Crank case breather

[Mark D]

[Neville Bertwistle]

[Mark D]

[Gary P.]

[REXY]

[Neville Bertwistle]

[REXY]

[rattatattat]

[ozstang65]

PCV = Positive Crankcase Ventilation. If you remove the system then you're not flushing the crankcase with fresh air. Probably not a problem on a racecar but on a regularly used road car (apart from being illegal) you'd run the risk of early oil contamination.

Airflow typically is: Filtered(carby) side of air filter-hose-Rocker cover cap-crankcase-oil separator-pcv-hose-inlet manifold-combustion-exhaust

The PCV valve limits airflow and provides a means of sealing the line in case of a backfire.

Most races mandate a catch tank if you're not using pcv

[rattatattat]

I know how the system is supposed to operate, but the lynx intake manifold I have has no provision for PCV. It only has one barb on it for the brake booster and that only sucks into two of the runners because it's a crossover manifold. When running a PCV line into the intake manifold, the blow-by needs to be distributed across all four runners. That's not possible with most of the manifolds that use side draft webers.

My car is a weekend car only, so early oil contamination doesn't worry me. It's just the smell of the crankcase that bothers me. After doing a bit more research I think a catch can would help reduce the smell because it condenses the oil vapours.

[ozstang65]

It may help a bit, try venting the tank as low as possible and seal up your firewall as good as you can. Run your rocker breather to the tank as well.

[rattatattat]

Thanks Ozstang

[rattatattat]

[ozstang65]

Yeah, you could be right. I'd be hooking it up anyway, even if it were only to get rid of the smell.

[rattatattat]

Yeah, if only I could hook it up. Ah well, oil catch can will have to do