michael.cowan(at)lmco.com
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 Posted: Mon Mar 21, 2011 5:58 am Post subject: EXTERNAL: Re: Rotax 912 exhaust pipe cracks |
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I think I have some pix of your exhaust but if you’re offering, yes please send them on.
Thanks,
Mike Cowan
From: owner-pulsar-list-server(at)matronics.com [mailto:owner-pulsar-list-s erver(at)matronics.com] On Behalf Of David Weaver
Sent: Sunday, March 20, 2011 12:12 PM
To: pulsar-list(at)matronics.com
Subject: EXTERNAL: Re: Rotax 912 exhaust pipe cracks
I had similar cracking problems with Aero Designs mild steel and Sky Star's stainless steel systems on my Pulsar XP. I decided to go for maximum efficiency by reducing exhaust system weight and heat dissipating area in the engine compartment. I had Aircraft Exhaust, Inc. build a straight pipe system from a PVC pipe mock-up. There is no exhaust cans in my system. The exhaust pipes exiting the lower cowl are capped on the ends with a series evenly spaced 3/16 holes around the periphery of each pipe. What I have done is to move the exhaust can baffle outside o f the engine compartment less the can. I monitored both cylinder EGT and back pressure to experimentally determine how many holes to make. I used a long tapered punch to pull flutes in the stainless steel. The result was 3.1 pounds weight per side with slightly increased exhaust noise. I have short transverse pipe runs (about 3 inches from bottom of fuselage) and no measurable increase in drag. I also have no exhaust stains on the bottom of the fuselage. I have less than 100 hours on the system with no signs of cracking or loosening at the manifold connection points. I can provide pictures if needed.
Dave Weaver N912GR
--- On Sun, 3/20/11, Alex Kozloff <avkozloff(at)roadrunner.com> wrote:
| Quote: |
< br>From: Alex Kozloff <avkozloff(at)roadrunner.com>
Subject: Pulsar-List: Rotax 912 exhaust pipe cracks
To: pulsar-list(at)matronics.com
Date: Sunday, March 20, 2011, 12:15 PM
--> Pulsar-List message posted by: "Alex Kozloff" <avkozloff(at)roadrunner.com>
Gentlemen:
A few years ago there was a spate of Pulsar II and III exhaust pipe cracks that was somehow resolved.
I remember some discussion regarding replacing the mild steel pipes that came with the engine with Stainless Steel ones.
Could anyone please refresh our minds with the the details of this problem and how it was resolved?
Thank you,
--Alex Kozloff
Pulsar I
N190AKhttp://www.matronics.com/Navigator?P & nbsp;- MATRONICS WEB FORUM; ="http://www.matronics.com/contribution" target=_blank>http://www.matro=====================
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