REFLECTOR: IO-390

[Richard J. Gentil]

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 <mailto: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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