Since my C75 was converted to a C85 and rebuilt last year, I am
seeing 4.5 GPH pretty consistently. I cruise from 2250 RPM to 2400,
depending on my sense of urgency. I think I've see it up to 5 GPH,
but very rarely.
Larry Snyder
[EMAIL PROTECTED]
On Apr 10, 2007, at 10:15 AM, Jack Hirsch wrote:
Mike,
I have a 415C with a C 85 12F Continental engine. When I first got
the plane fuel consumption was quite high. Upon examination I
found that the connection between the gascolator and the
carburettor had fractured. It only leaked when airborne, and there
was little evidence when on the ground. When I took the assembly
apart the fitting broke in two. Since replacing the fitting and,
by the way all the fuel hoses, the fuel consumption is more
reasonable.
On my C 85 at 2550 RPM, indicating 130 mph (GPS more like 105
knots) I see 5 to 5.2 gallons per clock hour - very very
predictable. At lower power settings I still see 5 gallons per
tach hour. I do lean the stromberg carburettor in flight to an EGT
reading of 1480 or so on cylinder number two. It is the first
cylinder to reach peak EGT. I have a four probe JPI digital EGT /
CHT installed.
Interesting to have modern engine instrumentation in a 60 year old
airplane.
I wish you well in your hunt - and suggest it may well be a leak
that is not obvious. Mine was certainly that way.
Jack
N3667H - ERCO 415 - C "Casper" born 10/31/46
On 4/10/07, Mike Willis <[EMAIL PROTECTED]> wrote:
Hi guys and gals,
I know this has been discussed before but I can't find any specific
clues to my problem in the archives.
I have a 1966 Alon A2 with a C90 and the standard prop. Fuel
consumption seems to be quite high, higher than it should be. I've
been waiting for some fine weather to fly a reasonable distance to
give a good measure, to avoid the taxi/climb bias of the short
trips over the winter.
Last Friday I flew solo a one and one half hour trip and it drank
32 litres, or 23 litres per hour (6 USG per hour). I flew at 2,000
feet at 2,200 rpm which gave around 82 knots IAS.
The engine is pretty old and has done 1,200 hours, about 300 hours
since a major top end overhaul. It runs very sweetly and is
consuming only 0.2 litres of oil per hour (less than half a US pint
per hour).
The prop is only a couple of years old and in very good condition.
At my last service I had the engineer take the floorboards up and
have a good check for fuel leaks and he found nothing.
So is this excessive consumption? It seems well above book figures
– and if so any ideas how to investigate further. I'm concerned
about range at this stage – 3 hours including reserve – although
with Avgas here at $9.50 a USG it is a little expensive as well!
Thanks,
Mike
--
Jack Hirsch
N3667H Ercoupe 415C
[EMAIL PROTECTED]
