Oh yeah , hey Duncan, how's the new boat going?.

The white substance is just the coagulation of water emulsified in oil thats being carried up to the top of the motor by its breather system where it condenses because the valve covers are some much cooler than the rest of the motor. When I started running my 525, it would collect around the breather and oil fill ports. I had anticipated this and installed one of Mercs oil filter/thermostat kits on the motor before install, ie. no water in the oil, just the white stuff where the engine was cooler. Installed one of Moroso's flow restricer plates in the water outlet to raise blocked temp. and that got rid of the white stuff. Just don't like restricting flow to the Gills, so I hope to reinstall a thermostat and seawater bypass by next summer. A warmer cumbustion chamber should increase engine efficiency and therefore increase power, plus get rid of any condensation problems.

My Scarab blower motor did the same thing, no thernostat.

My race car has a restristor in it and it still does it.same milky stuff on the bottom of the valve cover .

the hustler came with the KE oil therostats . This is the First time I have took the valve cover off . no moister

pick on the stand ,eveything disconected

Guys, before I did the thermostatically controlled oil cooler , I got 1 season out of the heads..(valves etc.) The milkshake has to go..... My oil temp worried me running at 210 and 220+ when wot... My water temp was 100 - 110..... I found that blower motors are an art, not a science...We initially had temp problems because we were getting a lot of water in and not getting it out. Once they installed water dumps out of the rear of the intake, she ran acceptably... I wouldn't do it again......Although I ahve thought about a whipple on my 525..... Reason must win out..... Good Luck !!!!!

Hey Bo.... Monsta.... Thanks for asking ,the Fountain is great, but as we all know...
You can never go fast enough... and there is always a faster boat then yours....
It all comes down to your wallet!!!!!!

Bo Write us on the Fountain thread.. Let us know how you are doing.....

One other thing....

Skip from MRD says the oil temp sender should be where the oil leaves the engine at its hottest.... Not after it leaves the cooler...


Heat Kills !!!!!!!!!!!!!!!!!

Thanks for all your input.

I forgot to mention that this engine ran oil temps over 200 f . The other one does not run as high and does not have the grease. Just a little condensation as I've seen on other naturally aspirated engines.

Someone mentioned this being more of an art than a science. I agree. It seems that there is a fine line in holding the water in the block to get some heat built up, having the right amount of water pressure, and having just enough oil temp to burn off condensation.

I'll probably do a lot of research on oil thermostats this winter.

It sound like the "white grease" is a product of Synthetic oil and too much condensation. I think I'll pull the Intake this winter just to make sure, and go from there.

Thanks again for all your help,

Bob