O-320-E2A

Frogs97

Frogs97

Pre-takeoff checklist
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Frogs97
As best as I can tell, this engine on the PA-28-140 can be rated at 140hp or 150hp and the only differentiation is that the 140hp is at 2450 rpm and the 150 hp is at 2700 rpm. Is that right? So if I'm in a 140 that only goes to 2400-2500 rpm at WOT, then is that an indication it is putting out 140hp? If so, what is the limiting factor holding the rpm down?
 
flyingriki said:
Prop....:confused:
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That was my thought too. But, reading through some things, it almost seems like it might be a throttle setting? I'm surprised there doesn't seem to be much out there about this at all (at least nothing I can find).

Oh, and sorry if my OP was a little terse. I was in line at the airport!
 
Check the data plate on your engine.

I have a different O-320, which can be 150 or 160. The difference is in the cylinders. So, your data plate and your engine logbook will tell you the rest of the story.
 
rolivi said:
Check the data plate on your engine.

I have a different O-320, which can be 150 or 160. The difference is in the cylinders. So, your data plate and your engine logbook will tell you the rest of the story.
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No such thing as a 140 HP 0-320-E2A...

They are 150 HP with the low compression pistons..

There is a 160 HP version (D2G) and others and they have the 74089 high compression pistons..
 
N801BH said:
No such thing as a 140 HP 0-320-E2A...

They are 150 HP with the low compression pistons..

There is a 160 HP version (D2G) and others and they have the 74089 high compression pistons..
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Well, the -E2A is rated for both 140hp@2450 and 150hp@2700. The Cherokee I'm looking at is only making 2450rpm, so I'm just curious if anyone knows what limits that? Prop was my first thought, but the only prop STCs that I saw all went with engine changes. I ran across an obscure site that said something about it maybe being a throttle stop setting, but it reall all seems like a black hole of information.

EDIT: here's a link from PennYan about the difference -
https://www.pennyanaero.com/Lycoming-320-Aircraft-Engines.php
 
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Frogs97 said:
Well, the -E2A is rated for both 140hp@2450 and 150hp@2700. The Cherokee I'm looking at is only making 2450rpm, so I'm just curious if anyone knows what limits that? Prop was my first thought, but the only prop STCs that I saw all went with engine changes. I ran across an obscure site that said something about it maybe being a throttle stop setting, but it reall all seems like a black hole of information.
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Link..:dunno::dunno:
 
The 140/150 rating is in this link: https://en.wikipedia.org/wiki/Lycoming_O-320

Also... what DA are you looking at to affirm the WOT RPM. I'm definitely a neophyte at this and evaluating without manifold pressure data makes it more difficult.

Surf some threads on VAF about engine performance. Some good reading.
 
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rolivi said:
The 140/150 rating is in this link: https://en.wikipedia.org/wiki/Lycoming_O-320

Also... what DA are you looking at to affirm the WOT RPM. I'm definitely a neophyte at this and evaluating without manifold pressure data makes it more difficult.

Surf some threads on VAF about engine performance. Some good reading.
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The factory retail price of the O-320 varies by model. In 2010 the retail price of an O-320-B1A purchased outright was USD$47,076[

HOLY Crap..... 47 grand for a Lycoming 4 cylinder motor...:hairraise::eek:
 
N801BH said:
The factory retail price of the O-320 varies by model. In 2010 the retail price of an O-320-B1A purchased outright was USD$47,076[

HOLY Crap..... 47 grand for a Lycoming 4 cylinder motor...:hairraise::eek:
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Are you implying that the Wiki is not accurately stating the rated horsepower of each model of O-320? Or just being happy you didn't buy a factory new one in 2010?
 
No reference and just what I understood, maybe wrongly. I thought that Piper put a flatter pitch prop on the 150 to improve its poor climb performance, making it an RPM limited 140. The engine hit red line before before getting enough fuel to put out 150. Bad idea so they went back to the previous prop but left the name.
 
O-320-E2A
150 hp (112 kW) at 2700 rpm, or 140 hp (104 kW) at 2450 rpm Minimum fuel grade 80/87 avgas, compression ratio 7.00:1.

I have the same engine and, depending on the pitch of my fixed pitch prop, have seen anything from 2650 to 2980 RPM. Have tested several props and currently top out at 2790.
 
flyingriki said:
O-320-E2A
150 hp (112 kW) at 2700 rpm, or 140 hp (104 kW) at 2450 rpm Minimum fuel grade 80/87 avgas, compression ratio 7.00:1.

I have the same engine and, depending on the pitch of my fixed pitch prop, have seen anything from 2650 to 2980 RPM. Have tested several props and currently top out at 2790.
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So, when you test and swap these props, do need to get STCs for each one?
 
rolivi said:
His sig says visited by canard. He's experimental. Velocity I think.
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IF he is EXP he can run any thing he wants. no paper work.

But I would strongly advise he not run any prop that will allow max engine RPM during a static run. those props will over speed during flight.
 
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rolivi said:
His sig says visited by canard. He's experimental. Velocity I think.
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That was what I was thinking, and Tom's question pointed me in the right direction for looking at alternate props (which there are none). It just seems odd that there isn't a simple stc to get the rpms up to take full advantage of the engine.
 
Tom-D said:
IF he is EXP he can run any thing he wants. no paper work.

But I would strongly advise he not run any prop that will allow max engine RPM during a static run. those props will over speed during flight.
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Craig Catto builds my props. He knows props....
we look for 2300 RPM static and now I'm getting 2790 top. He's building a new design I hope to try soon for more speed at about same RPM. Other guys run 2800 - 2900 all day long. Old wives tale about RPMs killing Lycosaurus. One racer I know has well over 2000 hours on an O-200 running 3200 rpm!
 
Frogs97 said:
As best as I can tell, this engine on the PA-28-140 can be rated at 140hp or 150hp and the only differentiation is that the 140hp is at 2450 rpm and the 150 hp is at 2700 rpm. Is that right? So if I'm in a 140 that only goes to 2400-2500 rpm at WOT, then is that an indication it is putting out 140hp? If so, what is the limiting factor holding the rpm down?
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You are talking about two different RPM ratings. What your engine does at WOT sitting still is called static RPM. The TCDS says it must not be more than 2450. That is determined by your propeller. The other rating is your redline. There is no such thing as a 140HP O-320-E2A. They are 150HP engines unless modified for 160HP. BUT... in the PA28-140, the engine has been derated to 140HP by placing a redline at 2450RPM on the Tach.
 
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