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  #1  
Old 01-18-2022, 09:33 AM
77bonanza 77bonanza is offline
 
Join Date: Jan 2016
Location: Gravois Mills, MO
Posts: 50
Default RV14A Lower Cowling Revision for 4 into 2 Exhaust

Does anyone have any photos/guidelines for altering the lower cowling on a RV14A from a 4 into 1 exhaust system into Vetterman's 4 into 2 exhaust systems for a IO390-EXP177 A3B6 Thunderbolt engine? Photos would be especially appreciated.

Thanks.

Last edited by 77bonanza : 01-18-2022 at 09:37 AM.
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  #2  
Old 01-18-2022, 11:51 AM
jeffw@sc47's Avatar
jeffw@sc47 jeffw@sc47 is offline
 
Join Date: Aug 2014
Location: Simpsonville, SC (SC47)
Posts: 424
Default Vetterman's 4 into 2 cowl exhaust cut outs

Start with an approximation of the cutouts that you know will need to be enlarged by way of successive cuts, i.e. start knowing the cut outs will be tight.

I enlarged both of the cut outs at least twice after the first cuts. The cowling is off now to do my first oil change and I will be enlarging the left side exhaust cut out, the photo of the cut out with the line of dots. That cut out is clear of the exhaust pipe but I want more. It should be my last cut out adjustment.

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Jeff Warren
Simpsonville, SC (@SC47 > 10nm NW Triple Tree)
RV14A (N14ZT), Ser#140195
FF 11/24/21; Phs 1 completed
Contribution made 12/9/21 (USArmy 2/67-2/70)
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  #3  
Old 01-18-2022, 02:13 PM
Nova RV Nova RV is offline
 
Join Date: Aug 2015
Location: Leesburg, VA
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I started out with the sizes in this pic and made the final a little larger to make sure the engine shake didn't cause the pipes to contact the cowling
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Chris Moon
Leesburg, VA

CFI-I ASMEL, ATP

RV-14A kit # 140243 (flying as of 11/18)

www.mykitlog.com/chrismoon/
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  #4  
Old 01-18-2022, 03:17 PM
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Bsquared Bsquared is offline
 
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Location: Southern California
Posts: 178
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Here is how I did mine. I started out with 1/2” clearance all around but opened that up to 5/8” after my first flight due to rubbing at start up and shutdown. FYI this is a 390 EXP60
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Last edited by Bsquared : 01-18-2022 at 05:52 PM.
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  #5  
Old 01-18-2022, 06:24 PM
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Jetmart Jetmart is offline
 
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Location: Windsor, Ontario
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Not a 14A but this is what I did for he 14 taildragger. Pipes and outlets are more visible in the 3 point position.
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Glenn Martin
Windsor, Ontario
1941 Tiger Moth
2017 Waco YMF-5
RV-14 Kit # 140694 - First Flight June 22, 2021
RV-14 A - Kit Ordered February 8, 2022
2022 Dues Paid
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  #6  
Old 01-19-2022, 09:11 AM
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DanH DanH is offline
 
Join Date: Oct 2005
Location: 08A
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Quote:
Originally Posted by 77bonanza View Post
Does anyone have any photos/guidelines for altering the lower cowling on a RV14A from a 4 into 1 exhaust system into Vetterman's 4 into 2 exhaust systems for a IO390-EXP177 A3B6 Thunderbolt engine?
Just to clarify...the "EXP177" is the 210 HP version with a one-piece intake plenum/oil sump?
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Dan Horton
RV-8 SS
Barrett IO-390
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  #7  
Old 01-20-2022, 08:06 AM
77bonanza 77bonanza is offline
 
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Location: Gravois Mills, MO
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Yes, it is that version.
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