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Speedy11(at)aol.com
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 Posted: Sat Nov 15, 2008 3:46 pm Post subject: Fitting the lower cowl |
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Gents,
I need some advice regarding fitting the lower engine cowl.
During the fitting, the amount of cowl spinner ring exposed below the spinner is currently 1/2 inch. Van's plans call for 1/8 to 3/16 inch. But the flange on the inboard portion of the air intake is bottomed out. Did you trim the inboard portion of the intake flange on the upper cowl to permit the lower cowl to move upward and create the correct amount of exposed spinner ring below the spinner?
Stan Sutterfield
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carl.froehlich(at)cox.net
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| Posted: Sat Nov 15, 2008 7:35 pm Post subject: Fitting the lower cowl |
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You will need to trim the upper cowl flanges behind the spinner somewhat to get the top and bottom cowl pieces closer. You want the two cowl pieces to form a circle, slightly larger than the spinner (per Van’s guidance 1/8” to 3/16” larger diameter than the 13” spinner). You may need to also trim the outboard forward cowl flanges as well. Do these after you are happy with the spinner fit.
Personal preference is to get closer to 1/8” than the 3/16”. Not sure if this is a clearance problem with angled head IO-360s or not.
Carl Froehlich
RV-8A (450 hrs)
RV-10 (fuselage)
From: owner-rv8-list-server(at)matronics.com [mailto:owner-rv8-list-server(at)matronics.com] On Behalf Of Speedy11(at)aol.com
Sent: Saturday, November 15, 2008 6:45 PM
To: rv8-list(at)matronics.com
Subject: Fitting the lower cowl
Gents,
I need some advice regarding fitting the lower engine cowl.
During the fitting, the amount of cowl spinner ring exposed below the spinner is currently 1/2 inch. Van's plans call for 1/8 to 3/16 inch. But the flange on the inboard portion of the air intake is bottomed out. Did you trim the inboard portion of the intake flange on the upper cowl to permit the lower cowl to move upward and create the correct amount of exposed spinner ring below the spinner?
Stan Sutterfield
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| | - The Matronics RV8-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV8-List |
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althomas454(at)msn.com
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| Posted: Sat Nov 15, 2008 7:46 pm Post subject: Fitting the lower cowl |
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Stan C
The objective of trimming the upper and lower cowl flanges around the spinner is to get a perfect circle on the cowl. I trimmed mine with the upper and
lower cowling off. Using the spinner as the reference I marked the cowling with Sharpie to lay out the correct position. Some folks want to make the circle a bit high on the cowling to allow for engine sag (1/8 to 1/4 inch is common) later on.
I ended up cutting about 3/4 an inch off the upper cowling forward flanges and almost an equal amount off the lower. The final height of the inlet is suppose to be about 2 1/8 inches high if I remember correctly. You don't want the inlet to be to big. After getting the fronts trimmed correctly I then did the horizontal trimming of the lower cowling with it mounted on the firewall. So far it's been pretty straightforward. My last trim will be on the horizontal lines of the upper cowling. There will be some filling required up front but not much. The front top and bottom cowl ended up in a nice straight line behind the spinner plate. Whole process took about 15 hours.
Albert Thomas
N880AT
From: Speedy11(at)aol.com
Date: Sat C 15 Nov 2008 18:45:09 -0500
Subject: Fitting the lower cowl
To: rv8-list(at)matronics.com
Gents C
I need some advice regarding fitting the lower engine cowl.
During the fitting C the amount of cowl spinner ring exposed below the spinner is currently 1/2 inch. Van's plans call for 1/8 to 3/16 inch. But the flange on the inboard portion of the air intake is bottomed out. Did you trim the inboard portion of the intake flange on the upper cowl to permit the lower cowl to move upward and create the correct amount of exposed spinner ring below the spinner?
Stan Sutterfield
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| | - The Matronics RV8-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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Speedy11(at)aol.com
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| Posted: Sun Nov 16, 2008 6:33 am Post subject: Fitting the lower cowl |
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Carl Froehlich and Albert Thomas - Thank you. Your responses were exactly the info I needed. I sincerely appreciate it.
Stan Sutterfield
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| | - The Matronics RV8-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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