Stalled when oil filler cap off.

[rob hod]

    The engine breather system. All cars have need crankcase breathing, even
if (as on older cars) its just a vent to the atmosphere. On most cars
produced in the last 30 yrs or so there is 'positive' breathing. This
usually involves running a vent from the crankcase and/or the rocker cover
to the vacuum side of the engine, via an orifice, flame trap, restrictor or
regulator so that under suitable conditions a vacuum is applied to the
crankcase environment. The aim is to prevent the build up of crankcase
pressure from piston/valve blowby and minimise the risk of oil seepage under
pressure through seals and to minimise emissions of harmful combustion
by-products , by recycling them through the engine.

HTH


rob
----- Original Message ----- >
> --__--__--
>
> Message: 18
> Date: Fri, 05 Apr 2002 13:41:47 -0500
> From: Douglas Frank <frank at zk3.dec.com>
> Organization: Center for Post-Apocalyptic Computing
> To: "quattro at audifans.com" <quattro at audifans.com>
> Subject: Re: Stalled when oil filler cap off.
>
> I'm a little confused.  OK, more than a little.
>
> The oil filler communicates with the top of the head, not the intake.
> What's to suck vacuum there?
> --
> Douglas Frank    Compaq Computer Corp.
> ZKO              110 Spit Brook Rd.       The older I get,
> 603-884-0501     Nashua, NH USA 03062       the better I was.
>
> --__--__--
>