Once you get your system built, take it and get it plated and it will last
forever. Nickel chrome or some other and it shouldn't be that expensive but
might be worth checking into.
Ron
From: Mark Langford via KRnet <[email protected]>
To: KRnet <[email protected]>
Cc: Mark Langford <[email protected]>
Sent: Saturday, January 28, 2017 8:56 AM
Subject: Re: KR> 4-into-1 exhaust system help?
I gave up trying to find an exhaust system that even vaguely resembles
what I have on N891JF. I'm going to have to build another one that
replicates it, unless I want to remove the engine, completely
reconfigure the firewall and intake system, etc. Building a new system,
as painful as that sounds, is easier than the alternative.
I was going to build it out of 321 stainless until I checked the prices.
A 321 U-bend is $94, a 304 U-bend is $40, and a mild steel U-bend is
$10. I need 8 U-bends (four are actually J-bends, but same price), just
to think about getting started, we're talking $800, not to mention
collector, tailpipe, flanges, etc, if built from 321 stainless. The
existing one made it to 600 hours and was mild steel. I'll have N56ML
back in the air before I put another 600 hours on this one!
By contrast, my Corvair system was almost reasonable built from 321,
because it is built so simply using only three U-bends for six
cylinders. But it's not a complex 6-into-1 system either, just a pair
of simple 3-into-1 pipes.
I have everything I need to start on it, and that's what I'm doing all
weekend, and probably next weekend as well. I built two mockup engines,
one with the old exhaust to measure distances and angles from, and the
other as the fixture to build the new system onto. We'll see how it goes.
One thing I learned along the way is that Great Plains has no exhaust
systems built, but they do have fixtures, so they are "to order" with a
30 day lead time. The configurations are shown on their website at
http://greatplainsas.com/scexhaust.html , none of which are similar to
mine. Also, gauge size is not mentioned on their website, but they are
18g (.049"), rather than the 16g (.065")like the original exhaust
system, so I had to get all materials elsewhere. I did buy flanges from
them, but am not enamored with them as the mounting holes are huge
compared to the 8mm studs, so I'll have to carefully center the flanges
to the ports before I start welding tubes to them.
Mark Langford
[email protected]
http://www.n56ml.com
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