0-235 L2c RPM

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Offline Dave in Eugene

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0-235 L2c RPM
« on: June 04, 2005, 10:04:02 AM »
Just wondering... for you folks flying infront of an 0-235 what RPM are you getting static? and what are you using for cruise?

3 hours after rebuild I am getting 2300 static and cruiseing above 2650 for break in... (full rich)

The book (long ez handbook) says should get 2450 minimum static rpm and I am understanding that this means that I am not developing full rated horse power for take off and that it could mean a higher cruiese (158-160 knots at 2600)... Would love you thoughts on the matter...

Dave
408 EZ Long EZ 0235-L2C / Great American 62X62 / IFR / GU canard

Offline Harry A

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Re: 0-235 L2c RPM
« Reply #1 on: June 05, 2005, 10:39:47 AM »
Dave you don't mention whether that 2650rpm is full throttle. If both those numbers you mentioned are at full throttle then yes you may be a bit over pitched for your HP. But you mention that you are full rich, I would think you should be leaning as much as CHT allows. you will pick up RPM just from that alone on the top end.

Many Eze pilots have the "Need for Speed" and they will sacrifice takeoff power for a higher top end. You will have to determine what you are comfortable with. If you operate out of short strips or high altitudes you might want that climb performance over speed.

3 hours out of the box on a new OH do you think the engine has settled in that soon? BTW did you see CHT's that went down after 20-40 minutes on that first flight as the rings seated?


Quote from: "Dave in Eugene"
Just wondering... for you folks flying infront of an 0-235 what RPM are you getting static? and what are you using for cruise?

3 hours after rebuild I am getting 2300 static and cruiseing above 2650 for break in... (full rich)

The book (long ez handbook) says should get 2450 minimum static rpm and I am understanding that this means that I am not developing full rated horse power for take off and that it could mean a higher cruiese (158-160 knots at 2600)... Would love you thoughts on the matter...

Dave
Harry Abbott
LEZ N661ST

Offline Dave in Eugene

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0-235 L2c RPM
« Reply #2 on: June 05, 2005, 10:46:13 AM »
harry,

I haven't pushed to full throttle...not sure why not what I am used too. I am sure I can get 2,700+ out it there...

I was watching to see if temps would settle and can't say that I really noticed big changes... #4 CHT is 385 degrees at cruise with the rest being less... I have 415 degrees on climb out but have been keeping it shallow for the break in...

Thanks for your response,

Dave
408 EZ Long EZ 0235-L2C / Great American 62X62 / IFR / GU canard

Ken

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O-235 rpm
« Reply #3 on: June 05, 2005, 10:45:39 PM »
I flew my LongEz with an O-235 C2C for 1800 hours; rpm was highly dependent on the prop, air intake system, and exhaust system. Best prop I had (of four) was from Ted Hendrickson (now Rowbear), 62/60, I think, and I routinely saw 2500 at turnup, and cruised at 3000 rpm, both full throttle. A Great American was a little less on both ends. Also rpm is affected by location and type of aircleaner (firewall plans location is a little more restrictive than the ram air type.....some question about increased tendency for carb ice with the ram air type), type of exhaust....2 in 1 plans exhaust a little more restrictive than the four pipe one from Hunt. I've since upgraded to an O-320, and still have both props. Used, but in good shape. Cheap!

Offline Dave in Eugene

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0-235 L2c RPM
« Reply #4 on: June 05, 2005, 11:25:51 PM »
Ken,

Thanks for the information..didn't know there were options on the intake or exhaust for that matter...learning curve still steep. Are you in K- Falls?

Dave
408 EZ Long EZ 0235-L2C / Great American 62X62 / IFR / GU canard

Offline Dave in Eugene

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0-235 L2c RPM
« Reply #5 on: June 06, 2005, 07:34:35 AM »
...and yes, I'd be interested in hearing more about you props.  thanks Dave
408 EZ Long EZ 0235-L2C / Great American 62X62 / IFR / GU canard

Offline Snappy

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0-235 L2c RPM
« Reply #6 on: June 06, 2005, 12:13:52 PM »
Eric Cobb at www.ecob.net makes a good airbox.  He is a good information source and flys a Long Ez.  Anytime you need a mission, let me know and we can fly down to IZA and see him.  He will help you alot.

Regarding your RPM/Prop.  Your prop should allow you to run full throttle at your target RPM while still getting acceptable climb.  And since your top speed/RPM changes with airframe clean up, everything you do will add to that combination a little.

