gsx itb sbc intake fab? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 01-02-2012, 07:41 PM
Registered User
 

Last journal entry: Starting the build, 333ci chev, 195 cc jegs heads
Last photo:
Join Date: Mar 2009
Location: anoka mn
Posts: 379
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
gsx itb sbc intake fab?

Anyone build an intake with gsx itbs? I am thinking about fabing a manifold with itbs for my road race engine seeing everyone and their brother says to go fuel injection. If i am am going to go efi then i am going to do it right. and efi setup with proper velocity stacks and itbs is the way to go in my opinion.

each runner tapers down to the back throttle bodies which are 42mm
Attached Thumbnails
Click image for larger version

Name:	Back picture 2 with the all the throttle shafts open.jpg
Views:	162
Size:	74.7 KB
ID:	61366   Click image for larger version

Name:	Back picture.jpg
Views:	117
Size:	72.2 KB
ID:	61367   Click image for larger version

Name:	Front throttle shaft open.jpg
Views:	182
Size:	73.3 KB
ID:	61368   Click image for larger version

Name:	the hole in each runner.jpg
Views:	95
Size:	49.9 KB
ID:	61369   Click image for larger version

Name:	The odd fuel injector setup and the TPS sensor.jpg
Views:	186
Size:	74.5 KB
ID:	61370  


    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-02-2012, 07:46 PM
Registered User
 

Last journal entry: Starting the build, 333ci chev, 195 cc jegs heads
Last photo:
Join Date: Mar 2009
Location: anoka mn
Posts: 379
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
for the point of each picture run your mouse over each attachment and the name of the file is what each of the picture is.

The throttle shaft also looks like it would be a really nice place to put a dry nitrous spray bar through. They have a bolt at the top and bottom that hold them together. Once removed you end up with two sets of two throttle bodies.
Attached Thumbnails
Click image for larger version

Name:	This is with the front set of throttle valves closed.jpg
Views:	133
Size:	74.3 KB
ID:	61371  
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-03-2012, 01:43 PM
Project89's Avatar
Registered User
 
Last photo:
Join Date: Oct 2011
Location: utah
Posts: 1,006
Wiki Edits: 0

Thanks: 12
Thanked 37 Times in 34 Posts
depending on the spacing of the tb's and this intake u might be able to adapt those tbs to this intake manifold

http://www.ebay.com/itm/SBC-CHEVY-CR...item45ff5ae138

Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-03-2012, 09:10 PM
Registered User
 

Last journal entry: Starting the build, 333ci chev, 195 cc jegs heads
Last photo:
Join Date: Mar 2009
Location: anoka mn
Posts: 379
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
That is actually the manifold i was thinking of.

Would this be worth it compared to a good single plane carb?
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-03-2012, 09:27 PM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 29
Posts: 9,484
Wiki Edits: 0

Thanks: 20
Thanked 388 Times in 364 Posts
The gsx tb's are WAY too small. They work well on small displacement 4 bangers but become a choke on anything with more than .5l per cylinder. So what is it worth- a 50hp loss at peak. With correctly sized lengths though they can pick up low end torque.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 01-03-2012, 09:40 PM
KA67_72's Avatar
Member
 
Last photo:
Join Date: Jan 2003
Location: Knoxville, Tn
Posts: 313
Wiki Edits: 0

Thanks: 1
Thanked 4 Times in 4 Posts
Blight,
I've always loved IR setups. You probably will have to experiment with how you read(average) manifold pressure. I'm developing a 4 barrel throttle body and was very surprised about how little air it takes to idle a motor. Throttle response is going to be lightning quick at the price of tip in being hard to control. If you have a manual you may find yourself riding the clutch a lot trying to keep it from bucking. This looks like a cool project. Keep us posted.

That's a great price on that intake, but there are some things Procomp should leave sacred. Is there nothing they won't make cheap Chinese knockoffs of?

Kevin
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 01-03-2012, 10:13 PM
4 Jaw Chuck's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Mar 2002
Location: Manitoba, Canada
Age: 47
Posts: 5,112
Wiki Edits: 0

Thanks: 2
Thanked 119 Times in 94 Posts
Quote:
Originally Posted by ap72
The gsx tb's are WAY too small. They work well on small displacement 4 bangers but become a choke on anything with more than .5l per cylinder. So what is it worth- a 50hp loss at peak. With correctly sized lengths though they can pick up low end torque.
Ap72 is right, I looked into this back in the 80's and there is a huge lack of flow capacity with motorcycle setups.

