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Old 08-24-2023, 01:02 PM
csdominey csdominey is offline
Join Date: Mar 2018
Location: Alvin, Tx
Posts: 54
Default 8A Cowl Inlet to FAB connection

Having trouble visualizing the fiberglass work to be done between the lower cowl inlet connecting into the FAB. Any pics, discussion would be appreciated.
C Dominey
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Old 08-24-2023, 03:46 PM
jdelpeso jdelpeso is offline
Join Date: Mar 2006
Posts: 48

Maybe this can help
Jose del Peso
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Old 08-24-2023, 04:58 PM
Ralph Inkster Ralph Inkster is offline
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 2,182

Plans suggest you put a rubber seal around the cowling inlet and the FAB snorkel housing. You must allow some space between so the engine movement doesn't jam the FAB housing into the fiberglass cowling, maybe 1/2 to 3/4" space.

1st challenge is creating a seal for the in rushing air to not leak in under the engine defeating cooling airflow.

2nd challenge is to make the seal easy so as not hinder lower cowl installation & removal - especially for an 'A' model.

Fiberglass work involves shaping the cowl inlet to a similar shape as the FAB front opening. There are many different ways to attach the seal material to either the FAB or Cowl, or both as I have done on some 'A' models I did (top seal half attached to the FAB, bottom overlapping seal half on the cowl, not perfect but worked for the most part, especially on 'A' models).

The best air inlet/seal I did was with a removable front inlet. I used mould release in the area pictured in the above post, laid up a few layers of fiberglass inside (popped it out after curing)to create a flange, than cut the inlet off the lower cowl (removable, to be held on with 3 screws), the fiberglass inlay was than trimmed to form a flange, glued into the lower cowl, & drilled for nutplates to create the removable cowl inlet flange. Than the inlet rear edge was shaped with fiberglass for mounting the rubber seal to conform with the FAB housing. This mod made lower cowling installation after maintenance MUCH easier, as well creating the best inlet seal I've accomplished ever.
Now retired - my builder assist shop now closed,

Last edited by Ralph Inkster : 08-24-2023 at 05:02 PM.
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Old 08-24-2023, 10:24 PM
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bruceh bruceh is offline
Join Date: Mar 2008
Location: Ramona, CA
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I have a bunch of photos here about the process of creating the cowling to FAB interface.

Modifications to the FAB here:
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Old 08-25-2023, 08:01 AM
csdominey csdominey is offline
Join Date: Mar 2018
Location: Alvin, Tx
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Thanks. Helped a lot. Beautiful work there. Yikes.
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