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Daniel.Snow(at)wancdf.com
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 Posted: Thu Jan 25, 2007 8:11 am Post subject: Superior XP O-320 Engine - Carb Interference With Lower Cowl |
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After trimming and fitting the lower cowl of my 9A to the spinner back
plate and fuselage, I've found that I have insufficient room for the
Vans air filter. The filter is about 2-3/8" high, and the space between
the cowl and carburetor is only 1-3/4". These dimensions don't even
take into consideration the thickness of the FAB or space needed between
the FAB and cowl. The carburetor appears to be Superior's normally
supplied Precision MA-4-5, but the Authorized Release Certificate refers
to the LYC 0-360 under "Eligibility".
Has anyone experienced this problem, or does anyone have any good ideas
to work around this apparent problem? I don't think I want to go with a
shorter filter, as this would reduce the cross sectional area by more
than 50%. I also don't like the idea of removing the engine and sending
it back to Superior for refit of a different carburetor.
Thanks in advance for any suggestions or solutions.
Daniel Snow
RV-9A, Cowl
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ssamps(at)gmail.com
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| Posted: Thu Jan 25, 2007 9:03 am Post subject: Superior XP O-320 Engine - Carb Interference With Lower Cowl |
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Daniel - I think the issue you are running into is the same as outlined here. http://gikoncnsdr.blogspot.com/2006/06/rv-4-cowls.html
The -9A cowl assumes a carbd O-320. I built a -9A and there was very little room below the airbox. It sounds as though you have an o-360 carb. which I think (not sure) is bigger. Perhaps Superior would swap it. Alternatively, there must be a 7A cowl varient that would fit since they permit the bigger engines. Not what you want to hear perhaps, so I would chase down the carb details. Goodluck, Steve.
On 25/01/07, Snow, Daniel A. <Daniel.Snow(at)wancdf.com (Daniel.Snow(at)wancdf.com)> wrote: [quote]--> RV-List message posted by: "Snow, Daniel A." < Daniel.Snow(at)wancdf.com (Daniel.Snow(at)wancdf.com)>
After trimming and fitting the lower cowl of my 9A to the spinner back
plate and fuselage, I've found that I have insufficient room for the
Vans air filter. The filter is about 2-3/8" high, and the space between
the cowl and carburetor is only 1-3/4". These dimensions don't even
take into consideration the thickness of the FAB or space needed between
the FAB and cowl. The carburetor appears to be Superior's normally
supplied Precision MA-4-5, but the Authorized Release Certificate refers
to the LYC 0-360 under "Eligibility".
Has anyone experienced this problem, or does anyone have any good ideas
to work around this apparent problem? I don't think I want to go with a
shorter filter, as this would reduce the cross sectional area by more
than 50%. I also don't like the idea of removing the engine and sending
it back to Superior for refit of a different carburetor.
[quote][b]
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peter(at)mather.com
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| Posted: Thu Jan 25, 2007 11:48 am Post subject: Superior XP O-320 Engine - Carb Interference With Lower Cowl |
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Daniel
I've just been through this with my IO-320 in an RV9A. As Steve says the default lower cowl for a RV9A is for a carburetted O-320. For anything bigger, like my IO-320 you need a O-360 lower cowl. This is identical except that the scoop is bigger.
In my case I had told Vans I had the injected engine so they had shipped the wrong cowl. The solution was to cut out the O-320 scoop and glass in an O-360 one. The part number for this is FAB-6-SCOOP-360-1 ($160). This gives the clearance for the fuel injector. The remainder of the lower cowl is the same for all models of 320 and 360 across the complete RV6, 7 and 9 range.
The process of removing the 320 scoop and fitting the 360 one was not too difficult. Let me know if you want a blow by blow description
Hope this helps
Best Regards
Peter
[quote] ---
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