What type of epoxy should I when I port my TB?
08-20-2002, 11:44 PM
#3
Re: What type of epoxy should I when I port my TB? Since I port them I'll give you a few hints.
1. Make sure it can handle higher heat
2. Make sure it does not shrink
3. If you drill holes into it for the IAC and PCV then make sure it's machineable.
4. It has to bond with aluminum.
Mine is an industrial grade epoxy that I also use in intake manifolds, so it's not something you can find anywhere.
Other things to watch out for is to make sure you do not touch the area around the throttle plate with the grinder when you are cutting the lip out, that will screw up the TB bad. Boreing the lip out with a machine made to bore holes will help alot too.
Good Luck
Bret
<small>[ August 20, 2002, 11:45 PM: Message edited by: SStrokerAce ]</small>
1. Make sure it can handle higher heat
2. Make sure it does not shrink
3. If you drill holes into it for the IAC and PCV then make sure it's machineable.
4. It has to bond with aluminum.
Mine is an industrial grade epoxy that I also use in intake manifolds, so it's not something you can find anywhere.
Other things to watch out for is to make sure you do not touch the area around the throttle plate with the grinder when you are cutting the lip out, that will screw up the TB bad. Boreing the lip out with a machine made to bore holes will help alot too.
Good Luck
Bret
<small>[ August 20, 2002, 11:45 PM: Message edited by: SStrokerAce ]</small>
08-21-2002, 09:33 AM
#5
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Re: What type of epoxy should I when I port my TB? JB-weld will definitely take the heat you'll
see. Some epoxies won't, especially the clear
"5-minute" types. It seems that the faster
they cure, the less stable they are.
That being said, one thing that's bad about
many epoxies (including JB-weld) is that they
slump (liquid, not a paste with any body to it).
So it may be hard to fill the ports in one
sitting, unless you make a clay dam or something
like that. You want enough excess that you can
grind it back flush, right? Clay, hot glue,
anything that'll stick, and not leave cheese
in the places where you want adhesion.
The "filler" type epoxies (Metal Mend etc.)
have more of a paste consistency and are meant
for filler use. They will be more mechanically
strong and stable than a filler-less epoxy.
I believe JB-weld has some metal filler in it,
but this is just dim recollection of reading
the package. More important to my thinking is
the adhesion quality. I'd be suspicious of
any of "metal mend" glues unless you have a
strong recommendation; a lot of the packaging
makes ridiculous claims that make me distrust
the products within. And nobody guarantees
that their glue will actually stick (at
least, not anybody who sells glue in a $3.99
blister pack).
On the plus side, the metal-filled ones look
nicer.
I would (and will, when I find a TB to try
my hand on) drill some cross-holes and put
some "safety wires" across inside the ports to be
filled; the epoxy will seal and keep the wires,
the wires will make sure that should the epoxy
lose grip, it won't go anywhere.
see. Some epoxies won't, especially the clear
"5-minute" types. It seems that the faster
they cure, the less stable they are.
That being said, one thing that's bad about
many epoxies (including JB-weld) is that they
slump (liquid, not a paste with any body to it).
So it may be hard to fill the ports in one
sitting, unless you make a clay dam or something
like that. You want enough excess that you can
grind it back flush, right? Clay, hot glue,
anything that'll stick, and not leave cheese
in the places where you want adhesion.
The "filler" type epoxies (Metal Mend etc.)
have more of a paste consistency and are meant
for filler use. They will be more mechanically
strong and stable than a filler-less epoxy.
I believe JB-weld has some metal filler in it,
but this is just dim recollection of reading
the package. More important to my thinking is
the adhesion quality. I'd be suspicious of
any of "metal mend" glues unless you have a
strong recommendation; a lot of the packaging
makes ridiculous claims that make me distrust
the products within. And nobody guarantees
that their glue will actually stick (at
least, not anybody who sells glue in a $3.99
blister pack).
On the plus side, the metal-filled ones look
nicer.
I would (and will, when I find a TB to try
my hand on) drill some cross-holes and put
some "safety wires" across inside the ports to be
filled; the epoxy will seal and keep the wires,
the wires will make sure that should the epoxy
lose grip, it won't go anywhere.
