REFLECTOR: IO-390

[Grigore Rosu]

Here is some more info on IO-390s, this time from Aero Sport Power:

"In regards to the IO-360 versus the IO-390.  Most builders go with the
IO-390 as it is the same engine as the IO-360 with a bigger bore and more
HP.  I have one IO-360 200HP engine that has been here for awhile for the
reason you mentioned.  More expensive with less HP."

They offered me the same price on that 200HP IO-360 as for the IO-390
($32.5k) in case I want to take it, which is about $4k less than the
original price of the IO-360!  John was right that Aerosport are very
honest: economically speaking, their interest would be to get rid of the
IO-360 making 4k profit; yet, they tell me straight that the IO-390 is
better.  I like these guys.  However, their price for the IO-390 is slightly
higer than Mattituck's ...

Richard, I would like to see your pictures.  Also, who should I contact at
Velocity about the modified stacks?

Thank you,
Grigore

On Mon, Mar 17, 2008 at 4:41 PM, Richard J. Gentil <
richard at naples-air-center.com> wrote:

> Grigore,
>
> I would not let the little extra work make you to change from a 360 to a
> 390, the work is minor.
>
> Velocity should now have the pattern for the stacks, so they will do that
> part for you. You will need to see from Mattituck what solutions they have
> on the throttle body to see if they can have it face aft on the engine,
> which would be forward on the Velo. Otherwise I can send you a couple of
> pictures of what I did in order to build my scoop. The only reason I had to
> build a scoop was where I positioned the engine, I could not get a 3" Skat
> hose from the Naca to the intake.
>
> Richard
>
>
> Grigore Rosu wrote:
>
> Richard,
>
> Hm, it looks like its installation involves some non-standard issues, so
> it would probably be safer for me to go with the more standard IO-360 ...
> Not that I'm affraid of new, but I've spent so much time building the
> airframe, that I am very anxious to fly now ... the more standard the
> better.
>
> Thanks alot,
> Grigore
>
> On Mon, Mar 17, 2008 at 3:10 PM, Richard J. Gentil <
> richard at naples-air-center.com> wrote:
>
> > Grigore,
> >
> > I have the TMX-390 which was the show piece at Mattituck's venue at Sun
> > 'n Fun. I did have Velocity custom modify the intake and exhaust stacks for
> > the engine. There was an IO-390-X there on the field at the time so they
> > were able to modify the stacks.
> >
> > Another issue with the TMX-390 was that I had the intake for the
> > throttle body facing the prop, which meant that I had to a scoop
> > modification to the lower cowl.
> >
> > Richard
> >
> > Grigore Rosu wrote:
> >
> >  I asked Mahlon Russell of Teledyne Mattituck (their tech expert) about
> > the IO-390 engine that they have for sale (see http://www.mattituck.com/,
> > click on Experimental Engines) for about $32k.  Here is his answer:
> >
> > " The IO-390 has the same footprint as the 200 HP IO-360-A1B6, except
> > the prop governor mounts on the front left half of the crankcase, rather
> > then the rear of the accessory housing. If you are considering an angle
> > valve Lycoming style engine in the 200HP range, the 390 is really the only
> > way to go. As you have already noticed, it is significantly less money to
> > acquire and has the additional 10 HP. I can see no reason the 390 wouldn't
> > work for you, in every aspect as compared to a 200HP engine, as long as the
> > governor location isn't an issue for your cowling/nacelle design.
> > "
> >
> > Any thoughts on this?  Can one just bolt an IO-390 instead of the 200HP
> > IO-360?  Can one just use the engine kit provided by the Velocity factory,
> > or one needs something else?
> >
> > Thank you,
> > Grigore
> >
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