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I hung (hanged???) my engine from the ceiling with a turnbuckle at each corner then positioned the firewall for the correct thrust line. The turnbuckles allowed me to make small changes to the engine position to fine tune the thrust line. I then placed the exhaust, oil cooler and radiator in appropriate positions and built the motor mount around every thing else. Note that a RV-4 doesn't have much space under the cowl. Pictures are attached for the new guys.
Ken Powell
Bryant, Arkansas
501-847-4721
RV-4
-------------- Original message --------------
> Ernest,
> So where were you with your good ideas a year ago??? ;-) Actually, I
> was able to do something very similar by using 2x4 blocks and resting
> the engine on the factory bed mount. Your approach sounds like a good
> idea for someone that is building a motor mount from scratch. I also
> like the approach of tipping the engine vertical and using a dummy
> firewall.
>
> Thanks for sharing your ideas, even if it is a year late. Maybe someone
> else can benefit from your suggestion.
>
> Mark S.
> >
> >
>
> I found a really easy way to do this using a laser level and a homemade
> stand.
>
> http://ernest.isa-geek.org/Delta/Pictures/EngineStand.jpg
>
> The stand can be thrown together in a few minutes from some 2x4s and
> assorted scrap wood. The top 'box' should fit the sides of the oil pan
> closely. Drill 4 holes around the top so that a 5/16 bolt will drop
> in. Put a nut on the bolt, then a washer and set one in each hole. The
>
> bolts should rest just inside the oilpan flange.
>
> Set the airplane up so that the level shines through the horizontal
> centerline. Now move the stand in front of the airplane, and set the
> engine on it. Adjust the nuts on the bolts to dial in the height,
> upthrust, and make it level.
>
> Now move the level to indicate the vertical centerline. Slide the stand
>
> left or right, or turn it, to center it and get the correct left or
> right thrust. Taps from a small hammer at the very bottom of the legs
> will let you move the stand in very small increments.
>
> The second adjustment will most likely disturb the first, so iterate
> through both adjustments until nothing more needs to be done. Now weld
> the motor mount together in place.
>
>
> --
> ,|"|"|, |
> ----===<{{(oQo)}}>===---- Dyke Delta |
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>
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>
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Ken-Powell-mm-Jan27_01.jpg
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