Performer RPM Air-Gap plenum notch - 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 04-08-2013, 08:30 AM
v8hed's Avatar
AK427
 
Last photo:
Join Date: May 2008
Location: Northampton, UK
Age: 39
Posts: 794
Wiki Edits: 0

Thanks: 1
Thanked 3 Times in 3 Posts
Performer RPM Air-Gap plenum notch

If anybody out there has a Performer RPM Air-Gap laying around, can you measure the length and depth of the plenum divider notch? Would really appreciate it.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 04-08-2013, 11:46 AM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,284
Wiki Edits: 0

Thanks: 5
Thanked 399 Times in 393 Posts
If you have a non air gap RPM manifold do not carve the plenum divider.
Just try a open spacer. The effect is the same, and easily reversable.

Carving the plenum divider is not.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 04-08-2013, 12:49 PM
v8hed's Avatar
AK427
 
Last photo:
Join Date: May 2008
Location: Northampton, UK
Age: 39
Posts: 794
Wiki Edits: 0

Thanks: 1
Thanked 3 Times in 3 Posts
Quote:
Originally Posted by F-BIRD'88 View Post
If you have a non air gap RPM manifold do not carve the plenum divider.
Just try a open spacer. The effect is the same, and easily reversable.

Carving the plenum divider is not.
No room for a carb spacer.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 04-08-2013, 02:17 PM
v8hed's Avatar
AK427
 
Last photo:
Join Date: May 2008
Location: Northampton, UK
Age: 39
Posts: 794
Wiki Edits: 0

Thanks: 1
Thanked 3 Times in 3 Posts
Quote:
Originally Posted by F-BIRD'88 View Post
If you have a non air gap RPM manifold do not carve the plenum divider.
Just try a open spacer. The effect is the same, and easily reversable.

Carving the plenum divider is not.
No room for a carb spacer.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 04-08-2013, 02:20 PM
Registered User
 
Last photo:
Join Date: Nov 2006
Location: Woodstock
Posts: 987
Wiki Edits: 0

Thanks: 2
Thanked 87 Times in 80 Posts
6:15 of this vid.

Not sure what the measurement is.

peace
Hog
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 04-08-2013, 02:23 PM
v8hed's Avatar
AK427
 
Last photo:
Join Date: May 2008
Location: Northampton, UK
Age: 39
Posts: 794
Wiki Edits: 0

Thanks: 1
Thanked 3 Times in 3 Posts
Quote:
Originally Posted by Hogg View Post
6:15 of this vid.
Edelbrock Intake Manifold Dyno Test :: Single Vs Dual + Air-Gap Vs Regular - YouTube

Not sure what the measurement is.

peace
Hog
Yea, seen that... exactly why I want to do the mod
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 04-08-2013, 03:08 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,284
Wiki Edits: 0

Thanks: 5
Thanked 399 Times in 393 Posts
If you had the correct low profile drop base air cleaner (or at least the right base) you would have room.
There is a BIG difference. It does more than just make for more hood clearance too.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 04-08-2013, 03:16 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,284
Wiki Edits: 0

Thanks: 5
Thanked 399 Times in 393 Posts
Reducing the plenum divider has a much more profound effect on the low speed and midrange drivability that you will feel, than
any gain at the top end , that you probabily will never actually realize a actual performance gain.

Test with a carb spacer FIRST. Best at the drag strip, where you can get real +/- performance data.

The right air cleaner will make more difference.

The best carb spacers are made of WOOD. Edelbrock makes many wood ones in different styles.
You can fabricate your own, too.

Last edited by F-BIRD'88; 04-08-2013 at 03:37 PM.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 04-08-2013, 04:11 PM
malc's Avatar
Living At The Speed Of Life
 
Last photo:
Join Date: Jun 2003
Location: Espaņa Right Coast
Posts: 3,321
Wiki Edits: 0

Thanks: 117
Thanked 155 Times in 127 Posts
I first had a 1" open spacer on my AirGap but as I had room I went to a 2" open.
Brilliant...

Previously I had tried a 1" four holer, the idle was terrible.

Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 04-09-2013, 09:28 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
I have one for a BBC. The notch is 2.44 X .4 deep.

Kevin
Reply With Quote Quick reply to this message
The Following User Says Thank You to KA67_72 For This Useful Post:
v8hed (04-10-2013)
  #12 (permalink)  
Old 04-09-2013, 09:46 PM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 29
Posts: 9,476
Wiki Edits: 0

Thanks: 20
Thanked 385 Times in 361 Posts
The notch size is nothing special, every combo will want something different, especially depending on what carb is on top. Btw some people fill in that notch and get better results... As already noted its not easily filled and may NOT be a good move. I'd try a half inch spacer if space is tight.
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
Performer RPM Air Gap plenum divider info v8hed Engine 9 07-31-2011 05:59 PM
Edelbrock Performer vs Performer RPM vs Air Gap RPM Regal Beagle Engine 10 02-16-2009 08:07 PM
Performer RPM to RPM Air Gap Swap-350 chev corvette77 Engine 3 09-01-2008 09:23 PM
performer rpm air gap bracketeer Engine 24 05-29-2005 05:36 PM
air gap vs rpm performer ko.17 Engine 5 03-20-2005 09:59 PM


All times are GMT -6. The time now is 02:43 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.