 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
Mike Hoffman
Joined: 11 Mar 2006
Posts: 54
|
 Posted: Fri Oct 23, 2009 2:20 am Post subject: Cowling Burnt by Exhaust |
 |
|
This is a heads up when installing your cowling. Pay attention to the clearance between the exhaust pipes and cowling at the forward most point.
After 7 hours of engine run time I have noticed the paint on the outside of the cowling starting to blister about the size of a quarter. When I installed the cowling I thought I had ample clearance (about 1 1/2 inches) but I found the exhaust starting to burn the cowling on the inside.
This could have a disastrous effect if the cowling got hot enough to start a fire. I have now wrapped both pipes (at the front ) with heat wrap exhaust tape and put heat reflective pads on the inside of the cowling for additional protection as well. These materials were bought from Summit Racing and were not very expensive.
I have only run the engine on the ground for about 3/4 of am hour and and seems to be the solution. I was called out of town for work and will continue to put more time on it when I return.
Anyone else have this problem?
Mike Hoffman
| | - The Matronics Zenith701801-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith701801-List |
|
|
|
| Back to top |
|
 |
mksoucy(at)yahoo.com
Guest
|
| Posted: Fri Oct 23, 2009 2:54 am Post subject: Cowling Burnt by Exhaust |
|
|
I would also make sure the engine is not running to lean
Mike
Sent from my iPod
On Oct 23, 2009, at 6:20 AM, "Mike Hoffman" <mhoffman9(at)tampabay.rr.com> wrote:
This is a heads up when installing your cowling. Pay attention to the clearance between the exhaust pipes and cowling at the forward most point.
After 7 hours of engine run time I have noticed the paint on the outside of the cowling starting to blister about the size of a quarter. When I installed the cowling I thought I had ample clearance (about 1 1/2 inches) but I found the exhaust starting to burn the cowling on the inside.
This could have a disastrous effect if the cowling got hot enough to start a fire. I have now wrapped both pipes (at the front ) with heat wrap exhaust tape and put heat reflective pads on the inside of the cowling for additional protection as well. These materials were bought from Summit Racing and were not very expensive.
I have only run the engine on the ground for about 3/4 of am hour and and seems to be the solution. I was called out of town for work and will continue to put more time on it when I return.
Anyone else have this problem?
Mike Hoffman
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 69033#269033
| | - The Matronics Zenith701801-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith701801-List |
|
|
|
| Back to top |
|
|
n801bh(at)netzero.com
Guest
|
| Posted: Fri Oct 23, 2009 5:58 am Post subject: Cowling Burnt by Exhaust |
|
|
I have commented on this a few times.. Remember guys, when the EGT gauge says the temp is 1400+f that is HOT... I have taken a IR temp gun and read the numbers off a stove top burner on my electric stove. When glowing red hot it registers 1450f. We all know you can't hold your hand close to this for even a second so when designing your firewall forward set up keep this in mind... Moral of the story is radiant heat needs to be dealt with properly.
do not archive
Ben Haas
N801BH
www.haaspowerair.com
--------
| | - The Matronics Zenith701801-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith701801-List |
|
|
|
| Back to top |
|
|
larry(at)macsmachine.com
Guest
|
| Posted: Fri Oct 23, 2009 7:07 am Post subject: Cowling Burnt by Exhaust |
|
|
Yes Mike,
I tried to burn up my cowling in the first run ups and had to change
materials and also wrap the pipes.
Your exhaust needs to be 3/4-inch or more clear of the cowling, and when
its even that close it's a good idea to put in an aluminum
piece to get more clearance, like a bump-out or half tube like the one
seen on my cowling. The front end is open and allows air to
make the exhaust pipe area even cooler. A flange riveted behind each
side can be blended in with the fiberglass without problems.
Hard to even see them after you've painted.
http://www.macsmachine.com/images/completion/full/radforwardfront.gif
http://www.macsmachine.com/images/cowling/full/cowlfairingsinside.gif
http://www.macsmachine.com/images/completion/full/601ezclosefrtrt.gif
Larry McFarland 601HDS at www.macsmachine.com at 147 hours
Mike Hoffman wrote:
| Quote: |
This is a heads up when installing your cowling. Pay attention to the clearance between the exhaust pipes and cowling at the forward most point.
After 7 hours of engine run time I have noticed the paint on the outside of the cowling starting to blister about the size of a quarter. When I installed the cowling I thought I had ample clearance (about 1 1/2 inches) but I found the exhaust starting to burn the cowling on the inside.
This could have a disastrous effect if the cowling got hot enough to start a fire. I have now wrapped both pipes (at the front ) with heat wrap exhaust tape and put heat reflective pads on the inside of the cowling for additional protection as well. These materials were bought from Summit Racing and were not very expensive.
I have only run the engine on the ground for about 3/4 of am hour and and seems to be the solution. I was called out of town for work and will continue to put more time on it when I return.
Anyone else have this problem?
Mike Hoffman
|
| | - The Matronics Zenith701801-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith701801-List |
|
|
|
| Back to top |
|
|
Mike Hoffman
Joined: 11 Mar 2006
Posts: 54
|
| Posted: Sat Oct 24, 2009 2:32 am Post subject: Re: Cowling Burnt by Exhaust |
|
|
Thanks Ben and Larry. Larry, thanks for the photos, I like your ideas.
Mike H
| | - The Matronics Zenith701801-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Zenith701801-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
