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3X2 Intake Manifold Testing - Results.

Posted By Ted 15 Years Ago
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Ted
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Dyno testing is now complete on the 3X2 intake manifolds.  The Edelbrock 573 was at the top of the heap with the Offenhauser being at the bottom.  There was a 29HP difference between the best and the worst which is a bunch.  The dyno test range for each test was 2500-5500 rpms.  Besides looking at both the peak and average horspower and torque values, the engine performance with each intake was also ‘scored’ to get a better feel for overall performance using a single value.  The score is calculated by adding both the average HP and torque together and dividing that into the cubic inch of the engine and then multiplying that value by 1000.  Testing concluded with the first intake being rerun at the tail end as a validation that the engine was holding steady and because there was still some time left at the end of the day, the new Mummert intake was installed with a 600+ vacuum secondary Holley on top of a 2” four hole spacer and also ran.

 

Here’s how the various 3X2 manifolds ranked in overall performance from the top to the bottom.

1. 1703.7 pts - Edelbrock ‘573’

2. 1674.7 pts - Edmunds ‘DM-425’ large port

3. 1672.4 pts - Edelbrock ‘553’

4. 1667.7 pts - Edmunds ‘DM-424D’ small port

5. 1661.2 pts - Weiand ‘FM436’ large port

6. 1646.9 pts - Edmunds ‘FORD 424’ small port

7. 1561.2 pts - Offenhauser w/no identifying numbers

 

The test engine is a +060 over 312 with 9.2:1cr, dead stock ‘G’ heads, and Harland Sharp 1.6:1 rockers.  The same Stromberg carbs were used on all the manifolds without any jetting changes once manifold testing commenced.  The camshaft is a Crower Monarch with 238° @ 0.050”, ground on 110° lobe centers, installed 2° advanced, and 0.434” lift at the valve after valve lash.  All testing was performed with four tube headers running through Magnaflow mufflers.  This series of 3X2 intake manifold testing is also part of the durability testing being performed on the prototype Harland Sharp rockers which so far appears to be holding up fine.

 

For those of you that live and breathe horsepower and torque numbers, here are the peak values for the 3X2 intake manifolds but are still being listed in their order of scoring.

1. 336.0 Tq / 279.3 HP - Edelbrock ‘573’

2. 336.1 Tq / 266.5 HP - Edmunds ‘DM-425’ large port

3. 334.1 Tq / 270.1 HP - Edelbrock ‘553’

4. 338.6 Tq / 260.1 HP - Edmunds ‘DM-424D’ small port

5. 332.1 Tq / 266.2 HP - Weiand ‘FM436’ large port

6. 330.4 Tq / 261.9 HP - Edmunds ‘FORD 424’ small port

7. 311.5 Tq / 250.8 HP - Offenhauser w/no identifying numbers

 

And here’s the order in which the intakes were run on the engine.

1. Edelbrock ‘573’

2. Offenhauser w/no identifying numbers

3. Edelbrock ‘553’

4. Weiand ‘FM436’ large port

5. Edmunds ‘FORD 424’ small port

6. Edmunds ‘DM-424D’ small port

7. Edmunds ‘DM-425’ large port

8. Edelbrock ‘573’ (reinstalled to validate earlier run)

9. Mummert single four intake with 600 Holley (291.9HP / 346.0Tq)

 

Intake manifold changes were down to 35 minutes each at the end.

Lorena, Texas (South of Waco)


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Ted
Posted 15 Years Ago
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Y block Billy (3/6/2010)
.....Do you have any low end torque numbers you could post? Most people don't get to hold their cars at the peak horse rpms very often, but they like the off the line tire fryer capabilities at the low end torque scale.
Billy.  Here are the lowend torque numbers and are rounded off for easier viewing.  The new scoring order is in the bottom row if simply basing the performance of each intake on its lowend torque values.  The Edmunds DM-424D in this format would be the best from a daily driver point of view but all the Edmunds 3X2 intakes still look good.  No matter how you look at the Offenhauser intake though, it just comes up short.

