Conference vicki::boats

    i'm not familiar with your boat. but i'll make an assumption
    you have an inboard with 2 exhaust hoses exiting thru the transom.
    
    If this is the case, here's an approach.
    
    Mufflers are rated in horsepower, lets say your engine is 250hp,
    if you want to keep the dual exhaust, then you would need 2
    mufflers rated at 125hp each. 
    Next figure out what length you can fit between your manifolds
    and the transom.
    Be sure to double clamp all of your connections.
    
    If you need new hose, make sure you use a "wet exhaust rated"
    hose, its pricey, but there ain't no substitutes...
    
    
    JIm.

    Dean,
       Check your trusty Overton's marine catalog, they have a couple of
    different types and call them at 1-800-334-6541.  Ask to talk to the
    marine manager and discuss your application with him.
    
    Another source is H&H Propeller in Salem Mass at 1-508-744-3806. I know
    they sell all kinds of marine mufflers and exhaust hoses. Don't know if
    yours would be on the shelf or not.
    
    Or, call a Mastercraft dealer, get a part number and by them from
    somewhere else to save a few bucks.  :^)
    
    Good luck,
    Doug

    
    
    Dean,
    
    	I assume your MC already has mufflers. Are you looking for 
    something quieter than the stock mufflers? If so, I would think
    that most "straight" replacements would probably sound about
    the same. How about fitting a new Nautique (Vernay) exhaust
    system on it?
    
    Rick

    Better yet, call Vernay Laboratories (77 S. College St., Yellow Springs
    Ohio) at 1-513-767-7261, makers of Vernatone Fiberglass Marine
    Mufflers.  Ask them..
    DW

    Dean,  Performance Boat in Hooksett sells an in-line muffler
    that's about 5 inches long (4 inches in diameter).  They do
    some pretty high performance boats there.  I'm sure they 
    could help you out.  By the way, if you plan on boating in
    N.H., mufflers are required now on all boats.  The allowable
    DB level is based on what year your boat was manufactured.
    Make sure you get a muffler capable of quieting the sound
    to the level required for your boat's year.
    Wayne
    

    Dean
    
    MAybe it's time you just let me take that vintage MC off your
    hands real cheap and you buy something new, that is quieter.
    On my lake there not that fussy.....
    
    Enjoy the summer skiing!
    
    Mark

    Moved by moderator...
    
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Note 851.0                Help with selecting mufflers?               No replies
SALEM::NORCROSS_W                                    15 lines   4-JUN-1991 11:54
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    Help!  I need to add mufflers to my inboard to get below 89 DB's
    per N.H. laws.  Before I couldn't find anything that would fit
    now I'm finding too many types to make up my mind. I've narrowed the
    search down to a couple specific types (neoprene from Ward's or
    ski boat one's from Overton's) but the problem is that I have 2.5"
    exhausts and everything is designed around 3" or larger.  Everything
    can be made to fit with bushings or adapters.  Roger Gaudet has
    installed the Overton mufflers on his boat and I am awaiting his
    opinion on any power loss.  Has anyone used the neoprene units?
    The one muffler which I found with 2.5" inlets/outlets are cast iron 
    units in the Osco catalog.  They are pretty cheap, would fit, and
    wouldn't require adapters.  Any reason why I couldn't use them?
    This is for fresh water use only.  They were $74 each.  
    Thanks for any help.
    Wayne

    Wayne,

    I have a catalog from a company called MM that is about a dozen pages
    of mufflers, most of which are Fiberglas.  This is the company that
    makes the "Dapars" that are sold by Boat U.S. and others.  I took a
    glance at the MM catalog and they did have some with 2 1/2
    inlets/outlets.  The catalog is good because it gives several
    dimensions for each muffler.  I am not sure if they do retail
    business, so if you contact them, you may want to ask about retailers
    in your locality.  The catalog I have is a few years old.  Below is the
    address. 

