K group.
Got a serious Q for you.
For those of you that have seen the OEM crossfire intake.
What would you do mod wise to make it perform on a more "hardcore" street motor?
What i´m saying is more or less anything goes,but we´re limited to the stock casting(weld away if you want) and the stock looks and setup.

 

Wow, that will be challenging!

Try this link. From your description of the rules, you probably can't use the X-Ram, but you might try grafting a cross-fire top onto a modern manifold base. Hope you are good with the Tig!

http://www.x-ram.com/Crossfire%20Design.htm

Lowend had the same idea.

Can you use 2-bbl TBI's in place of the 1-bbl? If you can, try this link:
http://www.holley.com/HiOctn/ProdLin...SFI/502-3.html

otherwise, the 1-bbl Holley is only rated at 300 CFM:
http://www.holley.com/HiOctn/ProdLin...SFI/500-1.html

Here's another approach:
http://www.newcovenant.com/firebird/...ry/default.htm


Given enough money & time, you can probably come close to a TPI or maybe good dual plane manifold performance.

Good luck!

 

First off - I hate the CFI setup
Second - I've been waiting for a reason to post this link for a long time
http://www.x-ram.com/

 

Lowend, thanks. I forgot to put that link in my post.

 

Thanx guys,but i think you´re pising the point a little.
Maybe i was unclear?

Anyways.
There´s a group of us discussing the possibilitys of the OEM intake to feed some at least more serious numbers than can be had with minor work.

My ideas was to cut away the runner roofs of the intake completely and reweld them "further up" so to say.
Combine that with TB;s bored out to 2,25" and some plywood lid spacers and you get the idea.
Others within the group have other offerings of course.
That in short rules the X-ram out.

 

Quoting from one of the posted links:

"But because of the way the manifold was cast, there is
over 40% reduction in the exit port size. A water transfer
jacket was designed under the manifold to heat the fuel/air
charge and lower emissions. There was nothing outside of
many hundreds of hours of welding in the bottom and grinding
out the inside, that could be done to enlarge the ports."

If you read that and want to give it a go, "hundreds of hours" sounds like a BIG challenge to me.

After looking at the pics and the description, the bottom of the port doesn't match the head. Raising the top might not help much.

What sort of flow numbers were you looking to achieve?


Have you bored out many TBI's?

 

I recall reading about a pressure balance problem with the CrossRam manifold...
If I recall correctly (god help up all) major power can be had by running balance tubes from the front to the rear of the intake manifold runners. It looks like coolant tubes, but it just lets pressure bleed from front runners to the rear.

 

I doubt that strongly. The cross ram is alot like a Smokey Ram, except that the Smokey Ram is a much better intake. Change over to the X Ram setup, or just scrap the whole thing, buy a Super Vic and you will be much farther ahead of the game.

I have done Manifold work, in fact put many weeks into some. There is no point doing that much to a ****ing cross fire, that's going to go nowhere in a hurry. The intake taht took the most time was a Super Vic which needed the port floors raised, and the runners made smaller, that is much harder to do than hogging one out. Don't bother. It's a SBC there are so many manifolds out there to start from, why do that?

Bret