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OT Translation question

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Gilles.Thesee(at)ac-greno
Guest

Posted: Thu Mar 16, 2006 12:02 pm Post subject: OT Translation question

Hi Bob and all,



A fellow builders in my area is having problems translating the 

expression "runner-log-branch", in the following paragraph from G.Braly 

on TC engine mixture problems.



 >

 > > <<This pattern is almost universal among big bore TCM engines with

 > > the runner log-branch induction systems. The pattern is consistently

 > > observed because it is a result of the inherent design of the runner

 > > log-branch induction system. >>

 >

I know what induction runners are, but I'm at loss accurately rendering 

the expression.

Anyone care to put this into clearer words for us non naturally English 

speakers ?



The following may be similar to the text my buddy is translating  :



http://www.nar-associates.com/technical-flying/Vibration/Vibnet.pdf



Any input appreciated,

Thanks in advance



Regards,

Gilles Thesee

Grenoble, France

http://contrails.free.fr

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mprather(at)spro.net
Guest

Posted: Thu Mar 16, 2006 12:51 pm Post subject: OT Translation question

Gilles,



Most (all?) of the big bore Continentals (TCM) have the induction system

split into two halves - one for each side of the engine.  Each half

essentially consists of a single large aluminum tube oriented to run near

the intake port on each cylinder.  This is the 'log.'  There's an opening

in the 'log' immediately under the each cylinder's port.  Individual tubes

connect from each cylinder port to its respective opening on the 'log'. 

These are the 'branches'.  In reality, the 'runner-log-branch' is formed

in segments from aluminum T's.  The center of each T connects to the

cylinder port.  The sides of each T connects to the adjacent cylinder on

each side (or to a tube that goes to the carburetor or the crossover).



A picture is worth 1k words:



http://a1aero.com/files/DSCN0662.JPG



The 'log' is connected together by the orange hoses in the picture.

Matt-

 	  Quote: 	
		   

 <Gilles.Thesee(at)ac-grenoble.fr>



 Hi Bob and all,



 A fellow builders in my area is having problems translating the

 expression "runner-log-branch", in the following paragraph from G.Braly

 on TC engine mixture problems.



  >

  > > <<This pattern is almost universal among big bore TCM engines with

 the runner log-branch induction systems. The pattern is

 consistently observed because it is a result of the inherent design

 of the runner log-branch induction system. >>

  >

 I know what induction runners are, but I'm at loss accurately rendering

 the expression.

 Anyone care to put this into clearer words for us non naturally English

 speakers ?



 The following may be similar to the text my buddy is translating  :



 http://www.nar-associates.com/technical-flying/Vibration/Vibnet.pdf



 Any input appreciated,

 Thanks in advance



 Regards,

 Gilles Thesee

 Grenoble, France

 http://contrails.free.fr

- The Matronics AeroElectric-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:

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Kellym

Joined: 10 Jan 2006
Posts: 1700
Location: Sun Lakes AZ

Posted: Thu Mar 16, 2006 12:52 pm Post subject: OT Translation question

The engines referred to have a cylindrical tube that runs parallel to 

the crankshaft on the outside, below the cylinder heads,(on both sides 

of the engine) that is the induction manifold. There is an individual 

runner from that tube to each cylinder, and a runner at the front of 

the engine connecting the two tubes. It sort of loosely looks like a 

wooden log, with branches or runners coming from it.

That is what makes it different from the Lycoming type intakes where 

you have a single plenum, usually as part of the oil sump, with 

individual manifold tubes to each cylinder.

Do Not Archive

Quoting Gilles Thesee <Gilles.Thesee(at)ac-grenoble.fr>:



 	  Quote: 	
		   

 <Gilles.Thesee(at)ac-grenoble.fr>



 Hi Bob and all,



 A fellow builders in my area is having problems translating the

 expression "runner-log-branch", in the following paragraph from G.Braly

 on TC engine mixture problems.



 >

 > > <<This pattern is almost universal among big bore TCM engines with

 > > the runner log-branch induction systems. The pattern is consistently

 > > observed because it is a result of the inherent design of the runner

 > > log-branch induction system. >>

 >

 I know what induction runners are, but I'm at loss accurately rendering

 the expression.

 Anyone care to put this into clearer words for us non naturally English

 speakers ?



 The following may be similar to the text my buddy is translating  :



 http://www.nar-associates.com/technical-flying/Vibration/Vibnet.pdf



 Any input appreciated,

 Thanks in advance



 Regards,

 Gilles Thesee

 Grenoble, France

 http://contrails.free.fr

- The Matronics AeroElectric-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?AeroElectric-List

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor # 5286
KCHD

brian

Joined: 02 Jan 2006
Posts: 643
Location: Sacramento, California, USA

Posted: Thu Mar 16, 2006 1:08 pm Post subject: OT Translation question

Gilles Thesee wrote:

 	  Quote: 	

 Hi Bob and all,

 A fellow builders in my area is having problems translating the 

 expression "runner-log-branch", in the following paragraph from G.Braly 

 on TC engine mixture problems.

  >

  > > <<This pattern is almost universal among big bore TCM engines with

  > > the runner log-branch induction systems. The pattern is consistently

  > > observed because it is a result of the inherent design of the runner

  > > log-branch induction system. >>

  >

 I know what induction runners are, but I'm at loss accurately rendering 

 the expression.

 Anyone care to put this into clearer words for us non naturally English 

 speakers ?

The "runner log" is somewhat like the trunk of a tree. It is larger in 

diameter and straight. The actual induction tubes that go to each 

cylinder "branch" off the "log" just like the branches of a tree. The 

name is intended to convey a picture of a wood log with branches coming 

off of it.

This is used to describe the older, non-tuned induction system used on 

TCM engines. The problem is that not every cylinder receives the same 

amount of air and fuel which results in differences in power output and 

mixture at each cylinder.

Newer engines have a tuned induction system that does a better job of 

getting air to each cylinder. Each cylinder receives (almost) the same 

amount of air and the injection system ensures that each cylinder 

receives the same amount of fuel. The whole idea behind GAMI's custom 

injection nozzles is to match the fuel flow to the airflow at each 

cylinder, thus ensuring that each cylinder receives *exactly* the same 

fuel-air mixture. This then makes lean-of-peak operation possible.

Brian Lloyd

brian-yak(at)lloyd.com

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_________________
Brian Lloyd
brian-yak at lloyd dot com
+1.916.367.2131 (voice) +1.270.912.0788 (fax)

I fly because it releases my mind from the tyranny of petty things . . .
- Antoine de Saint-Exupery

Gilles.Thesee(at)ac-greno
Guest

Posted: Thu Mar 16, 2006 2:36 pm Post subject: OT Translation question

Matt, Kelly, Brian,



Thanks a lot for your explanations and picture.

Things are much clearer now. So it really was a wooden log...I was not 

so far, after all 



Thanks again,



Regards,

Gilles Thesee

Grenoble, France

http://contrails.free.fr

- The Matronics AeroElectric-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?AeroElectric-List

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