Quadrant Madness
October 28th, 2014, 07:38 AM
#1
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Quadrant Madness
This article details a 4 Q-Jet install on a 425, I saw this at the 06 Olds Nats, Neil and Tom did a great job engineering, probably just to see if it would work..
http://www.enginelabs.com/engine-tec...odding-finest/
http://www.enginelabs.com/engine-tec...odding-finest/
October 28th, 2014, 09:29 AM
#4
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Why does this remind me of Red Green's Toilet Carb?
http://www.google.com/url?sa=t&rct=j...77880786,d.aWw
http://www.google.com/url?sa=t&rct=j...77880786,d.aWw
October 28th, 2014, 11:55 AM
#5
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Location: The Hudson Valley
Posts: 21,183
I'm sorry, but, as stated (between the lines) in the article, an individual-runner QuadraJet system is a dumb idea.
The principle of operation of the QuadraJet secondary metering system anticipates a smooth flow of intake air to hold the secondary air doors open the correct amount to meter the right amount of fuel with the secondary metering rods. The nature of an individual-runner system is pulsatile, and would be expected to completely defeat the QuadraJet's metering system. The decision to use a W-30 cam, which I find truly surprising, could only exacerbate this problem.
If this design is to work, the designers need to look not to combined-intake American car engines, but to individual-runner systems, such as those found in most, if not all, modern motorcycles, and in cars like the Porsche 911.
To make such a system work, you would need a cam grind similar to the ones used by those models, and would almost definitely benefit from using carburetors designed for individual-runner systems, such as certain Webers, Bings, DelOrtos, and Mikunis.
This looks like it was a fun and fascinating project, but one that was destined to fail because it was confined to the wrong parameters.
- Eric
The principle of operation of the QuadraJet secondary metering system anticipates a smooth flow of intake air to hold the secondary air doors open the correct amount to meter the right amount of fuel with the secondary metering rods. The nature of an individual-runner system is pulsatile, and would be expected to completely defeat the QuadraJet's metering system. The decision to use a W-30 cam, which I find truly surprising, could only exacerbate this problem.
If this design is to work, the designers need to look not to combined-intake American car engines, but to individual-runner systems, such as those found in most, if not all, modern motorcycles, and in cars like the Porsche 911.
To make such a system work, you would need a cam grind similar to the ones used by those models, and would almost definitely benefit from using carburetors designed for individual-runner systems, such as certain Webers, Bings, DelOrtos, and Mikunis.
This looks like it was a fun and fascinating project, but one that was destined to fail because it was confined to the wrong parameters.
- Eric
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