GMHTP has an interesting article comparing a stock manifold to an Edelbrock air gap.
Turns out that even with a 52mm TB, the airgap is barely worth 4rwtq on a mildly cammed (210/210) + bolt-on 355.
It actually LOST power with a stock TB mounted on it.

Page 72 of this month's issue. (just got it today)


So much for "significantly improving output between 1500-6500rpm. LOL

I would like to see what it's like ported (vs a stocker ported)
But I suspect that the results will be just as disappointing.

 

hmm interesting, do they have a chart showing the difference???

 

Surprise surprise!

 

They have internal measurements and dyno results.

Plenum volume= 3670cc (stock) VS 2632cc (Edelbrock)

Runner Length= 2.780in (stock) VS 3.200in (Edelbrock)

Runner Cross-Section
At Gasket = 2.27sqin (stock) VS 2.32sqin (Edelbrock)
At 1.30in = 2.11sqin (stock) VS 2.26sqin (Edelbrock)
At 2.70in = 2.21sqin (stock) VS 2.52sqin (Edelbrock)

Peak HP 350.4 (stock) VS 346.8 (Edelbrock with 48mm) VS 350.3 (Edelbrock with 52mm)
Peak TQ 386.7 (stock) VS 387.7 (Edelbrock with 48mm) VS 391.3 (Edelbrock with 52mm)

 

wow who would have guessed that??? i feel sorry for the people that bought the revolutionary air gap manifold.

 

As they stated in the article, the ports did not match up well with the factory LT1 heads. The intake was apparently meant to mate properly with the Edel LT1 heads. The next installment will be a retest with the proper port matching. No one expected these to do great but I'm curious to see the next installment.

 

I'm looking forward to laughing at ...er ... I mean seeing the results as well.

 

I got one that has been worked over pretty good, show flow decent

4rwhp from a 210/210 bolt-on 355 LT1 is not great, but IMO stick a little larger cc503 (224/230) camshaft on with some good heads and the numbers would go up decently probably double. For most people a ported stocker would work great thats been ported. IF you need an LT4 setup this would be the ticket.

 

I'd not be surprised if they stuck the LT4 intake on the stock heads.

It's all on GMPC now.

 

wow..i was almost thinking of getting one of these...im saving my money for something else

 

I was waiting for some1 to say this. It'll be interesting to see the results with the E-RPM vs stock when each are mated to a set of the Edelbrock heads. If the air starts gett'n stupid before it ever gets the chance to enter the port of the head then negative results will take place.

Now, make no mistake about it, I don't expect this thing to change the world, I've had my doubts as much as anybody else, but I do think we'll see a slight advantage when the cross section of the head port is big enough to stop the air from going stupid. It does prove that it's not a good performance bang for the buck if you think you're just gonna bolt in on a shread tires though, good stuff to know!!!

 

I guess the results from GMHTP can be taken at face value more than I thought. With the gains they get on some things I was starting to wonder if they were pulling dyno tricks to help sponsors. This gives me more piece of mind. Now if only my new issue would show up, lol.

 

Is it really over 1000cc less plenum volume than stock or is that a typo?

If it is truely that much less, you can bet that this thing won't perform on motors that spin higher rpm or have larger displacement.

 

I didn't even catch that, and I'm willing to bet with 99% certainty that it's a typo mean to be a 3, not a 2.

 

YEA I SAW THAT RIGHT AWAY AND WAS LIKE BAMN! WOW THATS A BIG DIFFERENCE.

 

im glad i didnt waste my money!

 

im willing to bet on a 383 with a 230x cam and 190-200cc heads it works killer... but a ported stocker is cheaper..

although the carb air gap intake is the best intake out there.
i think if the motor is built for it, it will make some real nice power. its like sticking a victor or victor JR on a stock 350 and hoping the 5" tall single plane intake will make 100hp more.


aaron

 

Not that there have been much in the way of results sofar but this test does backup the little bit we have seen. Now admittedly the previous best test we had was not great. It was different dynos, different days but only showed 5hp/12tq on a 370rwhp car. IMO that is pretty well in line with what this test showed us. The slight gain could be attributed to the port better matching as opposed to the missmatch you guys are putting all your hope in far as why this test was so bad.

Look at it this way, the full Edelbrock kit, heads, cam, intake is worth LESS than 400flywheel HP, pretty solid proof none of it is worthwhile.

 

I dont expect there to be much either, theres no way edel could have come up with an intake so fast AND made it actually be worth something decent on a dyno.

The time simply was not put into it, its basically just a copy with a couple things tweeked slightly. The numbers reflect this.

 

Wow a loss in HP were do I get one of these bad boys??? But really Ive ordered my H/c and Im looking into intakes now. Now what should I do?? Lt4 and port match, aftermarket or port the stocker????