trippled
NAXJA Forum User
- Location
- colorado springs, co
Good deal! Although it sounds like you need fans anyways, keep in mind they do very little if anything at higher speeds. I'm not sure how fast you're going though.
What is your compression ratio, what grade fuel?OK...here it goes: I have a 1989 renix that pretty much has nothing old left on it. 6" lift with 35's and about 1000lbs over stock. engine is 4.0 with comp cam and polished and ported head, bored out throttle body, spacer, headers, and a high flow intake...blah blah blah...
but when I need to climb on a load up to the mountains on a highway, it creeps up to 240 easy, and I have to pull over letting it run in park, cool off and try again.
Get rid of the fans, they don't help at all. No electric fan that will fit in the space will pull as much as an OEM electric fan. Search for the ZJ fan clutch and use that plus the OEM fan and an OEM electric fan.
(although at +35 speeds fans are out of the equation).
Agreed.
I am leery of the "coolant flowing too fast for effective cooling" argument as an engineer because it doesn't make logical sense to me, but I haven't done the test I need to on my 88 MJ yet so I will not argue that... yet. Pretty sure its thermostat is currently stuck open, so I am going to remove it and see what happens, then put in a stant 195 and compare.
Brand new cat flowmaster...air fuel mixture rich to ideal
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The coolant flowing too fast to transfer heat is completely false.
The t-stat back pressure may prevent pump cavitation but nothing is needed in addition to a the factory t-stat as proven by millions of xj's.
At the end of the day, I ended up with an upgraded radiator and stock everything else for the best cooling.
Maybe I'm just not hard enough on my jeep to justify more?
However you want to reword it the answer is the same it's a myth.
The transfer of heat at the radiator will be maxed out by increased flow rate. Whether all of the heat leaves is irrelevant the max amount the radiator can sink will continue to flow out of the cooling system/engine
Your analogy doesn't apply, our bodies generate a massive mount of heat for movement compared to a pump generating little heat.
So yeah an air conditioned room with wind blowing 20mph by you will cool you alot faster than idle air, See Windchill.
The pump cavitation has been misrepresented as "flowing too fast to transfer heat" by mechanics that didn't know any better when they pulled the tstat expecting better results.
Corelation is not causation
1) the flow rate of the coolant will never max out the heat transfer rate.
2) the heat transfer rate from the coolant to the radiator material is limited by the specific heat capacity of the metal or plastic the radiator is made of and the temperature difference, not how fast the fluid is moving thru it
This is what I've been saying. Which also makes your 1 and 2 contradictory. Yeah it can flow faster but when it's past the ability of the radiator it's diminishing returns not negative effects. (it's more than just composition and temperature difference but ok.)
3) no matter how fast ... will be limited by the flow rate
lol
4) My analogy works just fine........never mentioned 20 mph or idle air....just said if you walk thru vs run thru....one makes you feel colder/cooler, and it is not windchill, it is the simple fact that you spent more time in a cool environment, so more time for heat to transfer.
Ok let me know when a continuous flow of water CONTINUOUSLY removing heat is equal to one entity moving through a building once
he amount of heat produced when moving is negligible to the heat that makes you feel hot....unless you've been running a marathon.
body heat takes seconds to increase from running not a marathon. Try it
5) pump cavitation...I never said any of that crap
You didn't no, but I did. It's the real reason behind increased temps at faster speeds miss attributed as too fast to transfer "enough" heat.
Corelation is not causation.
Originally Posted by TRCM
No comment on my real life example.......................