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
PHN: 972-488-8177
FAX: 214-219-4218
GFELL@...
The Fell Law Firm
3300 Oak Lawn Avenue, Suite 700
Dallas, Texas 75219
PHN: 972-488-8177
FAX: 214-219-4218
GFELL@...
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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 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" <omc-boats@...> Sent: Tuesday, July 22, 2008 12:19 AM Subject: [OMC-Boats] cowling ventingkind 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. _______________________________________________ OMC-Boats mailing list OMC-Boats@... http://lists.ultimate.com/mailman/listinfo/omc-boats_______________________________________________ OMC-Boats mailing list OMC-Boats@... http://lists.ultimate.com/mailman/listinfo/omc-boats_______________________________________________ OMC-Boats mailing list OMC-Boats@... http://lists.ultimate.com/mailman/listinfo/omc-boats No virus found in this incoming message. Checked by AVG - http://www.avg.com Version: 8.0.138 / Virus Database: 270.5.4/1566 - Release Date: 7/22/2008 6:00 AM
