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O-360/CS full power fuel flow

 
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czechsix(at)juno.com
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PostPosted: Thu Feb 09, 2006 6:09 am    Post subject: O-360/CS full power fuel flow Reply with quote

Guys,
For those of you with a 180 HP O-360, CS prop, and fuel flowmeter.....can anybody tell me what fuel flow they see at full takeoff power / 2700 rpm / mixture rich? The Lycoming manual shows about 15 gph at full power, but the engine break-in documentation that came from Aerosport Power shows something like 22 gph at max power. That's a pretty big discrepancy. Curious if anybody can verify one number or the other...
Thanks,
--Mark Navratil
Cedar Rapids, Iowa
RV-8A N2D, FAA inspection tomorrow with first flight as soon as the wx cooperates....

Guys,


For those of you with a 180 HP O-360, CS prop, and fuel flowmeter.....can anybody tell me what fuel flow they see at full takeoff power / 2700 rpm / mixture rich? The Lycoming manual shows about 15 gph at full power, but the engine break-in documentation that came from Aerosport Power shows something like 22 gph at max power. That's a pretty big discrepancy. Curious if anybody can verify one number or the other...


Thanks,


--Mark Navratil
Cedar Rapids, Iowa
RV-8A N2D, FAA inspection tomorrow with first flight as soon as the wx cooperates....


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DOUGPFLYRV(at)aol.com
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PostPosted: Thu Feb 09, 2006 6:31 am    Post subject: O-360/CS full power fuel flow Reply with quote

The last time I noticed I was burning about 20 GPH on take off.
Doug Preston
RV-7

DO NOT ARCHIVE


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lors01(at)msn.com
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PostPosted: Thu Feb 09, 2006 7:15 am    Post subject: O-360/CS full power fuel flow Reply with quote

I like to keep records on these numbers myself. EAA published an extensive test (including fuel flow numbers) on different exhaust systems and the test horse was the IO - 360. The max power fuel flow was always in the neighborhood of 20 - 21 GPH. The 180 HP O - 360 would burn proportionally less (about 18 - 19 GPH at max power) but 15 GPH at 180 HP is somewhat optimistic I think. Running the engine rich during break-in would easily put it in the 22 GPH area.

My Mazda rotary makes about 200 HP at 7000 rpm and burns about 20 GPH. What a coincidence!

The BSFC of most any piston (or rotary) engine improves when tested at less than max power. It takes less than half the fuel to make half the HP, especially when leaning the mixture aggressively.

Tracy Crook

---


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rv8a2001(at)yahoo.com
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PostPosted: Thu Feb 09, 2006 7:23 am    Post subject: O-360/CS full power fuel flow Reply with quote

On a 180 HP engine that is too much according to Mahlon on the Lycoming list. Matter of fact I would ask this question on the Lycoming list. If I remember correctly a 180 hp engine is approx 15~17, a 200 hp enigne is about approx 18~20. I have a modifed engine which puts out 190~195 hp and I see 18.7~19.3. OAT can make a good .5 GPH differnece.

DOUGPFLYRV(at)aol.com wrote:

The last time I noticed I was burning about 20 GPH on take off.
Doug Preston
RV-7

DO NOT ARCHIVE

Scott Bilinski
RV-8a
cell 858-395-5094

---------------------------------


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Vanremog(at)aol.com
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PostPosted: Thu Feb 09, 2006 7:48 am    Post subject: O-360/CS full power fuel flow Reply with quote

In a message dated 2/9/2006 6:11:28 A.M. Pacific Standard Time,
czechsix(at)juno.com writes:

For those of you with a 180 HP O-360, CS prop, and fuel flowmeter.....can
anybody tell me what fuel flow they see at full takeoff power / 2700 rpm /
mixture rich? The Lycoming manual shows about 15 gph at full power
=======================================================

15-16 gph is what I see routinely at take off at my field on my 0-360 c/s
WFO at 400 ft MSL. 8.2-8.4 gph is what I see leaned out at 65%.

GV (RV-6A N1GV O-360-A1A, C/S, Flying 774hrs, Silicon Valley, CA)


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khorton01(at)rogers.com
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PostPosted: Thu Feb 09, 2006 7:55 am    Post subject: O-360/CS full power fuel flow Reply with quote

On 9 Feb 2006, at 14:06, czechsix(at)juno.com wrote:

Quote:


Guys,
For those of you with a 180 HP O-360, CS prop, and fuel
flowmeter.....can anybody tell me what fuel flow they see at full
takeoff power / 2700 rpm / mixture rich? The Lycoming manual shows
about 15 gph at full power, but the engine break-in documentation
that came from Aerosport Power shows something like 22 gph at max
power. That's a pretty big discrepancy. Curious if anybody can
verify one number or the other...

Mark,

If you are looking at Figure 3-34 in the Lycoming Operator's Manual,
it is labelled "Minimum Allowable Fuel Flow". There is nothing wrong
with having a higher fuel flow than that, as long as the engine runs
smoothly.

