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Old 10-16-2015, 02:26 PM   #15
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....when I installed the 502, iI went with the 160 thermostat again. My temps now run way too cool, around 100 degrees with occasional trips up to 160. I installed a complete new oil cooling system (with no oil temp thermostat) a Banks powerpack and the right inner fender along with the 502. Not sure if any one item, or a combination of all caused my dramatically lower temps. Probably none of you with high temps want to hear this, but I will be making some changes to get mine to run hotter. Hopefully just a thermostat change but if necessary; I will add a temperature controlled bypass for the oil cooler.
This is way too counterintuitive for me.
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Old 10-16-2015, 03:42 PM   #16
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I love posting pics of my rig! Proud papa
Damn Richard, your Rig is looking fine, I may just copy that dark color going beyond those windows. Makes it look like some real cool Limo.
And congrats on your successful trip after doing all those incredible upgrades.
Going East soon?
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Old 10-16-2015, 03:45 PM   #17
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I do not have any personal experience with the MH, but I was involved form a MFR standpoint 20 years ago. I specifically recall the absolute need for inner fender closeouts for both sides. When they are open there is a lot of turbulence in that area which prohibits a flow of hot air out of the engine bay. You want a smooth stream of air from the grille opening, back and down and out through the rear. Having no inner fender closeout "balls up" all the hot air and leads to overheating and fuel boiling issues....especially on carbureted models.
Now there is a perfect example of my cluelessness
Thanks for posting that info!
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Old 10-16-2015, 03:56 PM   #18
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I am guessing that most of my low temp issue is due to the new oil cooler. It is bigger than the original and is fed through bigger lines. The old one was fed through an adapter on the oil filter base. The 502 has factory oil cooler ports in the block. The old adapter was GM part #326098. I have not been able to determine if it included a thermostatic bypass. The new setup does not have a bypass.


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Old 10-16-2015, 06:25 PM   #19
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I am guessing that most of my low temp issue is due to the new oil cooler. It is bigger than the original and is fed through bigger lines. The old one was fed through an adapter on the oil filter base. The 502 has factory oil cooler ports in the block. The old adapter was GM part #326098. I have not been able to determine if it included a thermostatic bypass. The new setup does not have a bypass.


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I can be clueless too, in fact I am getting more proficient at it: is your 502 the same as the Workhorse 8.1?
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Old 10-16-2015, 07:17 PM   #20
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No, the 8.1 is a different block than the 502. The 8.1 is a "tall deck" with a longer stroke than the 502.


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Old 10-16-2015, 07:45 PM   #21
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No, the 8.1 is a different block than the 502. The 8.1 is a "tall deck" with a longer stroke than the 502.


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Interesting. So does the 502 not burn more gas than the 454? I presume we're talking TBI for fuel atomization though.
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Old 10-16-2015, 08:36 PM   #22
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I have a Holley 850 carb. I have been on one shakedown cruise and one weekend camping trip since I installed the 502. My initial impression is that my fuel mileage has improved. I never calculated it with the 454 so I can't make a real accurate assessment. I've always felt that if you are worried about fuel mileage you should probably find another hobby.
I think the 502 is not working as hard as the 454 was so that may explain my perceived increase in economy.
I certainly never expected it to run so much cooler.


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Old 10-16-2015, 09:22 PM   #23
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Too hot?

For what it's worth
When I receieved my 345 last year it would 200 - 220
I did a little research and had people on the internet say that 200 - 210 is normal and good for a 454 "they like to run hot" seemed to be the answer, but I just could end stomach it so I did a simple flush (not removing the radiator)
I replaced the 190 thermostat with a 160 then ran just water and a product called water wetter. Now my temps seem to run cooler 180 - 200. BUT I live north (Chicago Area) and I will flush again and install antifreeze very soon!
Here's another thing... The temp sensor on the 454 is in the head I since have installed another gauge with its sensor in the upper radiator hose
Just today running down the highway the temp difference between the two pretty great at one point the head temp was 200 and the upper hose one was 180
Also for what it's worth I also installed a engine oil temp it was reading 200 - 210 today (it was however a PERFECT travel day sunny and 60*)
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Old 10-16-2015, 10:40 PM   #24
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Just my 2 cents

83 Isuzu, no dash air due to compressor seized and disconnected, with interior heater cored bypassed runs a steady as a rock 180 degrees in up to 95 F.

Recent trip in much cooler temps with heater core bypass open, saw temps 165-170 for much of the trip on highway, into the hills and on the diesel, close to, but not quite 180.

Cheers
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Old 10-17-2015, 08:22 AM   #25
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WOW ! Chiefair. Only 100 degrees indicated temp would cause me to doubt the gauge. Have you confirmed those temps? Those hand held laser thermometers are usefull.
Hell, I mean in Phoenix up until a few days ago you'd get 100 degrees before starting the engine.

Interesting to hear that the cooling water additives are so effective .

It seems clear to me that managing airflow thru the engine compartment is crucial to proper cooling in our classic coaches. I had read here about the importance of the air dams , so that's why I replaced mine.
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Old 10-17-2015, 08:24 AM   #26
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I lost the previous text two times when trying to add pics. So here it is in the making and fitting stage.
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Old 10-17-2015, 08:27 AM   #27
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And installed.
Also replaced the dams at the bottom of the radiator.
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Old 10-17-2015, 08:29 AM   #28
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Better pic
Having the new dam in place totally blocks any view of the front of the engine. But is somewhat removable for access.
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