Merc 575 ???
 

Ok guys .... lets hear it ... 575's ... The good , bad , and ugly ???

I loved mine and they were very dependable. The whine at WOT was also a plus. They're pretty easy to upgrade too.

No complaints here.

Neither use a drop of oil, and have
330 hrs on them.

The only bad I've heard is with the newer units
that have the B&M blowers, the rear bearings
in the supercharger have had a few failures.


Love the whine too:D

Call Ben at Precision Marine Offshore in Grand Haven, Michigan....he has worked on a boat with tripple Merc 575sci's over the past several years....and has even upgraded/modified them. (616) 889-2234

Gellner took a few from 575 to 750 pretty easy. A year or so ago I made the decision between 525 and 575. I chose 525 because:

1.) Unless you're going to make them 750's, the 3-4 mph difference between the two engines was not enough (on real hot days I've heard they run pretty much the same speed)

2.) didn't want to hunt for 91 octane (525 runs on 87)

3.) 525 is still being made, 575's are being phased out for the 600 and 700 package

4.) I'd rather have efi n.a. up to the 700 mark, then go blown beyond that, less maintence in my opinion

5.) More market on re-sale of 525 (again just my opinion)

Thanks guys !

I have been told alotta guys a running 89 octane with no issues .... Any of you guys have experience there ???

Love Mine so far.......do a search on here (OSO) and you will find plenty of info on them.......

Had a pair in a 382 Formula, & w/ about 20 easy new hours the st. blower grenaded & took out the hole engine. Then all new long block and blower(NEW ENGINE) even though Merc would not call it that! same engine had other issues, don't remember exactly in 2nd summer. Fixed, then summer of my 3rd season w/ the boat & about 100 or so hours if I remember right, both right & left engines, the bearings in the pully's at the front of blowers went bad! End of that boat!!! Not real technical so hope my story makes a little sense. Very Very bad experience w/ these engines! & I am not hard on my stuff!!!!!!!!!!!!!:(

Short time with mine so far but love them. Mine were freshened and bumped to 625 by Innovation before I got the boat. They start and idle extremely well for blower motors. The throttle response and blower whine are awesome and they are surprisingly fuel efficient. I ran the Sarasota Poker Run (80-90mph), burned 110 gallons and covered more than 110 miles. The boat tops out at 103ish.

stated was 92 when they first came out and was revised by merc to 91 later.

460 hours and 6 years on two 575SCi's bone stock.

Part of yearly maintenance is to check the oil in the little
drive unit for the diaphragm fuel "pre" pumps at the front
of the engine by the raw water pumps (else they run dry
and ruin said pump).

The head gaskets suck. You're on borrowed time with them.
Mine just failed leakdown specs at 450 hours so I refreshed the heads anyway.

I have the early blowers, those are the reliable ones (although
I did have to have one blower rebuilt when the boat was two years old, the blower was consuming oil). And that reminded me, keep tabs on blower oil. There are front and rear reservoirs.

In general I'm pretty happy with them.

Pesky Varmint

I mainly run 89 octane with no issues and the engines run strong. Contacted Merc. on the octane issue and they said the engines will be fine at 89 octane. Regardless, I add Supreme 130 octane boost when using 89.

Very reliable stock with the above caveats (****ty head gaskets, blowers should be rebuilt at 100 hrs, mechanical fuel pump reservoir issue is common to several blue Mercs).
Easily modifiable for more HP. Likes more boost and intercooling. MEFI 3 is easily reprogrammed.
I agree the 525 is also a good motor, but the computer is to my knowledge unhackable, making mods difficult. If you are leaving it stock, OK. But I think horespower is like t-ts, you'll rarely hear someone say "she has too much" :D.........
Regards,
Steve