Intake plenum

I'm thinking about making a carb. heat plenum for my plane out of
fiberglass ( epoxy.) I had done it once for my Quickie many years
ago because that's what what the plans said to do. But that was a
very small plenum. Due to space constraints, it would be very easy to
make it out of fiberglass for my new project ( 120 h.p.) but I'm
wondering if the carb heat would be too hot for the fiberglass. I
will make it out of aluminum if I have to, but it would be harder to
do. Do you think the fiberglass would work? Thanks

Neal

On Sat, 3 Apr 2010 12:52:03 -0700 (PDT), Neal Fulco
wrote:

I'm thinking about making a carb. heat plenum for my plane out of
fiberglass ( epoxy.) I had done it once for my Quickie many years
ago because that's what what the plans said to do. But that was a
very small plenum. Due to space constraints, it would be very easy to
make it out of fiberglass for my new project ( 120 h.p.) but I'm
wondering if the carb heat would be too hot for the fiberglass. I
will make it out of aluminum if I have to, but it would be harder to
do. Do you think the fiberglass would work? Thanks

Neal
Nope. Fiberglass (unless you are getting ito really exotic resins)
won't handle the heat.

On 4/3/2010 8:28 PM, wrote:
On Sat, 3 Apr 2010 12:52:03 -0700 (PDT), Neal
wrote:

I'm thinking about making a carb. heat plenum for my plane out of
fiberglass ( epoxy.) I had done it once for my Quickie many years
ago because that's what what the plans said to do. But that was a
very small plenum. Due to space constraints, it would be very easy to
make it out of fiberglass for my new project ( 120 h.p.) but I'm
wondering if the carb heat would be too hot for the fiberglass. I
will make it out of aluminum if I have to, but it would be harder to
do. Do you think the fiberglass would work? Thanks

Neal
Nope. Fiberglass (unless you are getting ito really exotic resins)
won't handle the heat.


90 degrees above ambient?

200 max?

--

Richard Lamb
http://www.home.earthlink.net/~cavelamb/

On Sat, 03 Apr 2010 21:54:40 -0500, cavelamb ""cavelamb\"@ X
earthlink.net" wrote:

On 4/3/2010 8:28 PM, wrote:
On Sat, 3 Apr 2010 12:52:03 -0700 (PDT), Neal
wrote:

I'm thinking about making a carb. heat plenum for my plane out of
fiberglass ( epoxy.) I had done it once for my Quickie many years
ago because that's what what the plans said to do. But that was a
very small plenum. Due to space constraints, it would be very easy to
make it out of fiberglass for my new project ( 120 h.p.) but I'm
wondering if the carb heat would be too hot for the fiberglass. I
will make it out of aluminum if I have to, but it would be harder to
do. Do you think the fiberglass would work? Thanks

Neal
Nope. Fiberglass (unless you are getting ito really exotic resins)
won't handle the heat.


90 degrees above ambient?

200 max?
That is the minimum required
Can often be a lot hotter than that. Only isophthalic resin rated for
210F and Vynylester rated at 241F would even be close. None of the
common epoxies are rated for that temperature. You would need a
novolac based epoxy (special high temperature epoxy resin)

On Apr 3, 12:52*pm, Neal Fulco wrote:
I'm thinking about making a carb. heat plenum for my plane out of
fiberglass ( epoxy.) * I had done it once for my Quickie many years
ago because that's what what the plans said to do. *But that was a
very small plenum. *Due to space constraints, it would be very easy to
make it out of fiberglass for my new project ( 120 h.p.) but I'm
wondering if the carb heat would be too hot for the fiberglass. *I
will make it out of aluminum if I have to, but it would be harder to
do. *Do you think the fiberglass would work? *Thanks

Neal

On my Glasair, I have a composite plenum on the intake side of the
carb with a flapper valve to direct air. The plenum is actually part
of the cowl with a rubber gasket next to the carb. Don't know what
was used to make the part, but it's attached to the cowl with
vinylester. Seems to work OK.

