RRE oil catch can install and PCV valve delete
Aug 9, 2006, 11:39 AM
#1
RRE oil catch can install and PCV valve delete
Ever since blowing my dipstick out (twice) at the track I've been looking to improve crankcase ventilation; my DIY air-tool inline-filter catch can wasn't working very well anymore because the heat had caused the filter to melt slightly and become very restrictive. I looked around for an oil catch can with two inlets (one for the PCV hose, one for the crankcase breather hose) and one outlet or breather filter and found this inexpensive solution from Road Race Engineering (RRE).
It has two inlets and a breather filter built into the top, and also an easy-to-open drain valve on the bottom.
It comes with an aluminum mounting bracket that I modified (hammered flat, folded and drilled) to look like this:
With a small or relocated battery and an aftermarket upper intercooler pipe, the catch can mounts neatly next to the engine, near the rear throttle cable bracket using existing bolts (the upper bolt for a wiring harness, the lower for the large throttle cable bracket).
As you can see the location is ideal because it minimizes the lengths of the two crankcase vent hoses. I capped the nipple on the turbo inlet tube where the crankcase breather hose used to go and capped the fitting on the intake manifold runner where the PCV hose goes. (Actually I hooked up my boost/MAP sensor hose to the latter fitting and deleted a tee I had on another hose.) I turned the PCV "elbow" fitting around 180 degrees (basically it's a friction fitting--just grab it and turn) and the PCV hose routing is just about perfect--a straight run to the catch can.
I also deleted the PCV valve by replacing it with a straight-through fitting. The PCV valve normally prevents the air in the intake manifold from pressurizing the crankcase, by closing under boost. However this means that the PCV hose can't help vent the crankcase under boost; since the PCV hose is no longer connected to the intake manifold, pressurizing the crankcase is not a problem anymore (in fact the PCV valve may never close) so the PCV valve can safely (in theory) be replaced with an open fitting that is less restrictive and less prone to jamming/clogging and should therefore improve crankcase ventilation.
The thread specification on the PCV valve is 1/8-27 NPT; the hoses I used were 5/16" oil/fuel line hoses.
It has two inlets and a breather filter built into the top, and also an easy-to-open drain valve on the bottom.
It comes with an aluminum mounting bracket that I modified (hammered flat, folded and drilled) to look like this:
With a small or relocated battery and an aftermarket upper intercooler pipe, the catch can mounts neatly next to the engine, near the rear throttle cable bracket using existing bolts (the upper bolt for a wiring harness, the lower for the large throttle cable bracket).
As you can see the location is ideal because it minimizes the lengths of the two crankcase vent hoses. I capped the nipple on the turbo inlet tube where the crankcase breather hose used to go and capped the fitting on the intake manifold runner where the PCV hose goes. (Actually I hooked up my boost/MAP sensor hose to the latter fitting and deleted a tee I had on another hose.) I turned the PCV "elbow" fitting around 180 degrees (basically it's a friction fitting--just grab it and turn) and the PCV hose routing is just about perfect--a straight run to the catch can.
I also deleted the PCV valve by replacing it with a straight-through fitting. The PCV valve normally prevents the air in the intake manifold from pressurizing the crankcase, by closing under boost. However this means that the PCV hose can't help vent the crankcase under boost; since the PCV hose is no longer connected to the intake manifold, pressurizing the crankcase is not a problem anymore (in fact the PCV valve may never close) so the PCV valve can safely (in theory) be replaced with an open fitting that is less restrictive and less prone to jamming/clogging and should therefore improve crankcase ventilation.
The thread specification on the PCV valve is 1/8-27 NPT; the hoses I used were 5/16" oil/fuel line hoses.
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