[Healeys] Closed system- little confused

[Steve Gerow]

Respectfully, my closed system has worked fine with a stock filler neck and
stock 7lb Moss brass rivet cap since 2005.



When the engine cools down it sucks the overflow back into the radiator,
where the coolant level stays constant about < below the filler neck.

See the first 3 pictures at:

http://www.pbase.com/stevegerow/healey_tech



I put a 1/16 rubber gasket inside the cap and run the outlet tube to the
bottom of a vented reservoir.



Currently Im using a brass MGB overflow tank by leaving the  pressure cap
on it in the loosened position.



>>>>>>>>>QUOTED>>>>>>>>>>>>>>>>>>>

From: "Eric (Rick) Wilkins" <e-wilkins at cox.net
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Subject: Re: [Healeys] Closed system- little confused
Cc: <healeys at autox.team.net
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To make the system work, you need either a longer radiator neck, or a
longer radiator cap to fit your stock radiator. All new radiator caps
that you find at the stores have two way release valves. Hot pressure
allows overflow to go to the tank. When cooling, the vacuum will suck
the coolant back into the radiator. Don't ad any gaskets. that may
defeat this operation.

Leak in the overflow hose/tank will not allow the coolant to suck back
into the engine, unless you make the return hose go to the bottom of
the overflow tank.

I've got a closed system in my 100 Six- http://ewilkins.com/wilko/engine.htm

  - the overflow tank has the return pipe on the bottom of the tank.





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Steve Gerow

Pasadena, CA, USA

BN6