Yep your right Benny. My mind was wandering.

 

Mine does it ALL the Time

Just like "Differential" the word I missed few posts Back

One word made all the Diffrence in the world

 

Even blocked I don't think it would STarve

In theory it shouldn't

It will take Multiple Failures to Create a Starved situation

 

Benny, so you think they added that bypass to keep the pressure in the cooler down when the oil is cold? And it had nothing to do with potentially starving the engine for oil during high demand?

If so, you could be right. If your correct, then our volunteer just blows his oil cooler. What a way to take one for the team.

 

I don't see anyone Doing that Test LOL

Im thinking if the Bypass Opens the Pressure Equalizes Fast and should Close Back up

Im thinking All the Bypasses are is if there is a Pluggage there is an Alternate Path so it Won't starve or that was the Intention


But Say you Punch it WOT Im thinking the Bypass opens a split second or two until stabilized or Really within the 20-25 psi Differential On each side of the bypass.

I'm thinking that's what we see when you Watch EOT and Go WOT for a Few and 2-3 seconds Later you see EOT Jump 2*-3*F Higher then it was before you Punched it ALL your seeing is Oil that Bypassed that Oil Cooler. Certainly the Oil didn't make a Full Loop and was heat soaked oil your Looking At it not flowing that Fast

Any WOT Oil Cooler Test for efficiency is a Bust From this point on IMO

Wonder what 6 Digit a Year Salery FORD Guy wrote the WOT Oil Cooler Efficiancy Test that Pointless

 

Benny, you just posted you think there are two reasons for the bypass valve. I don't think it has anything to do with potential oil side cooler blockage. I think the bypass valve opens at WOT to prevent starving the systems for oil. I think it closes pretty quickly. I'd almost bet a tank of diesel that the bypass valve didn't exist on some test engines.

Also agreed on the WOT test on oil coolers.

 

Well I see it Opening for 2 Reasons "Pluggage" or "Pressure Equalization" wih the Final Goal being Starvation prevention

Now which one of the reasons it was designed for IDK

I assume Pluggage so if there is a Problem the Truck could possibly Limp to Help instead of being stranded

But I have No Idea to be Honest

 

Well, that's two of us. I just don't think an engine designer would plan for an oil cooler plugging on the oil side. That would be really #@@#$%?+ up engine oil.

 

They Certainly didnt Plan for the Coolant side to Plug in that Oil Cooler

Its Scary to think about All the info here that All of us Scrutinize so close Any Flaw will be found in time

Works Great for Us the Consumer

But the Ford Engineer cant like it much anything he Missed will be Found

I can just see the engineer say well I told them About that Problem and they said it wasn't cost effective to do When in reality he Missed it

 

The oil pump is positive displacement, it will build pressure. The relief valve protects the cooler from cold or congealed oil restricting the flow and building enough pressure to burst the cooler or any other weak link upstream.
The water pump is not positive displacement and will not build pressure. Coolant pressure is controlled by heat or air pressure pre charge.

 

So after reading this entire thread I have one question: has anyone proved the theory that an engine running high EOT deltas due to a weak bypass valve can run correct/better EOT deltas by blocking the bypass valve?

 

Yeah this ^^^^!!

I would love to know if anyone has proven this......

 

How do you plan to block the bypass?

Josh

 

you would have to modify a oil filter base to accept a plug and then find a 6.0L on its last leg and test it out. lol

 

Unfortunately that isn't convenient.

Does make me wonder when back in the day a guy would replace a cooler, end up with high temps again, blame casting sand or some other voodoo, replace with another cooler and be right back again with high temps.

Then the guy disappears from the forum when all along he may have had a bad bypass valve.

D'Oh!

We know better now

But, all things considered if one has a high temp spread, replaces the oil cooler and knows they did a pretty good job during the flush... and ends up they still have high temps, it just might be the bypass.

Josh