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Engine Break-In

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Old 03-25-2007, 01:59 PM
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Originally Posted by ReggieRaft View Post
You know somebody is going to pull up next to you to see who is faster. Then what do you do? Hit it.
use self control and protect your investment.

then after only 10 hrs its hammer time with no worries cause thats why you have a warranty.
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Old 03-25-2007, 02:21 PM
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Originally Posted by MacGyver View Post
But if you do have an issue, Merc could pull the engine statists from the computer and tell you..."Sorry, the warranty is void because you ran past 3/4 throttle"
Yup.....we had that happen with a pair of 2.5 OFFSHORE Mercury Racing outboards........they pulled out the rule book and ran the scan tool........did they honor the warranty......YES.... but it took some time and lots of dealer/customer pressure on Mercury to do it. It was close but they did warranty it. Follow the the manual and go an extra 2 or 3 hours in good faith if a problem does arise.....but those motors are basically issue free and turn key every time...GO HAVE SOME FUN
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Old 03-25-2007, 05:24 PM
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Correct me if I am wrong here. I know the computer tracks what rpm's the motor has run at. (I was amazed to find out just how much time I have spent in no wake zones.) But I don't think it tells you WHEN those rpms were logged.
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Old 03-25-2007, 06:31 PM
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I can understand 3/4 throttle for the first 2-3 hours......after that! Run it like you normally would if it had 100 hrs on it.

We just built brand new engines and sent them to the dyno....he ran them to near 6,000 rpms and they were just put together!!!
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Old 03-25-2007, 06:34 PM
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Originally Posted by Macklin View Post
Correct me if I am wrong here. I know the computer tracks what rpm's the motor has run at. (I was amazed to find out just how much time I have spent in no wake zones.) But I don't think it tells you WHEN those rpms were logged.
No time record is kept. My post would only be relevant if something happened during the break-in period.
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Old 03-26-2007, 02:46 PM
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Originally Posted by MacGyver View Post
But if you do have an issue, Merc could pull the engine statists from the computer and tell you..."Sorry, the warranty is void because you ran past 3/4 throttle"
I think you are pretty accurate here. This is unconfirmed, but a Mercury rep. at the LA Boat Show told me they can even tell when it was at WOT (I would presume relative to the number of engine hours, rather than the date and time).

Please ignore all the uninformed people who say to just run the engine at full throttle from minute one. They have an extremely small sample size to base their opinions on. I don't know of any "major" engine manufacturer who recommends this, nor do they durability test their own engines without a break-in period.

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Old 03-26-2007, 05:23 PM
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Then how about the issue of Dyno testing. All major engine builders dyno their engines immediately after assembly. Run them hard after minutes of break-in.
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Old 03-26-2007, 05:27 PM
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Kinda more of a question than a reply, but do the ECU's on the 496's (or any other high performance EFI Mercury) not have a break-in mode like the outboards do?

I know on a new 280, the ECU runs in a break-in mode until it has determined the motor has been "broken in"
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Old 03-26-2007, 06:42 PM
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Originally Posted by DORaymond View Post
Then how about the issue of Dyno testing. All major engine builders dyno their engines immediately after assembly. Run them hard after minutes of break-in.
I know the engine builders do this. I would like to hear more thoughts on this one as well.
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Old 03-26-2007, 09:31 PM
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I had a guy whos ecu tracked that 1/2 of the engines short life was pegged at the rev limiters.
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