Thread: Best blowby remedy

"dusted 300tdi "
In my case the engine in question was ex NSW forestries then ex farmer Joe
When I changed the air filter out it kinda sorta had an extra large breathing hole... even biogger than a K&N

So in that case yeah maintenance

S

Originally Posted by flagg

That said, make sure you install the ProVent high up in your engine bay, and use the check value if your oil drain is below the oil level in your block or you could suck oil up into your intake (as I think happened to Dougal, I'm sure he will chime in - (he isn't a fan of the ProVent for that reason ))

Yep. 8 litres of oil in 1500km was sucked out of the sump, fed to the engine and burnt. It came through in big enough quantities that the engine ran on oil numerous times and blew the 4BD1T head gasket. I think it has also stretched ring-lands and created an oil burning problem which I didn't have prior.

My biggest problem with the provent is the design flow is in the wrong direction. Clean air out must head through oil dripping from the filter before it can leave the housing. Instead of just filtering the droplets from the clean air, all oil returned to the engine must pass the filter.
The outlet is the lowest of the two connections, which means even more oil goes out the outlet and if oil is sucked up or the drain blocked that oil will head out to your intake in gulps.
The outlet chamber is a type that can fill with oil and not drain back into the housing. The only exit for this oil is out through your engine intake.

I have reversed the flow of mine and removed the internal valve to stop it sucking up oil. This also means only clean air to the intake is filtered. The vast majority of the blowby oil is seperated by the vortex and never gets to the filter. Greatly reducing it's load.
This places the outlet on the top connection, where it makes the most sense and cannot fill with oil. The inlet is now the lower connection where the chamber filling with oil is not a problem.

The results are now excellent. But functionally it is now nothing like the device I purchased and the layout doesn't fit nicely in my engine bay either. Long term it'll be scrapped and I'll make another seperator of my previous design but bigger.

Alternative products from other filter companies include the Envirogaurd from Fleetguard-Cummins and the Donaldson Spiracle.
It's worth nothing that both these products have the outlet high.