Mercury Racing blue motors: 500EFI, 525 EFI, 575 SCI. Pros/cons/maintenance/etc.
09-02-2015, 03:26 PM
#51
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I recently posted a question on stainless marine or headers. Then I asked about CMI. At that point the threat went nuts. Everyone hated CMI headers. I was very confused on this as so many people use CMI and love them... I dug deeper into it and found that Merc Racing used CMI Headers after having a ton of engines go south using Gils (reversion problems). Problem is that Merc told CMI what grade stainless to use (lower) and to bypass the heat treating of the finished tubes. So what happened, the headers crack leak water in the engine and if not caught will quickly destroy it in short order. It seems standard CMI's are fine but the Merc/CMI headers really gave CMI a bad rap. Now you can buy the CMI header for around $4000, I believe the inferiour Merc version is $8000. Another example on merc's outragious mark-up. The rockers used in the new blue engines are Scorpion Endurance Marine Rockers, they list for around $400.00 merc price around $800.00. Anyway I'd personally skip the blue motor. Go to Young Performance, Wesco Racing, ect and have a great builder build your engine. It will cost you less and be a MUCH better engine. Do some digging on here about blue motors, you'll be shocked at what you'll read and how Merc didn't stand behind their product.
On another note about Mercury quality. A buddy of mine somehow got water in his oil reseviour in his new 40 hp Merc outboard. It took out the crank, we tore it down to rebuild it and its not possible. Its a throw away engine. The block and the head are welded together? IMO Merc needs to stop letting the bean counters run the show and start letting the engineers focus on long lasting, repairable products.
On another note about Mercury quality. A buddy of mine somehow got water in his oil reseviour in his new 40 hp Merc outboard. It took out the crank, we tore it down to rebuild it and its not possible. Its a throw away engine. The block and the head are welded together? IMO Merc needs to stop letting the bean counters run the show and start letting the engineers focus on long lasting, repairable products.
09-14-2015, 04:41 PM
#52
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Has anyone heard of 500EFI's having pre detonation issues? I have no issues while planing, however, If I try to put the throttle down from the cruise speed I can hear it start to "Ping". Motor has about 190hrs. Running 92 Non-Ethanol.
09-14-2015, 04:57 PM
#53
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Pre ignition or detonation? Pre detonation isn't really a thing. Why are you running 92 octane? Has the ecm been flashed? What plugs?
09-14-2015, 05:05 PM
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Detonation sorry. Running 92 because I figured that's what you're supposed to run. I would say it has been flashed. Due to the fact with the previous prop it would rev to 5500. (only took it there once) then I stuck more prop behind it. Running factory plugs, maybe 3 hrs. on them. The motor seems to run rich at idle as well.
09-14-2015, 05:12 PM
#55
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Where do you get real gas from. In the north east we have the corn hole fuel killing our motors and fuel lines. Thanks hippi liberals for killing my crap as you drive a electric car on a road that I pay for in my fuel that you don't pay for as you smog up the air from the power plants for electric in your clean car! Stupids! Sorry for that outburst. I'm done.
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09-15-2015, 07:52 PM
#58
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They are probably pinging because you should be running 87-89 octane.