 

rpm

Edel 573

Edmunds DM-425

Edel 553

Edmunds DM-424D

Weiand

Edmunds Ford 424

Offy

2500

292

303

296

309

293

294

277

2600

305

314

308

320

306

306

287

2700

313

323

316

328

316

314

294

2800

321

329

322

334

322

319

300

2900

325

332

327

336

327

323

305

3000

328

333

330

337

330

326

308

3100

330

334

332

338

331

327

310

3200

333

335

333

338

332

328

311

3300

334

336

334

339

332

330

311

3400

335

336

334

338

332

330

311

3500

336

336

333

337

332

330

312

Avg

322.9

328.3

324.1

332.2

323.0

320.6

302.4

Order tested

 

1&8

 

7

 

3

 

6

 

4

 

5

 

2

Overall scoring order

 

1

 

2

 

3

 

4

 

5

 

6

 

7

Revised scoring order

 

5

 

2

 

3

 

1

 

4

 

6

 

7

The two Edmunds 424 intakes are different in appearance at the backs of the manifolds and obviously came from different molds.  One has 'Ford 424' on it and the other 'DM-424'.  The DM-425 and DM-424 manifolds each have ‘425’ and ‘424’ cast also on their insides in a couple of places but the ‘Ford 424’ manifold does not have those same identifiers on the inside of the manifold.  Both the 424 intakes are small port versions though whereas the 425 is a large port intake.  Looking at your Edmunds 3X2 intake, I can see where it has been repaired on the inside but the repair doesn’t look to be a problem.



Lorena, Texas (South of Waco)



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Forum Post 3X2 Intake Manifold Testing - Results. By Ted ( 15 Years Ago )
Forum Post And here’s a shot of all seven 3X2 intakes that were tested.... By Ted ( 15 Years Ago )
Forum Post Ted, Thanks for doing this! Very interesting the difference in HP... By YellowWing ( 15 Years Ago )
Forum Post Ted,