Would look cool though.
__________________
Outlawed tunes from outlawed pipes
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 01-03-2012, 10:15 PM
Registered User
 

Last journal entry: Starting the build, 333ci chev, 195 cc jegs heads
Last photo:
Join Date: Mar 2009
Location: anoka mn
Posts: 379
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I was looking for 48 mm from a boosa today no luck yet 42 is too small. 48 would about perfect.

tip in?

I am running an automatic with a 2400 stall
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 01-04-2012, 12:12 PM
KA67_72's Avatar
Member
 
Last photo:
Join Date: Jan 2003
Location: Knoxville, Tn
Posts: 313
Wiki Edits: 0

Thanks: 1
Thanked 4 Times in 4 Posts
Tip in is when you start to open the throttle off idle. It looks like the Hilborn SBC stuff starts around 2-3/16. I have an old one here that is 2-1/16.

Kevin
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 01-04-2012, 02:29 PM
Project89's Avatar
Registered User
 
Last photo:
Join Date: Oct 2011
Location: utah
Posts: 1,006
Wiki Edits: 0

Thanks: 12
Thanked 37 Times in 34 Posts
Quote:
Originally Posted by ap72
The gsx tb's are WAY too small. They work well on small displacement 4 bangers but become a choke on anything with more than .5l per cylinder. So what is it worth- a 50hp loss at peak. With correctly sized lengths though they can pick up low end torque.
not meaning to argue with u but how is that possible, the tpi engines of the 80's used a single tb with twin 50mm blades,and most stock tbs have a single 70-75mm tb.

u would think that eight 42mm blades would flow a helluva lot more, whats the throttle blades on a typical 750 or 850 carb measure???
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 01-04-2012, 04:17 PM
Registered User
 

Last journal entry: Starting the build, 333ci chev, 195 cc jegs heads
Last photo:
Join Date: Mar 2009
Location: anoka mn
Posts: 379
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by KA67_72
Tip in is when you start to open the throttle off idle. It looks like the Hilborn SBC stuff starts around 2-3/16. I have an old one here that is 2-1/16.

Kevin
how is tip in "hard to control" then?
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 01-04-2012, 04:19 PM
Registered User
 

Last journal entry: Starting the build, 333ci chev, 195 cc jegs heads
Last photo:
Join Date: Mar 2009
Location: anoka mn
Posts: 379
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Project89
not meaning to argue with u but how is that possible, the tpi engines of the 80's used a single tb with twin 50mm blades,and most stock tbs have a single 70-75mm tb.

u would think that eight 42mm blades would flow a helluva lot more, whats the throttle blades on a typical 750 or 850 carb measure???
the throttle body has to flow what cfm the head is at,at max lift. i can't remember the exact flow rate of each throttle body size but it also has to do with the shape of them also.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 01-04-2012, 04:28 PM
KA67_72's Avatar
Member
 
Last photo:
Join Date: Jan 2003
Location: Knoxville, Tn
Posts: 313
Wiki Edits: 0

Thanks: 1
Thanked 4 Times in 4 Posts
With your converter you may not have issues with tip in. Even if you have problems with it at first, there are things you can do to sort it out like progressive linkages.

Kevin
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 01-04-2012, 04:40 PM
Project89's Avatar
Registered User
 
Last photo:
Join Date: Oct 2011
Location: utah
Posts: 1,006
Wiki Edits: 0

Thanks: 12
Thanked 37 Times in 34 Posts
Quote:
Originally Posted by blight
the throttle body has to flow what cfm the head is at,at max lift. i can't remember the exact flow rate of each throttle body size but it also has to do with the shape of them also.
how about a common plenum per 2 cyls, sinc eno 2 cyls on the same side will be pulling air at the same time if u built a common plenum feeding 2 runners using 2 tbs to feed each plenum, should solve the issue of them being to small.

though this woudlnt be a true itb setup, i would assume it would still act the same as if it were
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 01-05-2012, 06:27 AM
Registered User
 

Last journal entry: Starting the build, 333ci chev, 195 cc jegs heads
Last photo:
Join Date: Mar 2009
Location: anoka mn
Posts: 379
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I do not know enough to answer that question maybe someone else does. I just know what I am doing from what I have read/been told. That far in the tech on this subject I am in lack of information.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
OE Vortec intake gaskets with aftermarket heads/intake? 04SilveradoMykk Engine 3 05-18-2009 12:07 AM
Matching intake ports heads/intake dpjmw Engine 6 08-13-2007 08:29 PM
intake help?OFFenhauser low pro. ram intake manifold 74chevyflat Engine 0 05-17-2006 08:49 PM
weiand stealth intake vs Edelbrock rpm intake batman09 Engine 18 10-10-2004 02:41 AM
Intake manifold gaskets for alum. heads and intake mustang66maniac Engine 6 02-20-2004 12:19 PM


All times are GMT -6. The time now is 01:29 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.