"I have several questions about the draft tube. 1949 216 3600"
Good morning Don.
There is suddenly a lot of interest in PCV systems on this forum and I'm really interested in that too, planning one for my restored '36 Chevy pickup. What PCV valve are you guys planning to use? Are you planning to test the actual internal engine vacuum with the system installed to verify that it is in the 1"-3" vacuum "sweet spot"? Supposedly different valves create different amounts of vacuum.
How will potential vacuum leaks, for example around the oil level dip stick, be controlled?
On the '36 engine oil is put in through a fill tube on the driver's side of the block and the draft tube branches off that fill tube. The draft tube is 1 1/4" OD and is baffled from the fill tube. My plan is to branch another piece if 1 1/4" tubing off the draft tube horizontally near its junction with the fill tube and put the PVC valve in the added horizontal branch using a flat washer and a grommet (Dorman PN 42052) To try to keep an appearance as original as possible the draft tube will not be altered otherwise except to block its opening at the bottom with a 1 3/16" freeze plug (Dorman PN 555-086).
The '36 has no oil fill opening in the valve cover but it has 3 louvers in the valve cover that breathe in unfiltered air. I was planning to hide filter medium on the underside of those louvers if space allows.
Would you other guys doing this conversion be willing to share photos of your intended methods how it's going?
