<div dir="ltr"><div></div><div>Hello,</div><div><br></div><div>There's been a comment that the list has been quiet lately and we need a topic that will generate more discussion. I'd like to suggest Healey cooling and thermostats as a potential topic.</div><div><br></div><div>A general comment about systems with a control valve, which describes a Healey cooling system: for the system to be controlled by the thermostat, it should never be 100% open or closed. When fully open or closed, the thermostat isn't controlling. Ideally, the thermostat would be 50% open when the engine is fully warmed up on a 70°F day. I've found my 180° thermostat controls well in the summer, but when the temperature drops below 60°F, it takes a long time for the thermostat to start opening, and it likely operates in a narrow portion of its range. It makes sense to switch to a 160° thermostat for driving in temperatures below 60°F for extended periods.</div><div><br></div><div>There's a bypass in the block that allows water to recirculate without crossing the thermostat and entering the radiator. This aids faster warm-up and prevents the water pump from dead-heading when the thermostat is closed. As others have mentioned, the older bellows-style thermostats had a sleeve that restricted bypass flow as the thermostat opened. I've been told the 4-cylinder Healey engines lack this bypass. Blocking the bypass will slow engine warm-up; the bypass should be restricted once the water reaches 180°.</div><div><br></div><div>I'm aware of a couple of options to restrict the bypass. The easiest is to use a FlowKooler thermostat, which I use. They're high-quality, high-flow thermostats that partially restrict the bypass when open. The other practical option is to modify a Land Rover thermostat (Land Rover Thermostat 596225, for those interested). The sleeve must be cut off the top so it sits flush in the housing. I used a Dremel to cut the sleeve off and have pictures if anyone is interested.</div><div><br></div><div>You have the correct temperature thermostat when the water temperature stays within 20°F of the opening temperature under most driving conditions.</div><div><br></div><div>Comments are welcome. </div><div><br></div><div>Regards,</div><div>Harold</div><div><br></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Mon, Feb 17, 2025 at 3:44 AM sbyers--- via Healeys <<a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="msg1469297646709061552"><div lang="EN-US" style="overflow-wrap: break-word;"><div class="m_1469297646709061552WordSection1"><p class="MsoNormal"><font size="2" face="Aptos"><span style="font-size:11pt">Since I tried Hylomar, it is all that I use on gaskets (Permatex has an equivalent).<span> </span>It seals well and is non-setting.<u></u><u></u></span></font></p><p class="MsoNormal"><font size="2" face="Aptos"><span style="font-size:11pt">For thermostats, I tried the sleeved 160 that Moss offered (apparently no one had a sleeved 180) in my BJ8 and found that in the wintertime I had to actually block half of the radiator to get the coolant to come up to temperature.<span> </span>Later, I was fortunate to be able to score an original NOS sleeved 180 made by AC from Kees Oudersluijs who was active on this list and got a couple of spares as insurance.<span> </span><u></u><u></u></span></font></p><p class="MsoNormal"><font size="2" face="Aptos"><span style="font-size:11pt">A thermostat doesn’t really “control” the coolant temperature, but reacts to it depending on the coolant flow and temperature of the air through the radiator. <span> </span>Initially, it limits the flow for faster warm-up of the engine.<span> </span>Once it is wide open, it is out of the loop.<u></u><u></u></span></font></p><p class="MsoNormal"><font size="2" face="Aptos"><span style="font-size:11pt"><u></u> <u></u></span></font></p><p class="MsoNormal"><font size="2" face="Aptos"><span style="font-size:11pt">Steve Byers<u></u><u></u></span></font></p><p class="MsoNormal"><font size="2" face="Aptos"><span style="font-size:11pt">BJ8 Registry<u></u><u></u></span></font></p><p class="MsoNormal"><font size="2" face="Aptos"><span style="font-size:11pt">AHCA Delegate at Large<u></u><u></u></span></font></p><p class="MsoNormal"><font size="2" face="Aptos"><span style="font-size:11pt"><u></u> <u></u></span></font></p><div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0in 0in"><p class="MsoNormal"><b><font size="2" face="Calibri"><span style="font-size:11pt;font-family:Calibri,sans-serif;font-weight:bold">From:</span></font></b><font size="2" face="Calibri"><span style="font-size:11pt;font-family:Calibri,sans-serif"> Healeys <<a href="mailto:healeys-bounces@autox.team.net" target="_blank">healeys-bounces@autox.team.net</a>> <b><span style="font-weight:bold">On Behalf Of </span></b>Michael Oritt<br><b><span style="font-weight:bold">Sent:</span></b> Sunday, February 16, 2025 7:06 PM<br><b><span style="font-weight:bold">To:</span></b> Healeys at Autox <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>><br><b><span style="font-weight:bold">Subject:</span></b> [Healeys] Thermostat gasket sealant<u></u><u></u></span></font></p></div><p class="MsoNormal"><font size="3" face="Aptos"><span style="font-size:12pt"><u></u> <u></u></span></font></p><div><div><p class="MsoNormal"><font size="3" color="#3333ff" face="Aptos"><span style="font-size:12pt;color:rgb(51,51,255)">My 100 will not come up to temperature (at least yet) with a 160 thermostat. I am putting in a 180 and wonder what is the preferred gasket dressing?<u></u><u></u></span></font></p></div><div><p class="MsoNormal"><font size="3" color="#3333ff" face="Aptos"><span style="font-size:12pt;color:rgb(51,51,255)"><u></u> <u></u></span></font></p></div><div><p class="MsoNormal"><font size="3" color="#3333ff" face="Aptos"><span style="font-size:12pt;color:rgb(51,51,255)">Best--Michael Oritt<u></u><u></u></span></font></p></div></div></div></div>_______________________________________________<br>
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