Toymods Car Club Inc: Tech & Conversions => Blowby and 4AGE compression

Toymods Car Club
www.toymods.org.au

Toymods » Tech & Conversions » Blowby and 4AGE compression Show: Today's Posts :: Show Polls Email to friend

Author

Topic

thechuckster
Forums Junkie

Location:
Brisbane
Registered:
February 2003

Re: Blowby and 4AGE compression	Fri, 23 January 2004 00:08

sorry if this is wordy, and if you know all this please ignore... pcv valves should only open up when there's high vacuum in the intake manifold - constant vacuum in the crankcase suggests that the valve is stuck open or has been removed from line. an old-style crank ventilation system needs two pipes -one sees atmosphere (usually from inside the air filter) and feeds air into the case unless there's excessive blowby, where it will then vent it into air cleaner - second extracts air from the case only via the manifold (after the TB), and only when there's high vacuum (cruisin or deccel). valve is matched to the air-flow and operating vacuum of the motor you really need these two (or similar) working otherwise the crase will be: -in vacuum (if the atmo pipe is closed off) unless engine is being boosted or accelled hard - where the case will be pressuring when the motor is under greatest stress -in pressure (if the vacuum is not working) then the seals/gaskets will fail plus rings will have excess oil around them during combustion so there might be eventual carbon/crap buildup in ring lands. a standard motor at idle should let you place a light card over the oil filler hole and it should alternate between blowing the card off the hole and then sucking it down. that;s what you have to aim for in setting up any vent system. [Report message to a moderator]

Current Time: Sun Jan 19 08:14:39 UTC 2025

Total time taken to generate the page: 0.011031866073608 seconds

.:: Contact :: Home ::.