I agree with genob as a first poke at the issue. Have you run an o2 sensor to see what air fuel ratios you are see at cruise and wot? Lean will heat the oil fast.

i believe he has perminant a/f meters in the boat.i know for sure the engines have piston oiler,s.

And pyro's. He's all stacked up with instrumentation. :smile:

Don't forget the oil smell that tips it off...Right ? If I remember right that's what tipped you off years ago.

Definately a smell I can distinguish too.

Sounds to me like the piston oilers are doing there job. Putting a lot more heat in the oil. Now it's time to step up the rest of the oil system to handle the extra heat. Get a bigger oil cooler. Sometimes you end and up having to run 2 oil coolers. We have motors out there that run oil through not 1 but 2 14plate coolers...

Does that filter head have a provision for a sending unit on it somewhere? If so try wiring one up at that point and compare the 2 engines.Edit- looks like you've tried that.

I Monitor after cooler so I know whats feeding bearings, after a safer tune this win ter on Dyno I am struggling to see 150 AFTER cooler, I am addressing that now, but all last season with mid to high 12's for A/F I saw190-220 after cooler, I changed NOTHING else, so tune can play a huge role, Also Dan is making a little more power now too, I know he went to a smaller 9 plate over the 14's last season because he was cooling too good before, do you still have those 14 plates?

the piston oilers will take heat from the piston and put that heat in the oil.easy fix is bigger oil cooler.a 14 plate cooler will easily do the job on a 950 hp engine imo.

Good memory. I remembered the spring oilers, but not the piston oilers.

Everyone is being so helpful lately. I miss winter with all the bashing and insults. :nicethread: