Offshoreonly.com - General Comparison Merc 575's vs 525's

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- - General Comparison Merc 575's vs 525's (https://www.offshoreonly.com/forums/general-q/172338-general-comparison-merc-575s-vs-525s.html)

ActiveFun

11-01-2007 02:18 PM

How come nobody is factoring in all the header problems with the 525's?? I ve heard that alomost every 525 has header problems.. Is that true?

HALLETT FAN

11-01-2007 02:54 PM

Looked at a used boat a while back with the 575 package, the things I didn't like were the old school flat tappet cam, not roller, and the
fuel system, though FI , was old school throttle body, not the most desirable for future modifications.

BKSAE

11-01-2007 05:28 PM

Quote:

Originally Posted by baja bailey (Post 2324437)

Where in e'ville do you live??

I live in Henderson, boat at KY / Barkley lakes. Boat stays in Eddyville/Kuttawa area.

Here's Johnny

11-01-2007 06:53 PM

Active.......At first I almost didn't buy my Sonic because it had the 575's.......after a lot of research on OSO I went with them........and man am I glad I did......nothing beter then hearing those blowers kick in (whine) when getting on the throttles.......all I did was buy an extra blower and have them all rebuilt one by one....better to be safe then sorry. Other then that it is typical maintenance.......... are you looking at something with 575's.......:D

Vinny P

11-01-2007 07:16 PM

Quote:

Originally Posted by JOHNNYD454 (Post 2324835)

.....nothing beter then hearing those blowers kick in (whine) when getting on the throttles........:D

I didnt know you ever got on the throttles this year.
:violent-smiley-045:

Except for the day I broke my crankshaft. You had to lean on them a bit to run with me, until I blew it up.

:hitfan:

Here's Johnny

11-02-2007 04:15 AM

Quote:

Originally Posted by checkmate454mag (Post 2324862)

I didnt know you ever got on the throttles this year.
:violent-smiley-045:

Except for the day I broke my crankshaft. You had to lean on them a bit to run with me, until I blew it up.

:hitfan:

HaHaHa....lol......thanks Vin.......I know I don't go nuts but every once in a while I do get on them.......and besides just getting on plane sounds great.............

Kelly O

11-02-2007 06:24 AM

Quote:

Originally Posted by bluelightning (Post 2324406)

575s w/ arizona upgrade + superchiller push my 01-42' lightning well into 90mph range. Easy gains for not much money. Still start, idle and run like EFI motors. After 4 years, nothing negative to say about 575 SCi's. Fuel economy is not nearly as bad as spoke about.

Did you change head gaskets when adding upgrades and chiller ?
What gaskets are being used when raising the boost ?

baja bailey

11-02-2007 08:16 AM

Quote:

Originally Posted by bluelightning (Post 2324761)

I live in Henderson, boat at KY / Barkley lakes. Boat stays in Eddyville/Kuttawa area.

Thats what i thought.:D

BKSAE

11-02-2007 12:49 PM

Quote:

Originally Posted by Kelly O (Post 2325160)

Did you change head gaskets when adding upgrades and chiller ?
What gaskets are being used when raising the boost ?

Yes I did upgrade gaskets. With the chiller, the boost as I understand doesn't necessarily go up because the engine volume is increased. My gauges still read between 5 and 6 at WOT which is what they read before the upgrade, or least very close.

ActiveFun

11-02-2007 12:57 PM

Quote:

Originally Posted by JOHNNYD454 (Post 2324835)

Not really, I'm doing a little research on what I may be looking into getting next and see some with both motors.

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