Why don't OPE V-Twin engines use an automotive PCV valve setup?

[SOHCman]

I maintain two OPE v-twin engines, both with a one way flap type valve that feeds to the intake via a single hose from only one valve cover.

Why wouldn't you want a automotive style PCV valve in its place along with the second hose that would pull vapors from one valve cover, down through the engine, and out the PCV valve in the opposite valve cover, to the intake.

Hypothesis: An automotive PCV would help keep the crankcase and oil cleaner by removing deposit forming vapor, and also maintain a superior negative crankcase vacuum to the one way flap valve method.

I'm sure I am missing something obvious, thank you.

 

[Rand]

They went with the cheapest simplest solution that worked?

 

[Coltfanboy]

Maybe the impulse line for the fuel pump woundn't work correctly ?

 

[SOHCman]

They went with the cheapest simplest solution that worked?

I fear you may be correct despite these engines being 3K+ to replace. I have had one fail before which blew out a crankshaft seal and shot hot oil on a hot muffler, so maybe the concept of "works" or "worked" is a more complex matter in some cases.

 

[SOHCman]

Maybe the impulse line for the fuel pump woundn't work correctly ?

Good point, I admit I don't know if it would be an issue or not. One of these engines uses an impulse fuel pump, but the other is fuel injected and has nothing running off impulse... (Make it so! )

 

[dvblanch]

Possibly just not enough vacuum in the intake on the small engines

 

[repairman54]

Possibly just not enough vacuum in the intake on the small engines

2x especially with throttle open more to maintain engine power levels.