removing draft tube on my 57 371

Old January 18th, 2019, 11:11 AM
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Sid
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removing draft tube on my 57 371

I have removed the road draft tube and run a pvc valve to center Carb on my 3 duce setup it does not seem to be working correct as I keep fouling plugs and keep getting a lot of suet at start up, I was wondering if some of you have had any dealing with this and could clue me in, the engine is fine and has been rebuilt and it is not the problem, I know that the road draft tube can be removed and it can be successfully done. I have added breathers to both valve covers , hope to find out what I am doing wrong.

Thank You ,SID
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Old February 4th, 2019, 07:51 PM
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May have to reduce the vacuum to the draft tube. Maybe just plum the draft tube with small hose to the bottom of the air cleaner. Just like the draft tube used the draft going past the tube. .Plum it to the bottom of the air cleaner with small hose, like 1/2 inch. The draw from the air cleaner should be enough.
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Old February 5th, 2019, 10:48 AM
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Originally Posted by Sid View Post
I have removed the road draft tube and run a pvc valve to center Carb on my 3 duce setup it does not seem to be working correct as I keep fouling plugs and keep getting a lot of suet at start up, I was wondering if some of you have had any dealing with this and could clue me in, the engine is fine and has been rebuilt and it is not the problem, I know that the road draft tube can be removed and it can be successfully done. I have added breathers to both valve covers , hope to find out what I am doing wrong.

Thank You ,SID
Where did you put the PCV valve? Soot at start-up is unrelated to the PCV. When you say "fouling plugs" do you mean oily residue on the plugs or dry black soot?
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Old February 5th, 2019, 02:28 PM
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Is this how you did it?
From the center carb vacuum line to the block?



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Old February 6th, 2019, 06:21 PM
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Sounds like engine is running rich, correct outer carbs?
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Old February 8th, 2019, 05:32 AM
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Thanks for all the reply's, will check all. I ran the line to the center carb base like in your [pic.
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Old February 8th, 2019, 06:12 AM
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You can block off the pcv for a while to see if your issue clears up.
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Old February 8th, 2019, 08:03 AM
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Also your engine is vented through the oil filler cap could this cause the problem by not being a sealed system?.... Tedd
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Old February 11th, 2019, 12:30 AM
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Just wondering if you have some kind of baffle around the PCV valve. If it's exposed to direct splash oil it won't work correctly. Valve covers have baffles to protect the PCV. It's only suppose to remove fumes. I've been heavily researching PCV valves recently and came across this adjustable unit I want to try. A little pricey but I talked to the owner and I'm sold. Good luck with your project.

http://mewagner.com/?p=444
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