>
>To:jurrasm@genesis.torrco.com (Mark Jurras)
>From:homestay@infolearn.com.au (Syl's Sydney Homestay)
>Subject:Re: Freeze plug for MG TC
>
>Mark
>
>I think the formula you are looking for is that for Charles Law, which
>from my old physics days goes something like:
> P1V1/T1 = P2V2/T2
>
>Where P = Pressure; V = Volume and T = Temperature
>
>Given that the volume is constant, and atmospheric pressure at sea level
>is 32 psi we have for a system running at 15 psi ( which I think is pretty
>high)
>
> 32/212 = (32 + 15)/T2
>
> So T2 = 47 x 212/32 = 311 degrees F.
>
>Any advance on 311 degrees?
>
>Paul
>48 TC
>
>
>
>>> > What should be
>>> >>used as cooling water just purified water or a regular coolant for a
>>> >>modern car. I do not expect any temperatures below freezing point.
>>> >
>>> >For California, use only distilled water without coolant as you have a
>>> >non-sealed system.
>>
>>It is a good idea to put in an overflow reservoir in older cars. When
>>the system heats up the cap will bleed off excess coolant if the
>>radiator is over-filled when cold. When it cools air is sucked in. The
>>air can contribute to the corrosion process, even with added inhibitors.
>>
>>The closed systems suck the overflow back in so the system is always
>>full. Minimum air. For those of us who like originality the overflow
>>tank can be made removable for shows.
>>
>>
>>>
>>> >I disagree with the writer that suggests a 50/50 mix of antifreeze. That is
>>> >fine for winter driving, but in 85+F. weather, you may boil over as the
>>> >antifreeze lowers the boiling point as well as lowering the freezing point
>>> >(which is irrelevant here). I'd like to see more discussion on the topic of
>>> >coolants.
>>> >
>>
>>The antifreeze shouldn't alter the boiling point significantly. What does
>>alter it is the pressure of the system. An open (unpressurised) system
>>boils at around 212 F. The same system at 15 psi boils at 265 F.
>>Pressurre is the key to preventing boil. I don't have the formula so
>>can somone tell me what temperature my '67 B will boil sith the 7 psi
>>cap?
>>
>>- -Mark
>
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