RV-6 Engine change

[rvbuilder2002]

Originally Posted by az_gila

I think your motor mount comment is for the RV-7 series only.

The RV-6 motor mounts are the same for O-320 and O-360 engines. I changed in mid-build with no mount problems.

There are two cowl lengths though depending on the length of the prop spacer, and the depth of the "carb scoop" between the two models changes, but a replacement scoop is available that can be spliced onto the existing cowl.

And more specifically...... All the side by side engine mounts are the same except when installing an O-320 on an RV-7(A). In that one case only, a longer mount is used to move the lighter engine fwd. The difference is within the usable size of the cowl so the cowl is trimmed slightly less during installation.

[LifeofReiley]

Back when I finished up the 2009 7A with a 320 the cowling Van's shipped me was labeled 235 cowling as was the shipping/packing slip. It looked narrower... not as "fat" as the 360 cowl. sure looked good on the plane. And that extra 2.5" firewall clearance made it easy to work on the back side of the engine.

[jclark]

Originally Posted by mosquito

A 'stroker' O-340 with the Titan crankshaft should be a direct replacement for your O-320, same size and weight, but with O-360 power (180hp). That's what I intend to replace my O-320 with one day (hopefully in the very, very distant future).

-jon

I have converted my RV6 from an O-320 (160 HP) to and O-340 Stroker (~180 HP). My RV6 is "old school" and has the tight O-320 cowl so an O360 carb would NOT fit.

I have had issues with the originally supplied 340 carburetor (M-S Experimental for the 340). I didn't like the EGT spread. Lots of work with ECI to get it dialed in but we decided that I would change over to fuel injection.

Working with Don at Airflow Performance on a new fuel injection product for the 340 that will fit within the tight O-320 cowl of the earlier RV6's if that is what you have. (This should fit in some of the tight RV4 cowls as well, I believe.)

We hope to have some data in a week or so that can be shared. If not then right after the holidays. Test flight with the prototype (and resultant data) showed significant improvements. The engine pulls STRONG!

Now, if your cowl is the later/larger cowl that accommodates the 360 then you are probably good to go.


James

[hohocc]

Originally Posted by rvbuilder2002

And more specifically...... All the side by side engine mounts are the same except when installing an O-320 on an RV-7(A). In that one case only, a longer mount is used to move the lighter engine fwd. The difference is within the usable size of the cowl so the cowl is trimmed slightly less during installation.

Are there any examples out there of the long RV7 mount being used on an RV6? Seems it would be a logical thing to consider with a wood prop to keep c of g forward.

[rvbuilder2002]

Originally Posted by hohocc

Are there any examples out there of the long RV7 mount being used on an RV6? Seems it would be a logical thing to consider with a wood prop to keep c of g forward.

None that I am aware of.
It might be a bit extreme for the RV-6. It works for the RV-7 because the fuselage is a little bit longer, and the emp. is a little bit heavier.