4.6L Stroker Cooling
04-18-2023, 09:52 AM
#61
::CF Administrator::
The stock Radiator is 1 row of and others are 2 row Radiators so if you think about it the coolant in a 1 row radiator will pass though faster then a 2 row because there are 2 times more tubes for the coolant to go though and yes the 2nd row of tubes will get hotter air because the 1st row heats it up , so you do need good air flow so hood vents will help the air flow . so there is a lot to look at when looking at how hot your engine runs and when it runs hot .
It's all about coolant flow and air flow. The engineers who built these things were pretty smart.
Indeed.
05-23-2023, 09:59 AM
#63
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Hey folks, new here but was following this thread for a while. I also have a golen 4.6 + alot of extra weight and lift. Above GVWR without towing for sure.
Temp reading results, each taking the same 8% grade for several miles at 65mph. The hill is about 8 miles from my house with some rolling grades leading up to it. Ambient temp was about 75 degrees.
Temp measured at crest of big hill. I also tested with a 1/2" restrictor in the upper hose to see if the flow was too high, and interestingly it did help in a couple scenarios.
With 1/2" flow restrictor in upper hose:
Mishimoto + 160 tstat = 230'
Mishimoto + 195 tstat = 220'
Stock + 195 tstat = 210'
No flow restrictor:
Mishimoto + 160 tstat = hit 220' before I even got to the hill, aborted
Mishimoto + 195 tstat = 215'
Stock + 195 tstat = 197' <----!!!
Still getting hot (up to 225) in 95 degree ambient desert sand. I am still running the heisco t-stat housing and pump, and a ZJ clutch...so not completely stock. May try OEM versions and report back at some point.
Temp reading results, each taking the same 8% grade for several miles at 65mph. The hill is about 8 miles from my house with some rolling grades leading up to it. Ambient temp was about 75 degrees.
Temp measured at crest of big hill. I also tested with a 1/2" restrictor in the upper hose to see if the flow was too high, and interestingly it did help in a couple scenarios.
With 1/2" flow restrictor in upper hose:
Mishimoto + 160 tstat = 230'
Mishimoto + 195 tstat = 220'
Stock + 195 tstat = 210'
No flow restrictor:
Mishimoto + 160 tstat = hit 220' before I even got to the hill, aborted
Mishimoto + 195 tstat = 215'
Stock + 195 tstat = 197' <----!!!
Still getting hot (up to 225) in 95 degree ambient desert sand. I am still running the heisco t-stat housing and pump, and a ZJ clutch...so not completely stock. May try OEM versions and report back at some point.
After a burping session and several heat cycles, I took it on a test drive. Immediately I started getting higher temps, up to 220 degrees just merging uphill onto the freeway. I put the stock rad back in and it's back to the normal 195-200 temps.
I have a hunch that there may be air-flow issues specific to my XJ at higher speeds. The temps do not rise in stop and go and come back down when I exit the freeway. But either way, the stock radiator still outperforms everything I've tried so far, by alot.
Last edited by djamps; 05-23-2023 at 10:06 AM.
06-29-2023, 07:35 PM
#65
Seasoned Member
Thread Starter
I’ve been in the mountain west with the stroker — southern Idaho, Utah, Colorado. All three areas get into the mid-90s.
Last edited by WillyXJ; 06-30-2023 at 10:35 PM.
06-30-2023, 09:28 PM
#66
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Join Date: Aug 2018
Location: Idaho
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Year: 89
Model: Cherokee (XJ)
Engine: Peddles
Put a second temp sensor on head somewhere or i guess even probe tge radiator you should then be able to monitor thermostat.
I think youve put 2 tstats on in this thread. This may not be enough tstat count to get a good one that works properly installed.
I think youve put 2 tstats on in this thread. This may not be enough tstat count to get a good one that works properly installed.
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