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Engine Specific Info and Questions => TDI Engine -General Info => Topic started by: fspGTD on November 11, 2005, 07:20:53 pm

Title: SDI variable runner length intake manifold
Post by: fspGTD on November 11, 2005, 07:20:53 pm

Check out this weird-looking intake manifold:
(http://www.imagestation.com/picture/sraid194/p018ea70d42be5c170f018b7da62240b1/f17f2a1e.jpg)

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?

Title: SDI variable runner length intake manifold
Post by: Master ACiD 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.

Title: SDI variable runner length intake manifold
Post by: lord_verminaard 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

Title: SDI variable runner length intake manifold
Post by: TDIMeister 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...

Title: SDI variable runner length intake manifold
Post by: fspGTD 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  :) )