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?

[Root_Werks]

I had a Fiero with Caddy V8 many years back. There was an intake from the Alante with long runners that claimed to add hp/tq.

Never did do the conversion so I don't have any real world experience. But if GM was doing it in the 90's, probably some validity to it.

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[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).

[technicalninja]

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).

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I don't give a rat's ass about VLIs...

I LOVE VVT, COP, WB02, GDI and all the real modern shit!

The "valve-tronic" BMW horseshit semi works...

Both the lift and the duration on the intake go down to NOTHING at idle. The valves BARELY move.
"Tip in" is DIFFERENT in those. You press the throttle and there is a significant pause before the valves start to open. You have to "lead" the throttle.

I've never tried but I bet it's a BITCH to cut a "tight light" at a drag strip with those.

One AWESOME thing with the BMW that COOL to watch but pretty much useless is the engine will run and idle fine WITHOUT any part of the intake installed.
Bare head and it just works!

Killer thing to win money on!
I've won $200 betting folks "it will run fine without the intake and not bang off the rev limiter."

[ClayPerrine]

Porsche did it with the 993 Varioram. The intake has plumbing to change from long runners to short runners,controlled by the DME.

Won't fit under the 914 decklid though.

[Root_Werks]

Porsche did it with the 993 Varioram. The intake has plumbing to change from long runners to short runners,controlled by the DME.

Won't fit under the 914 decklid though.

Was that also employed on 986/996 engines?

[ClayPerrine]

Porsche did it with the 993 Varioram. The intake has plumbing to change from long runners to short runners,controlled by the DME.

Won't fit under the 914 decklid though.

Was that also employed on 986/996 engines?

I think so. I never really worked on the water cooled flat sixes.