Intake screen for 575sci blower?
 

Stupid question (I ask a lot of these)

Looking for extra protection for my engine in the event of a supercharger failure. Things I think I already know

-The early 575sci super chargers are know for coming apart

-Chillers add some protection for these parts falling into the engine

-Many have swapped out the blowers or added chargers

-The chillers may cause complitcations with pooling, and of course complicate the set up

These engines are 2002 models with zero run time since new.

Does someone make a screen that goes in-between the blower and the intake?

I would like to run it stock for a while before chillers, just looking for some extra protection.

I do plan on removing the blowers, checking for drag and changing the 10 year old oil.

Thanks

just pull them off and have them rebuilt/checked...not worth chancing a 20k or more engine rebuild to rebuild the blowers for $1500.

The earlier blowers were actually the better style of the two though.

-If you don't mind...what's the story on a 02, with no run time either of the engines?

Call Ron Hayes @ The Blower Shop. And yes the older ones are much better.

new repo from a boat dealer, never titled or sold.

So the older blowers are actually better?

Rebuild or not I still want a screen. I remember seeing a screen gasket for a 6/71 years ago

Thanks

I have an '02 with the W on the side and reservoirs front and rear.
Are these the better blowers?
I haven't had a failure but I did replace the bearings at 150 hours or so. I was also able to squeeze in an extra seal on the two rear seal/bearing areas. About $100 in parts for both blowers.
I'm getting ready to rebuild again and have looked into ceramic bearings.
What do you think of them?
I change the oil every 50 hours and it always looks good. I've been using the recommended Bravo HP gear oil.
What do you think about switching to Torco?

The B&M's have sealed ball bearings in the rear, I've heard
of more issues with them failing than problems with the Weiands.

The early run"W" which are the Weiand blowers had better bearings, cases and oiling reservoirs. Holley bought out Weiand and changed the blower to cheapen them up. Have 2003 575 SCI that had Holley style. Both locked up with 70 Hrs. Part of the problem is the boat came with a superchiller and small pulley. The Holley blowers can't handle the high RPM, blades locked together. Bought some Weiand versions, sent them to Blower shop and had the good parts put in. 140 Hrs. still going strong. But with the small pulley, I'm still walking a fine line at that blower RPM. I use Blower Shop oil. Not sure what it really is.

Not trying to be a smart azz but if a blower starts to come apart do you really think a piece of screen is going to stop the pieces ? I would think if it got that bad I would take the engines apart any way . Just my .02

Guess you have a good point.

Guess I am just paranoid after searching 575sci on this site, hooror stories.

Ill just run em

Is it the bearings that die? Or something else?

I have the old style which are the better blowers that came with the 575's......I just sent mine to Darren Mayor and was told they are in the best condition they have ever seen come through their shop.....why? Because I change oil every 50 hrs....and this is the second time I have had the blowers gone through and the bearings changed........ I guess anything can happen but, an ounce of prevention is worth a pound of cure......if you find a screen that works let us know, I am sure it wouldn't hurt, but proper maintenance is surely the best insurance......

and yes it is the rear bearing in the later (B&M) blower that fails (grease packed).....once the bearing fails the two rotors inside start to bang into one another and eventually (rather quickly I am sure) self destruct and pollute the engine with shrapnel which then causes catastrophic ($$) failure.......

isn't a screen going to stop a lot of airflow? and 4bus, please turn your avatar around and take another pic...

You have the preferred blowers, change oils and run them.

Seems the biggest issue with the pre-03 575's is head gasket failures. When I got my 03's I searched here and found that 02's and older used gaskets that were very prone to failures. The advice given for 02's and older was upgrade head gaskets immediately.

Funny, they told me mine were the best they had seen. Brian asked why they were there and if they had been run. Told him preventative service based on all the horror stories. DMP does a great job with service and upgrades to these blowers.

that's funny......guess we both take care of our stuff, or Brian is just blowing smoke up our arses...lol.......:cool-smiley-027:

Mine were there a few years ago. Yours are now the bestest:whistle:.

More good news, followed by bad news :) How soon were these head gaskets know to fail? Safer to get at least this season out of them?

I am no expert so I really can't answer that question, but I am curious to know if after sitting for so long with no run time on the boat/engines/drives is there other stuff that should be checked for like dry rotting of gaskets and hoses ? or anything else to be looked after before running her....... and 4bus, good luck to you with the new boat, sounds like a great find !!

Yes, going to do a top to bottom inspection. They run great on the hose, and you can still see yourself in the merc blue paint. Hoping for trouble free operation, but you never know.

Aside from ten years of dirt in the bottom of the bilge, they look pretty good :D

Attachment 469129

http://www.offshoreonly.com/forums/g...se-575sci.html

Read this thread and search other 575 threads from this section.

Bilge looks great, when do we see the rest of the boat ?

I change the SC oil every 50 hours, at least. Rebuilt them at 150 hours of stock use, 4" pulley, and they looked great. Just pulled them apart and everything is still great 150 hours later with a 3.5" pully. I'm looking into ceramic bearings because I've heard they're better. Tighter tolerances. And also wondering about Torco as I'm hearing it's the cat's meow for drives. I've been using Merc's gear oil. I know what I have works but is there something better?
FYI
bearings are 6204 with one seal taken out.
I put the sealed side towards the actual seals and put Redline synthetic grease CV-2 in between the bearing and seal. Open side toward reservoir.
seals are 10142-TBY

Ceramic bearings don't seem to be able to take the load of this application. Their main benefit is lower rolling resistance. Great for a bicycle, go cart, etc. Full ceramics are "delicate". Hybrids, ceramic balls/steel races, are a bit tougher. Full metal are the best. Use a good brand. I think I'm on to an SKF rated for 17K RPM compared to the last ones rated to 11K RPM.
Those are basic #'s, but "in general".
The math that goes into bearings is awesome.
Take a numbers from:
How the lubricant adheres/flows
The load
Oil bath vs dry sump vs sealed
Temp
Probably a few others
I'll just keep changing the oil.

How about the oil?
The Torco seems similar to the stuff ProCarger uses. What's it take, 8oz or something, and they hold up great under crazy RPM.

Here is the rest Kelly, wish it had your paint!
Attachment 469856
Attachment 469857
Attachment 469858

very nice 4bus. run them and enjoy. Is the red canister the power steering reservoir? Never seen that on a 575?

Thanks,

Ya it is the ps res, go figure they run a read one? all my others in the past have been blue

Ok, now I know what boat to watch for on the water. Have not seen that paint combo before, looks nice.

Ready for a test ride ? Gonna be pretty mild here !

The blowers are not very stout...even the earlier wieands. A back fire can knock the rotors out of time and in turn make them contact each other. One or both of the rotors then bend and gall against each other...and possibly crack the bearing retainers. When mine went at high speed the aluminum went through the motor and caused no damage...Dustin whipple said it is very common and has not seen damage because of it.

I ran out of gas on one of my dual tanks (broken sending unit). Backfired it a few times trying to restart it, blower didnt last long after that. The rotors are timed with very thin shims that can and do bend in a sudden stop situation due to the angle cut gears.