I have no idea, but.. I just had to do a valve job on my '89 Isuzu
Amigo. All four exhaust valves were badly burnt. ( they looked square.)
no compression at all. And ... when I removed the oil filler cap, the
motor would die. Serious suction in the crank case. It tried to eat the
rag I was holding the oil filler cap with.
Once I did the valve job, all is normal. The motor runs fine with or
with out the oil filler cap.
I have no idea why?? I'd love to know.
> ----------
> From: Wm. Severin Thompson[SMTP:wsthompson@thicko.com]
> Reply To: Wm. Severin Thompson
> Sent: Wednesday, November 04, 1998 8:31 PM
> To: spridgets@Autox.Team.Net
> Subject: Re: PCV function
>
> OK my fellow Spridgeteers.... a related question (non LBC)...
>
> I've got a '67 Volvo Amazon Estate wagon. The B18 motor was a bit
> tired, I
> had a 30k fuel injected motor out of a Sportwagon... (tree fell on
> it... my
> car, my tree).
>
> So, I dropped in the fuelie motor, plugged the injector inlets (the
> trick is
> to use freeze plugs with Permatex), bolted up the old intake with the
> Weber
> 32/36. I'm positive I have no vacum leaks.
>
> There's supposed to be a breather hose from the oil filler cap on the
> valve
> cover, that goes to a little breather in the K&N filter on the Weber.
>
> Problem is there's so much vacum present at the breather hose in the
> valve
> cover, that the car won't run worth a shit with the hose attached to
> the
> carb/filter. It's like a ShopVac! Why would there be so much vacum at
> the
> valve cover?
>
> WST
> -----Original Message-----
> From: Rick Kaplan <rkaplan@us.net>
> To: CONAN@RALVM8.VNET.IBM.COM <CONAN@RALVM8.VNET.IBM.COM>;
> spridgets@Autox.Team.Net <spridgets@Autox.Team.Net>
> Date: Wednesday, November 04, 1998 9:14 PM
> Subject: Re: PCV function
>
>
> >
> >-----Original Message-----
> >From: CONAN@RALVM8.VNET.IBM.COM <CONAN@RALVM8.VNET.IBM.COM>
> >To: spridgets@autox.team.net <spridgets@autox.team.net>
> >Date: Wednesday, November 04, 1998 9:23 PM
> >Subject: PCV function
> >
> >
> >>...silly questions... MY turn! MY turn!!
> >>
> >> Could someone please explain to me just what the function of the
> >PCV -valve-
> >>is? Why is a 'valve' needed?
> >> I understand that the purpose is to pull crankcase vapors back
> thru the
> >>intake to be burned with the fuel charge; but, why do we need this
> valve?
> >>Why not just an open hose from the crankcase vent to the air
> cleaner?
> >> Thanks!
> >> Ed in NC :-)
> >>
> >
> >You need the valve to restrict PCV during periods of high manifold
> vacuum,
> >to increase PCV during high rev (low manifold vacuum) and to cut off
> PCV
> >during backfire.
> >
> >Rick Kaplan
> >
> >
>
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