Operating Temp and Auxillary Instrumentation 302

Ha. Probably fixing a leak at the sensor-manifold joint.

**No wires were injured in the filming of this episode**

Still have mixed feelings on the black.

TRBenj wrote: Ha. Probably fixing a leak at the sensor-manifold joint. **No wires were injured in the filming of this episode** Still have mixed feelings on the black.

Don't you dare change the colors

Pete, I was keeping that one in my back pocket but It is kinda a perfect spot for a short formed hose at the front of those risers

Design issue, not Tim's doing

Armchair engineering... Those would hurt more than help... it’s the offset that causes the issue. Straight barbs nearly touch as it is, those angles would require a 260deg loop to connect!

Barbs came preinstalled, blame Dana.

TRBenj wrote: Those would hurt more than help... it’s the offset that causes the issue. Straight barbs nearly touch as it is, those angles would require a 260deg loop to connect! Barbs came preinstalled, blame Dana.

Just run 3 ft of hose from the left manifold to the right riser and another 3 ft the other way

TRBenj wrote: Armchair engineering... Those would hurt more than help... it’s the offset that causes the issue. Straight barbs nearly touch as it is, those angles would require a 260deg loop to connect!

Tim, You need a different armchair

Only 3 weeks in must really be getting cold

Riley wrote: Gosh, what is wrong with the hose in that photo?

Someone else's idea.

You can partially see the oil cooler tucked under the filter and engine mount

I dunno what you guys are talking about up there I can’t read it all … but for the record…

Oil coolers cool the oil, they don’t cool the motor more or less per say just change where the heat is. In the case of the PCM momentary add on system with one pump you only have one stream of water to work with therefore you are adding the heat you remove from the oil to the water that you are then using to cool the block and heads.
In certain low speed/cool water scenarios because the thermostat would be closed and you would be operating on a fixed bypass you would actually be running the water warmer. Theoretically the engine as a system maybe cooled slightly more at this point because of the additional heat exchange area but you would perceive it as running warmer if you are checking only the water temp gauge.

When the thermostat is able to control the system by opening partially because you need less than full cooling capacity you would see the same water temps with or without the cooler, however again the overall engine is cooled more as the oil is cooler that it would be if you didn't have an oil cooler.

When/if you run out of cooling capacity and see water temps above the thermostat controlling temp (which will happen sooner with an oil cooler than without both because you have lowered the flow rate by adding the waterside restriction of the oil cooler and because you are bringing warmer water to the engine cooling passages) – you would have the higher water temp at similar speeds/loads but cooler oil.

You would likely never have cooler water temp than an oil cooler less system. The old Chrysler two pump setups where the oil cooler is not using the same water that cools the block and heads is a bit different scenario.

But Joe doesn’t the cooler oil running through the engine cool it down somewhat… yeah yeah not significantly though-

So oil cooler is only there if you need cooler oil – which sometimes is a good thing, and sometimes can be a bad thing and you still have the pressure drop on the oil side of the cooler to deal with – and the increased pressure that comes with the cooler oil –

All we know for sure is that it won’t ever likely lower the temp of the cooling water temp gauge on a single pump system, I think.

KENO wrote: Well for the record, everything you said has already been said in the stuff that you didn't read

I assumed so, but now that it has been said by an Engineer who has occasionally taught thermodynamics and heat transfer at the (community) college level it can go on the record...

JoeinNY wrote: Oil coolers cool the oil, they don’t cool the motor more or less per say just change where the heat is. In the case of the PCM momentary add on system with one pump you only have one stream of water to work with therefore you are adding the heat you remove from the oil to the water that you are then using to cool the block and heads. In certain low speed/cool water scenarios because the thermostat would be closed and you would be operating on a fixed bypass you would actually be running the water warmer. Theoretically the engine as a system maybe cooled slightly more at this point because of the additional heat exchange area but you would perceive it as running warmer if you are checking only the water temp gauge.

Before the thermostat opens isn't the heat that is removed from the oil and absorbed into the water passing through the cooler lost through the exhaust before it can transfer back into the heads/block? Seems like the heat exchange efficiency in the oil cooler would be significantly higher than water passing through the tstat housing and out the exhaust, but not sure.
This is definitely not the direction I anticipated this thread going, but i enjoy it. I might have a poorly seated t stat that is allowing blowby or some other phenomena going on. But at least now you guys know I have an oil cooler.

Ken my concern is because it is not a small amount of time in my case. It is the entire time I am using the boat until I go 40+ mph for several minutes. When the thermostat is open I don't have a problem. It holds at 160 degrees +/- a few until i back off the throttle, then it drops.

Pete 100-120