Let me tell you what I got,,,,
71, that leaks inside the drivers side motor mount.
I'm wondering if the following will stop it. It only happens when I stand on
it anyway.
The venting that I have is from the valve cover to a Tee, one goes to the
carbon canister the other goes to the Stromberg.
The one to the Stromberg has a kink cause I tried to take a piece of heater
hose to make the run. It's too short, so I get a kink.
I don't really use the canister cause the plastic tube from the gas tank
caught fire when I was welding in the new floor pieces.
After Joe reminded me to read the other messages I got to thinking, why not
do away with the line to the carb and dump ALL of it to a New catch type jug
where the carbon thingy sits.
Concourse, list with deductions, I don't care about that stuff !
Comments ??
-----Original Message-----
From: Trevor Boicey [mailto:tboicey@brit.ca]
Sent: Friday, March 30, 2001 6:33 PM
To: Joe Curry
Cc: Larry Elswick; Spitfires mailing list
Subject: Re: 1500 Venting
Joe Curry wrote:
> > All this talk about crankcase pressure
> > relief has me wondering. I just finished
> > a rebuild and added an electric fuel pump.
> > I also added the vent pipe from the fuel
> > pump opening. I still have the vent hose
> > from the valve cover running into the HS-4's
> > like a stock configuration. Should I do away with
> > these vent hoses? Thanks!
>
> Unless you see oil venting into the carbs it probably won't heur
> to leave it as is.
I wouldn't leave it as is, because technically
that creates a "short circuit", an air leak for
the intake system via the block.
The vacuum in the HS-4s is supposed to suck any
excess crankcase pressure from the block, so there
is always a little vacuum on it and a bit of air
flow through the hose.
However, the block should be sealed, so the only
air it sucks in is blowby from the rings. There really
isn't a lot of flow in the pipe.
If you also have an open air vent from the block
at the fuel pump cover, then air is free to enter
and leave the block at will.
So the vacuum on the carb might suck air
constantly in the vent, through the crankcase, through
the head, through the valve cover, and into the carbs. ie: an
air leak that might show up as being a bit hard to tune out,
because you'd need to richen up to get a decent mix at
idle.
I don't understand why the 1500 needs a crankcase
vent, the existing system works great, doesn't vent
your oily gunk into the air, costs you no
horsepower, doesn't have a catch tank you have
to empty, won't drip oil on your driveway, and so
on.
Not much to improve on really, why change it? Leave
the vent hose system in place.
--
Trevor Boicey, P. Eng.
Ottawa, Canada, tboicey@brit.ca
ICQ #17432933 http://www.brit.ca/~tboicey/
"200 channels, and nothing but cats." - Jasper
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