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Rotax 582 Start Current

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Guy Buchanan

Joined: 16 Jul 2006
Posts: 1204
Location: Ramona, CA

Posted: Thu Feb 08, 2007 11:04 am Post subject: Rotax 582 Start Current

The short question is: What is the approximate start current for a Rotax 582?



Why do I ask? Because today I fried the shunt on my 30A ammeter. This 

shunt operates in line between the battery and starter.



I've noticed lately that starting has been slower and I attributed it 

to lower battery capacity. Today I checked the voltage at 13.1V, then 

tried starting. I got three very slow turn-overs followed by a click, 

then nothing. It turns out the click was the shunt separating. I've 

got probably 100 starts on this system over the last year. I did a 

resistance check of the starter across the "big" wires and got only 

0.3 ohms. Is it possible the starter is shorted? How can I tell if 

the starter is bad? Do I dare simply attach the battery to the 

starter directly to see if it works? I could also simply by-pass the 

shunt to see if it works, then I could use the start switch. I'm 

concerned, however, that if the starter is shorted I could blow the 

battery. Is that a possibility?



Thanks,

Guy Buchanan

K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.

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_________________
Guy Buchanan
Deceased K-IV 1200
A glider pilot too.

Bill Denton

Joined: 10 Jan 2006
Posts: 97
Location: Chicago, IL USA

Posted: Thu Feb 08, 2007 11:29 am Post subject: Rotax 582 Start Current

 	  Quote: 	
		  From what I have read, you shouldn't run starter current through the shunt.


	


If you want to measure current going into and out of the battery, the shunt

should be installed between the battery and the alternator.



--

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N6030X(at)DaveMorris.com
Guest

Posted: Thu Feb 08, 2007 11:34 am Post subject: Rotax 582 Start Current

1. The shunt shouldn't be between the battery and starter.  That will 

fry the shunt for sure.  You're talking hundreds of amps on the 

starter.  I'm surprised the shunt lasted this long.  Did your ammeter 

always get pegged when you cranked the starter?  The shunt should be 

either between the battery and the bus if you want to monitor your 

loads in an alternator-out situation, or the alternator and bus if 

you want to monitor the loads during normal operation.

2. The 0.3 ohms in the starter is probably correct or even high, 

because the starter draws a LOT of current.  Amps = Voltage / Resistance.



Dave Morris

At 01:04 PM 2/8/2007, you wrote:

 	  Quote: 	
		  



The short question is: What is the approximate start current for a Rotax 582?



Why do I ask? Because today I fried the shunt on my 30A ammeter. 

This shunt operates in line between the battery and starter.



I've noticed lately that starting has been slower and I attributed 

it to lower battery capacity. Today I checked the voltage at 13.1V, 

then tried starting. I got three very slow turn-overs followed by a 

click, then nothing. It turns out the click was the shunt 

separating. I've got probably 100 starts on this system over the 

last year. I did a resistance check of the starter across the "big" 

wires and got only 0.3 ohms. Is it possible the starter is shorted? 

How can I tell if the starter is bad? Do I dare simply attach the 

battery to the starter directly to see if it works? I could also 

simply by-pass the shunt to see if it works, then I could use the 

start switch. I'm concerned, however, that if the starter is shorted 

I could blow the battery. Is that a possibility?



Thanks,

Guy Buchanan

K-IV 1200 / 582-C / Warp / 100% done, thanks mostly to Bob Ducar.

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Gilles.Thesee(at)ac-greno
Guest

Posted: Thu Feb 08, 2007 1:19 pm Post subject: Rotax 582 Start Current

Dave N6030X a écrit :

 	  Quote: 	
		   2. The 0.3 ohms in the starter is probably correct or even high, 

 because the starter draws a LOT of current.  Amps = Voltage / Resistance.




	


FWIW, a buddy measured a 110 amp starting current, with a peak at 130 

amps on his Rotax 912S.



Best regards,

Gilles

http://contrails.free.fr

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