Fordmods Logo

Intake manifold porting 

 

Page 1 of 1 [ 5 posts ] 

 
 Post subject: Intake manifold porting
Posted: Fri May 30, 2008 10:49 am 
Fordmods Newbie
Offline

Posts: 2

Joined: 30th May 2008

Location: Bathurst
NSW, Australia

I am currently running a nizpro manifold on my N/A vehicle (BA)with the butterflies sill in place inside of the lower half of the manifold. In the near future I am looking at installing more aggressive cams , 4.1 diff gears and a stall converter. I am also thinking of opening the lower half of the manifold up removing the butterflies somewhat similar to what has been done in the picture below a RPD ported manifold.

Before doing this I am just after some advise. Do you think that the runner openings are too large if I was to do this, how would it effect performance? Do you think it would benefit a vehicle that only revs to 6500rpm. Would the intake velocity decrease considerably and effect the performance? Would it be better to simply remove the butterflies and port match the intake with out cutting out the material between the butterflies and other openings?

As I say I will be doing the diff ratio and stall converter so a loss in low down power and torque is not a big concern.

Image
Top
 Profile  
 
 
Posted: Fri May 30, 2008 12:08 pm 
Getting Side Ways
Offline

Age: 37

Posts: 1087

Joined: 1st Sep 2007

Ride: '07 LT XR5

Power: 133 rwkw

Location: sydney
NSW, Australia

i could be very wrong, but removing the butterflies will reduce low down torque considerably wont it?

 

_________________

So much RAM the motherboard twisted off the POST.

I lost 3 cylinders... but gained a turbo...
Proud owner of an '07 XR5Turbo

Top
 Profile  
 
 
Posted: Fri May 30, 2008 12:35 pm 
Getting Side Ways
Offline
User avatar

Age: 70

Posts: 3555

Joined: 7th Nov 2004

Gallery: 4 images

Power: 482 rwkw

Location: Penrith
NSW, Australia

Depends on cam choice and compression??
If you have a cam that won't have torque under 2000 rpm ?? The bbm may not make much difference ? Also restrict power when cam etc starts to work...
There are 1000's of these manifolds around !! Soif you want to go back its not an issue...Around 10 to 1 compression with good cam ? But some timing may need to be re calibrated?? In peak torque range...
I'd say give it a go...

 

_________________

As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

Last edited by EBXR8380 on Fri May 30, 2008 12:37 pm, edited 1 time in total.

Top
 Profile  
 
 
Posted: Fri May 30, 2008 12:35 pm 
Getting Side Ways
Offline
User avatar

Age: 41

Posts: 10829

Joined: 17th Apr 2005

Gallery: 34 images

Ride: BF MK11 XR 6 TURBO ZF 6spd

Power: 225 rwkw

Location: glenwood/sydney
NSW, Australia

SgtBourne wrote:
i could be very wrong, but removing the butterflies will reduce low down torque considerably wont it?
in an NA application...yes... pm "Fast xr" (vince) to hear all about that..... :lol:
Top
 Profile  
 
 
Posted: Fri May 30, 2008 3:36 pm 
Fordmods Newbie
Offline

Posts: 2

Joined: 30th May 2008

Location: Bathurst
NSW, Australia

I have basically lost all low down torque already due to fitting the nizpro manifold. It does not have dual runners. I only have the butterflies fitted at the moment to restrict air volume and the runners are always short. I don known how much more lowdown torque I would really lose by removing the butterflies completely?

SgtBourne wrote:
i could be very wrong, but removing the butterflies will reduce low down torque considerably wont it?
Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 1  [ 5 posts ] 

Who is online

Users browsing this forum: No registered users and 50 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Thu Mar 28, 2024 10:26 pm All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names