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RPM AIR GAP ????

Don't all big block mopar wedge engines have an "AIR GAP" intake by DEFAULT ????

just thinking out loud

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RPM AIR GAP ????

Don't all big block mopar wedge engines have an "AIR GAP" intake by DEFAULT ????

just thinking out loud

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At the risk of starting a big brawl I'll say that I do not think the big block Performer RPM intakes are "air gaps". It is true that they have an air space under them, but I think the term "air gap" means that the exhaust gas crossover has been eliminated. The SB "air gap" has an actual air gap on the sides of the intake. The BB intakes have the crossover connected. A Victor, or Super Victor intake for the BB are "air gaps" since the crossover has been eliminated. Anyway, that is my take on the subject. I think that Edelbrock also views the subject this way since they have both a Perf RPM for the SB (#7161) that has the crossover, and they have an Airgap RPM (#7576) without the crossover. The BB version is called an RPM not an airgap since it has the crossover.

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RPM AIR GAP ????

Don't all big block mopar wedge engines have an "AIR GAP" intake by DEFAULT ????

just thinking out loud

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Yep, that would be correct John. The turkey pan creates the "air gap" between the manifold and the hot engine lube.


The SB mopars don't have a turkey pan and the bottom of the intake itself seals in the oil. The SB airgap design creates the same open space that BB engines have.

The original SB RPM dual plane was a non airgap design and the updated version has the runners raised off of the sealing surface, hence the airgap moniker.

From the Eddy website :

"The air-gap design features an open air space that separates the runners from the hot engine oil resulting in a cooler, denser charge for more power."

http://www.edelbrock.com/automotive_new/mc/manifolds/chrysler/chrysler.shtml


Compare pix of the standard SB RPM to the Airgap RPM and the difference will be obvious.

***For purposes of this discussion ; "Air Gap" has nothing to do with heat crossover....at least not in terms of the way that it is referenced by Edelbrock.


Back on topic : I like the Airgap RPM for that build as well. Buzz, are you planning to dyno it ?



Ron

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RPM AIR GAP ????

Don't all big block mopar wedge engines have an "AIR GAP" intake by DEFAULT ????

just thinking out loud

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At the risk of starting a big brawl I'll say that I do not think the big block Performer RPM intakes are "air gaps". It is true that they have an air space under them, but I think the term "air gap" means that the exhaust gas crossover has been eliminated. The SB "air gap" has an actual air gap on the sides of the intake. The BB intakes have the crossover connected. A Victor, or Super Victor intake for the BB are "air gaps" since the crossover has been eliminated. Anyway, that is my take on the subject. I think that Edelbrock also views the subject this way since they have both a Perf RPM for the SB (#7161) that has the crossover, and they have an Airgap RPM (#7576) without the crossover. The BB version is called an RPM not an airgap since it has the crossover.

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Thanks for clearing that up , I didn't know there was such an intake available .

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whoops , I read your reply wrong Andy , you were talking about the differences in the SMALLBLOCK MANIFOLD , I thought there was such an animal as an AIR GAP RPM for a BIG BLOCK , but there IS NOT according to the link Ron posted ?



back on topic ...

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Actually the deleting of the exhaust gas crossover is what makes the intake an "airgap". Take a look at the pictures on the Edelbrock website and you'll see that is how they define it for the SB intakes. The BB intakes aren't called air gaps by Edelbrock.

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DEFINATELY not called Air Gap when its a Big Block manifold. B or RB version. Simply a Performer RPM, period. Small blocks now they make and sell two versions currently. Performer RPM which looks like a LD340 basically and designed like any run of the mill SB intake as far as being one solid piece. And then the Small Block Performer RPM Air Gap which looks like a Big Block intake simply because the runners are raised up away from the solid bottom of the manifold covering the engine creating an "AIR GAP" between them and the rest of the manifold.


RB Performer RPM 7193



B Performer RPM 7186



Small Block Performer RPM 7176



And last but not least the only one called "Air Gap" in a Mopar intake the Small Block Performer RPM Air Gap
7576



They all have heat crossovers except the 7576 but its called an "Air Gap" because of the raised runners. And like John basically said, all single 4 barrel BB wedge manifolds already have this feature from Ma Mopar. So no sense in Edlebrock trying to attach that moniker to them thus they are simply called Performer RPM's. If you want to lose the heat crossover then block it. They just couldnt give you that option on the Small Block 7576 because of the design of the raised runners.

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Actually the deleting of the exhaust gas crossover is what makes the intake an "airgap". Take a look at the pictures on the Edelbrock website and you'll see that is how they define it for the SB intakes. The BB intakes aren't called air gaps by Edelbrock.

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