Richard Mayor
BN7L-466 Vintage Racer
Portland, Oregon
From: mayorrichard@hotmail.com
To: bspidell@comcast.net; richard.ewald@gmail.com
CC: healeys@autox.team.net
Subject: RE: [Healeys] PCV needs fresh air too
Date: Fri, 3 Feb 2012 01:47:16 +0000
Bob, I beg to differ with you. The hose from the "tee" on top of the valve
cover that goes to the air filter is not a fresh air source. You have got the
flow of air going in the wrong direction. Blowby (past the piston rings) into
the crankcase, that also blows up into the valve cover, is forced out of the
hose that goes to the air cleaner - which then gets sucked into the carburetor
and then into the combustion chamber.
In my opinion, trying to put a PCV valve into the system is a waste of time.
A better solution (for left hand drive cars ) is to put a catch tank on the
right side of the engine bay and run one hose from the crankcase vent and
another hose from the valve cover "tee" into the catch tank. Eliminating the
hot gasses that vent into the air filter will result in much cooler air
getting into the rear cylinders and the engine will make more power. Isn't
that what we really want to do with our Healeys - make then perform better?
Richard Mayor
BN7L-466 Vintage Racer
Portland, Oregon
> Date: Wed, 1 Feb 2012 18:06:33 -0800
> From: bspidell@comcast.net
> To: richard.ewald@gmail.com
> CC: healeys@autox.team.net
> Subject: Re: [Healeys] PCV needs fresh air too
>
> The pipe from the air filter to the valve cover is the fresh air source. I
doubt there is an oil/air separator under
> the valve cover; a baffle maybe--like in a Healey valve cover--but I haven't
had the valve covers off.
>
> From:
>
> http://en.wikipedia.org/wiki/Crankcase_ventilation_system
>
> about halfway down: "It is an "open system" in that fresh exterior air is
continuously used to flush contaminants from
> the crankcase and into the combustion chamber."
>
> Or here:
>
> http://www.autoshop101.com/forms/h63.pdf
>
>
> Bob
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