I'm preparing for a dyno test where a variety of 3X2 intakes will be tested on a +060 over 312 Ford Y-Block. Although I already have on hand both the large and small port Edelbrocks, a Weiand, the Offy, and a couple of different Edmunds 3X2 intakes, I still need a Fenton example in which to test. If there is anyone out there that has a Fenton intake that could be loaned for this test, please contact me by phone so we can make arrangements on shipping and getting it back to you at the conclusion of the tests. Thanks, Ted Eaton Eaton Balancing 1060 Wolf Creek Road Lorena, Texas 76655 254-857-3339 CST business hours
Cool! I can't wait to see the outcome. I've got a Weiand that I'd love to know the performance of and where it ranks in comparison. What will you be running for carbs?
The carbs are Stromberg 97's. Will likely be jetted #48's all the way around as the engine is just a tad on the lean side right now with 48's in the center and 45's on the ends. That's with a 573 intake right now. The results will be posted on the Y-Bloocks Forever site when this is all said and done. Looks like next week for the testing but would sure like to have a Fenton intake included in this round of testing. I'll pay shipping both ways if someone has the intake sitting on a shelf.
No Fenton 3X2 intakes showed up so they were not reresented in this particular dyno test. But research is pointing to the Fenton and Edmund intakes being cast in the same molds so there may or may not have been a difference in these. The Edelbrock 573 at 279 horsepower has proved itself to be the best performer of the seven 3X2 intakes that were tested. It was 29 horsepower better than the Offenhauser which was at the bottom of the list in regards to performance. Three different Edmunds intakes were tested and the newer the intake, the better its overall performance. The Offy intake was the only intake in the group that was not a true dual plane as the Offy had a common plenum under the carbs and only a 4 divider to split up the flow before going to the intake ports at the heads. The engine itself is a stock headed (no port work) +060 over 312 that still has the pistons ~0.025 in the hole with 9.2:1cr and using a Crower Monarch camshaft and Harland Sharp 1.6:1 aluminum roller tipped rockers. The first intake tested (the Edel 573) was put back on the engine at the tailend of the 3X2 testing to validate that the engine was still up to par and it was. The new Mummert single four aluminum intake was placed on the engine after 3X2 testing was concluded and the horsepower number jumped up to 292HP using a modified 600cfm vacuum secondary Holley (List 1850) with a 2 four hole spacer under it. But this intake has thus far shined on everything its been put on so no surprise there.
Thanks again Ted for the test compairison, I thought I'd add the link to the Y-Block site since it gives a more detailed explaination. http://www.y-blocksforever.com/forums/Topic40554-3-1.aspx
interesting to see how the stock fourbarrel intake would hawe performed to...maby better than the offy...
Wow... I shouldn't have read this, hahaha... that 13 hp difference might bug me, no matter my other mods.
Here's the link to the next round, now we can know how the 4Vs will compare. http://www.y-blocksforever.com/forums/Topic40596-3-1.aspx?Update=1
You mention that the newer the Edmunds the better performing...how do I find the age of my intake. I have an Edmunds with DM-4255 on the bottom but have yet to find anywhere that I can I.D. this intake. Any help would be appreciated.
Suffixes on the end of the part number are the easiest way to gauge the age of the manifold. Yours being DM-4255 is likely a later version of the basic DM425 but prior models used letters rather than a number to indicate a revision. Can you post a picture of your particular manifold showing the part number? You might also try looking at the interior of the intake for additional casting numbers as the DM424D and the DM425 I have here do have verifying part numbers cast on both the front and rear intake runner dividers that can be seen when looking into the intake from the port side. Beyond this, I'll not be much help.
Thanks fo the comparasinon Ted If i got this right the factory 4bbl made about the same power with the bad exhaust as the offy 3x2 with the god exaust?
That's right!!! The engine was already at the 250HP mark with a stock manifold and a Holley four barrel carb with the restricted exhaust system. In a nutshell, the Offenhauser 3X2 setup would have been a poorer performer than the factory setup with all else being equal.
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