M20J Performance with IO-390

[Htmlkid]

Im about to purchase an M20J 205 with an upgraded IO 390 engine and Im looking to see if anyone has a performance profile for this setup?

[N201MKTurbo]

Well, it seems from the new model number that it goes 4 MPH faster.

[Pinecone]

Search.  There are several threads on this and some other boards about the IO-390 conversion.

But think of this, a 231 and 252 are 210 HP also.  So should be similar to them down low, but is not much difference.   You need a LOT of HP to go faster.

[Ragsf15e]

It climbs a bit better and you get a couple of knots more.  At cruise power, you’ll only have ~7 more hp.  Roughly.  From the other folks on here, the change was noticeable mostly in climb.  Less so in cruise.

It’s a newer design and has all the improvements incorporated into the newer versions of the io-360.

[Pinecone]

I see that IO-390 as a super idea going from a 180.

Like the Extreme Decathlon.  Super is AEIO-360 180 HP, Extreme is AEIO-390 210 HP.  30 HP is a HUGE difference in take off and climb performance.  And vertical performance for aerobatic aircraft.

[Igor_U]

Yes but for M20F that is only 5% increase in the power which equals 1.6% increase of the speed. 

Climb performance would be noticeable, though.

 

 

[ZuluZulu]

@bmcconnaha

[jetdriven]

On 6/12/2023 at 8:15 AM, Pinecone said:

I see that IO-390 as a super idea going from a 180.

Like the Extreme Decathlon.  Super is AEIO-360 180 HP, Extreme is AEIO-390 210 HP.  30 HP is a HUGE difference in take off and climb performance.  And vertical performance for aerobatic aircraft.

It's limited to 5 minutes above 200hp as well. 

[bmcconnaha]

On 6/27/2023 at 3:43 PM, jetdriven said:

It's limited to 5 minutes above 200hp as well. 

If you aren't above the altitude where you're making more than 200HP in five minutes, you're doing it wrong.  

[jetdriven]

such as low level acro..

[Pinecone]

On 6/27/2023 at 6:43 PM, jetdriven said:

It's limited to 5 minutes above 200hp as well. 

Are you sure about that?

I can only find the EASA approval and it says Max Continuous of 210 HP.