RE: [omc-boats] venting the cowling

Tom,

I've just done the same thing. I separated the top deck from the hull and
then stripped everything off. My floor was absolutely rotten to the point
of crumbling into little bits when I tried pulling it up. I ended up using
a flat shovel for most of it. The foam underneath was cracked in many
places. It wasn't heavily saturated with water, but it had "layers" of
water in areas and "spots" where there had been fasteners in the floor. I
even ended up cutting open the top of the stringers to remove the foam
because they had some water inside as well. There was a layer about 1/2"
thick on most of the sides and bottom.

Right now my hull is completely empty of any foam. It's very flexible in
this state and I can see how the foam is integral to it's structural
design. I'm researching in my area for foam product and technique options
as well as plywood. There's a fibreglass shop next door to my work so I'm
going to go and pay them a visit. I might be lucky and get a deal for them
to do the foaming and glassing work. At the least I should get some good
advice.

Here's a link to the foam that David Hanson used for his project. We need
the 4lb foam due to the structural requirements.
http://www.shopmaninc.com/foam.html

BTW - I have taken a lot of pictures of the work so far. When it's all
done I might have a good collection to send to Phil for a "Floor and foam
replacement gallery".

Regards,
Greg

-----Original Message-----
From: Tom Paquette [SMTP:tpaquette@...]
Sent: Tuesday, September 12, 2006 5:10 PM
To: omc-boats@...
Subject: RE: [omc-boats] venting the cowling

David,

I do have a question then that you maybe able to answer.

Do you know what density of foam was used/should be used. Under the floor?

I have stripped the hull clean and am trying to figure out if I need 4 lb
foam or what.

Thanks!!

Tom

Charlotte, NC

  _____

From: owner-omc-boats@... [mailto:owner-omc-boats@...] On
Behalf Of David
Sent: Tuesday, September 12, 2006 2:46 PM
To: omc-boats@...
Subject: Re: [omc-boats] venting the cowling

No, I was not an engineer - I assembled prototypes, worked on molds to
build
prototype hulls etc. then took them out for testing etc. very interesting
job but I was there for only a year - then got married and moved away - but
at least I got all the training etc. - even have my Certified OMC
Mechanic's
certificate. Dave

jdood wrote:

Wow - so you were an engineer at OMC back in the day?! I love this list!
(I have so many questions about my boat.....in time).

-----Original Message-----
From: owner-omc-boats@... [mailto:owner-omc-boats@...] On
Behalf Of David
Sent: Tuesday, September 12, 2006 8:57 AM
To: omc-boats@...
Subject: Re: [omc-boats] venting the cowling

Probably never noticed it - during my stint in engineering at OMC I ran a
lot of hours testing on Lake Michigan - there were several other OMC's out
on endurance that ran everyday - I do not recall ever seeing anyone run
with
the engine cover off - so it is likely no one ever had the chance to notice
the difference - Dave

jdood wrote:

So if the engine runs better with vents, now I am wondering why they
didn't put them in originally? Noise? Or is there some special
marine/safety issue with venting it?

-----Original Message-----
From: owner-omc-boats@... [mailto:owner-omc-boats@...]
On Behalf Of David
Sent: Tuesday, September 12, 2006 6:21 AM
To: omc-boats@...
Subject: Re: [omc-boats] venting the cowling

It wouldn't hurt anything to put a vent in - but I think I would put it
on the port side of the cowling - where the carb is located since you
wouldn't see it there - Dave

jdood wrote:

I have a 65 omc deluxe i/o that I know little about. I have been
finding that it seems to be running better without the cowling on the
engine. Perhaps my imagination, but I don't think so. So did those
cowlings ever have vents in that nice flat section of the front that
seems perfect for a vent grill? Would I be screwing anything up to put
one in there? Those little grills in the back seem kind of useless.

Thanks for any comments!

jeff

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