    Matt

    Marine Muffler Corp.
    185 East 9th street
    Apopka FL	32703-6401
    407-886-1144	FAX 407-886-4702


    P.S.  You mentioned an Osco catalog.  How can I get my hands on one of
    those?

    Thanks for the tip, Matt.  I called the number in Florida to ask for a
    catalog.  They are out of them right now, the next printing is at the
    end of the summer.  She did tell me though that H + H propeller in
    Salem, Mass. is their regional distributor and since I was heading down
    to H + H next week to have my prop shaft shortened, I'll look at their
    catalog.  Good lead!
    To get an Osco catalog and latest price list call: 215-855-8268.  They
    will mail you one free.
    Thanks, Wayne

It might benefit you to call H & H first regarding the mufflers.  When I was
there a couple of months ago the guy showed me some Vernay mufflers.  He didn't
have any MM mufflers.  I ended up buying the Ski Boat Silencers by MM through
Overton's.  My reason for going to H & H was to check on engine mounts, which
they were unable to help me with.  So I asked about mufflers and the guy showed
me the Vernays (which were about a foot long, $170/pair, and for some reason
didn't give me this warm and fuzzy feeling that they'd do the same job as the
41" MM mufflers). And to top it all off, H & H couldn't help me with
couplings/fittings for my 2-1/2" exhaust.  They referred me to Ward Marine in
Winthrop where I ended up buying almost everything I needed (except the mufflers
which, BTW, were also the Vernay bullet-type).  Call Ward Marine (617-846-1421)
and ask for Gary.  He's very helpful.

Maybe H & H will be more helpful since you're going there with a prop-related
issue.  The guy didn't seem too enthusiastic about helping me with my muffler
problem, nor my engine mount problem, etc.  Maybe he was having a bad day or
something, but the best thing he did for me was to tell me to go to Ward.

Just my opinion.

...Roger...

    Roger, H + H should at least have the MM catalog to let me see if MM
    makes a "perfect fit" muffler with 2.5" inlet/outlet so I don't have to
    go with adapters to get up to 3".  I could then special order them.
    The added cost of special ordering something would be offset by
    not having to buy adapters.  I put a Chevy V-8 in an Army Jeep with
    exhaust adapters.  Even with double clamps they would tend to leak
    after awhile and constantly needed tightening. 
       I am pretty well convinced that I will be using the same mufflers as
    you have.  Seems to be the cleanest installation and best fit.  I do
    have one last question to throw out there.  I just received my
    membership to Boat/U.S. and their 1991 annual equipment catalog.  On
    page 56 they show a "Parker Muffler Silencer".  The picture is not too
    good but it looks like some type of rubber cap which mounts with screws 
    over the exhaust pipes on the outside of the boat.  They claim 90% 
    noise reduction with less than 1.5 cubic inchback pressure @ 4000RPM.
    They are only $30 each and I'm sure I could figure out how to mount
    them in a less than permanent fashion should I want to return the boat
    to total original condition (which so far it is.)  They are good for up
    to 275 HP which is 115 HP more than I have.  Any thoughts on these?
    What does 90% noise reduction mean?  I know it's not linear, ie: if
    you start with 100 DB (which is close to where the boat is now) it
    won't bring it down to 10 DB.  Also, I have never seen backpressure
    figures listed for any of the other mufflers I've been looking at.
    Any thoughts?
    Thanks, Wayne

    After seeing all of the boats at the Lake Winny Antique and Classic
    boat show this weekend, none of which had any forms of mufflers, I have
    decided that the law requiring 89 DB's for my 1965 boat either isn't
    enforced or 89 DB is louder than I thought.  There was even a brand new
    mahogany repro runabout (about a 20') with a 478 HP, 454 Cu.In. Chevy
    that was running the exhaust straight out.  If the Marine
    Patrol isn't going to bother him then they aren't going to stop me with
    my little 26 year old putt-putt.  
    Wayne