4" Crossover tube?

[Begle1]

Has anybody ever seen a 4" cross over pipe?

I thought I had seen one... But looking at it now, things would be tight.

[gear jammer 91"]

I remember seeing pictures of a 3" crossover pipe that someone had built, I think it was over on DTR It hit the sound deadening material on the under side of his hood, but it fit. I think any larger and the hoods not gonna shut.

[Begle1]

I got 4" clamps, so the current idea is to get 4" pipe and clamp it down into a 3" thick ellipse.

Should be doable, right?

[CaptainChrysler]

Where there's a will, there's a way.

From what I have gathered anything bigger than 3" is not practical or even necassary.

I am building a 3" one right now. Will have pics when the compressor cover gets here.

[Begle1]

I can see 3" being more than enough for the crossover tube diameter, but it seems to me that any added area to the plate on the head would help spread air to all of the cylinders.

What we really need is either a twin-ram setup like what Jim Lane's got, or a big fan-type manifold like what comes on a lot of heavy duty/ industrial applications and is open along the entire head.

The manifold fabrication itself would be easy, but some funny injection lines would be necessary as well. I'm sure there's a practical limit to how ling injection lines can be, right?

[CaptainChrysler]

You are talking about building a new top plate altogether?

I was going to, then the whole injector line deal changed my mind.

Factory water to air aftercooler injector lines would probably work.

[Begle1]

Factory water to air aftercooler injector lines would probably work.

I've never seen them.

What do those injector lines look line?

[CaptainChrysler]

like this:

[Begle1]

Ohh yess... That looks like it would be a step in the right direction.

How much do you think those lines would cost?

Judging by the spacing on the injectors, it looks like it'd let you have a nearly two-foot spread instead of the stock two-inch spread.

[CaptainChrysler]

Judging by the spacing on the injectors, it looks like it'd let you have a nearly two-foot spread instead of the stock two-inch spread.

???? I don't follow?

For the custom intake cover?

[Begle1]

Yeah, it'd let you drastically enlarge the mouth of the intake-to-head mounting surface.

It'd probably be as beneficial as having your cylinder head ported.

[CaptainChrysler]

Yeah it pretty much leaves the whole area wide open.

[Ace]

Just because you stack a huge volume of air up behind the manifold doesn't mean it will travel through the combustion chambers any differently than before.

2 cubic feet of air at 10psi looks the same as 200 cubic miles of air at 10psi to the intake valves.

[mprmn08]

actually if you have more area to stuff the boost it will be more volume. Yes it may still be 10 psi here and 10 psi there but with more cubic area to put it in will be more volume of the same pressure. just think of air compressors. If you have a 5 gallon tank with 50 psi in it theres less air in there then a 50 gallon tank with 50 psi in it.

[1991cummins]

yah, i agree with ace, unless you see something that would cause restriction... but stock should be ok i would think, i would think a three inch crossover and the stock "mouth of the head" should flow all the air you will need, especially if you have not ported your head yet...

just an opinion though...