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-   -   Performer RPM Air-Gap plenum notch (http://www.hotrodders.com/forum/performer-rpm-air-gap-plenum-notch-231627.html)

v8hed 04-08-2013 07:30 AM

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.

F-BIRD'88 04-08-2013 10:46 AM

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.

v8hed 04-08-2013 11:49 AM

Quote:

Originally Posted by F-BIRD'88 (Post 1664211)
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.

v8hed 04-08-2013 01:17 PM

Quote:

Originally Posted by F-BIRD'88 (Post 1664211)
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.

Hogg 04-08-2013 01:20 PM

6:15 of this vid.

Not sure what the measurement is.

peace
Hog

v8hed 04-08-2013 01:23 PM

Quote:

Originally Posted by Hogg (Post 1664261)
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 :)

F-BIRD'88 04-08-2013 02:08 PM

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.
http://www.hotrodders.com/forum/atta...chmentid=26555

F-BIRD'88 04-08-2013 02:16 PM

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.

gearheadslife 04-08-2013 02:50 PM

D/f did this,, look up carjunkietv.com on you tube..
it shows the whole thing from carving the intake to the dyno room..
Weiand Vs Edelbrach intake manifold dyno comparison - YouTube "> Weiand Vs Edelbrach intake manifold dyno comparison - YouTube " type="application/x-shockwave-flash" width="425" height="350">
Edelbrock Intake Manifold Dyno Test :: Single Vs Dual + Air-Gap Vs Regular - YouTube "> Edelbrock Intake Manifold Dyno Test :: Single Vs Dual + Air-Gap Vs Regular - YouTube " type="application/x-shockwave-flash" width="425" height="350">

malc 04-08-2013 03:11 PM

I first had a 1" open spacer on my AirGap but as I had room I went to a 2" open.
Brilliant...:thumbup:

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

http://www.hotrodders.com/gallery/da...nch_Spacer.jpg

KA67_72 04-09-2013 08:28 PM

I have one for a BBC. The notch is 2.44 X .4 deep.

Kevin

ap72 04-09-2013 08:46 PM

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.


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