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  #1  
Old 03-11-2021, 05:31 PM
Lucky Aviation Lucky Aviation is offline
 
Join Date: Nov 2017
Location: Foster Kentucky
Posts: 26
Default YIO-390-A3B6 in an RV-8

I believe that I need some help here, I have ordered a YIO-390-A3B6 to install in my RV8. Is there anyone out there who has done this that my be able to offer some wisdom? I am getting a little help from Vans, but not too much. I originally ordered the engine with an Airflow performance injection system, will this fit properly in the cowling or is there modifications that will need to be made? Should I have ordered the Avstar?
I am trying to figure out what I need to order for my firewall forward kit at this time. Any help would be very much appreciated.
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  #2  
Old 03-11-2021, 06:45 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,947
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If you want to use the snorkel, the AirFlow Performance will not work (it hits the bottom of the cowl). I ordered my IO-360-M1B with the AirFlow system as I prefer it. Thunderbolt was nice enough to exchange it with the standard Precision unit after I sent them photos of it hitting the bottom of the cowl. It seems I was not the first RV-8 builder to have the issue.

Assuming you got your 390 from Vanís Iím very surprised Thunderbolt agreed to use the AirFlow system for your engine

If you really want to use the Airflow System you will be doing some significant mods to the cowl and snorkel (much more than if on an RV-14). The other option is to not use the snorkel and add an engine air inlet on the bottom of the cowl, along with a new filter setup. I suggest a better path is to just get the Precision system.

Carl
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  #3  
Old 03-11-2021, 07:21 PM
Lucky Aviation Lucky Aviation is offline
 
Join Date: Nov 2017
Location: Foster Kentucky
Posts: 26
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Thanks Carl, I did order the 390 through Vans, I also have the cowl without the snorkel.
I am not sure of the fit with this.
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  #4  
Old 03-11-2021, 07:27 PM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,947
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Quote:
Originally Posted by Lucky Aviation View Post
Thanks Carl, I did order the 390 through Vans, I also have the cowl without the snorkel.
I am not sure of the fit with this.
So you have the cowl that has a separate engine air inlet?
Carl
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  #5  
Old 03-11-2021, 08:21 PM
RYOUNG RYOUNG is offline
 
Join Date: Feb 2010
Location: NC
Posts: 60
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I have the YIO-390A3B6 on order from Vanís for my RV-8 set to deliver end of April. It will have stock Avstar/precision fuel injection. No mods should be required for the smooth bottom lower cowl with stock snorkel as used for the stock 200hp angle valve engine install. The other differences from the stock 200hp angle valve install include forward mounted prop governor, possibly using firewall mounted 13 row oil cooler and tight baffle to cowl clearance at the #2 cylinder. Still not sure about exhaust differences if any. I plan to order firewall fwd items as I go using Vanís packing lists for the 200hp angle valve firewall forward for the RV-8 and the YIO-390A3B6 firewall forward for the RV-14. Take this for what it is worth. Good luck!
__________________
Robert

RV-3B Flying
Wagabond Flying
RV-8 Tail completed, QB Fuselage in progress
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  #6  
Old 03-13-2021, 06:37 PM
Lucky Aviation Lucky Aviation is offline
 
Join Date: Nov 2017
Location: Foster Kentucky
Posts: 26
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Thanks Robert, sounds like we are in the same boat.
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