Edelbrock Intake Manifold Dyno Test :: Single Vs Dual + Air-Gap Vs Regular

Edelbrock single plane (Victor Jr) vs dual plane (Air-Gap) intake manifolds on the same engine in a dyno test at Westech Performance. Plus a test of the Air-Gap vs Regular dual plane intake manifolds. This is an episode I edited.

[augustoescobar]

Pontiac guys have known this for many years. Except we only cut down the back half of the divider so the secondarys take advantage. Test have been done on this with regular performer and Qjets and that lil trick will definitely add power and smooth everything out.

[kevinmcdonough]

I have run several engines with the regular Performer RPM 4150 and a 1” open spacer. They look factory and run well. My last engine was a 468 BBC with a Comp Cam’s hydraulic, similar to the Edelbrock RPM hyd. camshaft. We added a 1” open spacer, under a Holley 850 HP and made 537 hp. This was with a mechanical water pump, NOT electric water pump, but what you typically see on a street car. All run through 2” Hooker Comp headers, 3” full exhaust to rear bumper. In a 3, 925 lb. ‘66 Bel Air, weight with driver, in as driven on the street, except for 9” radial slicks, ran 11.51 @ 116.51 mph. This was with a Turbo Action 10” street converter (tight) with a flash stall of 3, 800 rpm’s.

[Dr_Xyzt]

This is an excellent feature. I can't believe it's almost been 10 years.

[oridionraider]

I have completed the same mods to my Performer RPM 1" spacer and milled divider and it works on my 383 stroker 350 with Victor Jr heads we also port matched the intake and a general clean up on the castings. Great job guy's and in idles sweet as.  

[oldayz]

Great test and very informative but its important to note that a change in cam profile such as something with more over lap for example can throw those results out the window and have a very different out come. There are many different factors to consider, and all engines and set ups should be tested individually. Keep up the good work and look forward to more testing on different combo's.

[rdGenGuy]

KEEP in mind the performer doesn't have the heat riser blocked off,
that could boil gas in the bowls.

The RPM air-gap has the the risers blocked off.

[bradleyhannah]

I used suck, squeeze, bang, blow as a answer to homework when I was going to Harley school in Phoenix in 93 too funny.Other students wrote pages on how a four stroke works all I wrote was those four words .He got a good laugh

[bobwhite]

an additional interesting comparison would be to put a plenum divider in the vic jr and also notch it the proper amount at the top and see how much, if any, low and midrange torque the vic jr can gain on the air-gap dual plane. it would also show if the divider in the vic jr would cost some high rpm hp.

[marsv]

Great info guys !!!, I just built a 355 SBC, AFR 195 and a solid roller 242/248 @ 0.050 with 570 lift, Victor Jr, 10.7CR and 750 carb, we made 481 and 428 fts lbs. I have a video on my youtube page. It's in a manual car so very spongy below 4000 rpm, we were thinking of going the Air gap to fire up the bottom end a bit. This video has help alot. Cheers from Australia . Mario

[rightsidelanechoice]

Well the Quad adapter makes it an open plenum so your chasing your tail for an accurate test.

[arodderz]

Great video. Really wanted to see the 1 inch spacer on the air gap rpm though. that's what's going in my 383 next week so hopefully makes a difference over the regular rpm in my setup

[beaversstumpgrinding]

Keep in mind the reason for the air gap is to keep fuel temps cooler...so for my money the air gap is my choice on cruise night, cross country, or towing. Pontiac did this on all it's factory V-8's.

[Pooslingingmonkey]

A single plane intake will always make more hp than a dual plane intake. Just at a higher rpm. This is a very old video, but I recall them doing the test again on Engine Masters and of course the single plane won.

[spencemyers]

Great review guys. I run an Air-gap on my 318 mopar. 

[garyvaughan]

Good to go back in setup is very similar, (PN 2101, ground down center, dual plane /spacer ), touch the accelerator... It jumps !!!

[rdublx]

I really want to see them chuck that intake up on a lathe...

[Sn]

How long has fred durst been into engines??

[draperture]

Something that rarely gets covered in these tests is carburetor changes and tuning.
A larger CFM, Annular boosters and tuning would change quite a bit of the outcome.
The AirGap wouldn't be able to utilize the extra air volume but would be much more in line with recommendations for the Victor Jr.
This type of testing is "step one" of dozens of tests needed to draw the multiple conclusions on these setups.
Using the same carb and no tuning is like using the same tires on both a quarter mile vehicle and on a road course!
Great video but lets see the other 98% also.

[bullfidde]

Dual plane intakes been around for a long time.
I have a Edelbrock C3BX that's really vintage.

[zxtenn]

I think you meant Bridgeport for milling not LATHE-- people used to cut that down 30 years ago but great to see it works on the dyno for actual proof