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SVT Shelby GT500
GT500 IC/HE Pump Comparison
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<blockquote data-quote="ShelbyGT5HUN" data-source="post: 15075973" data-attributes="member: 161356"><p>Interesting that you would say that, as another member has "thermal engineers" telling him you can't have to much pump, and I said you can. Bubbles don't cool, you need smooth flow to make contact. When a pump cavitates, you will overheat, plain and simple. Tell that to your "thermal engineer" lol...</p><p></p><p></p><p>*************************</p><p>Also, if you had to pick, bigger pump or bigger HE, you will always choose bigger HE. Ideally, you would want a large HE, and a small flowing (4gpm) pump. You will always run out of HE capacity before you run out of pump.</p><p></p><p>If you had an "ocean sized" capacity, pump speed could be 4oz/min, and you would never overheat. Put 4oz of water on a gas stove ("IAT2" of burning natural gas about 3500F), and try to boil it, your flow is 0, but it would take several minutes to boil. </p><p></p><p>The coolant could sit there for several minutes, in the IC, without boiling. It won't boil instantly, or within one minute....so you can see with a 0 gpm pump, you would have a few mins before your coolant boils with the 350F or so temps the supercharger charged air temp creates (much less than 3500F!).</p><p></p><p>Again:</p><p></p><p>small HE + fast pump = overheating due to coolant capacity and possibly cavitation</p><p></p><p>small HE + slow pump = overheating due to capacity, not flow!</p><p></p><p>LARGE HE + slow pump = no problems</p><p></p><p>LARGE HE + fast pump = overheating if flow exceeds restriction</p><p></p><p>So, however you look at it, you need to size the pump correctly, and if you overheat, it MORE THAN LIKELY will always be because of coolant capacity, NOT pump flow, unless the pump is too large for the system. </p><p></p><p>It's the same reason you couldn't drive your car at top speed, or max rated HP, until you ran out of gas, you would OVERHEAT at some point, due to capacity, nothing else (obviously not airflow / fans, and a bigger water pump won't help you either, only adding more coolant capacity will)!!</p><p></p><p>When you lap a road course, unless you have enough coolant capacity, you will eventually overheat. Both the HE and radiator are closed systems, and nothing works 100% efficiently, so each lap adds just a little more heat than can be rejected. So this "BIGGEST PUMP I CAN FIT IS BEST", is an incorrect blanket statement.</p><p></p><p>Death by a 1000 cuts....</p><p></p><p>********************************************</p><p>Now, on short bursts, a faster pump will work, as long as it's not exceeding the inherent restriction in the system and the pump you are replacing was UNDERSIZED TO BEGIN WITH, but after one complete cycle of the coolant, you WILL RAISE IAT2s. So for short drag racing bursts, properly sizing a larger pump to your set up will work, but once that coolant has made a complete round trip, your IAT2s WILL RISE incrementally. Ideally for drag racing, you would want enough flow to get 100% of the coolant through the IC just as you cross the line. Circulating more than once, too fast will raise temps.</p></blockquote><p></p>
[QUOTE="ShelbyGT5HUN, post: 15075973, member: 161356"] Interesting that you would say that, as another member has "thermal engineers" telling him you can't have to much pump, and I said you can. Bubbles don't cool, you need smooth flow to make contact. When a pump cavitates, you will overheat, plain and simple. Tell that to your "thermal engineer" lol... ************************* Also, if you had to pick, bigger pump or bigger HE, you will always choose bigger HE. Ideally, you would want a large HE, and a small flowing (4gpm) pump. You will always run out of HE capacity before you run out of pump. If you had an "ocean sized" capacity, pump speed could be 4oz/min, and you would never overheat. Put 4oz of water on a gas stove ("IAT2" of burning natural gas about 3500F), and try to boil it, your flow is 0, but it would take several minutes to boil. The coolant could sit there for several minutes, in the IC, without boiling. It won't boil instantly, or within one minute....so you can see with a 0 gpm pump, you would have a few mins before your coolant boils with the 350F or so temps the supercharger charged air temp creates (much less than 3500F!). Again: small HE + fast pump = overheating due to coolant capacity and possibly cavitation small HE + slow pump = overheating due to capacity, not flow! LARGE HE + slow pump = no problems LARGE HE + fast pump = overheating if flow exceeds restriction So, however you look at it, you need to size the pump correctly, and if you overheat, it MORE THAN LIKELY will always be because of coolant capacity, NOT pump flow, unless the pump is too large for the system. It's the same reason you couldn't drive your car at top speed, or max rated HP, until you ran out of gas, you would OVERHEAT at some point, due to capacity, nothing else (obviously not airflow / fans, and a bigger water pump won't help you either, only adding more coolant capacity will)!! When you lap a road course, unless you have enough coolant capacity, you will eventually overheat. Both the HE and radiator are closed systems, and nothing works 100% efficiently, so each lap adds just a little more heat than can be rejected. So this "BIGGEST PUMP I CAN FIT IS BEST", is an incorrect blanket statement. Death by a 1000 cuts.... ******************************************** Now, on short bursts, a faster pump will work, as long as it's not exceeding the inherent restriction in the system and the pump you are replacing was UNDERSIZED TO BEGIN WITH, but after one complete cycle of the coolant, you WILL RAISE IAT2s. So for short drag racing bursts, properly sizing a larger pump to your set up will work, but once that coolant has made a complete round trip, your IAT2s WILL RISE incrementally. Ideally for drag racing, you would want enough flow to get 100% of the coolant through the IC just as you cross the line. Circulating more than once, too fast will raise temps. [/QUOTE]
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GT500 IC/HE Pump Comparison
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