Nice to hear, like that you will most probably not have the problems I had.
Oil cooler on an H?
- Thread starter RufusTheDufus
- Start date
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I think I should have asked you here and not on my own thread 
What is the brand of the sandwich you have, the one with the thermostat?
Where did you buy it?
What is the brand of the sandwich you have, the one with the thermostat?
Where did you buy it?
- Thread starter
- #23
I forget the brand. There are lots of them out there. Maybe Moroso? I bought it from jegs.com.
Just search Google for 'Thermostatic Engine Oil Sandwich Adapter' or some combination of those words. I think it cost about $70US.
I could actually see the point at which it started opening when watching my mechanical oil pressure gauge. It would open and close depending on engine load. There would be a 8 - 10 psi drop in oil pressure at the gauge when the thermostatic valve opened. I attribute this to the long length of rubber hose to get the oil routed to the cooler in front of the radiator.
Just search Google for 'Thermostatic Engine Oil Sandwich Adapter' or some combination of those words. I think it cost about $70US.
I could actually see the point at which it started opening when watching my mechanical oil pressure gauge. It would open and close depending on engine load. There would be a 8 - 10 psi drop in oil pressure at the gauge when the thermostatic valve opened. I attribute this to the long length of rubber hose to get the oil routed to the cooler in front of the radiator.
- Thread starter
- #25
It will drop from 60 to 50-52 PSI, as an example. The old H has a very high pressure oiling system.
my 2H have that pressure only when cold .. ( cold engine ) but it will drop around 20 when hot ( thanks to my heavy foot ) and then 12 PSI or so will not make me happy ..
- Thread starter
- #27
Cold starts in the winter would sometimes see oil pressure as high as 80 psi using 15w40 non-synthetic. This is even after cleaning up the oil bypass pressure relief valve.
Some people with the H have mentioned that when that relief valve sticks the oil pump can generate enough pressure to pop the stock canister oil filter.
Some people with the H have mentioned that when that relief valve sticks the oil pump can generate enough pressure to pop the stock canister oil filter.
I understood that the thermostatic valve on the sandwich would open depending on temperature.
What do you mean by " It would open and close depending on engine load"?
Does it depend on both, temperature and load
If yes could you explain what combinations of TempXLoad would open or close the bypass valve?
I'm asking as maybe for the summer I might put my oil radiator back but don't want to have the same issues I had with the "always full flow" sandwich I have now.
Thanks
What do you mean by " It would open and close depending on engine load"?
Does it depend on both, temperature and load
If yes could you explain what combinations of TempXLoad would open or close the bypass valve?
I'm asking as maybe for the summer I might put my oil radiator back but don't want to have the same issues I had with the "always full flow" sandwich I have now.
Thanks
I understood that the thermostatic valve on the sandwich would open depending on temperature.
What do you mean by " It would open and close depending on engine load"?
Does it depend on both, temperature and load
If yes could you explain what combinations of TempXLoad would open or close the bypass valve?
I'm asking as maybe for the summer I might put my oil radiator back but don't want to have the same issues I had with the "always full flow" sandwich I have now.
Thanks
I imagine he meant that when you load the engine more the oil gets warmer -> thermostat opens...
- Thread starter
- #30
Yep, if the engine is working hard the oil would heat up enough that the valve would open. It would almost never open driving along on our country roads here in the woods. But pull a long hill with 10 psi of boost and it will open up.
It was interesting to see when it would and wouldn't open. I assumed oil temp would follow engine water temp fairly closely. That isn't necessarily the case. There's a lot of oil in these engines. The H runs high pressure and I assume a much lower volume than modern engines. So the oil temp responds to changes in engine load at a slower rate than the coolant. I don't have an oil temp gauge so I don't have any data to share.
My whole motivation for the oil cooler was because I added a turbo. I'm switching to a 3B since the H is a POS and I'm not keeping the oil adapter. (I sold it already.)
It was interesting to see when it would and wouldn't open. I assumed oil temp would follow engine water temp fairly closely. That isn't necessarily the case. There's a lot of oil in these engines. The H runs high pressure and I assume a much lower volume than modern engines. So the oil temp responds to changes in engine load at a slower rate than the coolant. I don't have an oil temp gauge so I don't have any data to share.
My whole motivation for the oil cooler was because I added a turbo. I'm switching to a 3B since the H is a POS and I'm not keeping the oil adapter. (I sold it already.)
not H engine but I do have an engine oil temp gauge in my 1HD-T and it reacts much more faster than coolant temp ( due t-stat in the cooling system I guess ).
as we are close to hell down here .. I can see oil temps as high as 140°F but it's awesome how fast it cools down if it's raining ..
Another factor that raise oil temp pretty fast to me .. it's AC .. ( which it's almost always on )
as we are close to hell down here .. I can see oil temps as high as 140°F but it's awesome how fast it cools down if it's raining ..
Another factor that raise oil temp pretty fast to me .. it's AC .. ( which it's almost always on )
It's good to know about the behavior of your extra oil cooling system, I might one day buy one of those thermostat sandwiches and your experience will be really helpful.
I have a 3B on my truck and I like it a lot. I can't compare to anything else as this is my first Land Cruiser but I think you will be happy with one of those.