Swirl deallies are they needed? Please explain crossfire to me?

[nelson84]

I was looking at a picture of the top part of the intake off and I don't get it? The fuel is injected from above and hits the swirl deals and sprays around in the bottem section of the intake? So the swirl deals help the fuel get distributed amoung the runners? But how?:confused The fuel just makes its way there eventually? Why did they put the injectors where they did? They are not even near the all the runners. Some of the ports must get alot less fuel than the others? With out the swirl deals the fuel would just run straight down, correct and flood the lower intake manifold? I am surprised that this crossfire can even stay running. It really makes the TPI look good.

 

[xrcrx]

They are supposed help prevent "puddling" , particularly in colder weather. i removed mine completely after porting my intake. When I was in Va. and D.C. it got down to 17-18 degrees and I had no issues with cold starts or hot starts. The removal of the swirl plates presented no negative effects. Some folks modify theirs by cutting away some of the material.

 

[nelson84]

Why didn't they put 4 single TB's on the crossfire, one above each dual port runners? Would make more sense wouldn't it?:confused

 

[xrcrx]

I can only guess at this but 4 injectors on a "wet-flow" manifold would require too much to sync and also add cost and complexity. The Crossfire also resembled the old cross ram Z-28 intake. The 82 Z-28 used the same manifold but with smaller injectors.

 

[nelson84]

smaller injectors thats gay.

 

[xrcrx]

305 in the Z-28, less fuel requirement. 165hp. Our car has a terrific shortblock, right down to forged flat top pistons. head choice and cam choice when running the CFI is critical, if you go too far the stock ecm is useless and you have to go to a 7747 ecm or an equivelent, get a HAM board or Ostrich to make it work in our car, then tune tune tune!

 

[nelson84]

Whats a ham board and whats an ostrich?