Re: [OMC-Boats] cowling venting

From: D. F. Julien, AIA <dfjulien@...>
Date: Tue, 22 Jul 2008 09:03:46 -0500

Hi Jeff

Engine noise is probably the reason for the tight compartment. If you put a
grille in the back cowling, facing forward, you'd greatly increase your
awareness of the engine noise.

Not that it changes your argument, but that round thing on top of the
carburetor is a spark arrestor, not a filter. I guess the presumption is
that boats don't go down dusty roads much during operation.

-Doug Julien

----- Original Message -----
From: "JEFF DOOD" <jdood@...>
To: "Evinrude & Johnson Boats of the 1960's and 70's"
Sent: Tuesday, July 22, 2008 12:19 AM
Subject: [OMC-Boats] cowling venting

> kind of inexperienced with boat i/o motors. here's something i
> don't get.......why no venting in the cowling? i happen to have a
> Deluxe, but i think it's the same story with other boats as well.
> - You are supposed to vent the fumes out with a blower before
> starting.
> - the top of the carb has an air cleaner intake just like a car
> (although small)
> yet my particular cowling seals up pretty tight and seems like it's
> designed to not let any air get in. it does have a smaller grill in
> the back of the engine compartment, but minimal. So why aren't
> cowlings (or atleast mine) vented like crazy with air grills all over
> the place? it just seems like it would A) make the engine run better
> by providing more available fresh air intake, B) make the engine run
> even cooler with air flow taking away some of the heat , and C) make
> it easier for the accumulating fumes to get out of the cowling without
> having to rely on the blower.
> I have a perfect spot right on the front of the cowling for a nice big
> chrome vent, but i don't want to be cutting any holes without knowing
> for sure first.
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Received on Tuesday, 22 July 2008

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