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35708RE: [SabreSailboat] Cowl Vents - 4" with a little extra work?

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  • Ken Jenkins
    Jan 1, 2012
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      John,

      As a side question, did you have much trouble getting the mounting plate for the Martec vent off? I also have a 34 MkII andI had unscrewed one earlier this Fall to check hole size, but could not seem to pull out the mounting plate. I thought maybe it had been bedded with an adhesive. Having limited time, I decided to put off really working on the problem.

      Thanks for any insight, Ken

       


      From: Sabresailboat@yahoogroups.com [mailto: Sabresailboat@yahoogroups.com ] On Behalf Of JohnF
      Sent: Sunday, January 01, 2012 6:13 AM
      To: Sabresailboat@yahoogroups.com
      Subject: [SabreSailboat] Cowl Vents - 4" with a little extra work?

       

       

      The old original Martec cowl vents were removed yesterday on our 1987 34 MkII (thank you 55 degree Maryland weather!). In reviewing the archives, it looks like most people have replaced with 3" cowl vents, often requiring a teak or starboard 'pad' to accommodate a smaller deck ring.

      Has anyone gone to the effort to slightly modify the dorade box to install 4" vents? The holes in my deck are 3 11/16 inches, somewhat bigger than is needed for a 3" vent, and slightly smaller than is needed for a 4" vent.

      It's tempting -- the 4" vents are only an inch taller (so I don't think they would look out of scale), but have 40% more air flow capacity (based on Vetus catalog).

      I don't see any references to this approach, so am suspecting that there is a hidden 'gotcha !!!'.

      Thanks -

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