Hi All,
Does anyone use a catch can for the crankcase gasses?
Anyone have any comments on there use?
Ta
Paul.
Hi All,
Does anyone use a catch can for the crankcase gasses?
Anyone have any comments on there use?
Ta
Paul.
It is beneficial to allow crankcase gasses (oil) to enter the engine as it provides lubrication.
Simon
??? via the intake ??? , oil in the intake mix increases the likelyhood of detonation, you want clean air in there, not air and oil.
Theres plenty of oil in the engine anyway lol.
I use one on my car mate, but cant comment on their use on volvos.
Ross
All fast cars long gone. Sensible family BMW 3 series now.
Still Volvo links though as my wife has a V50 R design sport and a mildly fettled T4
Its been a common practice on 4 stroke engines for many years to draw crankcase vapours into the inlet to provide upper cylinder lubrication, honest!
Simon
True, most cars have the breather set up that way, however, when tuning and upping the power, you stick a catch can in as the chance of oil breathing becoming excessive increases due to too much crank case pressure. The level of boost pressure at which you should do it is widely disagreed upon lol.
Ross
All fast cars long gone. Sensible family BMW 3 series now.
Still Volvo links though as my wife has a V50 R design sport and a mildly fettled T4
On my 850 T5 the breather pipe connects to the inlet pipe just before it connects to the turbo inlet. There is a vacume operated valve there which partly closes the breather pipe during boost conditions to stop excessive amounts of oil being consumed as the crankcase pressure will be high.
I've heard from people who have disconnected the breather systems on cars that excessive amounts of condensation develop in the crankcase which when mixed with the oil produces a white sludge.
The combination of blow by gasses getting past the piston rings and sucking from the inlet creates a circulation of air through the crankcase to prevent condensation/sludge.
Simon
You can create a sucking effect without having it connected to the inlet if such problems arise. These catch tanks wouldn't be present on many many big power tuned cars if they didnt work. They remove contaminants, oil vapour, from the inlet, so that it is just air, and fuel.
If the sucking force is necessary you can use the exhaust to draw the gases out.
Ross
All fast cars long gone. Sensible family BMW 3 series now.
Still Volvo links though as my wife has a V50 R design sport and a mildly fettled T4
i run a different breather,that removes the vac feed to the inlet pipe,and means i don't feed hot oil through the compressor side of my turbo lol.The thing you describe as a valve in the inlet tract actually heats the crank case gases to stop the oil condensing,it gets surprisingly hot,my intake does'nt have one
Catch tanks where originaly supposed to be used in competition cars, to stop oil being dropped on the track if the engine goes tits up during the race. Oil could be past into the inlet manifold through the breather and onto the track, hence the catch tank to 'Catch' any oil coming through the breather pipe.
I've not heard of any gains to be had from fitting them, only passing scrutineering before a race.
http://www.airbrushartists.org/Gal72..._s_Gallery.asp
Currently rocking Volvo's finest V70R 2WD Manual
Previous cars:
1996 855 T5 (Ex Police),1996 854 T5,1996 855 T5,1995 855 Black T-5R,1996 960,1997 855 R
I had one on my rs turbo cos the throttle housing was getting a lot of oil coming through that affected the idle speed when it clogged up the hole, worked a treat on that. Don't know of any other reason to have one, unless they look shiny!
White '98 S70 T5 ME7
K&N panel filter
Drilled airbox
Ported 18T
Milltek Exhaust
Dark Anthracite Comets
'R' Bumper
2003 C70 Headlights
Autogauge smoked boost gauge
"Yeh, the T5 and T5R are handy bits of kit for transporting wardrobes across the country at monumental speeds."
basically stops oil going into the intake again if the car breathes any, due to crank case pressure arising from increased boost.
Ross
All fast cars long gone. Sensible family BMW 3 series now.
Still Volvo links though as my wife has a V50 R design sport and a mildly fettled T4
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