Thread: RXP-X Crank Case Vent Tube
04-10-2009, 03:19 PM #1
RXP-X Crank Case Vent Tube Question
When installing the 4 Kanoflex intake some guys are running the crank case vent tube to a catch can and then calling it a day.
In stock form the vent tube is routed into the air intake to the supercharger.
Les Cooke at Seadoo Centre sells a performance 4 Intake Filter Coupler that also has a fitting for the cc vent tube.
Is one vent tube application better than the other?
If so, can someone explain their thoughts on why?
Last edited by Water Pig; 04-10-2009 at 05:27 PM. Reason: Catch Can Question
04-10-2009, 04:18 PM #2
From what I've read there isn't much need to run the line back into the intake unless you ride in the ocean. In that case the oil can help lube the charger. Then again, I never found any substantial trace of oil in my stock intake, so not sure how much oil even comes out on a stockish motor.
04-10-2009, 06:10 PM #3
I found a trace of oil film on the hose coming from the supercharger but just barely enough to discolor a rag.
04-10-2009, 06:34 PM #4
Catch Can or Not
That makes sense. Especially since Australia is surrounded by salt water.
Has anyone ever examined/tested crank case pressure/horsepower issues.
I'm told that the intake draw may assist more in bringing the cc pressure down and therefore not rob your machine of any potential horsepower.
Does that make any sense?
04-10-2009, 06:37 PM #5
It makes sense to me. Why else would they install it? It also reduces pumping losses since the engine actually acts like a big air pump and the pressure in the cc costs power.
04-10-2009, 07:24 PM #6
04-11-2009, 10:33 PM #7
- Join Date
- Nov 2006
- Delray Beach, Florida
Crankcase blow by is spent gas void of oxygen. When you put it back into the fresh air intake, you are contaminating the charge. OEM has to do it that way to be environmentally friendly. IE: if you over fill your oil, and it blows out the catch can vent, it will end up in the lake. OEM style makes you burn it off rather than polute. The HP benefit of venting to a catch can is always better than the HP benefit of the minute amount of crankcase pressure you will relieve, and in a 4 inch inlet tube, there is very little pressure differential.. if there was a substantial pressure drop, then it would be beneficial to go 5 inch !!! That is just from my personal experience.
04-12-2009, 01:34 PM #8
Catch Can or Not
Thanks for your comments.
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