Thanks Colin. That explanation says it all and makes it very clear. Mark Jones (N886MJ) Wales, WI Visit my web site: www.flykr2s.com E-mail: flyk...@wi.rr.com ----- Original Message ----- From: "Colin Rainey" <brokerpi...@bellsouth.net> To: "KRnet" <kr...@mylist.net> Sent: Wednesday, October 11, 2006 12:27 AM Subject: RE: KR> Tach hook up question.
> Because the normal ignition system works by applying ground to the coil to > allow it to saturate with current and then remove the ground to collapse > the > field and release the voltage through a multiplying coil, causing a sharp > rise in voltage and reduction in amps to produce the necessary spark > voltage > needed at the plug. Since the ground is connected to either the > points/condenser or electronic ignition you will either damage the module > or > cause an errant spark. Simply depriving the coil of power eliminates any > of > these worries and takes that entire side of the system out of the loop. > The > tach reads off the ground side causing a reaction to the multiple grounds > buffered to raise the needle in response to the total grounding offered, > which the face changes to rpm (through a knowledgeable calibration). > > By using a diode you prevent power or ground from traveling one way, > towards > the coil on the other side, while allowing the ground to travel to the > coil > to provide for the necessary signal to read rpm. Radio Shack carries some > fast acting diodes that will prevent the "cross talking" of the two coils > and can be soldered in line very easily. Make a Y line to each coil, and > after the y closest to the coils, solder in the diode paying attention to > the provided diagram on the package for direction of current flow allowed. > ALL DONE! Now the tach will read on both coils. The selector switch > already > in the system will choose the coil and the tach will read correctly. > > Colin Rainey > Independent Loan Officer > Branch 2375 > Apex Mortgage Company > 386.615.3388 Home Office > 407.739.0834 Cell > 407.557.3260 Fax > brokerpi...@bellsouth.net <mailto:brokerpi...@bellsouth.net> > > > > -----Original Message----- > From: krnet-bounces+brokerpilot=bellsouth....@mylist.net > [mailto:krnet-bounces+brokerpilot=bellsouth....@mylist.net]On Behalf Of > oldbiker...@aol.com > Sent: Tuesday, October 10, 2006 4:37 PM > To: kr...@mylist.net > Subject: Re: KR> Tach hook up question. > > > why can't you cut the power to the coil? Same effect and grounding the > coil. > Ray Lee > kr2 9763 > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html > > > > _______________________________________ > Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp > to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net > please see other KRnet info at http://www.krnet.org/info.html