Wow....that is an impressive test. Thanks very much...
By MarkMontereyBay ( 15 Years Ago )
Forum Post [quote][b]YellowWing (3/4/2010)[/b][hr]Ted, Thanks for doing this!... By aussiebill ( 15 Years Ago )
Forum Post Ted - in a word, WOW! :w00t: What great stuff! Sounds like a nice... By Daniel Jessup ( 15 Years Ago )
Forum Post I'm surprised to see how close the Edelbrocks are to one another. It... By charliemccraney ( 15 Years Ago )
Forum Post Thanks Ted. Although I'm running the 553 it sure outdid the Offy I had... By lowrider ( 15 Years Ago )
Forum Post Excellent information Ted! Thanks for all the work and the clear... By BIGREDTODD ( 15 Years Ago )
Forum Post This is a good reason to be here, among many others, you just don't... By mctim64 ( 15 Years Ago )
Forum Post Awesome research work Ted! By joey ( 15 Years Ago )
Forum Post Fine work, Ted!
Thanks again for all the hard work you do for the...
By bird55 ( 15 Years Ago )
Forum Post Ted, thanks for all your research and tests. I almost can't believe I... By Cactus ( 15 Years Ago )
Forum Post Thanks for the testing Ted. Appreciate all the work. By BFOOTER03 ( 15 Years Ago )
Forum Post Thanks for spending the time to do the test for the rest of us. It is... By gritsngumbo ( 15 Years Ago )
Forum Post Ted, A big "Thank You" to you and your crew for the comprehensive... By Nick Brann ( 15 Years Ago )
Forum Post Which Mummert 4bbl intake was used? The new one or the Blue Thunder? By paul2748 ( 15 Years Ago )
Forum Post Hey Ted; Sure appreciate you taking the time to help us all-- with... By Eddie Paskey ( 15 Years Ago )
Forum Post [quote][b]paul2748 (3/4/2010)[/b][hr]Which Mummert 4bbl intake was... By Ted ( 15 Years Ago )
Forum Post Thanks Ted super cool don't see that info very often anymore. By 57 ranchwagon ( 15 Years Ago )
Forum Post AGAIN, TED THANK YOU FOR ALL THE WORK YOU DO TO MAKE THIS ONE OF THE... By ecode ragtop ( 15 Years Ago )
Forum Post I'll chime in...Fantastic job Ted! You are truly an asset to Y-Block... By Philo ( 15 Years Ago )
Forum Post [quote][b]Philo (3/5/2010)[/b][hr]Which model Strombergs were used?... By Ted ( 15 Years Ago )
Forum Post Awesome test Ted. That took an hour or two! Where would the "B" intake... By pegleg ( 15 Years Ago )
Forum Post pegleg.. I think the edelbrock 573 came out in '57 and the 553 in '55,... By bloodyknucklehill ( 15 Years Ago )
Forum Post Good job Ted. The only other manifold I would have liked to have seen... By PF Arcand ( 15 Years Ago )
Forum Post Hi Ted, Great article and nice to have one's judgement about the... By Doug T ( 15 Years Ago )
Forum Post [quote][b]Doug T (3/5/2010)[/b][hr]BTW The HRM/Edelbrock test finally... By Ted ( 15 Years Ago )
Forum Post Great Job Ted! Couple questions while you still have the intakes on... By Y block Billy ( 15 Years Ago )
Forum Post [quote][b]Y block Billy (3/6/2010)[/b][hr].....Do you have any low end... By Ted ( 15 Years Ago )
Forum Post Ted did you record vacuum during your 3x2 tests? I was wondering if... By RB ( 15 Years Ago )
Forum Post Royce. All I have for manifold vacuum readings for the 3X2... By Ted ( 15 Years Ago )
Forum Post [quote][b]RB (3/7/2010)[/b][hr]Ted did you record vacuum during your... By Ted ( 15 Years Ago )
Forum Post This continues to be a very interesting discussion. The flow area in... By Doug T ( 15 Years Ago )
Forum Post Doug, i would be curious what the modifications of the 94 carbs were?... By aussiebill ( 15 Years Ago )
Forum Post [quote][b]aussiebill (3/8/2010)[/b][hr]Doug, i would be curious what... By Ted ( 15 Years Ago )
Forum Post [quote][b]Ted (3/9/2010)[/b][hr][quote][b]aussiebill... By aussiebill ( 15 Years Ago )
Forum Post [quote][b]Doug T (3/8/2010)[/b][hr]....It would also be interesting to... By Ted ( 15 Years Ago )
Forum Post Ted, during the testing with the Strombergs were you using vacuum... By The Master Cylinder ( 14 Years Ago )
Forum Post Bill & Lon. Thanks for the accolades.[hr] [quote][b]The Master... By Ted ( 14 Years Ago )
Forum Post Ted , Ditto to what "Cusso Bill " said .You are truely a living... By LON ( 14 Years Ago )
Forum Post Ted, just being curious, but how many runs do you think you have made... By Fordy Guy ( 14 Years Ago )
Forum Post WHY????
I am wondering why you would think the Y-block would be...
By fairlane bob ( 14 Years Ago )
Forum Post [quote][b]Fordy Guy (11/26/2011)[/b][hr]Ted, just being curious, but... By Ted ( 14 Years Ago )
Forum Post The reason I bought the MSD for my Vicky was the lack of vacuum... By MoonShadow ( 14 Years Ago )
Forum Post Thanks, Ted. I looked up the instructions on the MSD Distributor and... By The Master Cylinder ( 14 Years Ago )
Forum Post I guess I will have to buy a John intake manifold for my 55 ford f-100... By juangonzales30 ( 14 Years Ago )
Forum Post the fenton intake has DM425 on the back, same as the late edmunds. By yalincoln ( 13 Years Ago )
Forum Post [quote][b]yalincoln (2/11/2012)[/b][hr]the fenton intake has DM425 on... By Ted ( 13 Years Ago )
Forum Post i just looked at a fenton, DM424, same as edmunds, small ports. they... By yalincoln ( 13 Years Ago )
Forum Post What street mileage would you say is the equivalent of 400 pulls? By Ivan M. Thoen ( 13 Years Ago )
Forum Post [quote][b]Ivan M. Thoen (9/23/2012)[/b][hr]What street mileage would... By Ted ( 13 Years Ago )
Forum Post Looking forward to your dual quad testing information, Ted.
...
By NoShortcuts ( 13 Years Ago )
Forum Post i hope i get this right...thank you for all the information.Now that... By 63 f100 longbed ( 13 Years Ago )
Forum Post According to an article in YBM way back, as I recall, the Offy down... By PF Arcand ( 13 Years Ago )
Forum Post If you aren"t going to go raceing and just going to use the center... By carl ( 13 Years Ago )
Forum Post I have the offy- I did get it for a cheap price. It is definitely... By Riz ( 13 Years Ago )
Forum Post [quote][b]Riz (2/23/2012)[/b][hr]I have the offy- I did get it for a... By aussiebill ( 13 Years Ago )
Forum Post Here’s a graph displaying the torque curves for three of the 3X2... By Ted ( 13 Years Ago )
Forum Post The 292 was factory with about 180 hp, I would say conservatively I am... By Riz ( 13 Years Ago )


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