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  #1  
Old 08-17-2020, 04:18 PM
Lucky Aviation Lucky Aviation is offline
 
Join Date: Nov 2017
Location: Foster Kentucky
Posts: 23
Default IO-390 in RV8

I am considering installing a IO-390 in my RV8, I understand that there are challenges, are there any builders out there that have done this? Have you any advice?
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  #2  
Old 08-17-2020, 05:13 PM
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N546RV N546RV is offline
 
Join Date: Aug 2010
Location: Brookshire, TX
Posts: 1,065
Default

Paging Dan Horton to the engineering lounge...
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Philip
-8 fuselage in progress (remember when I thought the wing kit had a lot of parts? HAHAHAHAHA)
http://rv.squawk1200.net
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  #3  
Old 08-17-2020, 05:35 PM
Northernliving Northernliving is offline
 
Join Date: May 2005
Location: Boston, MA
Posts: 500
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Quote:
Originally Posted by Lucky Aviation View Post
I am considering installing a IO-390 in my RV8, I understand that there are challenges, are there any builders out there that have done this? Have you any advice?
Mark Spickard put one nine years ago. I'm sure there are others.
https://www.youtube.com/watch?v=r2IeuNGtn94
https://www.youtube.com/watch?v=tqSpCoZvlqs
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Boston, MA
RV8 Based at ORH - Purchased
RV8 - The Project #83313 - Under Construction
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  #4  
Old 08-17-2020, 05:46 PM
Lucky Aviation Lucky Aviation is offline
 
Join Date: Nov 2017
Location: Foster Kentucky
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Default

Thanks Brian, this helps!
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  #5  
Old 08-17-2020, 07:25 PM
scsmith scsmith is offline
 
Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,778
Default IO-390-EXP 119

I don't think it is a secret anymore that Van's is about to announce that they will expand the range of recommended engines to include the IO-390-EXP 119.

Along with that announcement, I would suspect over time the emergence of factory-offered accessories to make the installation more straightforward than it was for the pathfinders like DanH and others.

This is exciting enough to make me a repeat offender in the coming year or two.
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Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
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  #6  
Old 08-18-2020, 10:50 AM
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walter walter is offline
 
Join Date: Mar 2005
Location: Mansfield TX
Posts: 339
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I have an Barrett IO-390-X in my 8A. I used the RV-14 baffle kit and it went on like a glove. I have a Whirlwind 74HRT prop, dual P-Mags dual Garmin G3X touch, GTN 650 with Autopilot, aft mounted Garmin Transponder, aft mounted Garmin radio and ELT. Firewall mounted EarthX battery and Showplanes Fastback. Empty weight is 1119 #. and useful load 681 #. Full fuel and single pilot (190 #) I need 5 # in the aft baggage compartment to stay within CG on takeoff. if I use all my fuel I need 10 #. to stay within CG for landing. Nose Gear Weight: 326, Left main: 394, Right main: 399. Hope that helps. First flight is soon.
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Flying RV-8A - Fastback, IO-390, G3X Touch, 74 HRT
Prior RV-7A Build Log
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  #7  
Old 08-18-2020, 11:25 AM
Freemasm Freemasm is offline
 
Join Date: Nov 2017
Location: Orlando
Posts: 287
Default I'm not saying I'm right

Got that out of the way. One annoying thing about forums people, want to argue that they are correct or want their choices validated. I'm not doing that. Also, I'm building something other than an 8.

Why wouldn't you consider a stroked straight valve or a higher compression straight valve engine from one of the custom shops? It just seems so much easier installation for a very small, if any WOT performance hit. Would be a little bit lighter, BTW.

Few will argue that the Lycoming straight valve engines are as close to bullet proof as they get. Yes, I'm aware that some design margin is utilized with said mods but there's enough run history that eases that concern. The aforementioned options would save so much build time and anguish in an 8.

Once again, I'm not saying I'm right but I'm going with a stroked, injected, improved sump, EI, EFI, straight valve engine that will make almost the exact same HP @2700. The better torque curve (an under valued characteristic) should really be evident in cruise settings. The build would seem so much simpler.

I like hearing other's reasoning. I'm curious. Please fire away.
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  #8  
Old 08-18-2020, 11:35 AM
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DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
Posts: 9,812
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Quote:
Originally Posted by Freemasm View Post
The aforementioned options would save so much build time and anguish in an 8.
What anguish? A stock 390 installs just like a stock angle valve 360.

I gave myself lots of extra work for custom stuff, but I'm crazy.
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RV-8 SS
Barrett IO-390
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  #9  
Old 08-18-2020, 11:58 AM
Taltruda Taltruda is offline
 
Join Date: Oct 2017
Location: Las Vegas, NV
Posts: 588
Default

Quote:
Originally Posted by Freemasm View Post
Got that out of the way. One annoying thing about forums people, want to argue that they are correct or want their choices validated. I'm not doing that. Also, I'm building something other than an 8.

Why wouldn't you consider a stroked straight valve or a higher compression straight valve engine from one of the custom shops? It just seems so much easier installation for a very small, if any WOT performance hit. Would be a little bit lighter, BTW.

Few will argue that the Lycoming straight valve engines are as close to bullet proof as they get. Yes, I'm aware that some design margin is utilized with said mods but there's enough run history that eases that concern. The aforementioned options would save so much build time and anguish in an 8.

Once again, I'm not saying I'm right but I'm going with a stroked, injected, improved sump, EI, EFI, straight valve engine that will make almost the exact same HP @2700. The better torque curve (an under valued characteristic) should really be evident in cruise settings. The build would seem so much simpler.

I like hearing other's reasoning. I'm curious. Please fire away.
I'm with you. .I am looking to keep the parallel valve engine, and tweak it. I would rather give up a few hp for the lighter weight. .and with the hotrod shops out there, I don't think you really have to give up anything! I understand the guys going turbo, supercharger or nitrous wanting to use the angle valve engine. . I believe they are easier to keep the cylinders cool.
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Las Vegas
RV-8 empenage finished 10-2020

Wings Started.. 11-2020
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  #10  
Old 08-18-2020, 12:03 PM
Freemasm Freemasm is offline
 
Join Date: Nov 2017
Location: Orlando
Posts: 287
Default

Quote:
Originally Posted by DanH View Post
What anguish? A stock 390 installs just like a stock angle valve 360.

I gave myself lots of extra work for custom stuff, but I'm crazy.
My personal anguish is that I'm an ill-informed idiot. Was told the RV-8 only had factory options for the O-360. Went and looked at the Vans site so that's at least outdated if not always wrong.

Sorry. Opinions on PP selection process would still be welcome and appreciated.
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