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Carb Heat

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bertrv6(at)highstream.net
Guest

Posted: Tue Feb 28, 2006 2:39 pm Post subject: Carb Heat

Hi:



First time I try to contact this list.



Question is I do not get any confirmation on my EIS, on rpm  drop. when

applying Carb Heat.



I have checked with other rv onwners, they do not understand why?



We check every thing...looks OK..



It is standard  RV6A....I have  checked when taxing,, after temp is hot..

also during  flying...on the pattern, nothing...



My friend with same RV6a, gets  50 RPM drop  even when taxing...



He does not have EIS.. has regular gauges..



Any Suggestions,  comments  appreciated



Bert



RV6A



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Steve Glasgow

Joined: 10 Jan 2006
Posts: 674

Posted: Tue Feb 28, 2006 3:06 pm Post subject: Carb Heat

I had the same problem when I started flying.  Changed to a better Carb Heater than the original and restricted the opening a bit, then I got a drop.  Drop me a line and I will send a photo of what I have on Cappy's Toy. 



Steve Glasgow-Cappy

N123SG  RV-8

Cappy's Toy

704-362-0005

704-281-7884

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_________________
Steve Glasgow-Cappy
Cappy's Toy
RV-8 N123SG

tadsargent(at)bellsouth.n
Guest

Posted: Tue Feb 28, 2006 5:53 pm Post subject: Carb Heat

I do not get a dramatic drop either, maybe 10 degrees at an altitude of 3-5000 feet, but not on the ground.

Have you checked your carb temp while applying heat?

Tad

 	  Quote: 	
		   

 From: bertrv6(at)highstream.net

 Date: 2006/02/28 Tue PM 05:38:49 EST

 To: RVSouthEast-List(at)matronics.com

 Subject: Carb Heat

 

 

 

 

 

 Hi:

 

 First time I try to contact this list.

 

 Question is I do not get any confirmation on my EIS, on rpm  drop. when

 applying Carb Heat.

 

 I have checked with other rv onwners, they do not understand why?

 

 We check every thing...looks OK..

 

 It is standard  RV6A....I have  checked when taxing,, after temp is hot..

 also during  flying...on the pattern, nothing...

 

 My friend with same RV6a, gets  50 RPM drop  even when taxing...

 

 He does not have EIS.. has regular gauges..

 

 Any Suggestions,  comments  appreciated

 

 Bert

 

 RV6A

 

 Do Not Archive

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Larry Bowen

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

Posted: Tue Feb 28, 2006 6:44 pm Post subject: Carb Heat

I have about a 20 rpm drop during run-up per the EIS.  I have the bigger

heat muff.  I think of it more as an alternate air source than carb heat.



 	  Quote: 	
		  From what I've heard little or no drop is fairly common on the RV's.  


	


-

Larry Bowen

Larry(at)BowenAero.com

http://BowenAero.com

 



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

robert(at)thenews-journal
Guest

Posted: Tue Feb 28, 2006 7:54 pm Post subject: Carb Heat

I've got Vetterman's good carb heat muff and a flange mounted  

directly to FAB (no gap as in plans) and I don't get any drop on my EIS.

Like Larry said, I view it more as an alternate air source than carb  

heat.



Robert Dickson

RV-6A N69WZ

150 hrs

On Feb 28, 2006, at 5:38 PM, bertrv6(at)highstream.net wrote:






Hi:



First time I try to contact this list.



Question is I do not get any confirmation on my EIS, on rpm  drop. when

applying Carb Heat.



I have checked with other rv onwners, they do not understand why?



We check every thing...looks OK..



It is standard  RV6A....I have  checked when taxing,, after temp is  

hot..

also during  flying...on the pattern, nothing...



My friend with same RV6a, gets  50 RPM drop  even when taxing...



He does not have EIS.. has regular gauges..



Any Suggestions,  comments  appreciated



Bert



RV6A



Do Not Archive

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rwayne(at)gamewood.net
Guest

Posted: Tue Feb 28, 2006 8:46 pm Post subject: Carb Heat

I have an EIS and a large heat muff for my carb heat. I get a little drop in

rpm, but about 2" drop in MAP. I agree that your experience is normal for

RVs.



Wayne

 



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Dale Ensing

Joined: 11 Jan 2006
Posts: 571
Location: Aero Plantation Weddington NC

Posted: Wed Mar 01, 2006 4:05 am Post subject: Carb Heat

"...carb heat muff and a flange mounted directly to FAB (no gap as in plans)



Robert, does this allow for full air flow at wide open throttle?

Dale Ensing

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_________________
Dale Ensing
RV-6A
Aero Plantation
Weddington NC

robert(at)thenews-journal
Guest

Posted: Wed Mar 01, 2006 4:19 am Post subject: Carb Heat

that's a good question, one that I'm not sure I know the answer to. I  

set the carb heat up like this after a long conversation  with Larry  

Vetterman, but I don't think I've ever pulled carb heat at full  

throttle. I'm going flying today and will give it a try and report back.

BTW Larry V said that I'd get 50 rpm drop with this setup but I  

haven't seen anything on the ground, maybe a little with some altitude.



Robert Dickson

RV-6A N60WZ



On Mar 1, 2006, at 7:05 AM, Dale Ensing wrote:




<densing(at)carolina.rr.com>



"...carb heat muff and a flange mounted directly to FAB (no gap as in  

plans)



Robert, does this allow for full air flow at wide open throttle?

Dale Ensing

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robert(at)thenews-journal
Guest

Posted: Wed Mar 01, 2006 7:52 pm Post subject: Carb Heat

after a brief flight today I'd have to say no to your question. I  

didn't pull carb heat at full throttle, but I tried it at 25/25 (3000  

msl) and watched the MAP fall to about 24.4 on the GRT EIS. Of course  

with the constant speed prop there was no rpm change. I guess a fixed  

pitch prop would have shown an rpm drop.

I don't know how big a deal it is to lose 0.6 in. of MAP. The engine  

didn't miss a beat and the plane was still climbing nicely. I hope  

this info helps.



Robert Dickson

RV-6A N69WZ

160 hrs



On Mar 1, 2006, at 7:05 AM, Dale Ensing wrote:




<densing(at)carolina.rr.com>



"...carb heat muff and a flange mounted directly to FAB (no gap as in  

plans)



Robert, does this allow for full air flow at wide open throttle?

Dale Ensing

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