Engine Mounts - Different Kinds?

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BES
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Engine Mounts - Different Kinds?

Post by BES » Mon Sep 16, 2013 10:57

Considering an engine upgrade for the Champ I have come across an ad on Barnstormers for an engine mount. The ad says the mount is for an A65/75 or C85 but not for C90 or O-200.
Can anyone enlighten me as to what the difference might be between a mount for an A65 and an O-200?

Best,
Bent,
Denmark

MikeB
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Re: Engine Mounts - Different Kinds?

Post by MikeB » Mon Sep 16, 2013 11:16

I suspect the only difference might be the length of the mount. I don't have the numbers in front of me but it seems the mount for the C90 and 0200 is about one inch or so longer. I think the same for the -12 engines with starters. Having said that I have the short mount on my 7BCM (L16A) with the Wagner 0200 STC. The tubing thickness is the same (.035) on both factory mounts. The down side is that there is not a lot of room between the back of the engine and the firewall so it might be necessary to loosen the mounts to remove the starter or magnetos. I have the Sky-Tec starter (short) on mine rather than the original which would require a 'dishpan' into the firewall for clearance.

Hope this helps!

Mike

BES
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Re: Engine Mounts - Different Kinds?

Post by BES » Mon Sep 16, 2013 12:14

Thanks Mike,

Since I don't need a starter I assume that I shall be able to use the same mount.

Dennis
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Re: Engine Mounts - Different Kinds?

Post by Dennis » Mon Sep 16, 2013 14:44

he may be referring to the mounting bolt size. The 65 mounts is for a 7/16 bolt whereas the 0200 with lord mounts uses a 3/8 bolts.

Dennis

BES
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Re: Engine Mounts - Different Kinds?

Post by BES » Mon Sep 16, 2013 16:16

Ah! That makes sense, then. :shock:
Thanks!

jepropst
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Re: Engine Mounts - Different Kinds?

Post by jepropst » Tue Sep 17, 2013 05:59

The C-90 motor mount (PN 4-884) is approximately 2" longer than the C65 mount (PN 4-585). As mentioned above the 4-884 mount was used on the 7EC aircraft to provide additional engine to firewall clearance for the mags, starter, and generator. Use of the 4-884 motor mount positions the engine 2" farther forward, which also requires a different engine cowling. I used the 4-884 mount on my plane. I have not been able to find a copy of the longer 7EC engine cowling drawings. I replaced my cowling using the old cowling as a pattern. You can find a copy of my field approval for using this mount at: http://johnpropst.yolasite.com/
John Propst
313 Hickory Grove Ln
Elizabeth, WV 26143
cell 304 588 3690
j.e.propst@ieee.org
N3129E 2WV3

clipperfixer
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Re: Engine Mounts - Different Kinds?

Post by clipperfixer » Tue Sep 17, 2013 07:06

John,
In all my googling and yahooing on Aeronca aircraft I have never run across your website. It has a LOT of useful information. I thank you for putting it together. It is very well done and easy to navigate.

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