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The Terminator
Engine/Tuning
Coolant cross over delete and fuel filter?
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<blockquote data-quote="SecondhandSnake" data-source="post: 17025948" data-attributes="member: 116684"><p>It's usually done for clearance issues. I did mine for a combination of clearance, temperature, and better deaeration (burping) performance.</p><p></p><p>First off, you could probably just get away with reducing the bypass size and going to a smaller flexible hose rather than a large diameter molded one. I think Ford primarily ran that large one to work with the lower thermostat. I stepped down to a 3/4" flexible line on mine with no adverse affects. As long as you don't omit the bypass entirely you should be fine. </p><p></p><p>Second, an upper and lower thermostat perform a little differently. The lower actually allows for a better, more consistent coolant temperature. With the upper thermostat, when it opens, you get a big slug of cold water from the radiator. That causes it to oscillate a bit before it stabilizes. The lower thermostat better meters the cold water from the radiator since it's directly in contact with it. The downsides of the lower thermostat are that it doesn't fill well (as we all know), and that it doesn't sense and react to the engine outlet coolant temperature as well. What may be 220F coming out the top of the engine might be more like 210 or 205F at the thermostat. It takes some adjustment to get the actual performance you want, whereas with an upper thermostat 200F is 200F. </p><p></p><p>Of course, there's also the matter of the surge tank and vent lines, and surge tank vs. recovery bottle depending on how you configure it. A lot of crossover deletes also delete the surge tank, which I would advise against. But that's another topic. </p><p></p><p>Personally I'm running a generic inline SBC thermostat housing in mine, a 3/4" bypass, and a 2qt expansion tank. It fills, deaerates, and holds temperature like a charm. (But I would expect it to being designed by a cooling system engineer.)</p></blockquote><p></p>
[QUOTE="SecondhandSnake, post: 17025948, member: 116684"] It's usually done for clearance issues. I did mine for a combination of clearance, temperature, and better deaeration (burping) performance. First off, you could probably just get away with reducing the bypass size and going to a smaller flexible hose rather than a large diameter molded one. I think Ford primarily ran that large one to work with the lower thermostat. I stepped down to a 3/4" flexible line on mine with no adverse affects. As long as you don't omit the bypass entirely you should be fine. Second, an upper and lower thermostat perform a little differently. The lower actually allows for a better, more consistent coolant temperature. With the upper thermostat, when it opens, you get a big slug of cold water from the radiator. That causes it to oscillate a bit before it stabilizes. The lower thermostat better meters the cold water from the radiator since it's directly in contact with it. The downsides of the lower thermostat are that it doesn't fill well (as we all know), and that it doesn't sense and react to the engine outlet coolant temperature as well. What may be 220F coming out the top of the engine might be more like 210 or 205F at the thermostat. It takes some adjustment to get the actual performance you want, whereas with an upper thermostat 200F is 200F. Of course, there's also the matter of the surge tank and vent lines, and surge tank vs. recovery bottle depending on how you configure it. A lot of crossover deletes also delete the surge tank, which I would advise against. But that's another topic. Personally I'm running a generic inline SBC thermostat housing in mine, a 3/4" bypass, and a 2qt expansion tank. It fills, deaerates, and holds temperature like a charm. (But I would expect it to being designed by a cooling system engineer.) [/QUOTE]
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Coolant cross over delete and fuel filter?
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