long tube intake, Chrysler Options

[930cabman]

Looking at this technology from 60+ years ago

https://www.macsmotorcitygarage.com/secrets...-ram-induction/

wondering has anyone gone after another 10% give or take?

[technicalninja]

Pretty much ALL of the OEMs went that way...

That is the REASON Tygaboy's Ferrari has the extra butterflys in the intake.

In the 90s I saw a proliferation of variable length intake tracts.

The MOST COMPLEX ones were on the Mazda Rotary engine.

It had a rotating barrel in it and could vary the intake tract incrementally.

Those were exotic as shit!

Most set ups have a long (low speed) and a short position (high speed).


VLIs are less common now but I still see them occasionally.

I believe what happened is the OEMs figured out designing the intake for a specific range (1500-2500rpm is my guess) worked OK across all ranges but created the very best fuel economy without the complexity of the variable BS.

The Lamborghini V10 that is also used in the Audis has a MONSTER complicated intake plenum because of this crap and that intake in the MOST COMMON failure point in that drive train. There are multiple YouTube vids on that intake and its repair.


Edit:

The modular intake for the type 4 I designed has long correctly tapered tubes with the largest radius I could fit into a 914 (improve torque in low to mid-range) to a central plenum with a single electronic T-body.

The "injector mount" section would be super short and the flange in the DCOE pattern so that a guy building a high RPM motor could fit the butterflys closer to the valves that any other option.

super short DCOE throttle bodies are available.

https://www.jenvey.co.uk/throttle-bodies-an...m-vshort-tssxxi

[jd74914]

Pretty much ALL of the OEMs went that way...

Yep.

But in modern day, you often see more gains (remember-the key is maximizing the area under the efficiency curve) with variable valve timing and valve lift controls. Throttle bodies and long intake runners have high pumping losses associated with them (think drinking through a small straw) and space contraints so the real control point is moving towards the valves. That's why some cars currently only have 2 position throttle bodies (think some BMWs).