REFLECTOR: IO-390
Richard J. Gentil
richard at naples-air-center.com
Mon Mar 17 18:59:11 CDT 2008
Grigore,
Contact Scott about the stacks.
Richard
P.S. I will email you directly the pix.
Grigore Rosu wrote:
> 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 <mailto: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
>> <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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