Am I crazy? Better flow for the primaries. The secondaries, that come on only for short bursts, would have a much quicker flow to the chambers. Any thoughts? k

 

It will certainly do no harm to try it. At worst, a small loss in performance. At best, a small gain in performance.

 

I've thought about the idea before but I figure they designed it so they know what they're doing. The smaller passages are designed to increase velocity, especially as lower speeds when you need the torque. At those speeds you're not really going to need the large capacity anyway. Then, when it's opened up, the richer, fuller secondaries have the big space to go through. Makes sense to me.
But, as said, won't hurt to try!

 

Then try it with a 1" open spacer and see what that does. No worries to switch back later if it's a dud. You'll never know 'til you give it a go.

 

I've always wondered what the difference, if any, in the volume between the primary side and secondary side. It's not something that can be found in the Offy specs. I think the only way to determine that would be by blocking the ports on the head side and filling the primary side and the secondary side with water and noting any difference in the amount of water used from side to side.

 

From what I saw on the one I had I was guessing the it was around a 70/30 split. But like you said without physically measuring each runner who knows for sure.

 

I don't understand how velocity of air flow will increase torque. The chamber, valves, engine will be taking in the needed amount of AF mix regardless of the velocity, right? I'm not certain, but that sounds a lot like the back pressure myth. It seems like limiting the engine performance the same way putting a small cfm carb on would, by limiting air flow.

I believe the DP was made for near oem engine, slightly raising flow above stock for a 2 or 4v carb, but keeping the cfm down so the flow is not lazy.

**Oh yeah, I wanted to take this opportunity to say how happy I am that I'm "gaining momentum toward becoming a positive member of this forum." That just gives me a warm and fuzzy feeling all over.

 

I think it's the same thing as the smaller primaries. The increase in air speed helps the fuel atomize better when air speed could normally be sluggish, which gives a better pedal response at low RPMs.
But yeah, it was made for near stock engines.

Awww, I've always thought you've had a sunny disposition.