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RV fuel per hour and heat

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WPAerial(at)aol.com
Guest

Posted: Wed Feb 08, 2006 9:33 am Post subject: RV fuel per hour and heat

I have been following van's rvaitor article on economy flying. 1950 rpm's, 

airspeed 120 mpr, and leaning. getting great fuel / hour. always under 5 g/h 

with the best 4.42 g/h.



now i hear little jabs about i will burn up my O-320 which has a fixed pitch 

79" prop.

what should i think about this?



Also My oil temp has always run cold. i have a door over the oil cooler. is 

there away of telling if the veratherm is working properly, without buying a 

new one?



jerry wilken

albany oregon

rv6a n699wp

390 hours

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pitts_pilot(at)bellsouth.
Guest

Posted: Wed Feb 08, 2006 12:46 pm Post subject: RV fuel per hour and heat

WPAerial(at)aol.com wrote:



 	  Quote: 	
		  



I have been following van's rvaitor article on economy flying. 1950 rpm's, 

airspeed 120 mpr, and leaning. getting great fuel / hour. always under 5 g/h 

with the best 4.42 g/h.



now i hear little jabs about i will burn up my O-320 which has a fixed pitch 

79" prop.

what should i think about this?



I don't get the RVaitor ..... yet, so I can't comment on the article.  I 
	


don't understand how you can burn up the engine with those numbers.



 	  Quote: 	
		  Also My oil temp has always run cold. i have a door over the oil cooler. is 

there away of telling if the veratherm is working properly, without buying a 

new one?



You betcha!  Remove the vernatherm, and use a sharpie to paint the cone 
	


black.  Re-install.  Go fly (this is the best part!  ) and make sure 

you get at least 1/2 hour flight time to make sure everythings at a 

stabilized temperature.  Land.  Unfortunately we have to do that!  . 

 When things cool down, remove the vernatherm again.  You should have a 

nice shiny ring all the way around the cone where it contacted the hole 

in the accessory case.  No ring?  Get a new Vernatherm.

Linn

do not archive



 	  Quote: 	
		  

jerry wilken

albany oregon

rv6a n699wp

390 hours

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mctrader(at)bigpond.net.a
Guest

Posted: Wed Feb 08, 2006 1:08 pm Post subject: RV fuel per hour and heat

Hi Jerry,



I usually run my O-320 powered RV6 at 2250 rpm with a Sensenich 79" prop and

get great economy as well as good speed -

 like around 6 US gals per hour at 135 kts.. I too have been told to be

aware of burning up the engine, most notably the exhaust valves, as well as

glazing the bores.  I don't really see how, as my CHT's are all around

310-315 deg F, and the engine is producing approx 55% power.  I know we

didn't build our RVs to go slow, but it is relative, and the fuel savings

are nice.



Cheers



Martin in Oz

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n223rv(at)wolflakeairport
Guest

Posted: Wed Feb 08, 2006 4:49 pm Post subject: RV fuel per hour and heat

Or you can do what I did.  Remove it, put it in some real hot water

(like boiling or slightly less than boiling) and see if it moves.  You

can measure the end of it.  Put it in cold water and it will shrink...

Worked great for me.



By the way, O-320's run real cold most of the time.  My RV-4 runs real

cold all the time, in the summer I have a 3/4" hole going to the oil

cooler and I just get to 190F.  In the winter I block it off completely

and it still won't get to 180F

-Mike



--

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ceengland(at)bellsouth.ne
Guest

Posted: Wed Feb 08, 2006 7:18 pm Post subject: RV fuel per hour and heat

Mike Kraus wrote:



 	  Quote: 	
		  



Or you can do what I did.  Remove it, put it in some real hot water

(like boiling or slightly less than boiling) and see if it moves.  You

can measure the end of it.  Put it in cold water and it will shrink...

Worked great for me.



By the way, O-320's run real cold most of the time.  My RV-4 runs real

cold all the time, in the summer I have a 3/4" hole going to the oil

cooler and I just get to 190F.  In the winter I block it off completely

and it still won't get to 180F

-Mike




	


I'm always interested in how those low numbers are achieved. What fuel 

flow, rpm & mp are you running to get those temps, & what's your cht? Is 

yours rated at 150 or 160 hp? Oil cooler on firewall, back cyl baffle, 

or ?? Speed?



Inquiring minds (having owned several O-320's that ran hotter than that) 

want to know.



Thanks,



Charlie

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