[DeTomaso] vacuum pump
Forest Goodhart
forestg at att.net
Sun Feb 3 21:04:47 EST 2013
There is not enough vacuum in the air cleaner to operate a pcv valve. The whole
object is to remove the blow-by from the crankcase and burn it in the engine. If
you don't do this you might as well just use breathers on the valve covers but
you will get smoking due to blow-by. Prior to PCV systems they used a road draft
tube that exited into the air flow beneath the car. This created a vacuum to
purge the crankcase but did it into the atmosphere adding to air pollution.
________________________________
From: Justin Greisberg <justingreisberg at hotmail.com>
To: guson at home.se
Cc: detomaso at poca.com
Sent: Sun, February 3, 2013 5:51:49 PM
Subject: Re: [DeTomaso] vacuum pump
that's a great idea that I didn't think of. My fancy billet oval air cleaner
does not have a vacuum fitting on it but it makes sense to run the PCV off the
air filter. that would seem to eliminate any concerns for vacuum problems off
the throttle body. not sure if i should run the brakes off the air cleaner as
well or throttle body, or electric pump...
From: guson at home.se
To: justingreisberg at hotmail.com
CC: detomaso at poca.com
Subject: Re: [DeTomaso] vacuum pump
Date: Sun, 3 Feb 2013 14:01:48 -0800
Justin,
PCV vacuum and booster vacuum are fundamentally very different. For braking you
need a little flow when you apply the brakes but then no continous flow.
Electric pump would work with that. PCV requires constant flow which I think an
electric pump is not suited for. My suggestion is to run the breather hoses to
the air filter and skip the vacuum part entirely.
Tomas
<-----Ursprungligt Meddelande----->
From: Justin Greisberg [justingreisberg at hotmail.com]
Sent: 3/2/2013 10:42:00 PM
To: detomaso at poca.com
Subject: [DeTomaso] vacuum pump
i am running fuel injection and am thinking about eliminating the vacuum take
off from the throttle body for PCV and brake booster. Does anyone know of a
quiet electric pump to supply continuous vacuum for both (not intermittent for
booster only), or does anyone have any experience with an engine driven pump for
this? justin
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