Ed

wrote:

90 degrees above ambient?

200 max?
That is the minimum required
Can often be a lot hotter than that. Only isophthalic resin rated for
210F and Vynylester rated at 241F would even be close. None of the
common epoxies are rated for that temperature. You would need a
novolac based epoxy (special high temperature epoxy resin)

Thin some JBWeld. Squish it into the glass between sheets of cellophane
with a large socket or piece of pipe.

On Wed, 07 Apr 2010 19:56:31 -0400, Ernest Christley
wrote:

wrote:

90 degrees above ambient?

200 max?
That is the minimum required
Can often be a lot hotter than that. Only isophthalic resin rated for
210F and Vynylester rated at 241F would even be close. None of the
common epoxies are rated for that temperature. You would need a
novolac based epoxy (special high temperature epoxy resin)

Thin some JBWeld. Squish it into the glass between sheets of cellophane
with a large socket or piece of pipe.

A BADGE Resin (Bisphenol A DiGlycidyl Ether) resin is another one of
the special high temperature epoxy resins.

Good to about 500

On 4/7/2010 10:04 PM, wrote:
On Wed, 07 Apr 2010 19:56:31 -0400, Ernest Christley
wrote:

wrote:

90 degrees above ambient?

200 max?
That is the minimum required
Can often be a lot hotter than that. Only isophthalic resin rated for
210F and Vynylester rated at 241F would even be close. None of the
common epoxies are rated for that temperature. You would need a
novolac based epoxy (special high temperature epoxy resin)

Thin some JBWeld. Squish it into the glass between sheets of cellophane
with a large socket or piece of pipe.

A BADGE Resin (Bisphenol A DiGlycidyl Ether) resin is another one of
the special high temperature epoxy resins.

Good to about 500

Come on, guys!
How hot do you think the intake air can be and still have the motor run???

--

Richard Lamb
http://www.home.earthlink.net/~cavelamb/

On Wed, 07 Apr 2010 22:19:44 -0500, cavelamb ""cavelamb\"@ X
earthlink.net" wrote:

On 4/7/2010 10:04 PM, wrote:
On Wed, 07 Apr 2010 19:56:31 -0400, Ernest Christley
wrote:

wrote:

90 degrees above ambient?

200 max?
That is the minimum required
Can often be a lot hotter than that. Only isophthalic resin rated for
210F and Vynylester rated at 241F would even be close. None of the
common epoxies are rated for that temperature. You would need a
novolac based epoxy (special high temperature epoxy resin)

Thin some JBWeld. Squish it into the glass between sheets of cellophane
with a large socket or piece of pipe.

A BADGE Resin (Bisphenol A DiGlycidyl Ether) resin is another one of
the special high temperature epoxy resins.

Good to about 500

Come on, guys!
How hot do you think the intake air can be and still have the motor run???
I forgot to say JB Weld is a BADGE resin- which is why I mentioned
it.

"cavelamb" ""cavelamb\"@ X earthlink.net" wrote in message
m...
On 4/7/2010 10:04 PM, wrote:
On Wed, 07 Apr 2010 19:56:31 -0400, Ernest Christley
wrote:

wrote:

90 degrees above ambient?

200 max?
That is the minimum required
Can often be a lot hotter than that. Only isophthalic resin rated for
210F and Vynylester rated at 241F would even be close. None of the
common epoxies are rated for that temperature. You would need a
novolac based epoxy (special high temperature epoxy resin)

Thin some JBWeld. Squish it into the glass between sheets of cellophane
with a large socket or piece of pipe.

A BADGE Resin (Bisphenol A DiGlycidyl Ether) resin is another one of
the special high temperature epoxy resins.

Good to about 500

Come on, guys!
How hot do you think the intake air can be and still have the motor run???

--

Richard Lamb
http://www.home.earthlink.net/~cavelamb/


I was really wondering about that as well--and also doubting the required
strength...

Peter