2001 325xi, 250,000km and the CCV is on it's way out. Rather than replace with the same part and plastic hoses that crack periodically (I do plan to keep this car for at least another 100,000km), would rather find a more permanent solution. I live in Toronto so cold weather is an issue.
These are the goals:
Ideal solution would be a dry sump system. Highly impractical due to cost, won't bother entertaining the idea.
Looking at the early E90 CCV, it appears to be heated. Looks to be a practical solution, though mounting and routing hoses would be an issue. Assuming it's just a simple heater element like the thermostat, shouldn't be too hard to wire it up to turn on before engine start up, and for about 2 minutes after engine shutdown. Also, this unit is supposed to regulate around 9-12 inches of water for crankcase vacuum, whereas stock M54 is supposed to be 4-6, unknown if this will be an issue.
Mann-Hummel ProVent looks promising. Has a built in pressure regulating valve, same issue as the early E90 CCV. Drain keeps it an OEM-like system. Downside is that it does not address cold weather concerns. Concern regarding crankcase vacuum may be an issue
Racor CCV appears to be the best option. Filters like the Mann-Hummel ProVent. Pressure regulating valve with an indicator for clogged filter/bypassing like the E90. Drain port for draining to dipstick. Best of all is the heating option, thermostatically controlled, should make it easiest to wire. Concerns are mounting and hoses. Price is an issue with the unit costing $300 without the heater.
Pressure regulating valve harvested from a CCV with a catch can is a possibility. Does not solve the cold weather issue, and most don't drain back to the dipstick. Price is an issue due to requiring a new CCV to harvest for the valve. If an alternate valve was available this would be viable.
Another option from reading on the Audi S4 V8 is that the CCV lines are heated. There is a VW part available that sits between CCV lines and heats the vapors. OEM CCV unit + rubber PCV lines + VW CCV heater + oil drain check valve could be a winning combination. Again, wiring may be an issue, but at least the valve will fit without problem, and lines will not be that much an issue. Cost won't be too bad with the valve costing around $40 on RockAuto for the cold climate version.
Any input would be great. I think I'll be going with the last option to try out. It's the cheapest so there's less to lose. Worst case scenario with this is I have an original functioning CCV.
These are the goals:
- suitable for cold weather
- regulates crankcase vacuum like the original CCV
- won't fail like the original CCV
- longer part lifespan
Ideal solution would be a dry sump system. Highly impractical due to cost, won't bother entertaining the idea.
Looking at the early E90 CCV, it appears to be heated. Looks to be a practical solution, though mounting and routing hoses would be an issue. Assuming it's just a simple heater element like the thermostat, shouldn't be too hard to wire it up to turn on before engine start up, and for about 2 minutes after engine shutdown. Also, this unit is supposed to regulate around 9-12 inches of water for crankcase vacuum, whereas stock M54 is supposed to be 4-6, unknown if this will be an issue.
Mann-Hummel ProVent looks promising. Has a built in pressure regulating valve, same issue as the early E90 CCV. Drain keeps it an OEM-like system. Downside is that it does not address cold weather concerns. Concern regarding crankcase vacuum may be an issue
Racor CCV appears to be the best option. Filters like the Mann-Hummel ProVent. Pressure regulating valve with an indicator for clogged filter/bypassing like the E90. Drain port for draining to dipstick. Best of all is the heating option, thermostatically controlled, should make it easiest to wire. Concerns are mounting and hoses. Price is an issue with the unit costing $300 without the heater.
Pressure regulating valve harvested from a CCV with a catch can is a possibility. Does not solve the cold weather issue, and most don't drain back to the dipstick. Price is an issue due to requiring a new CCV to harvest for the valve. If an alternate valve was available this would be viable.
Another option from reading on the Audi S4 V8 is that the CCV lines are heated. There is a VW part available that sits between CCV lines and heats the vapors. OEM CCV unit + rubber PCV lines + VW CCV heater + oil drain check valve could be a winning combination. Again, wiring may be an issue, but at least the valve will fit without problem, and lines will not be that much an issue. Cost won't be too bad with the valve costing around $40 on RockAuto for the cold climate version.
Any input would be great. I think I'll be going with the last option to try out. It's the cheapest so there's less to lose. Worst case scenario with this is I have an original functioning CCV.
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