Neil:
If you are really planning to race the car, you will need as
much crankcase ventilation as possible. The typical set up for racing
is to use a sealed oil filler cap. That way you do not blow oil over
the top of the engine and cause the tech guys conniption (sp) fits. You
can use the stock rocker cover with the breather tube towards the rear.
Cut off the tip of the breather tube that has the restrictor orifice in
it. The tappet cover breather is restrictive. It can do with being
enlarged and the mesh/filter removed or re-evaluated. Huffaker
suggested a 2 inch vent pipe off the front tappet cover, with a drain
back tube to the sump! Connect both vents to a suitable catch tank
which is then vented to atmosphere. (An aluminium fuel container as
used by back packers makes a really spiffy catch can).
My B has the Huffaker set up with the drain tube to a deep
baffled sump. It makes removing the engine a real bitch and I do not
recommend it.
Kelvin.
-----Original Message-----
From: Neil Cotty [mailto:neilc@tradesrv.com.au]
Sent: Tuesday, November 10, 1998 10:05 PM
To: MG Mailing List (E-mail)
Subject: Smog Gear
Hi all,
As some of you know I have a 1970 BGT ex USA - California to be exact
that
I'm preparing for the track.
My 1970 Engine is a J spec so it *had* the air pump and the air
injection
manifold. My mechanic years ago ditched these (as I live in Australia
and my
1970 car does not require them) by eliminating the air pump and plugging
the
holes in the head (and the one in the intake manifold). But I still have
the
Crankcase/Caburettor ventilation system and the Absorbtion cannister
(Evaporative loss control) still in place. I realise that there is a
line to
it from the Fuel Tank to a Vapor Separator installed in the three qtr
panel
(sorry if thats not the right name) inside the GT's trunk.
I realise I will need to fit the older style 'breathing' Oil filler cap
when
this is done to allow ventilation, but can I safely remove the Vapor
Separator (block it off at the tank??) and the absorbtion cannister?
Should
I plug the constrictor on the Rocker cover and the one on the crankcase
(what can I use to plug these constrictors?) which goes to the
absorbtion
cannister and fit say an older style, open tube type valve tappet cover
(I
hope I've read this right!) ?
Am I lost? <G> Confused? I am. The 1970 model appears to be the most
weird
of emission systems with the least documentation. I have all the Haynes,
Bentley books etc but would like some advice from someone who's actually
performed this operation.
I'm intending to replace the Carbs and std Intake manifold with a pair
of
HS6's for racing so I'd like to ditch all these emission goodies before
hand. I also like learning what these items do before I just disassemble
them. Quite interesting stuff. :)
Thanks,
Neil.
--
Neil Cotty - Sydney, Australia
1970 MG B GT / 1959 MG A 1600 Mk1
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