Intake manifold construction

[BamaInstrument]

Yep, I saw an article that stated that underhood heat can easily go over 300
degrees F after a shutdown.  The timing was retarded to determine if the
heat source was headers and the temperature went into the mid 300 degree F
range.

Also, it seems that older cars which have engine ventilation higher in
relationship to the engine have less trouble.  When setting and not running
the heat seems to come out of the radiator opening in older cars.

dh


----- Original Message -----
From: "Seth" <sethea at mediaone.net>
To: <diy_efi>
Sent: Thursday, April 13, 2000 11:34 PM
Subject: Re: Intake manifold construction


> The DGEBA epoxy you are likely to use is not good for much over 100
> degrees C. You could get a tooling epoxy, but even that is probably not
> any good at 150C.  If you could get a flange of steel or aluminum and
> extend it up a few inches, then graft on a plenum and runners of glass
> and epoxy, that might keep the plenum cool enough. If it's a crossflow
> head, then the intake will be cooler. If it's a single port face head,
> then you may still encounter heat problems.  You might consider a
> phenolic/glass composite flange, then graft on the runners and plenum.
> The phenolix matrix will put up with the heat, and won't conduct enough
> to do the epoxy/glass any harm, IMHO.  There is still the issue of
> underhood convection at shutoff, however.
>
> -Seth
>
> Sean W Walsh wrote:
> >
> > Can anyone give me a reason why I shouldn't construct an intake manifold
using
> > Glass Reinforced Plastics?
> >
> > I have an older 4 cyl lancia engine with a dual throat single carby and
4 branch
> > manifold. I'm converting this to EFI and want to create a port injection
rampipe
> > style intake with a small plenium etc. GRP lends itself to "backyard"
techniques
> > and since I have a bit of experience with boat construction I thought
I'd give
> > it a go myself rather than getting something fabricated.
> >
> > What are the problems I'm likely to face : different temperature
expansion rates
> > of the inlet manifold (grp) and the head (alloy)?  fatigue from
vibration? high
> > temperatures breaking down the epoxy?  I know there are epoxy resins
available
> > that are rated to 150 degrees celsius so that should be enough (?) any
other
> > suggestions?
> >
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