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Are you sure the thermostat it working correctly? You didn't mention it.
CR
On 1/29/2021 8:12 PM, rolindsay@yahoo.com wrote:
> Hello friends. I haven't written to bother you for a long time, but
> now I do so because I need advice. My recently resurrected '72 MGB's
> engine runs hot. It doesn't boil over but it 'overheats'. Here are the
> details from two tests.
>
> 1972 MGB, idling from cold start, bonnet open, 50:50 antifreeze mix,
> heater valve open, new water pump, flushed radiator, 10# radiator cap,
> timing set correctly, air:fuel ratio set correctly, carbs balanced.
> First day tests, w/o electric fan on:
>
> Time
> Since   Coolant      Gauge
> Start   Temperature  Reading
> -----------+â??--------------------+--â??----------
> 0 min     71°F       minimum
> 1 min     72°F       minimum
> 5 min     160°F      1/4 scale
> 10 min    195°F      5/8 scale
> 15 min    220°F      7/8 scale
>
>
> Second day tests, with electric fan on:
>
> Time
> Since   Coolant       Gauge
> Start   Temperature  Reading
> -----------+â??--------------------+--â??----------
> 0 min     63°F       minimum
> 1 min     64°F       minimum
> 5 min     159°F      1/4 scale
> 10 min    195°F      5/8 scale
> 15 min    228°F      edge of 'H'
>
> Conclusions:
> 1. Engine starts easily, idles smoothly, and runs great.
> 2. No boil over in either test case.
> 3. Electric fan 'on' cannot overcome whatever is causing the car to
> run hot.
> 4. Temperatures measured at top of thermostat housing, but verified to
> be the same at the radiator top neck.
> 5. Charge is neither lean nor rich.
> 6. Timing is set correctly.
>
> What product might I use to flush debris from the block and head, if
> that is indeed the problem? Thoughts? And thanks.
>
> -Rick, in Houston, TX
>
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>
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<p>Are you sure the thermostat it working correctly? You didn't
mention it.</p>
<p>CR<br>
</p>
<div class="moz-cite-prefix">On 1/29/2021 8:12 PM,
<a class="moz-txt-link-abbreviated"
href="mailto:rolindsay@yahoo.com";>rolindsay@yahoo.com</a> wrote:<br>
</div>
<blockquote type="cite"
cite="mid:5a7d7848-6dd0-4fb3-897e-0dd38a95db02@email.android.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">
<div dir="auto">Hello friends. I haven't written to bother you
for a long time, but now I do so because I need advice. My
recently resurrected '72 MGB's engine runs hot. It doesn't
boil over but it 'overheats'. Here are the details from two
tests.</div>
<div dir="auto"><br>
</div>
<div dir="auto">1972 MGB, idling from cold start, bonnet open,
50:50 antifreeze mix, heater valve open, new water pump,
flushed radiator, 10# radiator cap, timing set correctly,
air:fuel ratio set correctly, carbs balanced.</div>
<div dir="auto">Â </div>
<div dir="auto">First day tests, w/o electric fan on:</div>
<div dir="auto"><br>
</div>
<div dir="auto">Time</div>
<div dir="auto">Since   Coolant      Gauge</div>
<div dir="auto">Start   Temperature  Reading</div>
<div
dir="auto">-----------+â??-----------------<wbr>---+--â??----------</div>
<div dir="auto">
<div dir="auto">0 min     71°F     Â
 minimum</div>
<div dir="auto">1 min     72°F     Â
 minimum</div>
<div dir="auto">5 min     160°F      1/4
scale</div>
<div dir="auto">10 min    195°F      5/8
scale</div>
<div dir="auto">15 min    220°F      7/8
scale</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto">
<div dir="auto">Second day tests, with electric fan on:</div>
<div dir="auto"><br>
</div>
<div dir="auto">Time</div>
<div dir="auto">Since   Coolant       Gauge</div>
<div dir="auto">Start   Temperature  Reading</div>
<div
dir="auto">-----------+â??--------------------+--â??----------</div>
<div dir="auto">0 min     63°F     Â
 minimum</div>
<div dir="auto">1 min     64°F     Â
 minimum</div>
<div dir="auto">5 min     159°F      1/4
scale</div>
<div dir="auto">10 min    195°F      5/8
scale</div>
<div dir="auto">15 min    228°F      edge of
'H'</div>
</div>
<div dir="auto"><br>
</div>
</div>
<div dir="auto">Conclusions:</div>
<div dir="auto">1. Engine starts easily, idles smoothly, and
runs great.</div>
<div dir="auto">2. No boil over in either test case.</div>
<div dir="auto">3. Electric fan 'on' cannot overcome whatever is
causing the car to run hot.</div>
<div dir="auto">4. Temperatures measured at top of thermostat
housing, but verified to be the same at the radiator top neck.</div>
<div dir="auto">5. Charge is neither lean nor rich.</div>
<div dir="auto">6. Timing is set correctly.</div>
<div dir="auto"><br>
</div>
<div dir="auto">What product might I use to flush debris from
the block and head, if that is indeed the problem? Thoughts?
And thanks.</div>
<div dir="auto"><br>
</div>
<div dir="auto">-Rick, in Houston, TX</div>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre"
wrap="">_______________________________________________
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href="http://autox.team.net/archive";>http://autox.team.net/archive</a>
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</pre>
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