Can you really regulate oil temp?
06-20-2023 | 09:59 AM
#42
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From: West Michigan
06-20-2023 | 10:05 PM
#45
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I bypassed the thermostat on the port engine and the temp never even got to 210 degrees so I'm confident the coolers are working. Most of the day was below the 190 degree mark. If just idling for a while it barely cleared the 140 degree mark. I had my wife with me for a fathers day cruise so no WOT stuff but we did cruise the river at 3500 for a while and out on Lake Michigan I was running at the slowest speed I could and stay on plane which turns out to be about 2200 rpm. Anyway, I do need a thermostat and these are the choices.
FSM-185 185ºF (85ºC) 180ºF (82ºC) FULLY OPEN AT 203ºF (95ºC) Engine Oil (Street & Strip)
FSM-205 205ºF (96ºC) 200ºF (93ºC) FULLY OPEN AT 221ºF (105ºC) Engine Oil (Street & Strip)
It's the "fully open" number I failed to notice when I ordered the 215 degree thermostat's I have. They fully open at 233 degrees.
These all have the same housing so I plan on just buying the rebuild kit in the temperature I want. I am leaning towards the FSM-185. Any thoughts or reasons to go with the other? Thanks for your help.
This picture shows the warmest reading all day and this was after a decent amount of time at 3500 rpm.
Just an observation that I had completely backwards. We stopped while on the lake (idling in neutral) to test the water (still very cold) and the port engine with the cooler oil temps had steam out of the exhaust. I always thought that the steam was from the hotter engines. Both engines were running the same water temp all day.
Again, thanks for reading and your input.
FSM-185 185ºF (85ºC) 180ºF (82ºC) FULLY OPEN AT 203ºF (95ºC) Engine Oil (Street & Strip)
FSM-205 205ºF (96ºC) 200ºF (93ºC) FULLY OPEN AT 221ºF (105ºC) Engine Oil (Street & Strip)
It's the "fully open" number I failed to notice when I ordered the 215 degree thermostat's I have. They fully open at 233 degrees.
These all have the same housing so I plan on just buying the rebuild kit in the temperature I want. I am leaning towards the FSM-185. Any thoughts or reasons to go with the other? Thanks for your help.
This picture shows the warmest reading all day and this was after a decent amount of time at 3500 rpm.
Just an observation that I had completely backwards. We stopped while on the lake (idling in neutral) to test the water (still very cold) and the port engine with the cooler oil temps had steam out of the exhaust. I always thought that the steam was from the hotter engines. Both engines were running the same water temp all day.
Again, thanks for reading and your input.
06-21-2023 | 06:08 AM
#46
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From: West Michigan
underpsi68, I don't understand how you came to that conclusion??? The coolers are oversized for my application and they kept the oil temp down (too far down) without the thermostat involved. Swapping the thermostat internals to lower temp may in fact NOT help my situation but I won't know till I try. It could be that I will not be able to control the temp because of the "street car internal tolerances" of my engines. I'm not sure to what degree those tolerances affect the oil temp and maybe it will gradually reduce after they break in some more. I do appreciate everyone's input.
06-21-2023 | 06:38 AM
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underpsi68, I don't understand how you came to that conclusion??? The coolers are oversized for my application and they kept the oil temp down (too far down) without the thermostat involved. Swapping the thermostat internals to lower temp may in fact NOT help my situation but I won't know till I try. It could be that I will not be able to control the temp because of the "street car internal tolerances" of my engines. I'm not sure to what degree those tolerances affect the oil temp and maybe it will gradually reduce after they break in some more. I do appreciate everyone's input.
There is a problem with the thermostat or lines. Not the coolers.
06-21-2023 | 06:41 AM
#48
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From: West Michigan
underpsi68 I'm not going to lie, you put me in a whole new direction of panic. Thanks for clearing that up.
06-21-2023 | 08:30 PM
#49
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From: Grand Rapids, MI
I like the left gauge without the thermostat. If you look at a temp vs evaporation rate graph, you will not see at the holy grail 212°F, all he// breaking loose and the water magically evaporates faster. The most dramatic curve on a graph shows that between 180°F and 212°F some "excitement" is happening. And after 212°F it appears the graph goes more linear. S#it I can't get my damn ice cubes to stop evaporating (sublimating) in my freezer!
You cooler and system is fine...
JMO
You cooler and system is fine...
JMO
06-21-2023 | 10:50 PM
#50
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From: Chicago
You don`t need 212* to "evaporate moisture" not sure why that`s still going around.
That`s the boiling point of water but theres evaporation way before that.
That`s the boiling point of water but theres evaporation way before that.
Last edited by ICDEDPPL; 06-22-2023 at 07:34 PM.
