Alternative Oil Breathers

[GV]

Since swapping to Carbs from Efi the pipe used for the oild breather is no longer required. The new one from the air filter has a kink in it defeating the obect of passing air into the rocker cover - is there an alterntive. I've seen a baffle type knocking around. What would happen if I left the breather pipe off I wonder?

[rev-erend]

I think you could have the oil breather from the rocker cover go into a catch bottle but don't block it up otherwise the engine will suffer pumping losses and possible pressurise the engine causing oil leaks.

[adam quantrill]

The input of breather 'air' into the inlet puts the crankcase under negative pressure (w.r.t. atmospheric) which tends to keep the oil inside.

When you start getting blowby (e.g. the piston rings getting a bit worn, or cracked) the pressure will rise, and you need all the scavenging you can get, or the oil will seep out of every available seal.

So my advice is to get the oil breather venting into the carb inlet, preferably under vacuum...

[GV]

adam quantrill said:

The input of breather 'air' into the inlet puts the crankcase under negative pressure (w.r.t. atmospheric) which tends to keep the oil inside.

When you start getting blowby (e.g. the piston rings getting a bit worn, or cracked) the pressure will rise, and you need all the scavenging you can get, or the oil will seep out of every available seal.

So my advice is to get the oil breather venting into the carb inlet, preferably under vacuum...

Adam - do you still have the SE Dash for sale?