Making a Edelbrock RPM into a Edelbrock RPM Air Gap - Hot Rod Forum : Hotrodders Bulletin Board
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Old 05-10-2003, 10:07 PM
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Post Making a Edelbrock RPM into a Edelbrock RPM Air Gap

Has anyone turned a Edelbrock RPM Intake into a Edelbrock RPM Air Gap?? They seem to be the exact intake except for the notched section. Is this correct?? I was going to go to Summit in Reno and take some pictures and measurment and have my machined out at my work.....Any thoughts on this...???

[ May 10, 2003: Message edited by: black66 ]</p>

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Old 05-10-2003, 11:42 PM
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I would look for one with air gap on ebay for like 50-75 bucks. Then sell the yours for about the same.
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Old 05-11-2003, 12:28 AM
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the standard RPM intake is 1 piece of soild aluminum, the air gap is seperated, I don`t see how it could be done honestly, and I wouldn`t be willing to spend 40 hours with a hand grinder trying to find out either, one wrong move and ruined intake.

[ May 11, 2003: Message edited by: DoubleVision ]</p>
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Old 05-11-2003, 05:51 AM
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As doublevision stated, the Air-Gap is a completely different manifold. The Air-Gap utilizes air passages under the intake runners to cool the intake charge.


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Old 05-11-2003, 08:03 AM
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The only thing I have heard of that might do the same thing, is a valley splash pan. It goes in the valley under the intake manifold and prevents the hot oil from hitting the bottom of the intake. Am not so sure it is as efficient as an air gap, but its similar I believe.
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Old 05-11-2003, 04:50 PM
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Good enough..........that is why I asked for some oppinions.....Thanks guys......
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Old 10-27-2007, 04:31 PM
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I've owned both Perf RPM and Air Gap, and looking at them, I don't think its possible. I think you'd ruin your RPM intake.
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Old 10-27-2007, 06:44 PM
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seeing as this thread is 4 1/2 years old and we never heard how he made out I'm guessing he's still grinding
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Old 11-28-2010, 12:26 PM
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Yes It Can...

The question does not appear to be about cutting the entire manifold it's about cutting out the divider beneath the carb; he said, "notched section." So yes that mod can be done with a thin cutter wheel die grinder.
1) Copy the Air Gap specs. 2) Cut a series of vertical 1/2" deep slots about a 1/4" apart across the divider. 3) Take a pair of pliers and break the pieces off. 4) Use the cutter wheel to smooth the gap and if available glass bead.

Last edited by Novas; 11-28-2010 at 12:34 PM. Reason: more info
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Old 11-29-2010, 06:38 AM
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Quote:
Originally Posted by black66
Has anyone turned a Edelbrock RPM Intake into a Edelbrock RPM Air Gap?? They seem to be the exact intake except for the notched section. Is this correct??
Besides the notched plenum divider, the plenum itself is isolated from the lifter valley- and the hot oil contained there- by having the casting seal the valley, w/o the casting also contacting the plenum. Personally, I prefer the RPM w/o the air gap. The air gap needs longer to warm up and needs some choke or feathering of the throttle until the engine is up to temp.

After both intakes are up to normal operating temp, the performance difference is more from the plenum divider notch than anything, IMO. Fortunately, the plenum notch can be easily duplicated on the RPM intake's plenum divider.

More on the results of the plenum divider modification HERE. This also has a comparison between the Vic Jr. and the RPM, etc..
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Old 11-29-2010, 11:12 AM
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Originally Posted by engineczar
seeing as this thread is 4 1/2 years old and we never heard how he made out I'm guessing he's still grinding

Now its 6 1/2 years old and STILL grinding..
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Old 11-29-2010, 11:59 AM
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Originally Posted by 65smallblock
Now its 6 1/2 years old and STILL grinding..
You know how it goes; the cutter gets clogged up with aluminum and slow you down.

Bogie
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Old 11-30-2010, 03:31 AM
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the short answer is.. even if you could, why would you!?
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