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Old 11-22-2006, 04:07 PM
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RPM Performer or Air Gap ???

I'm thinking about a new intake manifold along with the other goodies I'm going to use for my next rebuild,hopefully early next year.What advantage or disadvantage is there to having an air gap versus a non air gap intake? I'm thinking about using one of the Edelbrock Performer RPM rectangular port models,I currently have the GM aluminum dual plane high rise # 3933163 model.Looking for opinions on this choice!!

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Old 11-22-2006, 04:46 PM
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Air Gap

Air Gap alows for a cooler air/fuel charge in turn frees up some ponies. It also sits a little higher check your height.
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Old 11-22-2006, 05:48 PM
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yeah man

this guy knows his stuff! the air gap has the gap under the plenums to make the intake air cooler, this in turns makes more power! but be warned that this is a high rise intake and may not clear your hood,and is good to 6500 rpm. this intake will ultimately make more power than the rpm............adam
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Old 11-23-2006, 02:00 AM
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The air gap will keep your inlet temp denser when the engine has been running for some time. It wont heat soak as much.
But if you spend some cash on gettinīthe old ported you will see a good performance gain there.
DoC
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Old 11-23-2006, 03:27 AM
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RPM Performer or Air Gap???

Thanks for the replies,DoC how would I go about porting my original intake? The only thing I have heard about in regards to intake manifold's is to have them port matched,are you saying there is more that could be done?
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Old 11-23-2006, 04:45 AM
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You knife edge the air seperators under the carb, and smooth everything out helping airflow, and you port match them to your new heads, and move accesive material in the runners, you can do this your self, and it will be 20$.
The port match is easiest if you put thin wet paint on the heads and put your manifold on, and when you take it off again you have a nice mark of where the head runner is on the manifold and you grind it of, and smooth everything out.
Ask if you need any more info.
DoC
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Old 11-23-2006, 01:16 PM
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Iīm not familiar withe the intake you have, but I canīt say for sure that the money on a new intake would be well spent.
Yes, the theory is that it will keep the air cooler and free up ponys. Iīve tried both kinds and canīt say it was worth the effort. Another thing about air gaps is that in cool weather the engine can be a bi**h when itīs cold. Itīs keeping the air too cool
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Old 11-23-2006, 02:49 PM
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RPM Performer or Air Gap???

Thanks for the replies.DoC by the seperator do you mean the divider under the carb?I was almost thinking about removing this alltogether.My new heads are supposed to be port matched to the proper gasket,would I be able to use the same gasket to port match the intake?
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Old 11-23-2006, 03:33 PM
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Although I've been flamed for this before... just something that was observed by many independent tests.... Air gap intakes still heat up as much as non-gapped manifolds, it just takes longer. If you think about it, aluminum is an excellent conductor of heat with a high specific heat gravity. The heat just has to go a further distance (out the base and up the runners instead of straight into the runners).

Don't take my word for it, consult Car Craft, Hot Rod, Popular Hot Rodding, or use your own thermometer like I did. On the average, the runners on my Edelbrock 2101 reach 180 degrees in 14 minutes of highway driving. My Vortec Air gap performer takes about 30 minutes of highway driving to reach 180 degrees. That's using a digital laser IR thermometer averaging the temps of all 8 runners. Both have no exhaust crossover. The only difference I did notice was that on the Air Gap the end runners took considerably longer to heat up than the center runners.

In my opinion, the Air Gap should be used for its higher runners which tend to show more hp on the dyno over the non-gap intake, but don't mistake it for a cooler intake charge unless all of your trips are very short.
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Old 11-24-2006, 02:50 AM
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Quote:
Originally Posted by Guy Hiltz
Thanks for the replies.DoC by the seperator do you mean the divider under the carb?I was almost thinking about removing this alltogether.My new heads are supposed to be port matched to the proper gasket,would I be able to use the same gasket to port match the intake?
Donīt. The plenuim wall was put there for a reason
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Old 11-24-2006, 10:23 AM
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You can use the gasket as a skabelon, but i prefer to use the paint method to avoid nicking the gasket.
It is where the runners enter the plenum, you sharpen.
If you grind out the divider in the plenum you have a single plane mani, and unless you have a hi po motor you dont want that, and you will also need a
turtle in the plenum to split the airstream properly.
I have some pic of a ported manifold you can see, but it will have to wait untill tomorrow cuz my own internet is down
The performer rpm is a good manifold to 450 hp, but it is also 300$ + shipment, where your own port is cheaper, like 280$ cheaper, and is good experience and it is cool to have ported it your self.
DoC
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Old 11-24-2006, 10:37 AM
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I have to agree with curtis73 on this about the Air Gap Manifold. I think it is more of a marketing ploy than anything else.
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Old 11-24-2006, 11:04 AM
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I have run both intakes on the same bbc. I have noticed no improvements going from 1 to the other. I then swithced over to a victor and the car picked up throughout the entire rpm range.
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Old 11-25-2006, 10:36 AM
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Quote:
Originally Posted by crazycuda
I have run both intakes on the same bbc. I have noticed no improvements going from 1 to the other. I then swithced over to a victor and the car picked up throughout the entire rpm range.

The Vic Jr is a great manifold, and good room for porting and a turtle.
DoC
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Old 11-25-2006, 05:13 PM
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RPM Performer or Air Gap???

Thanks for all the replies,its much appreciated!From what I've read here I dont think an Air Gap is in my future,but I might see if I can do a little work on my own intake.DoC if you can post some pictures of a ported manifold that would be great.
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