Re: New York & The Y2K!!!!
 

;)

Re: New York & The Y2K!!!!
 

Are we talkin' bikini pic money or nude money???

Re: New York & The Y2K!!!!
 

LOL............bikini pics will do for all of us. We're worthy. :)

Re: New York & The Y2K!!!!
 

;)

Re: New York & The Y2K!!!!
 

Oh Yeah..............Now where talkin !!! Beautiful ;)

Re: New York & The Y2K!!!!
 

Pat, Aluminum heads forsure but as for the closed cooling its a waste with this level of engine. My opinion is when you get up above a normal use engine i.e. a warrantied family boat use motor, there is little benefit from the closed cooling. Heres the reasoning:

The whole point of closed cooling is to limit corrosion of engine internals ( the problem is doubly bad with use of dissimilar metals: aluminum head, iron block, copper intercooler etc... ). With a go fast boat and a built engine your looking at something around 450-500 hrs of use before rebuilding tops... anyone who goes for more is either too cheap or not out for performance. That use is about the same as 5 seasons. With proper care an engine will last for 5 seasons with open cooling no problem. Also closed cooling is limited to how big an engine it can manage to cool. And a clean install is really hard to make look good. When mercury came up with closed cooling it made sense for longjevity but the nature of the motors we are using will keep them from lasting long enough to take advantage.

My $.02

Re: New York & The Y2K!!!!
 

I am not sure that I totally agree...
I have had aluminum intakes rot to the point I have thrown them in the trash after two seasons. I do boat in salt but always end in fresh. I sure would not want to see a $2000 set of aluminum head casting go away after 2-3 seasons. For sure if you are not going to have a closed cooling system, have all your aluminum parts hard anodized. Then you may get the 5 years before they rot away; but even still it only takes one chip or scratch to help accelerate the corrosion process... :(
A closed cooling system can also help keep your engine at a more constant temperature which does help with performance as well as longevity. An engine that runs too cold may not get lubricated properly and will not idle well.
Yes, the engine may not look as clean with a heat exchanger and extra plumbing, but there should be no problem getting a large enough exchanger. I've seen 1200HP twin turbo diesels that are closed cooled... :drink:
As for getting 500 hours out of a 600HP/502 before needing a rebuild, good luck with that... An engine that will make more than 1HP per cube will have a pretty big cam shaft. I would guesstimate 200hours before needing new lifters, springs and a valve job. When it's time for the second round of that, the bottom end will need bearings. Hell, I have not had any of my performances boat engines make 500hours without blowing or at least showing a noticeable power loss... :rolleyes:

Re: New York & The Y2K!!!!
 

I totally agree that 500 hrs is way too much to expect, I just didnt want to say what is really the truth for fear of getting ripped apart. I'll be happy to get half that out of an engine. As far as the whole 600/502 thing its not that hard to get with modern tech stuff, The manners of the motor hardly change from say a 450hp version. As far as corrosion goes I thought we were talking internal problems, closed cooling wouldn't help an external scratch or chip... If you were refering to an internal scratch then your engine builder is careless or doesnt know the difference in a marine application. A closed cooling system is only as good as the thermstat spec'd for it as far as keeping the temp consistent... same can be said for an open system. With the exception of trying to set a speed record the outside water temp. will effect most boats minimally if at all... Hell Havasu varies almost 30 degrees and I dont know a soul who changes anything in there set up for it. Merc put a **** load of R&D into there system for the 525 and made it work but couldn't for the bigger engines... so far ( Rumor has it they may try and do it on the 600 this year). Tom can probably chime in with some more pros and cons as to why to go one way or the other. I would rather save the weight of a system and cost, and just flush the motor after use. Just thought of another reason CC can be a problem... if you run a 2 or 3 stage seawater pump, Plumbing in CC would be anti-productive.

You thinking of converting over Pat? Whats the application?

Re: New York & The Y2K!!!!
 

My Basically stock 502MagMPI idles at 600rpm, a Merc 525 idles at 850, your 600 probably will idle around the same 850 which is still not bad. But not quite the same manners around the dock.
I still say a closed cooled engine will have the most consistent temp throughout and engine over any open system. Don't be fooled by what the water temp gage reads. Oil temperature is what really matters. Engines that are raw water cooled can have hot spots and cold spots thermostat or not... :drink:
I am quite sure the Merc. 600 is a closed cool engine I saw Superbabi twice. Gary you out there?
No, I'm not adding closed cooling to my engine. She's a 1997 that I bought for $800. Then I spent another $1500 or so rebuilding it my self... :D
If I do build an engine with aluminum heads some day, I'm not sure if I would add CC. If I was spending 25K on and engine with aluminum heads and intake, I would, without question... :cool:

Re: New York & The Y2K!!!!
 

I could make this very long but. On my American Offshore cat i ran a 700hp ProCharged modified 454. In the spring with the cold water I always had soo much codensation in the valve covers it was scary. I know it wasn't good. I could have used a thermostat but I need 140 deg because of the boost I had. So I lived with it until the water warmed up and I was consistant at 140.
Huntington, I don't know what engines you have had but when I opened up my engine on that boat after 200 hrs which was in the ocean once, I discovered the heads where not reusable. I would rather spend the $1000 now instead of $2500 later. And I was takin a chance on the block when I put the new heads on. Deck suface was also pitted bad.