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Re: [Healeys] BJ8 radiator cap issue

To: healeys@autox.team.net
Subject: Re: [Healeys] BJ8 radiator cap issue
From: Bob Spidell <bspidell@comcast.net>
Date: Fri, 29 Mar 2013 07:09:04 -0700
Delivered-to: mharc@autox.team.net
Delivered-to: healeys@autox.team.net
References: <2757CD3A-7065-43C9-BE4A-DC24F2EDF199@gmail.com> <002b01ce2c83$54b4dc40$fe1e94c0$@warner-associates.com> s=q20121106; t=1364566150; bh=Bhvx2V6dKZVSxFHZwWE1RiqqVPbj1p6H2zO4YgunDw8=; h=Received:Received:Message-ID:Date:From:MIME-Version:To:Subject: Content-Type; b=YeYpsjnz7i1HlrGD1GXjQ4JB5QShq8FtbskLknmMY/+ckDb3WHjTTemXR1Iq0slGV wR9r3SmZBQf1izP9rUSFVnJoApmrgOpX+tC9sPC0QMDOMOriZ7/Et4T9vYwPpVumnu UIn4XBTQ3J0lkXG9KNvNVYoBE7eD72ynu4YIKGlhfcSDt9a7ZlAjBvDIp4WhfAB3y3 ZWaWtkFBhnWbDd+YAdjmvhU9nLvQt1Ao+LlABRsfqMSJheCqjlYzqTQB8PRTFXAvfw Gll4rzwmkcej5Ypai/ZCmrUAjBmJuzjmMShItzRnPZJ4PQapVLS3QZPxA2J4K1fFol PPzFXV/REDnnA==
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130307 Thunderbird/17.0.4
Doesn't make sense, at least according to the laws of physics I pretend to 
understand.

If you didn't boil or lose coolant with a 7lb cap, it means you never reached 
7lb. pressure in your cooling system.  So 
the 10lb cap should never open, either.  The additional 3lbs pressure would 
only give a few more degrees before boiling, 
which doesn't appear to be an issue with your car (Law of Physics: the boiling 
point of a fluid is directly related to 
ambient pressure; that's why boiling cooks foods slower at higher altitude).

IOW, the cap doesn't regulate pressure in the cooling system (like a voltage 
regulator)--it's there to keep your hoses, 
etc. from exploding if your engine overheats.


Bob


On 3/29/2013 6:42 AM, Dan Stromquist wrote:
> Water pump issue?
>
>
>
> Hi all, about 2 months ago there was a thread indicated that the correct
> radiator cap for a BJ8 was a long neck 10 lb. cap.
>
> News to me but since a couple agreed, I ordered one to see if there would be
> a difference.
>
> I have been running a 7 lb. cap with 180 degree sleeved thermostat. With
> this setup, I've had an idle temp right at 180 degrees when warmed up.
>
> When I changed to the 10 lb. cap (with same thermostat) the BJ8 immediately
> ran 200 - 205 degrees at warm idle. Switching back to the 7 lb. cap brought
> the idle temp right back down to 180 degrees.
>
> Why would this be?
>
> Randy
>

-- 
*******************************************************************
Bob Spidell           San Jose, CA            bspidell@comcast.net

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