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The Terminator
Engine/Tuning
Cooling System Re-configuration?
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<blockquote data-quote="SecondhandSnake" data-source="post: 14095305" data-attributes="member: 116684"><p>I'm used to working with 9+L engines that only use an internal 1/2"-5/8" bypass line, and they seem to do fine. I would imagine a dinky 4.6 shouldn't require more than that, especially since it operates at significantly higher RPM, which would mean higher flow.</p><p></p><p>The Evans pump being discontinued would explain why I can't seem to find one (or their inline thermostat housings w/bypass.) Which is quite a shame, because the factory impeller design leaves much to be desired. That stamped sheet metal design doesn't look all that great, especially in comparison to the Evans in all its cast/machined impeller glory, which I would imagine both increase flow and reduce the chance of cavitation.</p><p></p><p>What I'm looking at now is essentially a modified stock setup:</p><p>In-line thermostat housing in the upper hose. This should give a better thermostat response based on the fact it is located pre-radiator, and it will mean I won't have to drain the whole system to replace either.</p><p>Bypass will be retained, but likely necked way down to the 1/2"-5/8" range. Better clearance and more flexibility without sacrificing warm-up.</p><p>Lower hose will be changed to a GT hose.</p><p>Generic surge tank w/cap will be mounted wherever I find the space (plenty high of course).</p><p>Surge tank and bypass will be Y-ed into the lower GT hose.</p><p>Vent lines, one from the radiator and one from the crossover plug will go into the surge tank. That should make deaeration much much easier.</p><p></p><p>Overall that should clean up the engine bay for around $100, all the while retaining and/or improving performance.</p></blockquote><p></p>
[QUOTE="SecondhandSnake, post: 14095305, member: 116684"] I'm used to working with 9+L engines that only use an internal 1/2"-5/8" bypass line, and they seem to do fine. I would imagine a dinky 4.6 shouldn't require more than that, especially since it operates at significantly higher RPM, which would mean higher flow. The Evans pump being discontinued would explain why I can't seem to find one (or their inline thermostat housings w/bypass.) Which is quite a shame, because the factory impeller design leaves much to be desired. That stamped sheet metal design doesn't look all that great, especially in comparison to the Evans in all its cast/machined impeller glory, which I would imagine both increase flow and reduce the chance of cavitation. What I'm looking at now is essentially a modified stock setup: In-line thermostat housing in the upper hose. This should give a better thermostat response based on the fact it is located pre-radiator, and it will mean I won't have to drain the whole system to replace either. Bypass will be retained, but likely necked way down to the 1/2"-5/8" range. Better clearance and more flexibility without sacrificing warm-up. Lower hose will be changed to a GT hose. Generic surge tank w/cap will be mounted wherever I find the space (plenty high of course). Surge tank and bypass will be Y-ed into the lower GT hose. Vent lines, one from the radiator and one from the crossover plug will go into the surge tank. That should make deaeration much much easier. Overall that should clean up the engine bay for around $100, all the while retaining and/or improving performance. [/QUOTE]
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