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Info on Merc's 525SC

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Old 09-21-2002, 07:03 AM
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Question Info on Merc's 525SC

Hello All,,
Has or Does Anyone run the Merc. 525SC ???
I would like to Know the Good, Bad or Ugly about the Engine!! Is it Dependable, Long-life, Maintance, Etc,,,,,,
Thanks in Advance!!!!!!!







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Old 09-21-2002, 07:26 AM
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I've driven a 98 31 Sonic with 525SC's. I was very impressed by the motors. They idled happily for 20 minutes milling for the start of the poker run then were ready to rock as soon as the throttes were pushed. I would buy them in a heartbeat. BTW 89mph on speedo, so probably 83 or 84 legitimately.
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Old 09-21-2002, 09:50 AM
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Mitch,

Do I see upgrades in the future or could this be a whole new boat. Cmon man spill it.
 
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Old 09-21-2002, 10:46 AM
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I'm also interested in hearing about these motors as well. Are they taller than the stock 502 EFI and by how much? Where is the best place to look for one with low hours? Or would you be better off with a 500HP or 500EFI?

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Old 09-21-2002, 06:12 PM
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I am running a pair of 525SC in my 1997 Black Thunder. I have 190 hours on the motors. I had my blowers gone through at 150 hours and I have had no problems at all with the motors. The only problem that I have is that I have to replace the spark plugs pretty often. By the way the Black Thunder is for sale! I get 79 MPH out of the boat!
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Old 09-22-2002, 02:31 PM
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We have heard great things. I also saw some info in Powerboat Mag, check there.
 
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Old 09-22-2002, 06:13 PM
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I've got a 525sc in my Pantera and love the torque of the engine. It has 260hrs and I think I'm going to go through the top half in the off season.
Boost has been steadily creaping up (7-8 lbs). I think the valves may not be opening all the way to let fuel in or exhaust out. Runs fine still and doesn't seem to be down on power and uses maybe a quart of oil evry 20 hrs.
Long idles are no problem at all, except when it is REAL humid, then couple revs of the engine are needed every once in a while to clean off the plugs.
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Old 09-22-2002, 06:18 PM
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I have driven Griff's boat. And I can say that his motor is tough!! Just enough blower whine to let you know it's there, but not obnoxious like some I've heard. And it pushes his boat along pretty well too!!

Mama.......putting some new power in the Sunsation or looking at a different boat. Inquiring minds want to know.

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Old 09-23-2002, 01:18 PM
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I have also run Griff's boat. The 525sc seems to be a great engine. Relaible, good power and torque, good looks and just the right amount of blower noise. What more could you ask for?
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Old 09-23-2002, 01:21 PM
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Here is Griff's engine. This photo was taken roughly a year ago. Beautiful package!
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