Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

914 Backfiring

Matronics Email Lists Forum Index -> Europa-List

View previous topic :: View next topic

Author Message

hagargs(at)earthlink.net
Guest

Posted: Mon Mar 27, 2006 8:06 pm Post subject: 914 Backfiring

I have run the engine several times in the driveway.  This weekend I have run it fully cowled up to check temperatures.  Things looked good at leat for the length of time I ran it without disturbing the neighbors too much.  I had several comments to the fact that "at least its not as loud as a Harley". So I guess I am OK as there are several of them in the neighborhood.  Had to re-adjust the throttle stop to find a happy medium between having the choke circuit work upon starting and high rpm level required to keep the gearbox from chattering.  1700 rpm seems to be about it.



However the only fault discernable the 5 times or so that I ran it was that I got a  backfire of one loud pop every time I stopped the engine. This did not happen on the  previous  runs.  I stopped the engine per the Rotax tech"s suggestion of turning one mag off first  then killing the engine finally off the  remaining mag.  Has anyone seen this on their 914?  



I have posted some photos of N40SH A143 on the builder's log on the builder's gallery it is  the last album with 8 photos.   It is untitled as  I had some problems naming it.  Hope to be flying before it gets too hot.



Steve Hagar

A143 Mesa, AZ

Steve Hagar

hagargs(at)earthlink.net

- The Matronics Europa-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?Europa-List

Horizonspace(at)aol.com
Guest

Posted: Mon Mar 27, 2006 8:32 pm Post subject: 914 Backfiring

In a message dated 3/27/2006 10:07:13 P.M. Central Standard Time,  

hagargs(at)earthlink.net writes:



I have  run the engine several times in the driveway.  This weekend I have 

run it  fully cowled up to check temperatures.  Things looked good at leat for  

the length of time I ran it without disturbing the neighbors too much.  I  had 

several comments to the fact that "at least its not as loud as a Harley".  So 

I guess I am OK as there are several of them in the neighborhood.  Had  to 

re-adjust the throttle stop to find a happy medium between having the choke  

circuit work upon starting and high rpm level required to keep the gearbox  from 

chattering.  1700 rpm seems to be about it.



However the only  fault discernable the 5 times or so that I ran it was that 

I got a   backfire of one loud pop every time I stopped the engine. This did 

not happen  on the  previous  runs.  I stopped the engine per the Rotax  tech"s 

suggestion of turning one mag off first  then killing the engine  finally off 

the  remaining mag.  Has anyone seen this on their  914?  



I have posted some photos of N40SH A143 on the builder's  log on the 

builder's gallery it is  the last album with 8  photos.   It is untitled as  I had 

some problems naming  it.  Hope to be flying before it gets too hot.



Steve Hagar

A143  Mesa, AZ

Steve,

 

We always shut our 914 down by turning both mags off at the same  time.  The 

only time we got a backfire was when we were running too  lean.  The mags are 

timed differently so depending on which one you shut  down first, your engine 

may not be running with the proper mixture.  Also,  the owner's manual has 

this to say "Allow a cooling run of at least 1 min. as an  engine shut-off at 

high temperature is especially harmful for the turbo charger.  Carburizing oil 

might block the oil supply and firing in the muffler can  occur."

 

Tam

- The Matronics Europa-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?Europa-List

CraigEllison

Joined: 09 Jan 2006
Posts: 24
Location: Silverton, OR USA

Posted: Mon Mar 27, 2006 9:47 pm Post subject: 914 Backfiring

Steve,



Not sure I can be much help but I did get the same one loud pop on shut down 

when doing engine testing but only when the CHT was near redline.  I had 

problems with overtemp while idle running fully cowled and ended up 

fabricating a cowl flap.  Now that the CHT/water temp. stay lower I haven't 

had and repeats.



craig ellison

A205/N205CN

Silverton, OR

---

- The Matronics Europa-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?Europa-List

SPurpura(at)aol.com
Guest

Posted: Tue Mar 28, 2006 3:50 pm Post subject: 914 Backfiring

SOUNDS LIKE CARBS MAY BE OUT OF SYNC,TRY THE CARB BALANCING KIT FROM LOCKWOOD.

- The Matronics Europa-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?Europa-List

hagargs(at)earthlink.net
Guest

Posted: Tue Mar 28, 2006 5:34 pm Post subject: 914 Backfiring

Have balanced the carbs with a dual mercury manometers about 3 months ago

may have to reverify since I have been fooling around in there quite a bit

however.



Steve



Steve Hagar

hagargs(at)earthlink.net

 	  Quote: 	
		   [Original Message]

 From: <SPurpura(at)aol.com>

 To: <europa-list(at)matronics.com>

 Date: 3/28/2006 4:54:40 PM

 Subject: Re: 914 Backfiring



 



 SOUNDS LIKE CARBS MAY BE OUT OF SYNC,TRY THE CARB BALANCING KIT FROM

LOCKWOOD.
	


 	  Quote:

- The Matronics Europa-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?Europa-List

flyinggpa(at)comcast.net
Guest

Posted: Tue Mar 28, 2006 7:06 pm Post subject: 914 Backfiring

All



I have not found that backfiring is caused by anything but muffler to header pipe separation. That said (and I have proved it to my satisfaction) I think the backfire on shut down is not a problem.  If the mag switch is being used in steps that would make things just right for this to happen.  I do not shut down that way.



I shut down after taxiing home with a little "kick" of the throttle to go to about 3000 RPM then down to 1800 and off with both mags quick. Seems to work for me.

Cliff Shaw

1041 Euclid ave.

Edmonds, WA 98020

425 776 5555

http://www.europaowners.org/WileE



PS:  I like my Airmaster prop  too !!!!!

- The Matronics Europa-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?Europa-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Europa-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

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