Common plenum or individual runners???, for gas milage and drivability Options

[Mueller]

for my 2316 it seems that the stock plenum might be reaching it's limits as far as volume goes.....so, I either fabricate a larger common plenum, or go with individual throttle bodies such as TWM or Jenvey*

single plenum would be easiest, but the individual throttle bodies look better (IMG:style_emoticons/default/smile.gif)

has anyone switched from one to the other on the same motor with everything else being the same???



*Jake Raby is the U.S. distributor of these....

[DNHunt]

I can't offer much except that about the only thing working well on the new engine right now is the MAP sensor. The old 2.0l with the same sensor and same single throttle body had about 45 kPa of vacuum at 1000 rpm. The 2270 is around 65 kPa. Jake was kidding about a vacuum signature. This thing wants air. I suspect I'll need more throttle body and maybe more plenum.

Anybody thought of a riser on the stock plenum with about a 65 mm throttle body. Easy to make, cheap. You could probably add a couple hundred cc's without too much problem. On the down side you get a shaped column of air aimed at the flat bottom of the plenum you get another gasket and you have to open the top of the plenum up. Also, you loose that nice big air box before the butterfly.

Dave