Tiny Tach reset by Alex Varv

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" colspan=2 height=90 BGCOLOR="#006699" TEXT="#080000" background="043785a3.jpg"> <div> <B>                                              Tiny Tach reset   by  Alex Varv</B></div> <div> </div> </td> </tr><tr> <td valign="top" width=210 BGCOLOR="#FFCC66" TEXT="#080000"> <bR> <bR> <bR> <bR> <div> <B>The Tiny Tach is manufactured by Design Technologies in Westmont Illinois.For further info please contact Mr.Stephen Myers at:</B></div> <div> <B>630-920-1300</B></div> </td> <td valign="top" height=390 BGCOLOR="#333333" TEXT="#F7F7FF"> <bR> <div> <B>Having a tachometer on board is a very useful thing. It will help the pilot not only to easily tune the carburetor but to monitor the engine in flight as well.</B></div> <div> <B>I have received many questions about resetting the Tiny Tach. Please look at the pictures below. The steps are very simple to follow:</B></div> <bR> <bR> <bR> <div> <B><IMG SRC="43d0c890.jpg" border=0 width="524" height="393" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <bR> <div> <B><IMG SRC="43f20980.jpg" border=0 width="544" height="408" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <bR> <bR> <div> <B><IMG SRC="4401f970.jpg" border=0 width="543" height="407" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <bR> <bR> <div> <B><IMG SRC="4411f970.jpg" border=0 width="543" height="407" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <bR> <div> <B>Another useful thing is to set the hours after the tachometer has been reset.</B></div> <div> <B>In order to do this, the white and the red wires need to be connected to a 12 Volt AC power source. It may be a small bell transformer or other type of 12 Volt AC power source.</B></div> <div> <B>The picture below illustrates this:</B></div> <bR> <bR> <div> <B>     <IMG SRC="442d7740.jpg" border=0 width="471" height="628" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <bR> <div> <B>Remember: The power source MUST be 12 Volt AC</B></div> <bR> <bR> <div> <B>                </B><FONT SIZE="2" COLOR="#FFFF00" FACE="Arial" ><B>Tiny Tach Troubleshooting</B></FONT></div> <bR> <div> <B>1) No RPM reading:</B></div> <div> <B>     - faulty spark plug, faulty ignition coil, not enough turns on the red Tach wire</B></div> <bR> <div> <B>2) Too low RPM readings:</B></div> <div> <B>     - not enough turns on the red wire (the average is 3 turns)</B></div> <div> <B>     - faulty spark plug</B></div> <div> <B>     - incorrectly gapped spark plug electrodes (too much gap); </B><FONT SIZE="2" COLOR="#FF0000" FACE="Arial" ><B>this usually      </B></FONT></div> <div> <B>       occurs after the spark plug has been changed; new spark plugs MUST be   </B></div> <div> <B>       gapped to the engine specifications</B></div> <bR> <div> <B>3) Too high RPM readings:</B></div> <div> <B>     - red wire too close to the ignition coil</B></div> <div> <B>     - too many turns of the red wire</B></div> <div> <B>     - incorrect tachometer type</B></div> <bR> <div> <B>4) Unstable RPM indications:</B></div> <bR> <div> <B>    - bad connection (the red wire is broken under the insulation) remove</B></div> <div> <B>      insulation and test  - see picture below: </B></div> <div> <B>      <IMG SRC="4441a940.jpg" border=0 width="538" height="404" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <bR> <bR> <div> <B>There is another way to test if the red wire is broken:</B></div> <bR> <div> <B>Set the Ohmmeter to the M Ohm reading.Measure the resistance between the white and the red wire.  If the wire is shorted no signal will reach the Tiny Tach. The Ohmmeter will indicate about 5-6 M Ohms. </B></div> <div> <B>Shorted wires occur if the wires are routed too close to cylinders, cylinder heads or exhausts. Even with no external damage, I found molten and shorted wires under the insulation.</B></div> <bR> <div> <B>If there is no reading at all, the wire is definitely broken. The insulator should be removed and the wire soldered.</B></div> <bR> <bR> <div> <A HREF="index.html" TARGET="_top" TITLE=" "><U><B>Back to INVENTIONS</B></U></A><B>  </B><FONT SIZE="2" COLOR="#FFFF00" FACE="Arial" ><B>                               </B></FONT></div> <bR> <bR> <bR> <bR> <bR> </td> </tr></table></body>