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Author Topic: SDI variable runner length intake manifold  (Read 3946 times)

November 11, 2005, 07:20:53 pm

fspGTD

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SDI variable runner length intake manifold
« on: November 11, 2005, 07:20:53 pm »
Check out this weird-looking intake manifold:


It's some sort of variable runner length intake manifold that was developed for a VW SDI motor.

Which application, or if it ever made it into production, I don't know.  Has anyone heard of this or seen it before?


Jake Russell
'81 VW Rabbit GTD Autocrosser 1.6lTD, SCCA FSP Class
Dieselicious Turbocharger Upgrade/Rebuild Kits

Reply #1November 11, 2005, 09:38:11 pm

Master ACiD

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SDI variable runner length intake manifold
« Reply #1 on: November 11, 2005, 09:38:11 pm »
i have one of those on my mazda. its got 2 very distinct and seperate intake manifolds, although it has only 1 throttle boby. there are 4 butterfly valves, 1 for each runer, that open at 5250 rpm to change tbetween the very long runners (for low end power) and the very short runners (for more top end).

having such a intake on a vw diesel would be a really cool idea.

Reply #2November 12, 2005, 10:01:15 am

lord_verminaard

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SDI variable runner length intake manifold
« Reply #2 on: November 12, 2005, 10:01:15 am »
VR6 engines have been using a variable intake for a long time.  Pretty nifty idea.  That picture you posted, Jake, is from engine code BDJ, which is a 2.0 SDI engine, 77 hp.  Found in 04 Caddys, and 04-05 Golf.  ;)  Euro only, of course.  Part number is: 038 129 711 CB, and the "throttle body" is a separate piece, 038 128 063 C.  

You should see the hoses and tubes that come from the air cleaner!! What a mess!!!

Brendan
84 Scirocco 8v
00 Camaro L36 M49
81 Scirocco 'S -->Soon to be m-TDI
93 Corrado SLC VR6
'86 Golf N/A Diesel  -->Wife's car
1990 Audi CQ
05 New Beetle PD TDI


"I am a man, I can change... if I have to.... I guess....."

-Red Green

Reply #3November 16, 2005, 05:44:55 pm

TDIMeister

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SDI variable runner length intake manifold
« Reply #3 on: November 16, 2005, 05:44:55 pm »
Ooh, nice find!  I wish I would have gotten one to try out. :)

But the SDI manifold worked nicely in my Passat though, although I cannot say if it did any distinguishable difference...

Reply #4November 17, 2005, 02:14:50 am

fspGTD

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SDI variable runner length intake manifold
« Reply #4 on: November 17, 2005, 02:14:50 am »
Brendan, thanks for the info.  It's good to know it actually made it into production.  I wonder if it would hold up to boost pressure?

TDIMeister, I will test my long runner (but not variable) intake I am currently working on for my Rabbit GTD autocrosser versus the stock "no runner" turbo-diesel intake manifold, so we'll know if the plenum and longer runners really help a turbo-diesel or not (and how much  :) )
Jake Russell
'81 VW Rabbit GTD Autocrosser 1.6lTD, SCCA FSP Class
Dieselicious Turbocharger Upgrade/Rebuild Kits