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  #1  
Old 09-12-2017, 03:20 PM
Larry DeCamp's Avatar
Larry DeCamp Larry DeCamp is offline
 
Join Date: Apr 2010
Location: Clinton, Indiana
Posts: 489
Default SDS CPI current demand ?

Sorry to bother Ross, but I have searched threads all afternoon without clear results to predict load to size my alternator. I recall comments like 1.1 A @ 2,500 RPM ( per CPI unit ?) and cant find the info in proposed wiring diagrams. So hopefully others can benefit from your comment. How much amperage should be budgeted for ONE CPI firing FOUR plugs at 2700 RPM ? Thanks in advance, Larry
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RV-3B N243RV flying
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  #2  
Old 09-12-2017, 03:26 PM
Toobuilder's Avatar
Toobuilder Toobuilder is offline
 
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Location: Mojave
Posts: 3,608
Default

I measured 1.6 amps for a single system (in flight) on my 540 at 2700. Based on that, Id think you wouldn't need to budget more than 2 amps (and that would be fat).
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  #3  
Old 09-12-2017, 03:48 PM
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rv6ejguy rv6ejguy is offline
 
Join Date: Mar 2005
Location: Calgary, Canada
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Looking at about 1.2 amps on a four.
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Ross Farnham, Calgary, Alberta
Turbo Subaru EJ22, Marcotte M-300, IVO, RV6A C-GVZX flying from CYBW- 415.8 hrs. on the Hobbs,
RV10 95% built- Sold 2016
http://www.sdsefi.com/aircraft.html
http://sdsefi.com/cpi.htm


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