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I was playing around with the Dynomation program I purchased some time ago, designing a theoretical 14.0l 48valve V-12 (based on the Chevy bigblock, with Thunderpower 4valve pushrod heads).
In that program you can make a comparison of up to 4 engines, so i made 2 different intake lengths, and noted down the differences.

The long intake is 3.56 times longer than the short one.

Long intake max torque @4000rpm, short -508nm. (short -286hp)
Long intake max power @6200, short +140hp.

Short intake max torque @5600, long -129nm.
Short intake max power @6800, long -273hp.

The crossover point is @5200rpm, over that the short intake is better.
But both are nearly identical under 2400rpm.


So between 2600rpm and 5000rpm the long intake gives a torque increase of minimum 3,5% up to maximum 37% then down to 6,5%
At 4000rpm the difference is 286hp and 508nm. (In 1995 the BMW M3 3.0l engine had 286hp and 320nm. A BMW 750i (5.4l) from the same year has 490nm. )

I know that the workload would be significant, but I think that, maybe as a later update adding variable intakes, this would give a very real increase in effectivness to the engines.

Can't you post a picture of the dyno test?

It's only a test in theory. The engine only exists inside my head.

It would be fun to try and build it, but it needs a custom casted engine block, custom cylinder heads, custom crank, oil pan, cam shaft, intake manifold, ignition system.

The only parts already on the market are : pistons, valvetrain, connecting rods, cam drive, water pump.

The cost would be very, very high.


stubbekrossen, check your PM box

I think he just meant screenshots of dyno graph from dynomation.

I don't have a way to post images, but can email him a screenshot.

Or someone here on the forum that can post an image.

post them on http://www.imageshack.us and then link it here, simple

http://img248.imageshack.us/img248/440/ ... medium.jpg




Hope this works.
edit: Heh , it worked.^^

Not just Variable length intakes, but multi-runner intakes, too.
Like the Aussie Ford Falcon, Hyundai Terracan V6, few mitsubishi V6's, that have two sets of intake paths, a long and short, with throttle butterflies and an actuator.
Like variable cam timing, but for your inlet manifold.

Yeah, they're pretty sweet, they'll turn up eventually

Variable length intake from an BMW I think

That's a really elegant way of doing it, I like it!