longranger
Well Known Member
I'm planning on an IO-360-M1B (horizontal induction) on my tailwheel RV-7, and I like the looks and the apparent performance gains with the James cowl & plenum, so it looks like the "Extended Cowl for Forward Facing Injected Engines" is the right one. I'm planning on the Hartzell Blended Airfoil C2YR propeller, so it looks like I'll need a 2.5" prop extension as well.
I would also like to allow myself one piece of bling and go with the Cummins spinner. I've done a little research, and haven't run across anyone on VAF with that spinner and a James cowl on a RV-7. (I could find no posts containing both James and Cummins.) With the Cummins spinner using Vans backplate, I can't see where there would be any issue with the fit of the Cummins spinner vs Vans spinner, but I figure it can't hurt to ask.
I did run across a few posts where 2.25" extensions were mentioned, and at least one post where someone used a 2.625" extension. Should I just wait until I've fitted the cowl, then just order what I need, or is there is enough range in the fit of the cowl to just make it work with the 2.5? I'd really like to get this right the first time...
I would also like to allow myself one piece of bling and go with the Cummins spinner. I've done a little research, and haven't run across anyone on VAF with that spinner and a James cowl on a RV-7. (I could find no posts containing both James and Cummins.) With the Cummins spinner using Vans backplate, I can't see where there would be any issue with the fit of the Cummins spinner vs Vans spinner, but I figure it can't hurt to ask.
I did run across a few posts where 2.25" extensions were mentioned, and at least one post where someone used a 2.625" extension. Should I just wait until I've fitted the cowl, then just order what I need, or is there is enough range in the fit of the cowl to just make it work with the 2.5? I'd really like to get this right the first time...