question about the dp
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Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
question about the dp
Well on my truck I have the carb sitting the right way but right now the throttle cable sometimes it get stuck at times because it to close to the heater box and my friend its best if I turn the carb the other way. But I told him the primaries have there own spot as well as the secondaries. But then he told me that as long as the intake feed all six I should be okay. Do you think this really matter I remember when I first got the intake it said why the intake sit how it does but I lost it.
Lead Driver
Joined: Mar 2008
Posts: 7,168
Likes: 375
From: Near Los Angeles
With the DP the throttle linkage should be facing the firewall. Both the primaries and the secondaries have separate channels that the air/fuel mix travels. The primaries travel a smaller channel, and the s. travel a larger one beneath the p. channel. When they reach the head they mix. That affect is supposed to create economy and performance. If you change the orientation of the carb on the manifold, you defeat the purpose of the dp.
Elder User
Joined: Jul 2004
Posts: 911
Likes: 2
From: Northern Virginia, USA
In addition to the performance design, the dp primary runners are much smaller than the secondary runners. If you rotate the carb, you will get uneven draw on each half of the carb.
Also, primaries are on the bottom of the dp manifold for manifold heat & driveability. Linkage towards firewall.
Also, primaries are on the bottom of the dp manifold for manifold heat & driveability. Linkage towards firewall.
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Laughing Gas
Joined: Dec 2010
Posts: 924
Likes: 1
So many of you may frown on this but my friend and i turned my carburetor around, just to see if the throttle linkage would bind up like it did when it was turned the "correct" way, and it didn't at all. With the carb this way i noticed right away that it idled way smoother and it even picks up way better then it did before. Maybe i had it sitting the wrong way the whole time. ha ha. 
Junior User
Joined: Jul 2011
Posts: 59
Likes: 0
From: Pittsburgh
I, too, am curious about this. As of right now, my throttle linkage is facing the front of the truck. I have some bogging under WOT; could this be the source of my problem? I have an Edelbrock 500 mated to the Offenhauser DP intake, via a generic spacer from Auto Zone.
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Elder User
Joined: Nov 2004
Posts: 666
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IIRC On the 6019-DP the smaller runners are on the bottom. These are fed by the two carburetor holes closest to the engine. Your carb should be mounted sideways with the primary bores closest to the engine.
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Postmaster
Joined: Dec 2006
Posts: 3,603
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From: Spokane, WA
Brad_81Ford: Do you have heat plumbed to the intake? If not, therein lies a good part of your problem. If you do have heat then the air flap on the secondaries needs to be adjusted so the do not open too soon.
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
I, too, am curious about this. As of right now, my throttle linkage is facing the front of the truck. I have some bogging under WOT; could this be the source of my problem? I have an Edelbrock 500 mated to the Offenhauser DP intake, via a generic spacer from Auto Zone.
Like this.
Junior User
Joined: Jul 2011
Posts: 59
Likes: 0
From: Pittsburgh
If that's the case, I'll just remove the intake and exhaust manifolds to get at the bottom of the intake. From my experience, trying to bolt it up while the intake was installed turned out to be a big PITA. I'll also turn the carburetor around. That should solve a lot of my issues, it seems.
Cargo Master
Joined: Jan 2004
Posts: 2,512
Likes: 8
From: Cook Forest and Irwin PA
just promise me that when you are done, 1 primary feeds each of the planes, and 1 secondary feeds each of the planes, or both primaries fee 1 plane, and the secondaries feed the other plane.
Moderator
Joined: Dec 2007
Posts: 7,986
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From: Boise, Idaho
Not only that, but the air/fuel mix moving through the intake will actually cool it down.
On a 100° day, I drove for 3 hours on the interstate and when I reached my destination, I hopped out and put my hand on the underside of the intake (when there was no coolant plate), and it was cool to the touch. It wasn't even remotely hot. I would wager it was 10 - 20° less than the 100° it was outside.
If that's the case, I'll just remove the intake and exhaust manifolds to get at the bottom of the intake. From my experience, trying to bolt it up while the intake was installed turned out to be a big PITA. I'll also turn the carburetor around. That should solve a lot of my issues, it seems.
Elder User
Joined: Jul 2004
Posts: 911
Likes: 2
From: Northern Virginia, USA
Manifold heat is required, even in the summer. Look at an aviation carburetor icing chart. A venturi or throttle will get cold enough to form ice even at 100F air temperature without external heat.