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  #1  
Old 08-07-2020, 06:33 PM
WingnutWick's Avatar
WingnutWick WingnutWick is offline
 
Join Date: Jun 2013
Location: Lemoore
Posts: 208
Default RV-6A engine swap.

Hi all,

I am looking into swapping out the O-320 H2AD on the RV-6A at some point with something with a little more spank to it as the 6 feels totally gutless compared to my RV-8 O-360. I am curious what the experience is with something like putting on O-360 onto a pre-existing O-320 setup. What (other than the obvious) is entailed? What would have to change? Any particular variants that would work better than others?

Thanks for the input folks!

Charles
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F-18E/F, Mk.58, CF-5
RV-8 O-360

Last edited by WingnutWick : 08-07-2020 at 06:41 PM.
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  #2  
Old 08-07-2020, 07:09 PM
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rvbuilder2002 rvbuilder2002 is offline
 
Join Date: Jul 2005
Location: Hubbard Oregon
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Quote:
Originally Posted by WingnutWick View Post

What would have to change?
Exhaust, baffling, air box, and lower cowl ( or cut off the induction scoop and install an O-360 one.
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  #3  
Old 08-07-2020, 09:48 PM
Coaltowngarage Coaltowngarage is offline
 
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Location: Altoona,AL
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When I ordered my engine mount a few weeks back, they told me that the 320 mount was built 2 inches longer for weight and balance. Would that put you nose heavy?

Last edited by Coaltowngarage : 08-07-2020 at 09:51 PM.
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  #4  
Old 08-08-2020, 09:25 AM
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rvbuilder2002 rvbuilder2002 is offline
 
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Quote:
Originally Posted by Coaltowngarage View Post
When I ordered my engine mount a few weeks back, they told me that the 320 mount was built 2 inches longer for weight and balance. Would that put you nose heavy?
The O-320 Mount is an option only used on the RV-7
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.

Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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  #5  
Old 08-09-2020, 10:56 AM
Coaltowngarage Coaltowngarage is offline
 
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Location: Altoona,AL
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Quote:
Originally Posted by rvbuilder2002 View Post
The O-320 Mount is an option only used on the RV-7
Im confused. I am building a 6. I ordered my mount in June. Thats just what they told me.
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  #6  
Old 08-09-2020, 02:00 PM
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Michael White Michael White is offline
 
Join Date: Jan 2005
Location: Cartersville, Georgia KVPC
Posts: 945
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Quote:
Originally Posted by Coaltowngarage View Post
Im confused. I am building a 6. I ordered my mount in June. Thats just what they told me.
In that case they didn't fully understand that you're building a six...the six was designed for the O-320, and only had one mount. The seven was designed with the O-360 in mind because so many builders were putting 360's in their sixes. Putting a 360 in the six moves the CG forward (not necessarily a bad thing)...putting a 320 on a seven (without using the longer mount) moves the CG back (not necessarily a good thing).
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  #7  
Old 08-09-2020, 02:39 PM
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DeeCee 57 DeeCee 57 is offline
 
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Location: LSZF
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as far as I know, depending on your serial, you might have, or not, a -7 engine mount (check for reinforcing gussets)... mine has (as well as pre-punched wing skins and -8 tail).
One thing to consider is, depending of which you have right now, having to replace the engine mount... and the matched landing legs (changed from conical to dynafocal on my -4 and had to replace the lot)...
Gotta say, the 180 ponies on a “light” airframe is a nice combination
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RV-6.9 #25685, slider, O-360-A3A (carb/dual Lightspeed II), MTV-12-B, HB-YLL owner & lover
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  #8  
Old 08-09-2020, 03:06 PM
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zilik zilik is offline
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Location: Pine Junction, CO
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Quote:
Originally Posted by Michael White View Post
In that case they didn't fully understand that you're building a six...the six was designed for the O-320, and only had one mount. The seven was designed with the O-360 in mind because so many builders were putting 360's in their sixes. Putting a 360 in the six moves the CG forward (not necessarily a bad thing)...putting a 320 on a seven (without using the longer mount) moves the CG back (not necessarily a good thing).
Moose is correct!
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  #9  
Old 08-09-2020, 09:55 PM
Coaltowngarage Coaltowngarage is offline
 
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Location: Altoona,AL
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Ok, good to know. I was hoping for the option to possibly upgrade to a 360 some day. Based on what they told me I had figured i would just have to get a new mount and re-do pretty much everything firewall forward including the cowl if that day ever comes.
They ask for the serial number and mine dates to 1991. Something i can quit worrying about now

Last edited by Coaltowngarage : 08-09-2020 at 09:58 PM.
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