10
Next, measure 2 ¾ inch from the bottom of the motor box and draw a horizontal line to establish the
thrust line. Double-check all your measurements.
BME 50 users only.
Using the offset centerline and thrust line as a guide, use a pencil and mark your
drill locations for you engine beam mount holes.
BME 50 users only.
Once satisfied with your measurements, center punch you’re mounting locations
and drill using the appropriate sized bit.
BME 50 users only.
Test fit the motor to the firewall
.
If satisfied, install your four blind nuts (not
included) required for your beam mounts. Apply some white wood glue to the inner side of the four
blind nuts and install the blind nuts to the inside of the firewall.
Tip#2 The instructions cover the use of a stock BME mount and muffler. We prefer to use built up ½ inch
standoffs for the BME to give enough room for an optional Pitts style muffler and more forward CG.
DA-50 users only.
If using the DA template provided on the last page
of this manual, check the measurements on the template and ensure the
holes are correct. Cut the paper template to the size needed to tape it to
the firewall using your thrust line and offset centerline as a guide.
DA-50 users only.
Using a center punch, place it in each crosshair and
mark each location. Drill out the four holes for ¼-20 bolts. Test mount
the motor to the firewall to ensure your holes are correct.
Tip#3 The instructions cover the use of 2 ½ or 3 inch stock DA stand offs.
You can use 3” standoffs for the DA-50 if using a Pitts style muffler or more
forward CG.
Now we’re ready to pin the firewall using the 1/8th inch doweling
provided. Mark your firewall location down the outside of the motor
box and around the bottom. Using the locations you marked on the
outside of the motor box, drill three evenly spaced 1/8
th
inch holes ½
inch deep on each side and four on the bottom.
Epoxy the 1/8th inch dowels into the holes and lightly tap them in if
needed. This completes firewall and motor installation.
