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what is the difference between 500 efi and 525 efi

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Old 10-02-2008, 03:53 PM
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I knew something like this was going to be in the first replies and I STILL laughed.

Yea, that was pretty funny.
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Old 10-02-2008, 04:16 PM
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Yea, that was pretty funny.
.....What can I say??
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Old 10-02-2008, 04:40 PM
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The 525 has all forged internals and a full roller valve train. It's a very stout package and only pumping 8.25:1 compression ratio, it's hardly working. Plus it run's on Regular 87 octane gas (Mercury Recommended)

I think the header issue has only come into play in saltwater useage. I know of several freshwater 525's that are still operating trouble free.
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Old 10-02-2008, 06:35 PM
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I have 300 hrs on my 02 500 EFI s in my Top gun, trouble free so far 82mph on my GPS
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Old 10-02-2008, 06:52 PM
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Ask the racer's that run the 525 in OSS SVL, they will tell you it is a great motor package. some of the team are running the same motor for the 4th season, with just oil changes and plugs.
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Old 10-02-2008, 08:00 PM
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Originally Posted by Gladhe8er View Post
Both motors should get a top-end job around 200-250 hours.


When you say rebuild top end at these hrs is that for the guys who are running WOT and pushing all the time? I know so many that have exceeded these hrs and have not touched a thing and they keep on ticking....
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Old 10-02-2008, 08:30 PM
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Both are great motors but personally I like the 500 because you don't have all the problems with sensors sending it into gaurdian mode. It is VERY easy and only requires a few minor changes to get a lot more power out of the 500 then what the 525 makes.

Heads, Cam and ECU reprogram and you are at 600 HP and it looks stock and idles like a stock motor.

I have seen a few motors have top end problems at or around 200 hours but very few. I know of several 500's with many more hours that have been trouble free. A mercury tech at the miami show told me that most if taken care of will easiely do 400 to 500 hours.
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Old 10-02-2008, 09:21 PM
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Quote:
Originally Posted by IM4A2Z View Post
The 525 has all forged internals and a full roller valve train. It's a very stout package and only pumping 8.25:1 compression ratio, it's hardly working. Plus it run's on Regular 87 octane gas (Mercury Recommended)
The comp ratio is 8.75 on the 525EFI and 500EFI. The 500EFI aslo has all forged internals and a full roller valve train and runs on 87 octane.

The main differences are the cam, ECM, aluminum heads and closed cooling on the 525EFI.
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Old 10-03-2008, 02:48 PM
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300 hrs on my 500 efi's and just had the top ends done on both, He said that they were both in great shape but better safe than sorry
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Old 10-03-2008, 03:00 PM
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Originally Posted by Dock Holiday View Post
Both are great motors but personally I like the 500 because you don't have all the problems with sensors sending it into gaurdian mode. It is VERY easy and only requires a few minor changes to get a lot more power out of the 500 then what the 525 makes.

Heads, Cam and ECU reprogram and you are at 600 HP and it looks stock and idles like a stock motor.

I have seen a few motors have top end problems at or around 200 hours but very few. I know of several 500's with many more hours that have been trouble free. A mercury tech at the miami show told me that most if taken care of will easiely do 400 to 500 hours.
Can you make that with the carb motors?
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