Crankcase ventilation on a metro turbo
Turbo Mini Forums

Can I do away with the pipe work from the crankcase breather/ seperators to the one way valve on the manifold? Do the fumes need to be vented into the manifold or can I remove these and just vent them to the air filter box?

Patina=old and knackered and won't clean up

You can't do away with the breathers, you can do a catch tank setup or just attach small filters to the ends of the breathers to catch the fumes. Some people just pipe it under the car. Alan

Edited by nala56 on 8th Jul, 2013.

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Vent them to air via a catch

Edited by Brett on 8th Jul, 2013.

Yes i moved to the darkside

Instagram @jdm_brett

I wasn't going to do away with them just wondered why they go to the manifold? what advantage is it feeding the fumes back into the manifold? I was going to block the one to the manifold and feed it back to the metro air box where half of it goes anywat

Patina=old and knackered and won't clean up

I think the feed back into the manifold is mainly a factory emissions type thing, i.e recirculating the oil vapour instead of allowing it out into the atmosphere un filtered.

Personally I would favour a catch tank as recirculating oil vapour into the fuelling system can't be best for power.
You could also run all the breather into the rocker cover and fit a breather filter onto the rocker cover itself.

The vacuum of the engine also helps the breathers do their job. As above, this isn't great for power.

Edited by theoneeyedlizard on 9th Jul, 2013.

In the 13's at last!.. Just