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Tach wiring uls

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frank goodnight

Joined: 27 Dec 2011
Posts: 126

Posted: Thu Jul 31, 2014 2:30 pm Post subject: Tach wiring uls

Hi all,

Just bought a mk3 classic with a 912 uls. The tach reading on the GR EIS reads about

1/2 the actual RPM , previous owner said it had just started. 

It is wired through a kuntzelman hot box. All the info I can find says the pickup

Comes off a trigger coil that terminates at a two pin connecter. I can't find that 

Coil, or the 2 pin connector. I've looked in the rotax manuals, ( line maint, operating instructions

and the heavy maint ). As the problem , I'm told , is likely a dirty connection , I would 

like to run that circuit down and clean up the connections. If anyone could show me how

to find that coil and connection . Or just advise me on how to proceed I would sure

thank you.

Frank Goodnight

Fayetteville , Arkansas

MK 111 Clasic

Sent from my iPad

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byoungplumbing(at)gmail.c
Guest

Posted: Thu Jul 31, 2014 3:09 pm Post subject: Tach wiring uls

my advanced eis - w for the rotax 912 engine says



Tachometer wiring

the best method of sensing engine RPM on the 912 engine is accomplished 

using the tachometer trigger coil included in this engine.    this trigger 

coil has two wires coming from the engine, and they end in a 2 pin socket. 

One of these wires should be connected to ground ( the - terminal of the 

battery)  and the other lead to the tach input of the EIS.  since this 

signal provides 1 pulse per revolution of the engine, the EMP setting on the 

configuration set pages must be set to a value of 1.     A 10 K Ohm resistor 

( brown black orange gold stripes    -- included in the parts pack)  can be 

installed between the eis tach input and the engine's tachometer output to 

provide filtering,    This is only necessary if your tachometer readings are 

erratic,   Normally this resistor is not required.

my eis has 2, 9 pin connectors   my tach sensor wire goes in on pin 9  of 

the connector which the power, master warning light, oil temp sensor, 

coolant temp wires go into...   the other 9 pin connector has the exhaust 

and cylinder head temps (thermocouples)   and oil pressure senders 

connected.



I don’t know anything about the hot box,,, it may be a junction box  wire 

in,,,, wire out,,,, connection box...  I am not sure if there is any other 

electrical magic going on inside the box.



I don’t know if by any reason the emp setting on the eis configuration pages 

had been changed,,,,     or if something in the engine coil has changed. 

good luck



do not archive



boyd young



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frank goodnight

Joined: 27 Dec 2011
Posts: 126

Posted: Thu Jul 31, 2014 3:19 pm Post subject: Tach wiring uls

Thanks Boyd,

I'll keep trying to find --- identify--- the trigger coil so far it has eluded me.

Frank

Sent from my iPad



On Jul 31, 2014, at 6:08 PM, "b young" <byoungplumbing(at)gmail.com> wrote:



[quote] 

 

 my advanced eis - w for the rotax 912 engine says

 

 Tachometer wiring

 the best method of sensing engine RPM on the 912 engine is accomplished using the tachometer trigger coil included in this engine.    this trigger coil has two wires coming from the engine, and they end in a 2 pin socket. One of these wires should be connected to ground ( the - terminal of the battery)  and the other lead to the tach input of the EIS.  since this signal provides 1 pulse per revolution of the engine, the EMP setting on the configuration set pages must be set to a value of 1.     A 10 K Ohm resistor ( brown black orange gold stripes    -- included in the parts pack)  can be installed between the eis tach input and the engine's tachometer output to provide filtering,    This is only necessary if your tachometer readings are erratic,   Normally this resistor is not required.

 

 

 my eis has 2, 9 pin connectors   my tach sensor wire goes in on pin 9  of the connector which the power, master warning light, oil temp sensor, coolant temp wires go into...   the other 9 pin connector has the exhaust and cylinder head temps (thermocouples)   and oil pressure senders connected.

 

 I don’t know anything about the hot box,,, it may be a junction box  wire in,,,, wire out,,,, connection box...  I am not sure if there is any other electrical magic going on inside the box.

 

 I don’t know if by any reason the emp setting on the eis configuration pages had been changed,,,,     or if something in the engine coil has changed. good luck

 

 do not archive

 

 boyd young

 

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