RE: [COUPERS-TECH] Oil consumption

[Jason J. Ellingson]

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This is a case of... WTF?

 

According to the model 415-D AFM, with the C85-12, the green arc is 2400 to 2575 RPM regardless of propeller (wood or metal McCauley 1A-90).

 

However, according to the model E & G AFM, with the C85-12, the green arc is 1950 to 2575 RPM... plus two notes...

Regardless of propeller, the max recommended cruising RPM is 2400 RPM.

-and-

If you have the McCauley 1A-90-7148 metal propeller, you are to avoid 1950 to 2170 RPMs.

 

Personally, I'd trust the model E & G AFM numbers.  Especially since he is flying a model E.  That gives you cruising RPMs of 2180 to 2400 RPMs.

 

Maybe there are Service Bulletins that help clarify these numbers?  I've also not looked to see if anything is in the Service Manuals.

------------------------------------------------------------
Jason J Ellingson
NC2273H

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From: Sydney Cohen [mailto:[EMAIL PROTECTED]
Sent: Sunday, October 30, 2005 9:40 AM
To: scott
Cc: Ercoupe Tech
Subject: Re: [COUPERS-TECH] Oil consumption

----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----

scott wrote: 

What would be the typical oil consumption range of a C85-12 under these conditions:

 

@ 2200 RPM cruise

Why are you running it so slowly?  According to the D model POH, 2400 rpm is the bottom of the green arc.  Higher rpm gives you better lubrication, cooling and less chance of lead fouling of the valves and spark plugs, since the higher head temperatures keep the lead in solution rather than letting it form deposits.

 

I am only looking for a range of oil use that might be considered  'normal' for a mid- time

engine.

One quart in 4 to 6 hours should be typical.  

2.

 

I was dismayed to find out the 415E I own does not squeak into the new Sports plane category.

Is there such a thing as a ' variance ' (for lack of a better term)?

The gross weight of the Light Sport Aircraft is limited to 1320 lbs.  The gross weight of a 415E is 1400 lbs, so it does not qualify.  Sorry.

Syd

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