575sci Blower Question....
 

I need to find out what size Weiand Blower is on my 2002 575sci...... it is the blower with the "W" on the front cover and has both bearings in an oil bath. I am trying to find out what manifolds were used so I can find a replacement.....mine are showing signs of corrosion....

did some thread searching...is it a 256.....

I just looked at one of my intakes out in the shop.

It's a weiand piece also, it has 6140 cast on the underside

jegs list it.

http://www.jegs.com/i/Weiand/925/6140/10002/-1

If its just around where the water ports in the intake meet the heads, you can have them ground out and welded. I had to have my 525SC aluminum intake welded in that spot.

I am heading to the machine shop today, and am pretty certain they can fix them........I am just finding out in case I have to go with new ones........ I will keep you posted on the outcome.......

Hi Guys,
If anyone needs one of these intakes in near new condition, I will sell mine for $350. Freshwater only.
Regards,
Steve

The only difference is that these are cast iron. Lots easier to weld aluminum.

I did not know they were cast iron. I just figured aluminum like most perfiormance intakes.

Mine are aluminum

Are they original from Mercury? If so, what year are your engines? We looked at replacements, as you said, Weiand makes a direct replacement. The concern is they are aluminum and will corrode faster than the cast iron ones did. I called a company in Connecticut, who I use to ceramic coat things. I have had them do a few intake manifolds for me in the past. Mostly, I had the coating put on for asthetics. Anyway, they claimed they have ceramic coated aluminum intake water crossovers, strictly for corrosion protection. They claim the process yields successful results. In case the intakes are deemed unrepairable, we may go for new Weiand aluminums and have them coated.

Anyone ever try this?

Mine are 2002's.....never been apart.

They look aluminum ( on the underside), feel aluminum.... and a magnet wont stick to them.

I know merc use to coat the cooling passage with
a bronze coating on engines with aluminum intake manifolds,
I don't know if they're still using that process.

JayTee,

I didnt do the magnet test. The manifolds are too heavy to be aluminum. When I cleaned the gasket surfaces with my air operated cookie cutter, I would have noticed it taking off metal. The gaskets were the only things coming off.
The machine shop who is doing the welding and milling said they are not cast iron, but an alloy of some sort. John talked directly to them, I am not sure of exactly what was said. My hope is that they can weld them. Sure felt like cast iron to me.

Mine is too heavy to be aluminum. If anyone needs one give me a shout.
Steve

The ones on my 2002 575's are aluminum. They apear to be hard coat anodized. I just welded them up with 6061 rods and checking into having re-hardcoated. They only needed welding at the rear of the manifold at the water passages.

My machine shop says they are indeed aluminum..... but they are either mixed with some other metal or maby it is the anodizing. They have already welded them and will be finishing them up today......... We will decide then if they are worth using or not..........

So where was the problem? I just got mine and they have about 250 hrs of mostly Saltwater use. Should I be checking something? What kind of hours do yours have?

They are aluminum. I too had mine welded and then powder coated water passage for corrosion protection

Thats the heaviest aluminum I have ever picked up.. Fooled me for sure.

The problem is at the water passeges...it actually appears to be corroding out from under the gaskets....... I would keep a close eye on them...... my boat had 195 hrs of fresh water use when I bought it...... I put about 150hrs of salt water use with flushing after every use...... and they are showing corrosion at the water passeges...... I am not to happy with the way they look after the repair so I have to decided to go with new ones and have them coated for salt water use.... I have to much time and money invested at this point to cheap out now......

We also had corrosion on the 575's in the Cig Mystique. Merc 's prices on new intakes are rediculous. We decided to upgrade with Whipple intercooer intake manifolds.

I like your idea Biggus. Will keep an eye on mine. Thanks

Biggus, Couple questions for you.
Your flame arrestors look like they are low profile. Where did you get them?
Are you dumping the intercooler water over the drives? I was thinking about doing that with mine and using the water for the drive showers.
Thanks....sorry for the hijack:party-smiley-004:

I picked up a complete set of 575SC's for both motors yesterday. Looks good without looking too close yet, but the intakes will need some welding on one port. Both intakes are good except on the port front water passage. One would work, one is too close, less than a 1/8 left. Plan on converting my 500EFI's with these for some power gains.

Ciaod, who welded yours up?

Biggus, How's things going?

Linnie, One of the welders in my shop did them. Let me know, we can hook you up.

Thanks, will catch up with you after New Years, heading back to the river shortly.

Are there 2 oil checks? I found the one in the front but dont see any in the back. Anybody? They are Welands (SP?)

It's on the back plate, it's an allen head plug....kind
of in front of the distrtibutor

it's not in the same location as the front one is.

What oil do you use?

merc says their hi perf gear lube.

I use Amsoil gear lube...same as what I use in the
drives.

While your at it, better check the oil in the sea pump/ fuel
pump assy, it gets kind of dilluted.

I believe the flame arrestors are the stock 575SCI's, just repainted by Lip Ship.

Yes, the excess water is dumped on top of the drives. We rigged seperate transom mount pick-ups with water pressure relief valves (Mc Master-Carr) set at 20 psi through a pair of Hardin Marine intercooler strainers.

Not sure if dumping the intercooler water on the drives is really doing anything but one thing I've noticed is the drive lube does not push out the reservoir anymore.

Along with instaling the Whipple intercoolers, the motors now have flat top blower pistons, custom ground Ultradyne Hydraulic roller cams (similar grind to the 525 EFI cam) some port work on the stock heads and re-programmed boxes. Blowers have smaller pulleys, boost @ 5psi.

Unfortunately we did not dyno with the Whipple intercooler/pulley swap but they did make 696 hp with the stock blower set up. I'd guess they are now making at least 725-750 hp And extremely reliable too, these mods were done back in 2005. Motors now have about 70 hrs and run cleaner than a stock 575SCI. The boat is a hoot to drive, spinning 37p Mercury Racing Bravo 4 blades at 5450.

Good luck with the project Linnie, are you going to retain the stock 575SCI throttle body fuel system?

Going to keep the stock 575 system, unless something is wrong