Howdy,

I was looking at the wreckers a little while ago, and I saw that the 2nd gen magna v6 appeared to have a variable length inlet manifold, a-la ef+ falcon.

Just wondering a few things:

(1) Has anyone played with the switching points on the manifold on their 2nd gen v6?

(2) why do you think Mitsi discarded them for the 3rd gens, just not worth the gains for the $, or what?

(3) Anyone thought of making a variable length manifold setup for 3rd gens? I'm assuming there's bonnet clearance...

(4) Did the US dohc v6s get a variable length manifold?

Cheers,

Dave

I can answer (4): Yes it did

I was looking at the wreckers a little while ago, and I saw that the 2nd gen magna v6 appeared to have a variable length inlet manifold, a-la ef+ falcon.
Sure do.


(1) Has anyone played with the switching points on the manifold on their 2nd gen v6?
Nope. For this I'm sure that Mitsu would have it right for maximal torque for low rpm. Some people try fiddling with their Mivec change over point but it's not worth the hassel, it's spot on unless you've done some cam changes.


(2) why do you think Mitsi discarded them for the 3rd gens, just not worth the gains for the $, or what?
No idea. Probably wanted to keep their tooling cheap. Seems everything they do is based on an economic motive.


(3) Anyone thought of making a variable length manifold setup for 3rd gens? I'm assuming there's bonnet clearance...
Not that we've heard but I know where I'd start.


(4) Did the US dohc v6s get a variable length manifold?
I'd imagine so.

Killbilly, do you have a pic of the dohc variable intake manifold?

Redav:
(1) I figured some 2nd gen lads had gotten into cam changes in conjunction with rpw. It might be worth looking into the changeover then, but if noone's done it, no info to get from it :|

(3) Where would you start? I'd probably try to find other manufacturers' manifolds that are similar volume runners etc, and see what I'd come up with. IIRC the 2nd gen manifold has smaller diameter runners than the 3rd gen.

Cheers,

Dave

Redav:
(1) I figured some 2nd gen lads had gotten into cam changes in conjunction with rpw. It might be worth looking into the changeover then, but if noone's done it, no info to get from it :|
Yeah, true. It would be easy to asertain too. Just run two runs per setup for the length and set it at the rpm where the two graphs cross. It could also identify whether there's much of a difference anyway.


(3) Where would you start? I'd probably try to find other manufacturers' manifolds that are similar volume runners etc, and see what I'd come up with. IIRC the 2nd gen manifold has smaller diameter runners than the 3rd gen.
Easy, find a Mivec engine and check to see if the plenum would fit to the manifold from a SOHC. No guarentee that it would work. If it all bolted up, all you'd need to do is get something to activate it at a specific rpm.

Killbilly, do you have a pic of the dohc variable intake manifold?

Looks exactly the same as the SOHC 12v 6G72 one.

Alright, will do some investigating...might even measure up runner volume etc of the 12V 6g72 mani etc as well.


If it all bolted up, all you'd need to do is get something to activate it at a specific rpm.
Too easy, knew I did electronic engineering for something :D (So long as the computer is tuned after the switch is set up, it doesn't really need to know that there is any switching going on...though it might be a function that is available on some computers too.)

Also, not having seen a 3rd gen head without the lower manifold bolted on, does the head have 2 ports on the inlet side (1 for each valve), or just the one (merged internally to the head?)

Cheers,

Dave