After looking a one of the other threads where people were commenting about our products Mr. Grant decided to have us throw a 350 on the dyno and run a head to head test between an Edelbrock®, and a comparable Demon™.

We used a basic 350 test engine with a .220 @ .050” cam, Dart Iron Eagle heads, and dual plane intake manifold. All tests were done within 20 minutes of each, and repeated to back up the results. The oil temperatures and water temperatures were within 1 degree of each other from test to test.

We ran a 600 CFM Edelbrock® vs. a 575 Speed Demon™, and averaged the numbers between 3300 RPM & 5500 RPM. Here is what we found.

The Edelbrock® averaged 362.57 HP, and 302.5 Ft/Lbs Torque
The Demon™ averaged 374.80 HP, and 312.98 Ft/lbs Torque

This is not something we normally do, but when people are slamming us, without all of the information we need to at least give the information.


Thank you,

Barry Grant, Inc.

Was this an "out of the box" comparison, or did you tune both carbs for optimum performance?

Ed

Ed that was going to be my first question????

Any chances of us seeing the sheets??? With the bsfc?????

Now all we need to do is get Mr. Edelbrock or one of his daughters to read this thread and do the same test and see what results they get!!!!!anyone want to make a bet???



Keith

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K-Star Automotive
Performance Engines
It's better to have a gun and not need it, then need a gun and not have it.

I like the idea of your testing.
Normally you get comarisoms on beefed up, track tuned carbs, but to compare that closely was a good idea. humbsup to you.
Wonder how a couple 575's would work on a mild blown 350 sbc motor?? HG

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I was built with the body of a God! To bad it was buddah.

http://www.hotrodders.com/forum/jou...&journalid=2415

I think the choice of carbs are compairable. What should really happen is two people get together and are given specs on a given engine. Then they are allowed to chose an OFF THE SHELF carb of their maker's type (so one guy from edelbrock, one from BG). They can do tuning ONLY WITH A STANDARD TUNING KIT (i.e. no grinding or modifying the body or parts etc).

They meet at a given dyno shop, the motor is warmed up with a dummy carb, and the two guys get to tune their carbs for a best pull.

Test would be even better if the techs got to use 3 of the same carb, to eliminate a QC problem or something.

K

I like that idea killer.

The testing was done out of the box, to be a fair apples to apples test. This would be very close to what a customer would see in the field. Normally our carburetors will run a lower BSFC based upon how we break up the fuel. I'll have the sheets scanned when I'm back in the office next week, and post them.

Don't think thats gonna happen, everything I've ever seen on the Edelbrocks' cars shows Holleys, not their namesake carbs.

Where I used to work, we dyno tested many engines with both Edelbrock and Holley carbs. No Flames please, but the Edelbrock carbs are more show than go. Every single time, the Holley carb would out perform the Edelbrock.

I am not surprised with the results, I have always tried to tell people that the "Holley" style carbs out perform the Carter/Edelbrocks. The only time I would even think about running an Edelbrock would be on a very mild car that someone didn't know how to tune a carb. They are pretty easy to tune and you can't really get into trouble. You just give up perfromance.

Tech,
I would like you to post this over on the Camaro board as well if you don't mind.

Royce

I have ran both the Edelbrock Performer was a nice piece,I will not knock it for what it does,it does work quite well,seemed to have a little lag though when stomped on,it could be because it was starting to show its age. I replaced it with the Road Demon 625,instantly felt the difference in my seat where it counts,fast throttle response,quicker revs,and just absolutely F'n beautiful.

Good deal Tech! That is a good company to do that!

But... to be fair you really compared apples to oranges, the results are of absolutely no surprise. The real test is a Holley vs BG. out of the box, no tuning, then tuning.

You should also win that one. What you guys have done is basically build the K&N substack into the carb or more precisely port and polish a Holley like my old boss used to do. like my sig you can't read says, "let the wind be your guide" and anybody that knows air can see the BG will out flow the Holley....whether the fuel circuits are up to par i can't say as i've never seen them but i'm willing to bet they are!


And then a thought crossed my mind, i bet you guys run a leaner mixture than a Holley out of the box for best efficiency rather than best torque. Please correct me if i'm wrong.

Since I dont have any experience with BG carbs, but knowing the rep of the company, I dont doubt the results of the test.
On the thought of slamming any particular carburetor, in the tortured and demented world I have lived in for the past 57 yrs, 99.5% of the time, when I heard someone slamming a carburetor, it was because some clown had gotten his fingers into something he didnt know about, and messed something up. Just as "Installer Error" is responsible for the premature death of most all cam installations, so goes it with carbs as well.

I figure until the day I figure out how to make that mystical, superdiscombobulated, double throwdown carb, of my own design that will kick butt on any carb, in any test, of any type, I figure, with my limited talents in that area, Dont have any reason to badmouth any of them.

Any general knowledge of airflow will allow one to see that the "superdiscombobulated" secondary flappers on an Edelbrock/Q-jet will not allow for the most, nor the fastest airflow...resulting in max power losses.