Kevin Horton RV-8 (finishing kit)
Ottawa, Canada
http://www.kilohotel.com/rv8


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rv8a2001(at)yahoo.com
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PostPosted: Thu Feb 09, 2006 8:04 am    Post subject: O-360/CS full power fuel flow Reply with quote

The numbers I gave are from memory from about a year ago, they were posted by Mahlon from Mattituc. Maybe I am off a gallon on the low side but I think close. Again you want real answers from someone who has run hundreds of engines on the dyno, then post this question on the Lycoming list and Mahlon will answer it with real numbers.

Tracy Crook <lors01(at)msn.com> wrote:

I like to keep records on these numbers myself. EAA published an extensive test (including fuel flow numbers) on different exhaust systems and the test horse was the IO - 360. The max power fuel flow was always in the neighborhood of 20 - 21 GPH. The 180 HP O - 360 would burn proportionally less (about 18 - 19 GPH at max power) but 15 GPH at 180 HP is somewhat optimistic I think. Running the engine rich during break-in would easily put it in the 22 GPH area.

My Mazda rotary makes about 200 HP at 7000 rpm and burns about 20 GPH. What a coincidence!

The BSFC of most any piston (or rotary) engine improves when tested at less than max power. It takes less than half the fuel to make half the HP, especially when leaning the mixture aggressively.

Tracy Crook

---


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randy(at)romeolima.com
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PostPosted: Thu Feb 09, 2006 8:52 am    Post subject: O-360/CS full power fuel flow Reply with quote

Quote:
For those of you with a 180 HP O-360, CS prop, and fuel flowmeter.....can
anybody tell me what fuel flow they see at full takeoff power / 2700 rpm /
mixture rich? The Lycoming manual shows about 15 gph at full power, but
the engine break-in documentation that came from Aerosport Power shows
something like 22 gph at max power.

16-17 gph for mine. Almost always read 16.5 when taking off from near sea
level. I would imagine jetting could change this figure when running at full
rich mixture. If someone is burning 19-20 gph their main jets may be too
large.

Randy Lervold


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dan.beadle(at)inclinesoft
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PostPosted: Thu Feb 09, 2006 8:58 am    Post subject: O-360/CS full power fuel flow Reply with quote

These numbers seem about right. Rule of thumb is about 10HP / Gallon when
at best power (100 degrees rich). Varies by engine type, but generally
within 10%

--


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Kellym



Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

PostPosted: Thu Feb 09, 2006 9:43 am    Post subject: O-360/CS full power fuel flow Reply with quote

A related question. Does anyone know if the standard certified
carburetor for the Lyc. O-360 has a power enrichment circuit(for full
throttle enrichement)?
If so, I would think that as soon as you reduced throttle 1/2 inch for
cruise the EGTs would rise noticeably. Can anyone confirm that?

Do not archive

Quoting scott bilinski <rv8a2001(at)yahoo.com>:

Quote:


The numbers I gave are from memory from about a year ago, they were
posted by Mahlon from Mattituc. Maybe I am off a gallon on the low
side but I think close. Again you want real answers from someone who
has run hundreds of engines on the dyno, then post this question on
the Lycoming list and Mahlon will answer it with real numbers.



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Kelly McMullen
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mstewart(at)iss.net
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PostPosted: Thu Feb 09, 2006 11:48 am    Post subject: O-360/CS full power fuel flow Reply with quote

18 for me at sea level.
~17 at 1000'
do not archive
Mike
--


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alexpeterson(at)earthlink
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PostPosted: Thu Feb 09, 2006 6:28 pm    Post subject: O-360/CS full power fuel flow Reply with quote

Quote:


Guys,
For those of you with a 180 HP O-360, CS prop, and fuel
flowmeter.....can anybody tell me what fuel flow they see at
full takeoff power / 2700 rpm / mixture rich? The Lycoming
manual shows about 15 gph at full power, but the engine
break-in documentation that came from Aerosport Power shows
something like 22 gph at max power. That's a pretty big
discrepancy. Curious if anybody can verify one number or the other...
Thanks,
--Mark Navratil

Mark, the 22 sounds quite high. Mine runs at about 16 or so at 1000msl, and
many others have reported similar results in past threads on this subject.
Don Rivera (designer of the Airflow Performance system) has indicated to me
that 17 or so is correct for a 180hp at sea level (I'll have to note the
flow next time I'm at sea level, which will be Sun-n-Fun in April).

There are some extremely good articles about engine management written by
John Deakin on www.avweb.com. They are not necessarily easy reading, so
plan on spending some serious time studying them.

The one number I've not been able to directly find yet is the specific fuel
consumption desired for a full throttle sea level condition. Clearly, at
this full rich setting, excess fuel is desired to modify the combustion to
eliminate detonation and to run cooler. My 16 gph at 1000msl would work out
to be about .57 lb/hp/hr (sfc, specific fuel consumption). Best power is
around .51, while best economy is around .4. 22gph would be .73 lb/hp/hr.
Does anyone know the desired sfc for full throttle, sea level power?

Alex Peterson
RV6-A N66AP 712 hours
Maple Grove, MN


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