On the question of pipe bends, why for an intake manifold does it need
to
be
heat treated? it is low stress.
Second question, how do you heat treat the '0' condition burns bends --
I
used them for the cooling system.
Bill Schertz
KIS Cruiser #4045
Nothing on my end Bill. I send everything to myself and I see no changes.
Pic file size varies so that could be a factor with AOL.
Aluminum in the O state is extremely soft and can be damaged very very
easily.
Especially when you start talking about thin wall tubing.
I am not familiar with the heat treating process. Burns buy it in the T6
state
and have it normalized to O and then bend it. Then they sent it out to
have
it heat treated again. I notice in the latest catalog they no longer do
that.
Probably to save money. Are you sure you have condition O?
Bill;
6061 in annealed condition (O) is still stronger than 3003 normally used
for fuel line and other uses, and should be fine for cooling system and,
I'd
guess, for intake runners as well if they are not supporting something
else.
Any time you weld 6061 T-6 you end up with O condition in the region of
the
weld anyway. Getting it back to T-6 condition requires solution heat
treating and artificial aging, which can be done your local heat treating
shop. It cost me about $200 to get my intake manifold back to T-6 after
having it welded up. In my configuration the manifold supports the
throttle
body.
Al
Small diameter fuel line is one thing. Large diameter intake tubing yet
another.
In my experience condition O 6061 2 inch tubing is easily dented and
distorted.
The weld on the other hand is a very small area. It will work however
if properly supported.
Paul Lamar
Vaughn Mann wrote:
Paul,
Just curious, I have a corporation not to far from here that deals with all
sorts of titanium manipulation in the Morristown TN area. I can't remember
the name of them at the moment but I'll find out if needed. What's your
opinion on using titanium instead of aluminum for this?
I know it's light compared to other steel.
Temp. isn't a problem.
This company specializes in bending titanium I think, I'll have to make
sure.
Cost is a lot more but may be worth it.
Two concerns is two different metals being not only welding together at such
different melting temps but corrosion problems with dissimilar metals?
Would bonding work, or press fit?
What's your opinion? Thanks, Vaughn.
Sure, I guess you could bond it but IMHO the cost does not justify the weight
savings if any over aluminum. As Al pointed out this is not a highly stressed
part. On the other hand you don't want to make it too weak. Most cars
now a days are using injected molded nylon or some other thermo plastic
for intake manifolds and that includes the new RX8.
Paul Lamar
The AirCraft Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/
Copyright 1998-2002 All world wide rights reserved.