[C320-list] Noise Problem with Perkins Engine

[Jeffrey Hare]

Hi Bob,

   Adding insulation doesn't really have much (if any) effect on the ambiant
temp of the engine compartment contrary to what you might think.

   The engine produces quite a bit of heat, but if you think about it, the
raw water/heat exchanger/fresh water cooling system is responsible for
transferring all the excess heat from the engine block to the exhaust water
and out the "tail pipe".  

   The air in this compartment gets sucked into the air intake anyway and is
replaced by whatever air finds its way into the compartment from the spaces
below.  (Now, there's a system that needs improvement)  

   The engine covers are not meant to transfer heat out to the cabin, so
adding sound deadening insulation only amounts to softening the harshness of
the engine noise.  FYI:  It makes a big difference, I noticed that
immediately when you started your engine this weekend...

   Bottom line,  don't worry about it.  The engine block itself runs at
~180, so unless the engine itself is overheating, the compartment is
typically less than 200 degrees regardless of how long you motor and whether
you have 6" of insulation or none.

Hope this helps.

-JeffH

-----Original Message-----
From: Robert Seastream [mailto:seastream at adelphia.net] 
Sent: Monday, July 10, 2006 3:10 PM
To: C320-List
Subject: Re: [C320-list] Noise Problem with Perkins Engine

I agree that diesels are loud, but that's the nature of the beast.  I'm  
reluctant to add soundproofing because I don't want to raise the  
ambient temperature in the engine compartment higher than it already  
is.

Bob Seastream
Intuition, Hull 906


On Jul 10, 2006, at 8:44 AM, amshd2 at aol.com wrote:

> i have a 94 320 with the Perkins... i had the same problem ... so last  
> year i installed the w/m 1 in sound proofing...... that made a big  
> difference ...  next i got some 1/4 in foam gasket material from  
> Soundowner for the edges around the eng covers ........   I also got  
> some of what they call, acoustical mat which i placed over the access  
> boards in the aft berth......  now you can have a normal conversation  
> in the boat
>
> the guys at Soundowner are great to work with and they have a great  
> web site on ways to reduce sound and vibrations........
>
> Tony
>
>
>
> -----Original Message-----
> From: Greg Battersby <gjbattersby at probatter.com>
> To: C320-List at catalia 0.org
> Sent: Sun, 9 Jul 2006 11:23:26 -0400
> Subject: [C320-list] Noise Problem with Perkins Engine
>
>
> This is my first year with a 320, having previously had a Catalina 30  
> and an
> Ericson 26 both of which had inboards.  It's a '95 320 with a Perkins
> inboard and is, by far, the loudest engine we've ever had.  On one  
> long run
> with no wind where we were running the engine for a few hours, it got  
> so bad
> that we actually closed up the cabin which did somewhat reduce the  
> noise
> level.
>
>
>
> Is this problem unique to our boat or are others also experiencing it?  
>  Any
> suggestions for eliminating or minimizing it?  One thought was to  
> insulate
> the engine compartment with sound deadening insulation.  Any thoughts  
> or
> suggestions would be appreciated.
>
>
>
> Greg Battersby
>
> Windeage #210
>
> 1995 C-320
>
> Westport, CT
>
>
>
>
>
>
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