500efi's
#11
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Join Date: Apr 2009
Location: Denmark and hopefully some place nice
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Can someone explain why @ 3-400 hrs. these motors need rebuilding? Lets say that you drove the boat at WOT (5000rpms) for that 400 hrs that would still only be around 24,000 miles on a car. I have built a couple of hi-perf motors before, I just don't get the low hour rebuilds.
Don't even consider this comparison! Boat and car engines, as mentioned earlier, are two very different things in every way. 300-400 hrs is about the limit on any high performance motor of this kind. Some say 10x the hours, but it even be more. Mercs blue motors need rebuilds, as any other high perf. motor, that's how it is. Not exactly sure why you are asking this question? Nothing rude meant, just curious. If you want to go blue, it'll be something you'll need to put money into over time.
Good luck with the new boat
Last edited by A.O. Razor; 03-31-2012 at 03:47 PM.
#12
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thanks for all the info. and the reason i am asking is because i am spending 55k on the boat now so i was hopein what i was hearing about the hours time frame was off a bit. i love the motors and dont mind getting it done was just hoping it wouldnt be in the first season with the boat.....
#13
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This would be my concern as well. And if you're going to go through the hassle of pulling the heads you might as well do a valve job. Then you'll be good for a long time.
#17
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Join Date: Sep 2010
Location: Clear Water Beach Florida
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If compression is strong, I would run it through the summer and consider the top end rebuild a winter project. I ran my last 500 efi to 410 hrs with no problems. I don't run wot for more than a minute or two .
#18
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here i am with another question. the boat i am getting has the 500 efi's with bravo x drives. are those drives going to hold up or should i start saving for xr's?
#20
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Join Date: Sep 2011
Location: St. Louis, MO
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thanks for all the info. and the reason i am asking is because i am spending 55k on the boat now so i was hopein what i was hearing about the hours time frame was off a bit. i love the motors and dont mind getting it done was just hoping it wouldnt be in the first season with the boat.....