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Rough running Jab 3300

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gary_eady(at)xtra.co.nz
Guest

Posted: Thu Feb 06, 2014 11:19 pm Post subject: Rough running Jab 3300

I'm having a few issues with my Jab 3300 solid lifter engine. Intermittently, normally under load in the climb, it develops a miss in either one or other of the front cylinders. The miss/rough running only lasts between about 10 and 20 seconds and recurs every couple of hours or so of flying - but is enough to make me look around quickly for an off field landing area.

Have checked the resistance and condition of the HT leads and also the coils. All seem to be ok.

The errant cylinder is easy to track via the EGT probes and is always number 1 or 2 which is suddenly about 100 degrees C cooler than the others.

The engine has 70 hours on it and starts well hot or cold - is burning no oil and throws virtually no oil into the breather bottle. All engine parameters are great including  cylinder head temps. Except for this darn miss.

Anyone else out there having or had a similar problem??





Regards

Gary

CH701,  Jab 3300A serial number 500, 70 hours total time. Grand Rapids EIS.





 [quote][b]

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psm(at)att.net
Guest

Posted: Thu Feb 06, 2014 11:36 pm Post subject: Rough running Jab 3300

Hi Gary,

       

       First let me say I am no expert on engines of any sort.  So don't       depend on my being right.

       

       I once had some strange miss-firing because the carburetor was       loose.  It was more dramatic than your story and only went bad       when I reduced to idle power for descent.

       

       The thing that comes to mind listening to your story is you are at       a high angle of attack.  That suggests there is something about       the air flow to the carburetor might be funny.  In my plane I took       extra measures to straighten out the air flow just in front of the       carburetor.  There are several ways to do this, and I don't really       know if any are necessary.

       

       A 3300 is a large engine for a 701.  You must get very high pitch       on the aircraft nose when climbing.  This suggests a possible       problem with fuel pressure could be involved.  Do you have a boost       pump?

       

       Good luck,

       

       Paul

       Camas, WA

       Zodiac XL, Jab 3300

       

       On 2/6/2014 11:16 PM, Gary Eady wrote:

     

     [quote]                I'm having a few issues with my Jab 3300 solid lifter           engine. Intermittently, normally under load in the climb, it           develops a miss in either one or other of the front cylinders.           The miss/rough running only lasts between about 10 and 20           seconds and recurs every couple of hours or so of flying - but           is enough to make me look around quickly for an off field           landing area.

         Have checked the resistance and condition of the HT leads           and also the coils. All seem to be ok.

         The errant cylinder is easy to track via the EGT probes and           is always number 1 or 2 which is suddenly about 100 degrees C           cooler than the others.

         The engine has 70 hours on it and starts well hot or cold -           is burning no oil and throws virtually no oil into the           breather bottle. All engine parameters are great including           cylinder head temps. Except for this darn miss.

         

         

         Anyone           else out there having or had a similar problem??

         

         

         

         

         Regards

         

         

         Gary

         

         

         CH701,            Jab 3300A serial number 500, 70 hours total time. Grand Rapids           EIS.

         

         

         

       

        	  Quote: 	
		  

	
     [b]

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zeprep251(at)aol.com
Guest

Posted: Fri Feb 07, 2014 8:53 am Post subject: Rough running Jab 3300

Gary,my first thought would be carb ice.Any way of determining air temp or humidity during these episodes?Do you have any carb heat provisions or alternate air intake possibilities?   G.Aman Kolb MK3 Jabiru 900 hrs

  

     

  

     

  

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UK Clive

Joined: 17 May 2013
Posts: 27

Posted: Fri Feb 07, 2014 9:31 am Post subject: Rough running Jab 3300

Does it do it if you throttle back a tad?



[quote] On 7 Feb 2014, at 16:52, Gary Aman <zeprep251(at)aol.com> wrote:

 

 Gary,my first thought would be carb ice.Any way of determining air temp or humidity during these episodes?Do you have any carb heat provisions or alternate air intake possibilities?

 G.Aman Kolb MK3 Jabiru 900 hrs

 

 

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UK Clive

Joined: 17 May 2013
Posts: 27

Posted: Fri Feb 07, 2014 9:40 am Post subject: Rough running Jab 3300

Carby ice doesn't occur at wot.....



[quote] On 7 Feb 2014, at 16:52, Gary Aman <zeprep251(at)aol.com> wrote:

 

 Gary,my first thought would be carb ice.Any way of determining air temp or humidity during these episodes?Do you have any carb heat provisions or alternate air intake possibilities?

 G.Aman Kolb MK3 Jabiru 900 hrs

 

 

 --

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BARRY CHECK 6

Joined: 15 Mar 2011
Posts: 738

Posted: Fri Feb 07, 2014 11:17 am Post subject: Rough running Jab 3300

Carb Ice sure can occur at WOT and even on a 70 F day.

 http://flighttraining.aopa.org/students/presolo/skills/carbicing.html



 

On Fri, Feb 7, 2014 at 12:38 PM, Clive james <zcrj90(at)yahoo.co.uk (zcrj90(at)yahoo.co.uk)> wrote:

 [quote]Carby ice doesn't occur at wot.....



On 7 Feb 2014, at 16:52, Gary Aman <zeprep251(at)aol.com (zeprep251(at)aol.com)> wrote:

 



[quote]Gary,my first thought would be carb ice.Any way of determining air temp or humidity during these episodes?Do you have any carb heat provisions or alternate air intake possibilities?   G.Aman Kolb MK3 Jabiru 900 hrs

  

     

  

     

  

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n5pb(at)aol.com
Guest

Posted: Fri Feb 07, 2014 2:28 pm Post subject: Rough running Jab 3300

I've experienced carb icing in Clearwater, FL the last couple of summers.  When it last happened I applied carb heat on continuously during landing and TAKEOFF on consecutive touch and go's.  With the carb heat on I experenced No further issues.  With that in mind, I installed the electric carburator heat assembly that jabiru USA sells.  This gave me the carb heat needed, but did not reduce engine efficiency.  so far i've not had any similiar issues.

   

  I did a write up on the installation and should be out with the next newsletter.

   

   

  Bear

  

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Gary Eady

Joined: 17 Feb 2014
Posts: 1

Posted: Mon Feb 17, 2014 11:31 am Post subject: Re: Rough running Jab 3300

Thanks guys. I flew 2 hours non-stop last weekend and left one element of the electric ice eliminator on at all times. No rough running problems so assuming the problem was icing.

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