Stock H/E Delete.
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Joined: 03-09-08
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From: Brandon, Florida
Cooling will be better while driving w/ just an aftermarket h/e rather than running both. But it will heat soak faster at a stop. Thats what your saying right? If that's the case, the two different setups suit different people. For example, I do not race from a dig or at the track, but instead like to step on it in 2nd quite a bit so running just the CXR benefits me more. Thanks for the info. Ebristol. This should clear some stuff up for people.
Excellent point. I really is a personal decision. If you don't do a lot of stop and go driving or never go to the drag strip then a FMIC all by itself might work great for you.
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From: Shitsylvania
Interesting thank you guys for making this a civil Q & A on this.
I think I will be ordering a h/e as soon as the tax money comes in and installing my dual pass and tank and will post up the results.
I think I will be ordering a h/e as soon as the tax money comes in and installing my dual pass and tank and will post up the results.
You're not taking the entire situation into account. in talking about exposure time to air, it's the same in single or dual pass. The pump is what determines flow rate and that doesn't change. The coolant is in the radiator for the same amount of time regardless of whether it's single or dual pass.
If the pump is flowing 4GPM and the radiator hold 1 gallon, then the fluid will be in the radiator for 15 seconds regardless of whether it's single or dual pass. In the above scenereo if it's dual pass the coolant has to flow double the speed through the radiator to move at 4GPM. In single pass the coolant moves slower. In dual pass the inlet coolant (hottest) is touching the outlet coolant (coolest) and separated only by a thin piece of aluminum making the radiator inefficient.
Another example. Let's say you have two radiators, each is 6" high, 2" thick and 12" wide. Coolant flows into one and then the next. Or are you better off flowing 1/2 the coolant into one and 1/2 the coolant into the other? It's the same. In both cases the coolant is exposed to the same amount of cool time in 'a' radiator and your total core area, which is doing the cooling, has not changed.
now take the above two radiators can weld the outlet to the inlet. See the problem? After the water is cooled, it will be heated again by the incoming hot water because the tanks would be touching.
All the HE's on the market are dual pass so we'd have to build one custom to measure if there is a difference. I'll put one of our engineers on it when I get a chance I guess because I'm curious.
If the pump is flowing 4GPM and the radiator hold 1 gallon, then the fluid will be in the radiator for 15 seconds regardless of whether it's single or dual pass. In the above scenereo if it's dual pass the coolant has to flow double the speed through the radiator to move at 4GPM. In single pass the coolant moves slower. In dual pass the inlet coolant (hottest) is touching the outlet coolant (coolest) and separated only by a thin piece of aluminum making the radiator inefficient.
Another example. Let's say you have two radiators, each is 6" high, 2" thick and 12" wide. Coolant flows into one and then the next. Or are you better off flowing 1/2 the coolant into one and 1/2 the coolant into the other? It's the same. In both cases the coolant is exposed to the same amount of cool time in 'a' radiator and your total core area, which is doing the cooling, has not changed.
now take the above two radiators can weld the outlet to the inlet. See the problem? After the water is cooled, it will be heated again by the incoming hot water because the tanks would be touching.
All the HE's on the market are dual pass so we'd have to build one custom to measure if there is a difference. I'll put one of our engineers on it when I get a chance I guess because I'm curious.
I was going to say this, but changed my mind part way through:
The primary benefit I see to using a dual pass design is that you are increasing the likelihood of having a uniform heat dissipation. If in a single pass, say, the top, or the bottom, was not exposed to as much airflow, you would have a warmer area, opposed to using a dual pass design which would ensure the same unit of water flows to both the top and the bottom
I realized this also would not matter though, because if the airlfow is the same in both models, you will have a hot upper half and a colder lower half with a single pass, assuming the upper half is partially hidden under the bumper. After the coolant comes out and the coolant from the top and the bottom mix, it should be X degrees. I realized that in a dual pass, with the same unit of water getting to the parts with more airflow, yet spending less time in those parts, you will come out to have the same average temperature of X degrees.
After thinking about this then, the only differences i can see are simplicity of hose attachments, and a dual pass not separating hot from cold as much as a single pass would. But the average temperature would still remain the same, and a single pass' output side through 3/4" hose would force the hotter top half and cooler lower half of coolant to mix anyway. So I guess there is no benefit...
EDIT: theres also the fact that a dual pass would cause more resistance to flow than a single pass, being that there is less area to flow in (which is why the rate must double), so for our centrifugal pumps, it would inhibit flow slightly, though the added hose in a single pass probably makes up for its slight advantage in that area.
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