SDF,

Thanks for your effort to provide the diagram. Unfortunately the reduced size file that OSO accepted was illegible on my end when I printed it. I will PM you my email address. Please send the better resolution file to me there if you would. Thanks

Rage:

Thank you for re-confirming that. The Melling HD/HV is the only pump we use and sell so oil pump volume you should have should not be the problem from an oil pump issue.
Just to let you know we have a couple of customers running 750-800HP Whipple supercharged 496's that we built with thermostat oil cooler systems with coolers similar in size as yours and one is run at Havasu in over 110 degree temps for over three years now with lots of long distance and long duration blasts at 5000rpms and higher with no oil overheating issues so I know its quite doable and possible when everything is right. I stll believe your issue may be plumbing, routing or compnent issues in your oil filter and cooler system and not bearing clearances.
JMO

Best Regards,
Ray @ Raylar

I agree but he won't post any pictures of the plumbing etc so someone else can see what he is seeing.

Pretty much a good stopping point until the engine comes out or someone else looks at it with another set of eyes preferably in person and not on the internet.

Then again, he wants to run wide open for at least 15 minutes. Everything has a limit. That's why I recommended buying a bone stock engine like the 525. It's made to run open all the time Just like the 500 EFI. But you can't hop those engines up to something more and run it the same as the way it was meant to run in the stock class race boats.. There is a TON of R&D that Merc puts into that kind of stuff.

Makes no sense to find another oil pan if it won't work on the block. Makes no sense to keep talking about it when there will be no engine removal very soon.

Go ride in the boat and have some fun. It will never be perfect. If you don't run it wide open for 15 minutes it may last longer and save some money.

The sure-fire way to settle it is to take the boat to a real mechanic and drop it off with an agreed budget (if applicable). They'll call you when it's right.

PS I'll send the larger version of the pdf asap.

The only way I have ever been able to run WOT as long as l wanted was when I did not run oil tsats (like kidnova suggested). The fact of the matter is the longer you run wot the more heat is built on a high perf engine. The only way to keep it under high level danger levels is to start with real cool temps like 140f or so. Then you have 100f to go in wot running just to get to 200f. If you run a 200f stat you only get 30f before danger. That's my experience on that. Or like sd says above, a low hp engine can do the same. For instance if rage were to put a 2 bbl carb on his engines he could probably run on wot all day and never have oil temp issues. The only other way would be with seriously large oil coolers. I think rage is asking too much out of his current system and there is nothing fundementally wrong with the build.

See above in red. Thanks.

Please see above in red

We don't stock or use the 11 psi bypass vales, so I doubt it.

I prefer to look at your problem and solution in a simple three step investigation process.

One, take some pictures of your oil filter cooler system plumbing, fittings and parts and post those here or in PM so another set of eyes can review and see if there are any obvious or identifiable obvious possible issues or furthur questions.

Two, lay out a simple way to by-pass the thermostat for full oil flow not routing thru the oil thermostat.

Three if these don't find any causes or improvements, then the engine should come out and check by-passes for problems or to low pressure opening settings. Take pan off and look at clearances and conditions of bearings, etc.

I think the time, expense and difficulty of trying to come up with a possible over engineered bandaid solution like a crankcase cooler is impracticle and somewhat misguided.

Obviously there may be some days before you can get your Rage on the water and run these 15 minute WOT blasts, so there seems to be plenty of time to come up for yourself with a staged simple plan.

JMO,

Best Regards,
Ray @ Raylar

Thanks Ray I appreciate your honest input.

Bill

Not if its been covered but just throwing it out there...

http://www.offshoreonly.com/forums/g...-vi-502-a.html


post #26

10 qts is the spec. I tried 9 qts but no difference in crankcase oil temp.