Re: [OMC-Boats] cowling venting

From: Gregory B. Fell <gfell@...>
Date: Tue, 22 Jul 2008 10:49:46 -0500
The fumes are much heavier than the air.  That's why your blower should be in the lowest position in the bilge.

Gregory B. Fell
The Fell Law Firm
3300 Oak Lawn Avenue, Suite 700
Dallas, Texas 75219
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JEFF DOOD wrote:
AH - ok, makes sense now.   although diminishing noise seems to be the  
least concern with about 1/2 the boats i see (hear) at the boat ramp  
every time.

and so if the thing on top is a spark arrestor, not an air cleaner,  
where do these engines get their air for combustion - shouldn't there  
be an intake somewhere?   not disputing, just wondering

so i guess i could put a grill in my cowling, and it would just be  
louder and maybe a little less likely to explode on starting due to  
better fume venting.    but it won't run any cooler!

actually another question - are gas fumes heavier than air?       if  
so, where i want to put the vent won't help the fumes at all.   either  
way, i always run the blower regardless.

On Jul 22, 2008, at 7:03 AM, D. F. Julien, AIA wrote:

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  
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
- 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  
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  
having to rely on the blower.

I have a perfect spot right on the front of the cowling for a nice  
chrome vent, but i don't want to be cutting any holes without knowing
for sure first.

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