Thinking of going with a 3X2 set-up
#16
#17
#18
#19
The rap on Offenhauser intakes is that they are single plane intakes. I had one for a while, but as Mike said, I bought it unknowing and I sold if after I got an early Edelbrock 3x2 (553?).
The Offenhauser looked like they had originally designed a 180 but then took out the chamber dividers when it went into production. The problem with the idea of a 360 degree Y-block intake is that the lower ports will get enriched mixtures. I'll bet if y-blockhead reads his plugs, he'll find four are rich/sooty and four are lean/tan.
If/when I finish my 3x2 setup (using Ford 94's), I'll be sure to get the manifold heat system working to help ensure adequate vaporization of the fuel.
The Offenhauser looked like they had originally designed a 180 but then took out the chamber dividers when it went into production. The problem with the idea of a 360 degree Y-block intake is that the lower ports will get enriched mixtures. I'll bet if y-blockhead reads his plugs, he'll find four are rich/sooty and four are lean/tan.
If/when I finish my 3x2 setup (using Ford 94's), I'll be sure to get the manifold heat system working to help ensure adequate vaporization of the fuel.
#20
#22
Isnt the center carb a problem on the Offenhauser? Where does it go (A/F mixture)? Seems like a person would be better off to run two carbs instead of three or one center dumby. But even then there is that large plenum volume. Someone once commented that a backfire with an Offy on top could be interesting. What do you think Wild Bunch?
(How've you been PC)
(How've you been PC)
#24
It looks like the Offenhauser intake is good for about 250hp in stock form. That's more than your engine came with. If it's still on the table, don't hesitate to grab it. It does appear to be the worst of the 3-2 manifolds, though.
3X2 Intake Manifold Testing - Results.
3X2 Intake Manifold Testing - Results.
#25
Ted's results are very interesting and helpful. It looks like the Offy does have some value in the performance area, though not as much as even the stock 4V B manifold. Granted the B doesnt have the nostalgia value as 3X2s.
Ted ran some other dyno tests, and in one report had 1.43 and 1.54 rockers compared in terms of HP. I was real surprised that the 1.54s only gave a 3 HP increase.
Ted ran some other dyno tests, and in one report had 1.43 and 1.54 rockers compared in terms of HP. I was real surprised that the 1.54s only gave a 3 HP increase.
#26
#29
It doesn't matter what engine a 3 X 2 set up is on or being discussed about being on. Most folks don't have carburetor savvy, so they have trouble dialing them in, can't do it and then claim that three two's are no good.
If you have plenty of carb savvy AND you have the patience and time for the project, you can dial them in. The ideal is to have progressive linkage and use a choked carb with slightly larger throttle bore for the center carburetor. Leave the outer two carb linkages disconnected while you dial in the center carb, THEN attack the outer two.
My $0.02,
If you have plenty of carb savvy AND you have the patience and time for the project, you can dial them in. The ideal is to have progressive linkage and use a choked carb with slightly larger throttle bore for the center carburetor. Leave the outer two carb linkages disconnected while you dial in the center carb, THEN attack the outer two.
My $0.02,
#30
It doesn't matter what engine a 3 X 2 set up is on or being discussed about being on. Most folks don't have carburetor savvy, so they have trouble dialing them in, can't do it and then claim that three two's are no good.
If you have plenty of carb savvy AND you have the patience and time for the project, you can dial them in. The ideal is to have progressive linkage and use a choked carb with slightly larger throttle bore for the center carburetor. Leave the outer two carb linkages disconnected while you dial in the center carb, THEN attack the outer two.
My $0.02,
If you have plenty of carb savvy AND you have the patience and time for the project, you can dial them in. The ideal is to have progressive linkage and use a choked carb with slightly larger throttle bore for the center carburetor. Leave the outer two carb linkages disconnected while you dial in the center carb, THEN attack the outer two.
My $0.02,