Installing an IOX-360 or O-360

[dnickerson46]

What are the opinions of installing an IOX-370 or O-360 in an RV-9(A)? These engines produce more HP than the recommended HP for this aircraft and of course generate more stress and higher airspeeds. Are there any downsides?

 

[RV8JD]

There are no structural design reasons that preclude a Lycoming 180 HP engine from being installed in the RV-9/9A, as long as Vno (180 MPH IAS) and Vne (210 MPH TAS) are obeyed by the pilot. Regardless of engine power, the pilot must ensure that he/she does not exceed the design speeds at all altitudes.

See this post:

Dreaming of what engine for my RV9A

I am dreaming about what engine would be good for my new to me RV9A flying aircraft that presently has a 0-320 B1A engine installed. I plan to remove this engine and either rebuild it myself or may be upgrade to a higher HP engine instead. For you RV 9 folks what would be your dream engine over...

vansairforce.net

There are several -9/9As with 180 HP Lyc's.

 

[riobison]

I have a 9A with O320 and 9.0 cr. Im seriously thinking of going with as a minimum a stroked O340. It does perform good with 160+ hp but more for the long climbs would certainly be nice.

For 12 yrs I had an RV 4 with 180 hp O360 and I do miss the performance and yes, if I didnt know what the difference is it wouldn't be a big deal. But I do know

 

[riobison]

If you have room in your budget, go with the IOX-370