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Drilling exhaust for EGT

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recapen(at)earthlink.net
Guest

Posted: Mon Jul 03, 2006 12:38 pm Post subject: Drilling exhaust for EGT

Fellow listers,



I'm getting ready to drill into my Vetterman exhaust to install the EGT transducers for my VM1000 engine monitor.



I've already got some of the CHT transducers wired and working so I think I have my transducer wiring technique working.



Other than drilling them the same distance down from the head mounting flange and staying away from the spark plugs, I haven't been able to find any info on the best place to drill the holes.  Even though straight outboard looks like a great place to put them - I'm wondering about the cowl (I have a Sam James Cowl).



Anyone out there have any photos of what worked well for them?



Kinda scary - drilling holes in an exhaust system...don't they leak?



Thanks,

Ralph Capen

RV6A N822AR (at) N06 Wiring firewall foreward

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recapen(at)earthlink.net
Guest

Posted: Mon Jul 03, 2006 12:51 pm Post subject: Drilling exhaust for EGT

Fellow listers,



I'm getting ready to drill into my Vetterman exhaust to install the EGT transducers

for my VM1000 engine monitor.



I've already got some of the CHT transducers wired and working so I think I have

my transducer wiring technique working.



Other than drilling them the same distance down from the head mounting flange and

staying away from the spark plugs, I haven't been able to find any info on the best

place to drill the holes.  Even though straight outboard looks like a great place

to put them - I'm wondering about the cowl (I have a Sam James Cowl).



Anyone out there have any photos of what worked well for them?



Kinda scary - drilling holes in an exhaust system...don't they leak?



Thanks,

Ralph Capen

RV6A N822AR (at) N06 Wiring firewall foreward

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Terry Watson

Joined: 09 Jan 2006
Posts: 290
Location: Seattle, WA USA

Posted: Mon Jul 03, 2006 2:45 pm Post subject: Drilling exhaust for EGT

Ralph,



I think straight out would interfere with your cowl. Remember too that the

wires won't want to make a sharp 90 degree bend at the end of the

transducer. I feel like I lucked out with mine, not realizing how the lower

plugs were going to protrude. Mine sweep back on the outside, maybe 45

degrees instead of 90 degrees. I think I have seen some turned in somewhat

towards the engine which kept the wires from the transducers more out of the

way.



Hopefully someone else will give you a better answer.



Terry

RV-8A finishing?

Seattle

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lhelming(at)sigecom.net
Guest

Posted: Mon Jul 03, 2006 3:32 pm Post subject: Drilling exhaust for EGT

You will not want to drill them at a 90 degree bearing to your longitudinal 

plane.  Rather, you want to drill them more on a 45 degree angling back 

toward the rear of the engine.  You can angle them toward the 

outside/cowling or the inside.  I did mine toward the outside because I 

could drill it with the exhaust system installed on the engine.  It works 

fine.  It would however probably be a cleaner install to drill the angle 

toward the center of the rear of the engine on about a 45 degree angle but 

that would require careful marking and exhaust removal and reinstall unless 

you have a nice tight fit angle drill.  That inside route would remove any 

chance of interference with the cowling.  The exhaust system will be tight 

with a properly installed sensor and will not leak.  Larry in Indiana

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FLYaDIVE(at)aol.com
Guest

Posted: Mon Jul 03, 2006 5:31 pm Post subject: Drilling exhaust for EGT

In a message dated 7/3/06 4:44:39 PM Eastern Daylight Time, 

recapen(at)earthlink.net writes:



 	  Quote: 	
		   I haven't been able to find any info on the best place to drill the holes.  

 Even though straight outboard looks like a great place to put them - I'm 

 wondering about the cowl (I have a Sam James Cowl).

  

  Anyone out there have any photos of what worked well for them?

  

  Kinda scary - drilling holes in an exhaust system...don't they leak?

  

  Thanks,

  Ralph Capen

  RV6A N822AR (at) N06 Wiring firewall foreward

================================
	


Ralph:



You have to look at EVERYTHING!

What will be blocked - Manifold Nuts & Bolts

Cowling - Well you know that

Where the strap will be when it is fully tightened.

Service loop on the probe wires

NO strain on any of the wires

Distance down from the face of the exhaust flange.

[Remember EGT & CHT are only reference values.  Of course CHT is a bit more 

accurate as long as you don use Ring or Bayonet Thermocouples.  EGT is way too 

variable. The numbers you get are YOUR numbers and no one else's.  As the 

disclaimer goes YMMV.]



I believe all mine are on a 45 Deg angle.



Barry

"Chop'd Liver"

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Larry Bowen

Joined: 09 Jan 2006
Posts: 802
Location: NC, USA

Posted: Mon Jul 03, 2006 6:31 pm Post subject: Drilling exhaust for EGT

Consider orienting the hole so that the wire coming from sensor is pointed

in a friendly direction -- like parrallel to the wire bundle.



-- 

Larry Bowen

Larry(at)BowenAero.com

http://BowenAero.com



Ralph E. Capen wrote:

 	  Quote: 	
		   



 Fellow listers,



 I'm getting ready to drill into my Vetterman exhaust to install the EGT

 transducers

 for my VM1000 engine monitor.



 I've already got some of the CHT transducers wired and working so I think

 I have

 my transducer wiring technique working.



 Other than drilling them the same distance down from the head mounting

 flange and

 staying away from the spark plugs, I haven't been able to find any info on

 the best

 place to drill the holes.  Even though straight outboard looks like a

 great place

 to put them - I'm wondering about the cowl (I have a Sam James Cowl).



 Anyone out there have any photos of what worked well for them?



 Kinda scary - drilling holes in an exhaust system...don't they leak?



 Thanks,

 Ralph Capen

 RV6A N822AR (at) N06 Wiring firewall foreward

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_________________
Larry Bowen
RV-8 SOLD,
RV-7QB in progress...

Mark Phillips in TN

Joined: 10 Jan 2006
Posts: 431
Location: Columbia, TN

Posted: Mon Jul 03, 2006 7:30 pm Post subject: Drilling exhaust for EGT

Not too sure if it matters or not, but I angled mine 45 deg. aft on the right and 45 deg. fwd on the left.  My theory is this places the probes in the same relative position on each cylinder (#1 being the exception since the probe is just below the bend on my Vetterman x-over).  

  

 FWIW From The PossumWorks in TN

 Mark

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_________________
From The PossumWorks...

dreel(at)cox.net
Guest

Posted: Tue Jul 04, 2006 6:27 am Post subject: Drilling exhaust for EGT

Having drilled my O360 A1A's vetterman exhaust both ways, I consider a hole

that helps the wire line up with the lower spark plug leads the best

orientation.  The ones I drilled to join the wire bundle that runs along the

crankcase/sump joint are more difficult to work with plus they run through

the hot area just under the cooling fins.  Both methods are working OK but I

think bundling with the spark plug leads is a cleaner installation.  In my

case, it also let me get all sensors closer to the same distance from the

exhaust port.  At the same distance as all the other leads, the number 1

cylinder lead would have angled up to hit the cooling fins.



Also, if you make a mistake, grinding a stainless screw down and securing it

in the hole with a hose clamp is a decent alternative to junking that part

of the exhaust.



Dave Reel - RV8A

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