52-60mm you will see good results, while still maintaining good port speeds.

For turbo applications, there really doesnt have to be any testing, research, or anything special involved in making an intake manifold, in the turbo world, its all about flow....bigger runners and head ported to match and large volume plenum with smooth transition from plenum to runners for a smooth flow, 3 Liter or larger depending on revs and size of turbo. Simple as that. No R&D required. The N/A world, its completely different and yes a lot of R&D is required because pretty much every setup would require a different designed manifold to make the best power.

Turbo guys have it easy for manifolds.

Cool. Got any pics of your setup?



Nice. This is what I like to hear.