85 hp motor mount?

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badger bob
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85 hp motor mount?

Post by badger bob » Tue Apr 26, 2011 18:29

will a motor mount for a 85hp chief fit on a champ? what motors will bolt on this mount? 85hp 90hp 0200 or a j79? iam thinking about upgrading my champ to some thing thats got some git up and go. thanks Bob

MikeB
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Re: 85 hp motor mount?

Post by MikeB » Tue Apr 26, 2011 19:56

Bob,
To my knowledge there are two mounts for Champ, Chief type aircraft. The standard short mount and the longer (about 1" if I remember correctly) mount used on 85 horse with the 'long starter and 90 horse CCM models. You can go with the Buzz Wagner STC SA3-372 which allows the installation of a 0200 (100 horse) engine. Buzz passed away a few years ago but I understand it's still available. Be aware this is not an easy installation (don't ask me now I know :evil: ). The instructions are pretty vague and convoluted.

You can build your own motor mount with this STC for whatever it's worth. I used the installation with the short mount and a Sky-Tec starter system but it's a tight fit and I'm pretty sure it would be necessary to move the engine ahead to remove starter or magnetos. Not a big item, though. It does require an additional fuel tank to meet FAA minimums. If you can find a 85 horse engine I'm sure it's an easier installation. Especially without a starting system. Most, also recommend additional fuel capacity for the 85 horse also as it barely meets the minimum standard.

The other option is the Don Sword STC to build up a "Super 85". I'm not that familiar with the Sword STC but I know others on this site have it and are very satisfiied with the result. They'll probably chime in. A bit on pricey side but so is completely overhauling either a 85 or 0200 :mrgreen: .

Hope this helps!

MikeB

badger bob
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Re: 85 hp motor mount?

Post by badger bob » Wed Apr 27, 2011 07:38

Mike thanks for the info. ill hvet to check the mount and see if it long or short. iam just in the checking things out mode at this time. thanks Bob

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Nathan K. Hammond
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Re: 85 hp motor mount?

Post by Nathan K. Hammond » Wed Apr 27, 2011 13:35

It should fit with no problem; check out drawing 4-585, it list the 11AC and the 7B, C, D series. As for what motor will work; A65, C85, C90 all bolt right on. You have to use adapters on the O200 because of the conical vs. lord mount. The J79 takes an adapter plate, but a J58 will slide right in. :wink:

Like Mike said; The long mount was a creation of Buzz Wagner and part of his O-200 STC (you had to build the mount.) This was before the day of the light weight starters and generators. You had 2 options on the STC; create dishpans on the firewall and the fuel tank to clear the starter/generator; or build a long mount.

(If you dishpan the fuel tank, it lowers the capacity to 12.58 gallons and that's not enough per the FAA for 85+hp, which forces you to add a wing tank.)

Nowadays, you can go with a Skytec starter and B&C alternator, keep the short mount, and not have to add a wing tank.

nkh
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MikeB
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Re: 85 hp motor mount?

Post by MikeB » Wed Apr 27, 2011 15:32

Image

Bob,
Here's a shot of my 0200 installation. As you can see it's a pretty tight fit with the short mount. As I mentioned before it's probably necessary to move the engine ahead if it's necessary to service either the starter or magnetos but easy done by unhooking the wiring and plumbing and unbolting the engine mount from the firewall.

My firewall had a 'dishpan' in it at one time but I covered it because it wasn't needed with the short starter and it was made of aluminum rather than steel which I thought was less than safe with the gas tank right behind it :shock: . Using the short mount allows you to keep the original upper and lower cowling. If you go with a long mount (unless you already have it) it's necessary to make new upper and lower cowlings. I think the 7EC among others used the longer mount. I know Wag Aero lists both sizes.

I opted not to go with a charging system and will recharge the battery (25 amp/hour) on a periodic basis.

MikeB

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Nathan K. Hammond
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Re: 85 hp motor mount?

Post by Nathan K. Hammond » Wed Apr 27, 2011 15:50

MikeB wrote: I think the 7EC among others used the longer mount. I know Wag Aero lists both sizes.
I learnt something new every day.

nkh
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badger bob
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Re: 85 hp motor mount?

Post by badger bob » Wed Apr 27, 2011 17:35

I would like to go with a 0200 ( i had one in a cessna 150 and it ran like a top for 20yrs) but iam playing the light sport thing now so i cant pile on much wight. iam running a flottorp 74x50 wood prop and i think that a mccauley 72 44 mite be what i realy need. but i may have to keep the 65 and jack it up to 75 and be happy. thanks Bob
Last edited by badger bob on Thu Apr 28, 2011 07:40, edited 1 time in total.

MikeB
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Re: 85 hp motor mount?

Post by MikeB » Wed Apr 27, 2011 17:55

All three of the Champs on our airport have the CM 74 43 metal props. I would think they'd be more effecient than a wood prop, although a wood prop is smoother.

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Re: 85 hp motor mount?

Post by CptKelly » Wed Apr 27, 2011 17:59

Gail's DC Champ has a good bit more distance between the firewall and B&C starter/Slick mags. Could be that the 0200 case moves the engine forward a bit? How can one tell if the mount is "long" or "short"?

Mike

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Nathan K. Hammond
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Re: 85 hp motor mount?

Post by Nathan K. Hammond » Wed Apr 27, 2011 21:24

8-21/32" from Firewall to the rear side of the engine lug on the 7AC/BC/CC/DC (short) mount. Drawing 4-585.

Most likely you've got a set of adapters so the O-200 Lord mount can match up with the Conical engine mount.

Image

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