How does a backfire in the header ignite fumes in the crankcase? They are not
connected.
Gary Hodson
-----Original Message-----
From: Bob Spidell <bspidell@comcast.net>
To: Ed O'Neal <ed@wadsworth-eng.com>
Cc: healeys <healeys@autox.team.net>
Sent: Fri, Feb 3, 2012 8:26 am
Subject: Re: [Healeys] PCV valve
A backfire in the header could cause the crankcase fumes to ignite.
PCV valves prevent this (from this site:
http://autorepair.about.com/library/a/1h/bl616h.htm):
"*In case of a backfire in the intake manifold*: the valve closes, stopping
the
ack flow and preventing ignition of
umes in the crankcase."
ob
On 2/3/2012 5:12 AM, Ed O'Neal wrote:
I'll step into this discussion. An old racing tip. Weld a small tube
(3/8"-1/2") into one of the exhaust header pipes inclined 45 deg to the
exhaust flow. The other end of the tube is connected )via some route) to
the
crankcase cavity. The connection at the exhaust hearer will act as a
venture,
drawing blowby gases from the crankcase, achieving a slight negative
pressure
therein and reducing oil leaks.
Any thoughts?
Red Flash
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