sqpilot@earthlink wrote:
My 13b engine is ready to run....I ordered a VAM muffler, but since it
has
not yet happened, I was wondering if I could get away with using the
stock
cast iron manifold with a straight pipe attached to it, which would exit
through the bottom of the cowling. I should mention that this is on a
pusher. George Graham told me that he was using a straight, (or slightly
bent) pipe, and possibly Perry Mick is or was using the stock cast iron
manifold? My thinking is that although it is heavy, it might possibly
absorb a lot of the initial heat as it is exiting the exhaust ports,
acting
like a heat collector, and I might not need expensive inconel or 321
stainless after the exhaust goes through the stock manifold first? Would
the cast iron manifold absorb much of the heat and possibly muffle some
of
the noise as it is bounced around inside of the stock manifold? I'm
probably grasping at straws, but with all the knowledge and experience in
this group, I figure it wouldn't hurt to ask. Thanks to all for your
opinions and advice. Paul Conner, 13b powered SQ2000
Yes I still use the stock exhaust manifold. It takes all the heat abuse.
I have a short pipe made from standard automotive stuff at a muffler
shop, it shows no sign of wear after 5 years and 440 hours because the
cast iron takes the direct hit. No stainless or iconel or anything
special. You want to be sure to keep the heatshields on.
--
Perry
Thank you very much, Perry....I might just be on to something here. The
heat shields you are referring to ....are these Mazda heat shields, or
home-brew? Any pictures? Thanks again. If I go this route, engine start
can be next week. Paul Conner
The heat shields bolt onto the exhaust manifold, there are two of them. They are very light, I think they are very thin sheet steel with a fiberfrax type material on the inside held in place by a perforated sheet of metal. They are very effective at keeping the heat from radiating to the suroundings. I suppose you could make your own, or try a junkyard. They should have been attached to the exhaust manifolds, where did you get your manifolds?
Perry
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