Gary Hertzler is also very good at airframe efficency and builds a damn good prop.  He also flys a very nice Vari Ez.

While you are breaking in, look over the airplane carefully to see if there are any items hanging out in the wind that you can clean up.  For me, something as easy as lowering the wheel pants added 2 or 3 kts to the top speed.  (this was a Hertzler suggestion)

Steve in KFalls
Snappy
Long EZ 988AB

Offline Snappy

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0-235 L2c RPM
« Reply #7 on: June 06, 2005, 12:15:32 PM »
http://www.ecobb.net/index.htm

sorry for the dead link, this should work.

Steve
Snappy
Long EZ 988AB

Offline Dave in Eugene

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0-235 L2c RPM
« Reply #8 on: June 06, 2005, 02:31:02 PM »
I am getting the story... full power is common... even recommended. Not what I am used to. Thanks. Hope we can meet some time and introduce our planes to one another.  dave
408 EZ Long EZ 0235-L2C / Great American 62X62 / IFR / GU canard

KenK

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O-235
« Reply #9 on: June 06, 2005, 10:39:23 PM »
Dave:

I'm in Bremerton, Washinton. If you're interested in the two used props, I have two in reasonable shape, both from my O-235 C2C powered Long Ez, with a 4'" and an 8" prop extension, spinner and backplate. One of the props is a Rowbear (good prop), and the other is an older Great American, which I used for a backup when the primary prop ate a rock. Happens.  If interested, you can email me at tkoskella@wavecable.com.  Upgraded to an O-320 E2A, so have lots of parts sitting around gathering dust.

Ken

Matt

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breakin
« Reply #10 on: June 07, 2005, 10:41:48 AM »
To get a successful breakin, high power settings may be required.  This is so because the higher power settings increase the pressure of the rings against the cylinder walls.  Low power settings may cause low ring pressure, which is more likely to glaze and burnish the cylinder wall, which will keep the cylinders from ever breaking in.  So, I'd run as high a power setting as your cooling system will allow.  Also, fly your breakin hours early in the morning when ambient temps are at the lowest.  If you are using new cylinders (from ECI, or Superior), the above seems less critical, but still a good practice...

Matt-


"I am getting the story... full power is common... even recommended. Not what I am used to. Thanks. Hope we can meet some time and introduce our planes to one another. dave"

Offline rglos

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0-235 L2c RPM
« Reply #11 on: June 07, 2005, 11:28:13 AM »
Hi Dave

I also have a complete overhaul on my L2C, Great American 62 x 62 with now 5 hours on it. Recommended break in was at "high" rpm for ten or more hours. I took high rpm to mean full throttle, and rich.

Outside temps lately have been 60 to 70 and oil temp runs around 180 to 210

Static Rpm has been about 2400 and full throttle just a hair above 2800
With this I'm pushing just above 140 kts indicated at 3000 ft

This is at the end of 5 hours.

I didn't take data to start but it seems to be getting better.
 
I hope these can be used for comparison

Rick
Long EZ, 0-235L2C, 1986

Offline Dave in Eugene

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0-235 L2c RPM
« Reply #12 on: June 10, 2005, 12:18:54 AM »
Rick,

Flew today at 5,000 full throttle full rich. Got 2650 Rpm Indicating 145 knots... I will try tomorrow (if time allows at 3,000) and see what  I can get.

Amazing that we have the exact same setup.

Dave
408 EZ Long EZ 0235-L2C / Great American 62X62 / IFR / GU canard

Offline rglos

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« Reply #13 on: June 10, 2005, 09:15:57 AM »
Hi Dave

Interesting numbers. Even more amazing. Account for variances in
drag, tach error differences, airspeed indicators and a small bit to altitude, we are only 5 kts apart with the same plane, same prop, same engine and exactly the same time on the engines.

If you think about it, the spread between your high and low end RPM and mine are about the same. One of us could have a 150 rpm error in the tach.

I would imagine this is pretty typical for us Long Ez's drivers with 0-235 L2Cs

167 mph burning less than 7 gallons and hour on less than 120 Hp-not bad

Opps, almost forgot 860 lbs empty with the big Prestolite starter

Rick[/img]
Long EZ, 0-235L2C, 1986

Offline Dave in Eugene

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« Reply #14 on: June 10, 2005, 10:17:48 AM »
No kidding.... Amazing...More when I have time.

I am running a digital tach... You?  Wheel pants?

880 lbs i think...

.Dave
408 EZ Long EZ 0235-L2C / Great American 62X62 / IFR / GU canard