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The Terminator
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Mod Motor Cooling System
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<blockquote data-quote="SlowSVT" data-source="post: 14854488" data-attributes="member: 20202"><p>The next item of topic is the radiator. Some brands use plastic end caps which won't conduct the heat away as well as an aftermarket unit with aluminum end caps ........ avoid those brands. Regarding the number of cores I've heard from people who have run both a single and dual core radiator was there was no difference in the engine operating temperature between the two in a road racer which is the most punishing form of motorsports from a heat perspective. A single core will pass a higher volume of air than a dual core which has twice the surface area. I would imagine a dual core rad would benefit more from sealing the gaps on the intake side which will force more air thru it to help overcome the added resistance to flow which may result in better cooling then the single core. The fin count is something to pay attention to when shopping for a new radiator where a lower count on a dual core will flow closer to that of a single row with a higher fin count. Some rads have corrugated fins to increase surface area even more but the flow thru rate will suffer having to navigate all those pleats. </p><p></p><p> With regard to single pass vs. multi pass I lean toward a single pass which will be easier on the pump and will have a higher flow rate. A multi pass is nothing more than two or more smaller radiators connected in series. Here is a diagram I drew to illustrate the difference (sorry about the small print I should have chosen a larger front). This is for a rainy day and Budweiser.</p><p></p><p>[ATTACH=full]642537[/ATTACH]</p><p></p><p> As you can see the single pass has double and triple the cross section coolant path than a double or triple pass and will move slower thru the core reducing the flow resistance and not having to switch directions back and forth.</p><p></p><p></p><p> As far as fans are concerned I like the factory shroudless fan where some have advocated the Lincoln MK VIII fan which is very powerful and heavily shrouded. That's great for a limousine sitting idle at the airport in the hot sun with the AC blasting but a Terminator is designed as a "moving vehicle" which in that case your better off with no fan at all. The shroud itself on the MK VIII fan assembly forces all the air to pass thru the fan opening past all those blades, fan motor mtg struts and the grill work rather then just straight out the back of the radiator. If you are sitting stuck in traffic a low compression mod motor will actually run cooler that an NA car with high compression. The Cobra fan is a nice balance between having a fan with minimal restrictions that won't impede air flow much when it's not needed and will keep the engine out of trouble in stop & go traffic.</p><p></p><p> there are a couple of things you can do to improve the performance of the factory fan. There is a gap between the radiator fins and the fan scroll which will pull some of the air between this gap reducing the air getting drawn thru the radiator. Aircraft Spruce p/n: <span style="color: #FF0000">05-01300 </span>is a single channel rubber cord that seals this gap perfectly and just pushes over the lip on the scroll.</p><p></p><p><a href="http://www.aircraftspruce.com/catalog/appages/uchannel.php?clickkey=5038" target="_blank">http://www.aircraftspruce.com/catalog/appages/uchannel.php?clickkey=5038</a></p><p></p><p>[ATTACH=full]642538[/ATTACH]</p><p></p><p> Something a little more time consuming and of questionable merit is removing all the mold lines in the fan support. If you run your fingers along the molded plastic every opening has a sharp parting line. A piece of 400 grit and scotchbrite will smooth all the ridges which should move a few more cfm thru the support whether the fan is running or not.</p></blockquote><p></p>
[QUOTE="SlowSVT, post: 14854488, member: 20202"] The next item of topic is the radiator. Some brands use plastic end caps which won't conduct the heat away as well as an aftermarket unit with aluminum end caps ........ avoid those brands. Regarding the number of cores I've heard from people who have run both a single and dual core radiator was there was no difference in the engine operating temperature between the two in a road racer which is the most punishing form of motorsports from a heat perspective. A single core will pass a higher volume of air than a dual core which has twice the surface area. I would imagine a dual core rad would benefit more from sealing the gaps on the intake side which will force more air thru it to help overcome the added resistance to flow which may result in better cooling then the single core. The fin count is something to pay attention to when shopping for a new radiator where a lower count on a dual core will flow closer to that of a single row with a higher fin count. Some rads have corrugated fins to increase surface area even more but the flow thru rate will suffer having to navigate all those pleats. With regard to single pass vs. multi pass I lean toward a single pass which will be easier on the pump and will have a higher flow rate. A multi pass is nothing more than two or more smaller radiators connected in series. Here is a diagram I drew to illustrate the difference (sorry about the small print I should have chosen a larger front). This is for a rainy day and Budweiser. [ATTACH=full]642537[/ATTACH] As you can see the single pass has double and triple the cross section coolant path than a double or triple pass and will move slower thru the core reducing the flow resistance and not having to switch directions back and forth. As far as fans are concerned I like the factory shroudless fan where some have advocated the Lincoln MK VIII fan which is very powerful and heavily shrouded. That's great for a limousine sitting idle at the airport in the hot sun with the AC blasting but a Terminator is designed as a "moving vehicle" which in that case your better off with no fan at all. The shroud itself on the MK VIII fan assembly forces all the air to pass thru the fan opening past all those blades, fan motor mtg struts and the grill work rather then just straight out the back of the radiator. If you are sitting stuck in traffic a low compression mod motor will actually run cooler that an NA car with high compression. The Cobra fan is a nice balance between having a fan with minimal restrictions that won't impede air flow much when it's not needed and will keep the engine out of trouble in stop & go traffic. there are a couple of things you can do to improve the performance of the factory fan. There is a gap between the radiator fins and the fan scroll which will pull some of the air between this gap reducing the air getting drawn thru the radiator. Aircraft Spruce p/n: [COLOR="#FF0000"]05-01300 [/COLOR]is a single channel rubber cord that seals this gap perfectly and just pushes over the lip on the scroll. [url]http://www.aircraftspruce.com/catalog/appages/uchannel.php?clickkey=5038[/url] [ATTACH=full]642538[/ATTACH] Something a little more time consuming and of questionable merit is removing all the mold lines in the fan support. If you run your fingers along the molded plastic every opening has a sharp parting line. A piece of 400 grit and scotchbrite will smooth all the ridges which should move a few more cfm thru the support whether the fan is running or not. [/QUOTE]
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