Kohler Command twin CH18, Breather question

[skeer]

So long story short, is the crankcase breather on a small engine basically the same as a pcv on a vehicle engine?

Longer version, So after doing some carb work on my CC 3184 recently I decided to fashion a carb space out of a solid block of 3/4" thick ptfe. The 500* melting point is more than sufficient to withstand the block heat I'd say. Anyway, now the little breather tube is too short so I wanted to find out what it actually does. Like does it help with fuel delivery by more-or-less providing some vacuum or if not does it work how positive crankcase ventilation does?

 

[The Cobbler]

I'm sure It's just a vent, no valve or anything . any fuel/oil resistant tube will work for you

 

[ToolsRCool]

So long story short, is the crankcase breather on a small engine basically the same as a pcv on a vehicle engine?

Longer version, So after doing some carb work on my CC 3184 recently I decided to fashion a carb space out of a solid block of 3/4" thick ptfe. The 500* melting point is more than sufficient to withstand the block heat I'd say. Anyway, now the little breather tube is too short so I wanted to find out what it actually does. Like does it help with fuel delivery by more-or-less providing some vacuum or if not does it work how positive crankcase ventilation does?

The tube simply links to the air filter duct or tract of the crankcase fumes to be vented and go through combustion. On the CH18, the PCV system is a reed valve. Design is to allow any pressure to escape, and actually have the crankcase run at a slight vacuum to help prevent leaks, better ring control, etc.....

Air cooled engines do run a lot hotter than liquid cooled engines though. Over 300F is normal for them, 350F, etc..... Important to keep all cooling fins clean, and all air routing tins on the engine, just as an FYI. The Kohler PCV tube seems to be of normal rubber material, I have seen some melted in overheated engines, but the hottest portion is the cylinder heads and exhaust, so if you can keep it away from there you should be OK

 

[skeer]

Niiice, great info thanks! I'll figure out a way to route a longer hose back into the intake then.