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  #1  
Old 02-22-2012, 10:30 AM
paul mosher
 
Posts: n/a
Default IO-390

Can anyone explain why it would be worth spending $40,000 for a IO-390?
How much is really gained over using a 180 hp IO-360? I'm really just concerned with cruise speeds.
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  #2  
Old 02-22-2012, 11:15 AM
schristo@mac.com's Avatar
schristo@mac.com schristo@mac.com is offline
 
Join Date: Sep 2007
Location: WA
Posts: 993
Default Price has gone through the roof...

I bought mine at the same cost as a similar 200 hp angle valve several years ago; now an injected 180 hp costs nearly as much as I payed! Prices of all engines have been trending up steeply lately but the 390 is getting way too expensive... If I was buying today I would focus an IO375.
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Stephen

RV7 powered by a lycoming thunderbolt IO-390
turning a whirlwind HRT prop

with more hours flying than building... 2,450 on the hobbs!
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  #3  
Old 02-22-2012, 12:04 PM
Bob Axsom Bob Axsom is offline
 
Join Date: Mar 2005
Posts: 5,685
Default I think if you have to ask, it's not worth it

If you are interested in looking at camparable speeds in RVs of various types go to www.sportairrace.org, click on Records and Stats, then League Statistics, then All Speeds by Aircraft Type and an Excel file will be downloaded to your computer that you can scroll through at your leisure than delete. Most of the RVs in the RV Gold class have 390s and the RV Blues have 360s (some IO some O or generally 200hp angle valve or 180hp parallel valve). The exceptions are John Huft and Dave Anders who have 360s but they kick backside in the RV Blue class so bad they moved up and kicked some 390s. If you're not racing and are on a budget as most of us are the 390 is hard to justify.

Bob Axsom

P.S. RV Red is for RVs with 320s or smaller engines.

Last edited by Bob Axsom : 02-22-2012 at 12:08 PM.
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  #4  
Old 02-22-2012, 12:42 PM
MCA's Avatar
MCA MCA is offline
 
Join Date: Jun 2005
Posts: 707
Default

When I bought my -390 in '05 it was several thousand less than a 200HP angle valve -360. At the time the -390 was exp only but now it is certified. Perhaps that made a difference.
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Marc Ausman
RV-7 980 hours, IO-390, VP-X (sold)
RV-8 (flying a friend's)
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Last edited by MCA : 02-22-2012 at 12:45 PM.
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  #5  
Old 02-22-2012, 01:13 PM
hydroguy2's Avatar
hydroguy2 hydroguy2 is offline
 
Join Date: Sep 2006
Location: Townsend, Montana
Posts: 3,179
Default

It all depends on how much fuel you want to burn. At cruise, burning 8.5gph most all the -7's will be 175kts TAS (give or take) no matter what engine is under the hood. If you start pouring the coal to it the IO-390 will pull away.

So pick your mission and pay at the vendor and again at the pump. Horsepower costs money, how fast do you want go.

BTW I wanted a 390 and then I started saving for a IO-375.....then looking at my wallet, reality set in. I ended up with a 180hp parallel valve O-360 but modified with 9-1pistons, Pmags and Superior cold sump & AFP injection. Cost ready to run <$21000. It does ok in the horsepower dept. I see 189ktsTAS, but prefer not to look at fuel flow while doing it.
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  #6  
Old 02-22-2012, 01:48 PM
Bob Axsom Bob Axsom is offline
 
Join Date: Mar 2005
Posts: 5,685
Default Oh me

Quote:
Originally Posted by hydroguy2 View Post
I see 189ktsTAS, but prefer not to look at fuel flow while doing it.
I can't break 185 no matter what I do in level flight. Some day I am going to have to address the power end of speed, Sigh ...

Bob Axsom
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  #7  
Old 02-22-2012, 02:02 PM
paul mosher
 
Posts: n/a
Default xpio-360

The xp-io-360 from superior can still be had from superior for $15k less, can it not?
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  #8  
Old 02-22-2012, 02:20 PM
islandmonkey's Avatar
islandmonkey islandmonkey is offline
 
Join Date: May 2009
Location: Zurich, Switzerland
Posts: 538
Default

Quote:
Originally Posted by Bob Axsom View Post
I can't break 185 no matter what I do in level flight. Some day I am going to have to address the power end of speed, Sigh ...

Bob Axsom
Bob, I bet you have plans already in place on the power end of your 6a. If not, start on the plans now and look at the timeline for completion. This will give you a good wintertime project that will keep you busy after the racing season has finished. If your up for it and I can make it over to the States I would be very happy to give you a helping hand on one of the stages.
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Brit working in Zurich, Switzerland.
1500 hour pilot and ex instructor and examiner.
RV-4 s/n 4572 Emp Kit.
RV-3B s/n 11460 Emp Kit. (In storage).
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  #9  
Old 02-22-2012, 03:01 PM
hydroguy2's Avatar
hydroguy2 hydroguy2 is offline
 
Join Date: Sep 2006
Location: Townsend, Montana
Posts: 3,179
Default

Quote:
Originally Posted by paul mosher View Post
The xp-io-360 from superior can still be had from superior for $15k less, can it not?
not new and ready to fly

I think you can find a kit for somewhere around that number, but you still have stuff to put on it to be ready to fly. When I was shopping a few years ago, kits ere about $14K but ready to fly was closer to $19....then add a few extra goodies and I wasn't able to get it under $21. Then by the time I saved a little more money the price of engines kept creeping up faster than I as collecting $.
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Brian, N155BKsold but bought back.
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  #10  
Old 02-24-2012, 12:19 PM
Bob Axsom Bob Axsom is offline
 
Join Date: Mar 2005
Posts: 5,685
Default Not Really

Quote:
Originally Posted by islandmonkey View Post
Bob, I bet you have plans already in place on the power end of your 6a. If not, start on the plans now and look at the timeline for completion. This will give you a good wintertime project that will keep you busy after the racing season has finished. If your up for it and I can make it over to the States I would be very happy to give you a helping hand on one of the stages.
I'm planning an all out effort to win it all this year then I may focus on travel. I feel like this is a transition time near the end of my life so I am not hard over one way or another. If I continue with racing intensity I may get a 390 and give the golden boys a run. I also have considered going for some world records through the NAA (and FAI), try to fly around the world or just become a meandering bum with an airplane.

But you get well and come for a visit anyway.

Bob Axsom
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