Like Tree0Likes

Couple of 250 B&M Blower ?'s

Reply
Old 04-23-2007, 08:37 PM
  #1
Brotherhood #1
Gold Member
Thread Starter
Trade Score: (16)
 
Sick Stinger's Avatar
 
Join Date: Sep 2006
Location: Swansea Mass
My Boats: 33 Sutphen outrageous P3
Posts: 10,188
Default Couple of 250 B&M Blower ?'s

I have a 250 B&M Blower atop a 509. Couple questions, one stock pulley what should the boost be? Im running about 3.5 4 psi i believe. 2. Should i run a smaller pulley? is it worth it and would it pose any interanal problems. 3. I see that there is a vent in the front of the blower snout, its pushing out oil? anyway to stop this and what causes it? Thanks all for the input and thanks to everyone with the help on the carbs it rain pissa sunday, ran a 79.2 on the gps with no air grates to force the air in the engine bay hopefully with those and a little more tuning ill break mid 80's and be happy there
Mike
Sick Stinger is offline  
Reply With Quote
Old 04-23-2007, 09:08 PM
  #2
Registered
 
The Menace's Avatar
 
Join Date: Nov 2002
Location: Bonita Springs, Florida
My Boats: 46 turbined Skater
Posts: 3,029
Default

Historically that particular blower's bearings are a little undersized and should be replaced. Since the bearings are small they tend to wear out quickly. When they do the rotors will start to bang together and the shavings will erode your rings etc. A rebuild alone may significantly improve your performance. New teflon strips will pack more air.
The Menace is offline  
Reply With Quote
Old 04-24-2007, 07:14 AM
  #3
Brotherhood #1
Gold Member
Thread Starter
Trade Score: (16)
 
Sick Stinger's Avatar
 
Join Date: Sep 2006
Location: Swansea Mass
My Boats: 33 Sutphen outrageous P3
Posts: 10,188
Default

Thanks menace looks like ill be talking to the blower shop.
- Mike
Sick Stinger is offline  
Reply With Quote
Old 04-24-2007, 09:04 PM
  #4
Registered
 
Join Date: Nov 2000
Location: LOTO
My Boats: 85 Chris Cat
Posts: 255
Default

The plugs in the top oil fill have a hole in them replace the plug with a unvented one. What size pulley is on the blower the smaller spins it faster and the more heet it builds so more boost doesen't always make more power.
fstboater is offline  
Reply With Quote
Old 04-24-2007, 10:03 PM
  #5
Brotherhood #1
Gold Member
Thread Starter
Trade Score: (16)
 
Sick Stinger's Avatar
 
Join Date: Sep 2006
Location: Swansea Mass
My Boats: 33 Sutphen outrageous P3
Posts: 10,188
Default

FS its the stock blower pulley, true about the pulley didnt think of it that way about makeing the more heat so ill have to keep that in mind. So i should just get a new venting plug because mine is clogged?? is that what you mean
Sick Stinger is offline  
Reply With Quote
Old 04-25-2007, 09:03 AM
  #6
Registered
 
Liquid Liability's Avatar
 
Join Date: Sep 2004
Location: Looking for my lost EBITDA!!
My Boats: Baja H2X, 2008 Fountoon Quad-Step-Tri-Toon Stripper Pole Edition
Posts: 227
Default

Quote:
Originally Posted by The Menace View Post
Historically that particular blower's bearings are a little undersized and should be replaced. Since the bearings are small they tend to wear out quickly. When they do the rotors will start to bang together and the shavings will erode your rings etc. A rebuild alone may significantly improve your performance. New teflon strips will pack more air.
DITTO
I melted mine down in '04, sent it to the Blower Shop for the rebuild. The only thing original on it now is the case!
Liquid Liability is offline  
Reply With Quote
Old 04-25-2007, 11:52 AM
  #7
Brotherhood #1
Gold Member
Thread Starter
Trade Score: (16)
 
Sick Stinger's Avatar
 
Join Date: Sep 2006
Location: Swansea Mass
My Boats: 33 Sutphen outrageous P3
Posts: 10,188
Default

Thanks Liquide i will have to hit the blower shop up. do they have a heavy duty bearing for that or heavy duty setup?
Mike
Sick Stinger is offline  
Reply With Quote
Old 04-25-2007, 01:09 PM
  #8
Registered
 
Anarchy Powerboats's Avatar
 
Join Date: Jun 2004
Location: Phoenix, Havasu, Newport
My Boats: www.anarchypowerboats.com
Posts: 3,060
Default

Quote:
Originally Posted by Sick Stinger View Post
I have a 250 B&M Blower atop a 509. Couple questions, one stock pulley what should the boost be? Im running about 3.5 4 psi i believe. 2. Should i run a smaller pulley? is it worth it and would it pose any interanal problems. 3. I see that there is a vent in the front of the blower snout, its pushing out oil? anyway to stop this and what causes it? Thanks all for the input and thanks to everyone with the help on the carbs it rain pissa sunday, ran a 79.2 on the gps with no air grates to force the air in the engine bay hopefully with those and a little more tuning ill break mid 80's and be happy there
Mike
Anarchy Powerboats is offline  
Reply With Quote
Old 04-25-2007, 03:30 PM
  #9
Brotherhood #1
Gold Member
Thread Starter
Trade Score: (16)
 
Sick Stinger's Avatar
 
Join Date: Sep 2006
Location: Swansea Mass
My Boats: 33 Sutphen outrageous P3
Posts: 10,188
Default

So metal i will see internal problems? danm
Sick Stinger is offline  
Reply With Quote
Old 04-25-2007, 04:43 PM
  #10
Registered
 
Join Date: Jan 2006
Location: St Louis/LOTO
Posts: 733
Default

1) There really isn't a "stock" pulley. You change the blower pulley to change boost. Smaller = more boost.
2) The amount of boost you can run depends on how the engine was built, compression, cam, heads, ignition advance etc. and the octane rating of the fuel. If you dont know about this stuff, dont screw around with it. You could melt a piston.
3) There is a vent/plug. If it's pushing oil out, your blower seals may be going bad pushing gas/air into the front lube reservoir. I would suck out all the gear lube in the resroirs (probably contaminated with gas) and replace with new gear lube. Then watch and see if it starts overfilling quickly.
rdoactive is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
carter38
Wanted
4
03-19-2008 06:14 PM
johnnyboatman
General Q & A
3
10-23-2005 08:40 PM
Wilks
General Q & A
3
10-19-2005 08:59 PM
28SCARAB
General Q & A
4
08-23-2005 06:20 AM
PROFILE
General Q & A
6
07-17-2004 05:49 PM



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 05:41 AM.


Copyright 2011 OffShoreOnly. All rights reserved.