Table of Contents
HOSES
by Tim Palmer
I recently had to replace several PCV hose on my Rampside. I noticed some existing hoses I had put on were not the proper size. I then decided that it was time for me to do some research and find out what the proper sizes are so I could keep a stock of the hose sizes I actually use. The table below is the results. It may or may not be complete. If you have any addition or corrections please let me know.
I did discover two rules of thumb. PCV and vacuum hoses are 1/32“ smaller than the outside diameter of the barb the fit on. With a few exceptions the PCV and vacuum hoses do not use clamps. If the proper size is used I have found they fit very well. For fuel hoses the hose's size is the same as the outside diameter of the steel line and always have clamps.
CORVAIR HOSES
| TYPE HOSE | SIZE | APPLICATIONS |
|---|---|---|
| VACUUM | 5/32” | Distributor to carb. Carburetor to choke pull off. Balance tube to PG modulator. |
| VACUUM | 7/32“ | Turbo choke tube to carb. choke. |
| VACUUM | 9/32” | 61-63 and 64-65 w/CAC, PCV tube to air cleaner. |
| VACUUM | 11/32“ | 61-63 and 64-65 w/CAC, Balance tube to PCV valve. 64 exc/ CAC, Balance tube to PCV orfice. |
| VACUUM | 15/32” | 61-63 and 64-65 w/CAC, PCV valve to tube. Balance tube to head. |
| FUEL | 1/2“ | Filler vent. |
| FUEL | 5/16” | Fuel tank to main line. Main line to engine line. |
| FUEL | 1-3/8“ | Filler tube. |
| DUCT | 2” | Defroster (w/gas), Box to defroster outlet. |
| DUCT | 2-1/2“ | Defroster (w/air), Box to defroster outlet. |
| DUCT | 3” | Warm air (61-64), Engine to heater fan. |
| DUCT | 4“ | Heater, Engine to heater fan box. |
| INTAKE MANIFOLD | 2-1/8” | Intake manifold, Turbo to crossover tube. |
| OIL | 5/8“ | Turbo oil drain to passenger side head. |
| WINDSHIELD WASHER | 5/32” | All Washer pump to nozzle. FC bottle to washer pump. |
| WINDSHIELD WASHER | 7/32“ | All except FC. Tank to washer pump. |
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