Charlie.  Thanks for the reminder on Charlie Dover’s dual quad setup in his ’56 wagon.  His wagon was quite streetable with the dual quads and the carb linkage exhibited some really nice engineering for the sideways turned carbs.  The working cruise control is also a nice touch.

Lorena, Texas (South of Waco)

Bill. Thanks for the pics of the Cain dual quad manifold. Design wise, it resembles the Cain single four intake.

---

An Offy dual quad was not made available so that one obviously will not be tested during this session. I do have an Edelbrock 257 here that has had its plenums hogged out and that by itself will give a rough idea of what the Cain manifold might be capable of. I suspect lowend torque values will be dismal. The modified Edelbrock manifold does still have some divider material left at the ports whereas the Cain intakes have no port dividers at all so that must be taken into account. Here’s a picture of the modified #257.

Lorena, Texas (South of Waco)

Testing is in process and is currently taking place with the ported 113 iron heads on the engine.  Teapot carburetor jetting is a time burner though.  It takes about as long to rejet a pair of Teapots as it does to do an intake manifold change so you see where the time goes in a hurry.  The factory ’57 setup though is a well engineered piece as delivered from the factory as it is an easy 45 horsepower improvement over the ‘A’ manifold with a single Lincoln Teapot.  But there’s still lots of carbs/intake combinations left to test and at some point, the aluminum heads will go on the engine to retest the better intake/carb combinations.

 

Once the testing is concluded, I’ll post some kind of chart that allows an ‘at a glance’ comparision.

Lorena, Texas (South of Waco)

Not wanting to distract from Ted's testing but I came upon this article when doing some researce. http://www.mustangandfords.com/techarticles/engine/mdmp_1206_dual_quad_carburetors_testing_part_1/viewall.html

http://www.mustangandfords.com/techarticles/mdmp_1207_dual_quads_twin_win_or_double_trouble_part_2/trans_am_dual_quad_intake.html

I had always thought that dual quads were down just a bit on a single four but this test is showing them 25hp up. I wonder if the technical advatages that were avaliable in the 60's was available during the 50's and learnt when working with the Y block?

Cheers

Warren

Grizzly (Aussie Mainline)

---

What I’m seeing so far in the dual quad testing is that the ‘made in the Fifties’ dual quad intakes as a general rule easily outperforms the factory single four barrel intakes for the time and especially the Teapot 4V intakes by a bunch. But when compared to the Blue Thunder or Mummert aluminum single four intakes, the old school dual quad intake manifolds do come up short. If a new dual quad intake was to be designed with the same modern technology that’s used to make the BT and Mummert intakes, then the potential is there for an increase in performance.

---

A case in point is a Ford 390 I recently dynoed with the 427 single four Sidewinder intake, the C8AX dual quad tunnel wedge intake, and an Edelbrock Victor single four manifold. While the C8AX manifold with any of three different pairs of carburetors easily outperformed the Sidewinder intake on the order of 15-20 HP (dependent upon which carbs were used), the Edelbrock Victor single four manifold was still worth a couple of HP over the C8AX. That’s just modern intake design technology coming to the forefront.

Lorena, Texas (South of Waco)

hi ted, can you send me a copy of your findings, thanks, wayne. here's my intake-

 lincoln/merc. y-blocks &mel's                                                               bucyrus, ohio.

Wayne. Do you still get the Y-Block Magazine? The iron head dual quad test results are in the latest issue (#115) while the aluminum head test results are coming out in the next issue (#116). Part III of that article will cover the results from the various air cleaner testing which will be in issue #117. I’ll be posting the condensed results of that testing here on the site after YBM issue #116 hits the stands. If you don’t get the YBM, just email me and I’ll send you a copy of the magazine article. The preferred email address to use is at www.eatonbalancing.com under contact information.

---

---

I'll add that the Edelbrock FM255 dual quad intake is a good manifold to use both in regards to its performance and its wider carb spacing which accommodates the use of more carburetor designs than the narrower carb spaced Edelbrock 257.

Lorena, Texas (South of Waco)

A little off topic, what were the power figures on that 390, Y-Blocks and F.E.s, my favorite! (With an occassional 385 series thrown in!) Thanks, Mike.

I hope John (Mummert) is reading this and is already in the midst of manufacturing a dual-quad intake for us Y-Blockers...

"Not speeding Officer, qualifying!"

That 390 is 0.030” over with Edelbrock heads and runs on pump gas. With the Ford Sidewinder intake and a 750 Holley carb, 448 HP @ 5600, 426 TQ @ 4500. With the C8AX dual quad intake and a pair of 780 carbs, 465 HP @ 5700, 438 TQ @ 5500. And with the Edelbrock Victor 427 intake using a carb adapter and a 750 vacuum secondary Holley instead of a Dominator carb, 467 HP @ 5600, 447 TQ @ 5300. I'll add that fully porting the C8AX intake to match the heads cost some torque numbers but the horsepower numbers remained the same. The C8AX numbers above are the ported numbers.

Lorena, Texas (South of Waco)