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The Terminator
Engine/Tuning
Coolant system redesign/OEM style overflow tank elimination
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<blockquote data-quote="JCDriller" data-source="post: 16419116" data-attributes="member: 194592"><p>[USER=116684]@SecondhandSnake[/USER] I REALLY appreciate your input. I put my comments in red. Thank you again.</p><p></p><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><span style="color: #b30000">Would this be a problem if the system was filled while the car was on ramps so that it was the highest point? Would air somehow find its way back in?</span></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><span style="color: #b30000">I just rewatched the video on the Cobra Engineering Cross Over delete. It looks like he included a fill port in the drivers side cross over adapter. I'll email him to verify that is what it is, but I think this makes filling the system a snap. </span></p><p><span style="color: #b30000"></span></p><p><span style="color: #b30000">[ATTACH=full]1640530[/ATTACH] </span></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><span style="color: #b30000">If I put a 16psi pressure cap on the SN95 radiator and I kept a expansion tank that was sealed (no pressure cap) in the fender coming off the lower radiator hose would I then also need an overflow tank hooked up to that outlet barb?</span></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><p></p><p><span style="color: #b30000">I'm following you now, I can see how until the thermostat opens nothing is flowing off the front of the heads. going back to the cobra engineering photo above there is a second threaded port in the passengers side adapter that is for additional sensors if needed. I could make that a bypass too, ting the rear drivers side head into the front passengers side head then to the thermostat. this would at least give some flow out of the front of the heads. Thoughts on this approach</span></p></blockquote><p></p>
[QUOTE="JCDriller, post: 16419116, member: 194592"] [USER=116684]@SecondhandSnake[/USER] I REALLY appreciate your input. I put my comments in red. Thank you again. 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. [color=#b30000]Would this be a problem if the system was filled while the car was on ramps so that it was the highest point? Would air somehow find its way back in?[/color] 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. [color=#b30000]I just rewatched the video on the Cobra Engineering Cross Over delete. It looks like he included a fill port in the drivers side cross over adapter. I'll email him to verify that is what it is, but I think this makes filling the system a snap. [ATTACH=full]1640530[/ATTACH] [/color] 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. [color=#b30000]If I put a 16psi pressure cap on the SN95 radiator and I kept a expansion tank that was sealed (no pressure cap) in the fender coming off the lower radiator hose would I then also need an overflow tank hooked up to that outlet barb?[/color] 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. [color=#b30000]I'm following you now, I can see how until the thermostat opens nothing is flowing off the front of the heads. going back to the cobra engineering photo above there is a second threaded port in the passengers side adapter that is for additional sensors if needed. I could make that a bypass too, ting the rear drivers side head into the front passengers side head then to the thermostat. this would at least give some flow out of the front of the heads. Thoughts on this approach[/color] [/QUOTE]
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Coolant system redesign/OEM style overflow tank elimination
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