VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics


Go Back   VAF Forums > Model Specific > RV-8/8A
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 08-04-2018, 03:51 PM
humptybump's Avatar
humptybump humptybump is offline
 
Join Date: Feb 2011
Location: Eastern Shore of Virginia
Posts: 3,047
Default Fitting an O-360 into an RV-8 O-320 cowl

For those who were not aware, Vans Aircraft created a different cowl for the O-360 and the O-320. While there are not many RV-8's with an O-320 there are fewer still with an O-320 and the O-320 cowl.


Anyone who has this combination and wishes to upgrade to an O-360 should plan to get professional help ... preferable of the psychiatric kind.


I am thankful to say I traveled this unimproved runway and and emerged from the darkness with my wheel pants intact.


I'll be writing about it on my blog. Here is a short introduction to the process.


http://elder.ninja/blog/p/7504


I'll add to this thread with a couple more updates as I write up the gory details.


For the curious, here is the decision flow I went through ... (albeit not in a linear path)

__________________
- Glen, ESVA
RV-8 FP IFR | Track my RV-8 | 53VG

Last edited by humptybump : 08-04-2018 at 04:05 PM.
Reply With Quote
  #2  
Old 08-05-2018, 01:20 PM
WA85 WA85 is offline
 
Join Date: Apr 2010
Location: Madison, AL
Posts: 124
Default

I used a 360 cowl for my IO-320 installation. The 360 cowl is about 1.5" deeper at the chin scoop than the 320 cowl.
Reply With Quote
  #3  
Old 08-05-2018, 07:24 PM
humptybump's Avatar
humptybump humptybump is offline
 
Join Date: Feb 2011
Location: Eastern Shore of Virginia
Posts: 3,047
Default

Quote:
Originally Posted by WA85 View Post
I used a 360 cowl for my IO-320 installation. The 360 cowl is about 1.5" deeper at the chin scoop than the 320 cowl.
Eric, you are fortunate to branch at question #2 in the flow
__________________
- Glen, ESVA
RV-8 FP IFR | Track my RV-8 | 53VG
Reply With Quote
  #4  
Old 08-06-2018, 08:10 AM
Low Pass's Avatar
Low Pass Low Pass is offline
 
Join Date: May 2006
Location: Houston
Posts: 1,900
Default

Been there, done that. Actually, have been thinking about stepping up the size once more to a -540 or something like that. So the pain isn't permanent. It'll fade.
__________________
Bryan

Houston

Last edited by Low Pass : 08-06-2018 at 08:12 AM.
Reply With Quote
  #5  
Old 08-07-2018, 10:51 AM
humptybump's Avatar
humptybump humptybump is offline
 
Join Date: Feb 2011
Location: Eastern Shore of Virginia
Posts: 3,047
Thumbs up Custom O-360 airbox for an O-320 cowl

This is how the "magic" happened ... it's a bit like making sausage.

I've finally sat down and written a blog post that describes how I used a 3D printer to create a mold for a fiberglass and carbon fiber airbox. The airbox takes the same filter as Vans supplies for IO-360 installations. The airbox fits an O-360 with an MA-4-5 carburetor within a RV-8 with an O-320 cowl.



The airbox and engine now has 5 hours and is performing very well.

Below is the a link to the blog post which has more (and larger) pictures. The blog post also has links to PDFs of two important internet resources which helped my with both the design and fabrication.

Blog post: http://elder.ninja/blog/p/7512
__________________
- Glen, ESVA
RV-8 FP IFR | Track my RV-8 | 53VG

Last edited by humptybump : 08-07-2018 at 02:46 PM.
Reply With Quote
  #6  
Old 08-07-2018, 10:56 AM
crabandy crabandy is offline
 
Join Date: Jan 2010
Location: Ottawa, Ks
Posts: 1,880
Default

Glen, glad to hear itís flying again! Iíve been patiently awaiting the airbox write up!
__________________
RV 7 300 hours and counting
12/17 donation
Reply With Quote
  #7  
Old 08-07-2018, 11:46 AM
M McGraw's Avatar
M McGraw M McGraw is offline
 
Join Date: Dec 2012
Location: Greenback, TN
Posts: 388
Default Airbox

I had a chance to see that airbox up close. The quality is superb. He described how he printed a mold then remove the mold with heat. I plan to learn more about 3D printing.

I am courious of your impression of your airplane with the new engine. Handling, performance, range?
__________________
Marvin McGraw, 5TN4
RV-14. #140039 Complete
Flight hours: 175+
2018 Dues Paid
Reply With Quote
  #8  
Old 08-07-2018, 11:58 AM
humptybump's Avatar
humptybump humptybump is offline
 
Join Date: Feb 2011
Location: Eastern Shore of Virginia
Posts: 3,047
Default

Quote:
Originally Posted by M McGraw View Post
I am curious of your impression of your airplane with the new engine. Handling, performance, range?

I'm still in the engine break-in phase. That said, its an RV-8 with a 180hp O-360. It's probably just like all the others. I'm just joining a well populated club.



Of course, being able to directly compare the same airframe with a 150hp and now with 180hp, it a different airplane now.


Not only is there 30hp more but there is a whole lot more power on take off because a 2017 Catto is a very different design than a 2012 Catto.



__________________
- Glen, ESVA
RV-8 FP IFR | Track my RV-8 | 53VG
Reply With Quote
  #9  
Old 08-07-2018, 02:07 PM
fl-mike's Avatar
fl-mike fl-mike is offline
 
Join Date: Jul 2005
Posts: 943
Default

Been there, done that on a 6. Swapping the scoops was not that bad, once you spend some time thinking about how to make it look seamless.
  1. Use a die grinder with cutoff wheel to cut off old scoop with smaller "bite" than new scoop flange
  2. Make a bunch of 1" square aluminum "washers" with a 3/32" hole in the middle for a cleco
  3. Trace new scoop outline onto cowl (centered)
  4. Enlarge the "bite" in cowl to the line traced above
  5. Use 15 or so of the two "washers" sandwich and cleco spaced a few inches around the cowl in the cut line to hold the scoop in place and flush with the cowl
  6. Bond together on the inside using fiberglass patches between the washer clamps
  7. Remove the washer clamps and build up the joint
  8. Fill the gap and finish
Build a new airbox per the O-360 instructions.
__________________
Mike W
Venice, FL
RV-6A. Mattituck TMX O-360, FP, GRT Sport EFIS
N164WM
N184WM reserved (RV-8)....tail kit done, slow-build wing done, slow-build fuselage started.
Reply With Quote
  #10  
Old 08-07-2018, 02:43 PM
humptybump's Avatar
humptybump humptybump is offline
 
Join Date: Feb 2011
Location: Eastern Shore of Virginia
Posts: 3,047
Default

Moke, there were times when I considered cutting the pretty painted cowl. There were also times when I considered reinstalling the O-320.

Ultimately, the airbox was the solution as it left the finished airplane unaltered.

Of course, had I known there was such a thing as an RV-8 O-320 lower cowl and how it differed from the O-360 lower cowl, I probably would never have started the engine project in the first place.
__________________
- Glen, ESVA
RV-8 FP IFR | Track my RV-8 | 53VG
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 02:25 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.