If you bought your cap from Moss it is a long cap that reaches the
bottom of your radiator neck. No conflict there.
One scenario that "works" as a coolant recovery system is to use any
old cap. You'll get overflow into your overflow tank, and it will
recover coolant by vacuum, but it won't really be a closed system in
that the pressure is not built up so the boiling point is the same ol'
212 degrees. In order for the pressure benefit to work, you need the
right cap/neck fit (this can be accomplished with spacer gaskets).
On Jul 29, 2010, at 4:03 PM, Steve Gerow wrote:
> 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@cox.net
> <http://mbox.abrazosdata.com/compose.php?to=e-wilkins@cox.net> >
> Subject: Re: [Healeys] Closed system- little confused
> Cc: <healeys@autox.team.net
> <http://mbox.abrazosdata.com/compose.php?to=healeys@autox.team.net> >
> Message-ID: <EA049843-9108-427A-A107-8A1CA404D5AE@cox.net
>
<http://mbox.abrazosdata.com/compose.php?to=EA049843-9108-427A-A107-8A1CA404
> D5AE@cox.net> >
> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
>
> 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.
>
>
>
>
>
> --
>
>
>
> Steve Gerow
>
> Pasadena, CA, USA
>
> BN6
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