hand porting crossfire manifold
Thread Starter
Instructor
Joined: Nov 2001
Posts: 210
Likes: 0
From: Watertown CT
hand porting crossfire manifold
anyone know how much more flow can be gained from porting a factory CF casting? how close can it come to an x-ram? also i see in all the porting tech articles that everyone cuts out the egr tube... could i leave that in? i live in CT and they love to stick it in our @#$ with emissions testing.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
Re: hand porting crossfire manifold (da747)
ugh... as far as I know, the only way to effectively port the Xfire intake is to extrude hone it... reaching is hard...
from what I have read, you can nearly double the stock flow rates... nearly... but you need to be careful, the castings can get thin...
from what I have read, you can nearly double the stock flow rates... nearly... but you need to be careful, the castings can get thin...
Le Mans Master
Joined: Sep 2000
Posts: 6,303
Likes: 714
From: Bartlett IL
Re: hand porting crossfire manifold (da747)
da747,
This is my manifold and it has been Extrude Honed
This is what my diffuser plates look like:
If you go to the Xfire Forum, you'll find that Ken did some flow bench work on ported manifolds. It appears that porting a Xfire will increase cfm to about 200cfm per runner. EH claims a 15-30% increase in flow. Unfortunately I haven't had the opportunity to flowbench my manifold. Maybe one day I will.
Its not cheap to have a Xfire EH'd. As for the wire mesh below the diffuser, not sure why you'd go through the bother of reducing restriction and then using wire mesh.
This is my manifold and it has been Extrude Honed
This is what my diffuser plates look like:
If you go to the Xfire Forum, you'll find that Ken did some flow bench work on ported manifolds. It appears that porting a Xfire will increase cfm to about 200cfm per runner. EH claims a 15-30% increase in flow. Unfortunately I haven't had the opportunity to flowbench my manifold. Maybe one day I will.
Its not cheap to have a Xfire EH'd. As for the wire mesh below the diffuser, not sure why you'd go through the bother of reducing restriction and then using wire mesh.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: hand porting crossfire manifold (da747)
CFI-EFI did u extrude home yours, and did you leave the swirl plates in? what do u think about removing them altogether?
RACE ON!!!
Le Mans Master
Joined: Sep 2000
Posts: 6,303
Likes: 714
From: Bartlett IL
Re: hand porting crossfire manifold (da747)
I'd agree with CFI that a ported Xfire will easily run with the
Xram manifold lid and the Weind manifold base. The cost is a little time and elbow grease. Well worth it IMO. In fact, until I swapped cams, I would easily pass Illinois Emissions Testing including the drive cycle.
[Modified by Dominic Sorresso, 10:30 AM 4/16/2004]
Xram manifold lid and the Weind manifold base. The cost is a little time and elbow grease. Well worth it IMO. In fact, until I swapped cams, I would easily pass Illinois Emissions Testing including the drive cycle.
[Modified by Dominic Sorresso, 10:30 AM 4/16/2004]
5th Gear
Joined: Apr 2004
Posts: 5
Likes: 0
From: Muncie IN
Re: hand porting crossfire manifold (da747)
I'm right there with you da747. I want to port my stock Xfire intake as well, so if you find out anything else about it, post it and hopefully we can both gain significant power gains from this.
Thanks
Adam
Thanks
Adam
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Thread Starter
Instructor
Joined: Nov 2001
Posts: 210
Likes: 0
From: Watertown CT
Re: hand porting crossfire manifold (corvetteII)
Adam check out http://crossfire.homeip.net they have a pretty nice xfire porting article.
Drifting
Joined: Aug 2000
Posts: 1,251
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Re: hand porting crossfire manifold (da747)
I think the throttle bodies will not flow as much as a stock ported manifold will already allow.
In another words unless you get much bigger throttle bodies your wasting your time.
As far as performance gain you may see some top rpm power, you will loose low end torque.
The crossfire is all about low end torque.Its a point & squirt type driveing car.
In another words unless you get much bigger throttle bodies your wasting your time.
As far as performance gain you may see some top rpm power, you will loose low end torque.
The crossfire is all about low end torque.Its a point & squirt type driveing car.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Re: hand porting crossfire manifold (nobodyunknown)
I think the throttle bodies will not flow as much as a stock ported manifold will already allow.
In another words unless you get much bigger throttle bodies your wasting your time.
As far as performance gain you may see some top rpm power, you will loose low end torque.
The crossfire is all about low end torque.Its a point & squirt type driveing car.
In another words unless you get much bigger throttle bodies your wasting your time.
As far as performance gain you may see some top rpm power, you will loose low end torque.
The crossfire is all about low end torque.Its a point & squirt type driveing car.
At the risk of repeating myself, *I* gained over a half second in the 1/4 mile from my ported manifold, with the stock TBs. Two weeks later, I installed TBs bore out to 2". I received no additional gain from the larger TBs. Since I had no loss either, I left them in place. Possibly with a little better exhaust, they are now contributing to the cause.
Idle speculation is one thing. The proof is...
RACE ON!!!
