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The Terminator
Engine/Tuning
Coolant system redesign/OEM style overflow tank elimination
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<blockquote data-quote="SecondhandSnake" data-source="post: 16418998" data-attributes="member: 116684"><p>The problem with that is that it isn't your highest point. You would want/need one at the crossover (or the equivalent for your setup.) That's going to lead to a sizeable unfilled portion.</p><p></p><p>If you wanted a really trick feature you could set it up with a vent and fill fitting. Put a small -4 size vent on your highest point (maybe one of the head outlets if you're using one of the AN adapter blocks) you could open during fill, and either put another small fill fitting on the other side or put a compucheck down low on the engine inlet that would let you pressure fill the system. Then you could just fill it hat way, and actually get a really good fill. A lot of OEM systems are configured that way.</p><p></p><p>Truth be told if I was more motivated I would put a compucheck fitting on my lower pipe and drain/fill the whole system from there. Just open my crossover plug, pressure fill it from the compucheck, and I wouldn't even need to deaerate/burp it.</p><p></p><p></p><p></p><p>If you have a pressure cap elsewhere in the system, you would not need a pressure cap on the expansion tank- you would need something that seals to a higher pressure than the pressure cap of the system. Basically it wouldn't regulate system pressure, and wouldn't need the outlet barb for venting. (Though two pressure cap systems are another design possibility and have some other considerations...)</p><p></p><p>However make sure wherever you do have the pressure cap you do have an outlet barb on it.</p><p></p><p></p><p></p><p>The concern there is how you're changing it from the stock configuration. With yours, when the thermostat is closed, the only outlet is the bypass out the back of the heads. In essence you could be creating the same problem with stagnating flow, but at the front of the head this time, at least during closed thermostat. Remember with the head cooling mod and the stock bypass it allows flow out of both the front and the rear of the head even with the thermostat closed. Yours would only allow the rear.</p></blockquote><p></p>
[QUOTE="SecondhandSnake, post: 16418998, member: 116684"] The problem with that is that it isn't your highest point. You would want/need one at the crossover (or the equivalent for your setup.) That's going to lead to a sizeable unfilled portion. If you wanted a really trick feature you could set it up with a vent and fill fitting. Put a small -4 size vent on your highest point (maybe one of the head outlets if you're using one of the AN adapter blocks) you could open during fill, and either put another small fill fitting on the other side or put a compucheck down low on the engine inlet that would let you pressure fill the system. Then you could just fill it hat way, and actually get a really good fill. A lot of OEM systems are configured that way. Truth be told if I was more motivated I would put a compucheck fitting on my lower pipe and drain/fill the whole system from there. Just open my crossover plug, pressure fill it from the compucheck, and I wouldn't even need to deaerate/burp it. If you have a pressure cap elsewhere in the system, you would not need a pressure cap on the expansion tank- you would need something that seals to a higher pressure than the pressure cap of the system. Basically it wouldn't regulate system pressure, and wouldn't need the outlet barb for venting. (Though two pressure cap systems are another design possibility and have some other considerations...) However make sure wherever you do have the pressure cap you do have an outlet barb on it. The concern there is how you're changing it from the stock configuration. With yours, when the thermostat is closed, the only outlet is the bypass out the back of the heads. In essence you could be creating the same problem with stagnating flow, but at the front of the head this time, at least during closed thermostat. Remember with the head cooling mod and the stock bypass it allows flow out of both the front and the rear of the head even with the thermostat closed. Yours would only allow the rear. [/QUOTE]
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Engine/Tuning
Coolant system redesign/OEM style overflow tank elimination
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