How I made my M25XP quiet.

Discussion in 'Catalina 30' started by AaronHPMC, Sep 11, 2013. Add this thread to a FAQ

  1. AaronHPMC

    AaronHPMC

    Joined Aug 26, 2013
    24 posts, 0 likes
    Catalina 30 MKII
    Ca Horseshoe Bay
    After a few trips on my Catalina 30 wishing, hoping and praying there would be good wind, there was not. Day after day I was going to have to listen to the obnoxious drum of my engine. The factory air cleaner was nothing more than a tin can with some holes in it and what looked like course steel wool. Having a friend with a Kubota tractor 24.5 horsepower and hearing how much quieter it was I decided to make the air cleaner from that model tractor work. The improvement was dramatic! In the photos I have attached you can see it fits nicely. I have put 20-25 hours on the motor since doing the job. Fuel economy remains the same as well as power. noise reduction is dramatic. When the engine is at idle I can go into the cabin and hear the fuel pump ticking away now!
    From the parts diagram I used 001 (complete air cleaner assembly)
    009 (intake hose which was cut down)
    010 x2 clamps
     

    Attached Files:



  2. jviss

    jviss

    Joined Feb 5, 2004
    3,125 posts, 412 likes
    Tartan 3800
    US Westport, MA
    Nice! Thanks. What did it all cost?
     


  3. AaronHPMC

    AaronHPMC

    Joined Aug 26, 2013
    24 posts, 0 likes
    Catalina 30 MKII
    Ca Horseshoe Bay
    Total was around 225 CAD. I have attached a better pic of the part #'s I just called a local Kubota tractor dealer and they had all the parts in less than a week.
     

    Attached Files:



  4. jviss

    jviss

    Joined Feb 5, 2004
    3,125 posts, 412 likes
    Tartan 3800
    US Westport, MA
    Thanks very much! I'm having a bit of difficulty visualizing it from your pics - does it go through the rubber pipe and then aft? What's the muffler housing attached to?
     


  5. AaronHPMC

    AaronHPMC

    Joined Aug 26, 2013
    24 posts, 0 likes
    Catalina 30 MKII
    Ca Horseshoe Bay
    Yes. The intake hose goes back ad the intake air cleaner is located above the transmission tucked up into the starboard corner
     


  6. Stan Breaux

    Stan Breaux

    Joined Feb 8, 2007
    141 posts, 11 likes
    Catalina 36 MKII
    US Pensacola Beach, FL
    I have a 1996 Catalina 36 MKII with an M30, or maybe an M35??

    My engine seems to be very loud compared to other boats I hear.

    Would something like this work for me?
     


  7. jimmcgee

    jimmcgee

    Joined Feb 26, 2008
    600 posts, 6 likes
    Catalina 30
    US Marathon, FL
    Aaron,
    It looks like you've also added some kind of sound proofing material to the engine compartment. What did you use?

    I was amazed at the difference new motor mounts made. I'd love to quiet down my engine down even more.

    Jim
     


  8. fox islander

    fox islander

    Joined Jun 5, 2004
    241 posts, 2 likes
    Catalina 30 MkII
    US Foss Harbor Marina, Tacoma, WA
    ...you guys just added a project to my fall list. I do believe our boats to be a bit louder than most.
    Thanks
     


  9. AaronHPMC

    AaronHPMC

    Joined Aug 26, 2013
    24 posts, 0 likes
    Catalina 30 MKII
    Ca Horseshoe Bay
    If you have the room, I dont see why not. Being that you have a higher power engine, you may want to source from a slightly bigger tractor made by Kubota...
     


  10. AaronHPMC

    AaronHPMC

    Joined Aug 26, 2013
    24 posts, 0 likes
    Catalina 30 MKII
    Ca Horseshoe Bay
    The boat already had the sound deadening when I got it. It is pretty thick, near 3/4". Yes, I have had softer mounts installed too. Much easier on the fillings!
     


  11. AaronHPMC

    AaronHPMC

    Joined Aug 26, 2013
    24 posts, 0 likes
    Catalina 30 MKII
    Ca Horseshoe Bay
    I just did a trip which unfortunately turned into an all motor trip. Not a spot of wind. I found after making the engine much quieter that it became a lot less fatiguing on a longer trip...
     


  12. Coriolisbc

    Coriolisbc

    Joined Jun 29, 2011
    142 posts, 0 likes
    Catalina 30 Mk II
    Ca Gibsons
    Thanks Aaron, I will be doing this fix this fall.
    Roy
     


  13. Stu Jackson

    Stu Jackson

    Joined Feb 26, 2004
    20,531 posts, 950 likes
    Catalina 34
    224 CA Maple Bay, BC, Canada
    Why Knot?

    I absolutely REFUSE to do this!

    If I can't feel that beast RUMBLING beneath my feet, so I can find out if the damn coupling threw yet another bolt, I don't want that engine.

    Rumble, rumble, tank, tank...:eek::eek::eek:
     


  14. AaronHPMC

    AaronHPMC

    Joined Aug 26, 2013
    24 posts, 0 likes
    Catalina 30 MKII
    Ca Horseshoe Bay
    Roy,

    I used Vanderwall equip. in Albion. I talked to mike there. They were pretty good and had the parts in a couple days...
     


  15. AaronHPMC

    AaronHPMC

    Joined Aug 26, 2013
    24 posts, 0 likes
    Catalina 30 MKII
    Ca Horseshoe Bay
    Quite the contrary Stu. The quieter engine does a great job feeding my paranoia... It leaves my ears to hear all sorts of disastrous noises that really arent anything!
     


  16. Stu Jackson

    Stu Jackson

    Joined Feb 26, 2004
    20,531 posts, 950 likes
    Catalina 34
    224 CA Maple Bay, BC, Canada
    Good one, Aaron. :)
     


  17. jimmcgee

    jimmcgee

    Joined Feb 26, 2008
    600 posts, 6 likes
    Catalina 30
    US Marathon, FL
    Aaron,
    Just circling back to this as I ponder winter projects. This one definitely made the list.

    Thanks for posting it.

    Jim
     


  18. AaronHPMC

    AaronHPMC

    Joined Aug 26, 2013
    24 posts, 0 likes
    Catalina 30 MKII
    Ca Horseshoe Bay
    I would have done a video clip trying to show the noise difference, but I don't think it would do justice. I am sure you won't be disappointed! Having already had sound deadening put in and soft engine mounts, there would only be one place left for noise. The engine is now so much quieter, during cruise speed especially (2500rpm) that if I go inside I can hear the electric lift pump ticking away... :)
     


  19. acox271929

    acox271929

    Joined Oct 13, 2011
    13 posts, 0 likes
    Catalina 30 MkII
    US Lake Murray, SC
    So you just took a section of hose and attached it to the engine where the air filter is normally attached. Then you hooked the new air filter to the other end of hose and routed it out of the way. So the new air filter is some distance 18" to 25" from the engine. My air filter has nothing inside of it. Let me know if this is correct. Thanks for the idea !
     


  20. AaronHPMC

    AaronHPMC

    Joined Aug 26, 2013
    24 posts, 0 likes
    Catalina 30 MKII
    Ca Horseshoe Bay
    That's exactly what I did. The air cleaner from the kubota L245 is fairly compact and quiet.
     




Ready-made sheets and halyards
Now faster than ever, our calculator tells you what sizes you need.
Gray Enterprises port gasket
Stop winter leaks. Compare our price!
Mainsail covers
Pre-patterned mainsail covers to fit your boat
Stainless documentation placard
Who said a documentation placard cant be beautiful? Brushed stainless with laser-fused numerals.