1984 RX-7 Race Car with BP! (almost a Miata)
10-25-2013, 01:54 PM
#189
Well you don't want to go too big. The thermostat and water pump are usually restrictions to slow the water down to maximize heat absorption. So the smaller -16 (which is still pretty big) allows the water to slow down a bit!
Thank you! Once the water pump shows up, I can fire the engine up hopefully! The ID1000's just showed up last night too!
Thank you! Once the water pump shows up, I can fire the engine up hopefully! The ID1000's just showed up last night too!
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10-25-2013, 01:58 PM
#190
The thermostat's restriction isnt to slow the water down, its to create a pressure differential. You really want to flow the most volume of coolant possible in order to move the most heat. The size hose really just depends on how much you're flowing, but stock is 1 1/4ish which would be -20.
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10-25-2013, 02:02 PM
#191
If the water moves too quick, you will not absorb the heat fast enough. Trust me, we have used -16 before (and that is on rotary engine which produce quite a bit more wasted heat) with success. You go up to -20 and -24 and you will have localized overheating issues. The bigger is better does not work in this situation.
Thanks for pointing it out though. It's good to discuss these things!
Thanks for pointing it out though. It's good to discuss these things!
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10-25-2013, 02:16 PM
#194
You are right, the more flow, the more heat is taken away based on the science. So there is a fundamental flaw with my statement.
However there is a flaw in your statement: the area of the pipe in the system does not effect the flow directly. It effect the pressure drop across that pipe. So that means the pump will need to work harder to overcome that pressure drop. So saying because a pipe is 1" or 1.5", the flow across them will be more is not correct. If you put in 10gpm in there, 10gpm will come out. However it takes more force to get that 10gpm across. So the bigger size allows for less pressure drop.
However there is a flaw in your statement: the area of the pipe in the system does not effect the flow directly. It effect the pressure drop across that pipe. So that means the pump will need to work harder to overcome that pressure drop. So saying because a pipe is 1" or 1.5", the flow across them will be more is not correct. If you put in 10gpm in there, 10gpm will come out. However it takes more force to get that 10gpm across. So the bigger size allows for less pressure drop.
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10-25-2013, 02:19 PM
#195
You are right, the more flow, the more heat is taken away based on the science. So there is a fundamental flaw with my statement.
However there is a flaw in your statement: the area of the pipe in the system does not effect the flow directly. It effect the pressure drop across that pipe. So that means the pump will need to work harder to overcome that pressure drop. So saying because a pipe is 1" or 1.5", the flow across them will be more is not correct. If you put in 10gpm in there, 10gpm will come out. However it takes more force to get that 10gpm across. So the bigger size allows for less pressure drop.
However there is a flaw in your statement: the area of the pipe in the system does not effect the flow directly. It effect the pressure drop across that pipe. So that means the pump will need to work harder to overcome that pressure drop. So saying because a pipe is 1" or 1.5", the flow across them will be more is not correct. If you put in 10gpm in there, 10gpm will come out. However it takes more force to get that 10gpm across. So the bigger size allows for less pressure drop.
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10-25-2013, 02:29 PM
#196
Well Mazda's engineering was not perfect as the Miata does have hot spots (mostly due to the FWD engine in a RWD config). I have about 3.5ft (let's say 4ft of hose) were it is -16, rest is stainless pipe of 1.25" and bigger. The pump does not see much of a difference in pressure drop between the two -16 and -20 sizes. In addition Mazda did just their pipe to allow for minimal pressure drop a factory pump can take. At the end of it, the packaging and size of the -20 was sub-optimal and knowing -16 work just fine I went with that option. If you search most people are running -12 or -16 with this setup. I believe -12 is too small.
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10-29-2013, 12:46 PM
#198
Thanks! I have ordered the Meziere 55GPM and should be here Nov 5-Nov 15th according to tracking: Meziere Enterprises
I am putting the alternator on the diff as well as the water pump housing was pointing to the wrong direction, so it was an easy decision. In addition not having a thermostat, it is nice to have a pump to allow for a quicker warm up since I can have the pump off and controlled by the MS3.
I am putting the alternator on the diff as well as the water pump housing was pointing to the wrong direction, so it was an easy decision. In addition not having a thermostat, it is nice to have a pump to allow for a quicker warm up since I can have the pump off and controlled by the MS3.
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10-30-2013, 12:38 PM
#200
It does free up lots of room in the engine bay, reduces the noise that is introduced around the sensors and it's pretty much free energy since it's from the wheels.
On the other hand it does increase my unsprung weight, but at least it's on the rear! We shall see how my cast steel to steel weld will hold up!
On the other hand it does increase my unsprung weight, but at least it's on the rear! We shall see how my cast steel to steel weld will hold up!
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