Engine Measuring Tool
Quickie 500 & QM40 Pylon Racing
Do you wonder why some of the racers always have engines
that run consistent and you are searching for that special
engine? The setup has much to do with ending that search.
If you do not know what your engine is set at, how do you
know what to do with it to make it work harder for you? Once
you have the setup you want, it will work for most engines.
Then you only have to take conditions into consideration.
Remember, we are all using the same equipment and it is the
setup of the engine and the airplanes that make the difference
in equipment performance.
You must know where you are so that you will know where
will first set up to check the deck height.(the distance between
the top of the piston and the top of the sleeve at TDC) The
first thing you do is remove the head and remove the sleevet.
Then place the sleeve-ring on the sleeve. You can remove the
existing shims or leave them on for your first measurement.
Put the sleeve back in the engine with the sleeve-ring installed.
Next zero the meter by closing the caliper and pressing the
QKE-25 Digital Measuring tool complete kit
Liner with the .200" spacer ring installed
Open the digital caliber about an inch and place the anvil
on the top of the sleeve. Hold the anvil tight on the top
of the sleeve as in the picture. Then turn the engine over
until the piston goes past top dead center. You can now read
the deck height. The picture shows .3955.
Remember we installed the .200 sleeve shim under the sleeve
and have to mentally subtract that amount to determine the
actual deck height. This deck height is .1955.
At this point, you can add or remove sleeve shims to what
ever deck height works for you. With this tool, you can repeat
the engine numbers that work in your conditions from engine
to engine. A thing to note is that you can repeat this step
as many times as you want and the same numbers will repeat
every time. This tool is very accurate.
If the deck height is where you want it, move to the next
step. If not, add or remove sleeve shims to get it where you
want it. When it is there, the repeat this step before measuring
the head clearance.
Now that you have the deck height number,
the head spacing (head spacing is the distance
between the head face and the top of the piston
at TOC) is simple. With the digital caliper
still in the last reading position, (.3955)
press the "zero" button to reset
the caliper to (0.000). Next, hold the anvil
of the caliper on the face of the head and
extend the caliper until it is firmly pressing
on the seating surface of the head. The photo
shows the reading on this head. It is reading
.2155. After we mentally
subtract the .200 for the sleeve ring, our
head spacing is .0155.
Just add or subtract head shims to get the
numbers that work in your racing conditions.
With head shim,
head spacing reads .015
(After our mental math of minus
Stop guessing. Order your DCRC engine measuring tool!
And while your at it order a Torque tool
Along with an DCRC Racing Bearing Tool
on the accessories page click here to view
||DCRC Custom Bearing Tool
||Digital Measuring Tool
||Engine Deck Tool Kit
© Copyright 2007-2008 Darrol Cady All rights reserved.