GM retiree just joined

[DieselCash]

I have been wanting to remove my oil cooler in front of the radiator. This is the main reason I have not replaced my leaky oil cooler lines. I want to install a Derale 15800 electric-cool remote cooler under the truck between the frame and transmission. I have severe heat build up issues when I tow here in the Texas heat. I watch all my gauges like a hawk and if I see a problem slow down our stop. Maybe one day my adventures can start on this.

 

[schiker]

Oil temp is one I think there is room for improvement. I don't know but wonder if the stock parallel plate cooler allows oil to take the path of least resistance and not all rows cool especially as the oil cooler ages and gets thick sooty oil in upper rows. And I wonder how the oil warms and flows differently across rows in cold weather warming up etc. I'd like to see a big plate cooler with multiple real "switch backs" or passes.

The cooler is not thermostatically controlled and has a bypass valve which is a similar to the oil filter bypass valve. On initial flow it should create a 15 - 18 psi differential across the valve and cooler. (that is about how much pressure it should take to crack open the oil filter bypass iirc I measured the force to compress the spring and area of the piston face and did a simple calculation to approximate).

Since liquid is not compressible once oil pressure builds due to down stream most significant restriction (bearing clearance) the whole oil path pretty much has the same pressure from what I have seen people post.

I am not sure what really happens though it should maintain a max differential of 15-18 psi. Pressure comes from restriction to flow. The pump can make something like 80-90 psi pressure max then relieves but that is only if the oil is cold or you are revving the engine up to make the flow to make the pressure.

I wonder what really happens once the oil is warm and you are idling ~700 rpm with flowrate to build ~10-20? psi and accelerate to 3000 rpm then back to 2000 rpm and create 30-40? psi on system along the way. Seems it crosses this 15-18 psi differential pressure along the way and I wonder if the flow surge doesn't for a brief time bypass then suppose to "relock" ?????

Pressure is only one indicator of flow so I kinda just spin my wheels since I have never seen flowrate of oil pump reported.

I read some along time ago how marine engine builders would increase the oil filter bypass valves pressure differential for remote mount oil filters. GM kept upping the oil cooler line size I guess/assume to reduce restriction and increase flow through cooler. I have often wondered about a need for increasing the cooler bypass pressure and how much better a true thermostatic valve would be coupled with a stout bypass valve.

 

[SnowDrift]

billyg,

Have you gotten into the detains of 100hp in the heads in this forum? I haven't seen it in a search, but could have easily missed it.