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Rev · 09-10-2002, 04:08 PM

Road draft tubes were angled in such a way that when the car was moving, a low pressure was created at the end that actually "sucked" the vapors from the crank case. If there is a lot of blowby, then a positive pressure resulted in the crank case and the road draft tube would belch smoke even if the car was idling and sitting still.

BTW, Ford must have introduced the PCV system on the 289 in '66, because mine came with the PCV.

Rev

09-10-2002, 04:08 PM	#14
Rev Registered Member Join Date: Nov 1998 Location: Houston, Tx. Posts: 3,887	Suction Road draft tubes were angled in such a way that when the car was moving, a low pressure was created at the end that actually "sucked" the vapors from the crank case. If there is a lot of blowby, then a positive pressure resulted in the crank case and the road draft tube would belch smoke even if the car was idling and sitting still. BTW, Ford must have introduced the PCV system on the 289 in '66, because mine came with the PCV. Rev __________________ '66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi. O.B.C. #2 '66 coupe