---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Fri 10/08/10: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:03 PM - Re: AMPS? (jetboy) 2. 05:35 PM - Re: Re: AMPS? (Richard Girard) 3. 05:53 PM - Re: Re: AMPS? (Noel Loveys) ________________________________ Message 1 _____________________________________ Time: 02:03:56 PM PST US Subject: RotaxEngines-List: Re: AMPS? From: "jetboy" Minimum steady state cranking amps is 75 for the 912S This is described in SB-912-042 R1 We did this test on a troublesome 912UL and got 71 amps. Although the SB does not apply to diagnosis of faulty sprag clutch for the lower compression engine, this indeed was the case and the engine was fixed as a result of this test. You want the cable to take 200 amps without much sag, as someone posted, welding cables are a good option these days, especially short links where flexibility is important. Ralph -------- Ralph - CH701 / 2200a Read this topic online here: http://forums.matronics.com/viewtopic.php?p=315146#315146 ________________________________ Message 2 _____________________________________ Time: 05:35:19 PM PST US Subject: Re: RotaxEngines-List: Re: AMPS? From: Richard Girard Ralph et al, This is from the Rotax installation manual, page 114, 17.3.5) Electric starter: Wire from starter relay to the electric starter - cross section of at least 16 mm squared (6AWG) - output: 0.7 kW / 0.9 kW optional page 115, 17.3.6) Starter relay -switching current: max. 75 A (permanent) max. 300 A (for 1 sec.) Rick Girard On Fri, Oct 8, 2010 at 4:01 PM, jetboy wrote: > > Minimum steady state cranking amps is 75 for the 912S > > This is described in SB-912-042 R1 > > We did this test on a troublesome 912UL and got 71 amps. Although the SB > does not apply to diagnosis of faulty sprag clutch for the lower compression > engine, this indeed was the case and the engine was fixed as a result of > this test. > > You want the cable to take 200 amps without much sag, as someone posted, > welding cables are a good option these days, especially short links where > flexibility is important. > > Ralph > > -------- > Ralph - CH701 / 2200a > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=315146#315146 > > -- Zulu Delta Kolb Mk IIIC 582 Gray head 4.00 C gearbox 3 blade WD Thanks, Homer GBYM It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong. - G.K. Chesterton ________________________________ Message 3 _____________________________________ Time: 05:53:16 PM PST US From: "Noel Loveys" Subject: RE: RotaxEngines-List: Re: AMPS? According to AC43.13-1b p.11-3 the next current charted above, you always go to the next higher draw (above 75A), is 100A the cable to be used is 4ga. for runs up to 30 ft. That is the chart for intermittent flow. 2ga. allows for current up to 150A., same run and for currents over 150A to 200A 1ga. is called for. These calculations are for 20C (68F) higher temps require larger cables. Noel -----Original Message----- From: owner-rotaxengines-list-server@matronics.com [mailto:owner-rotaxengines-list-server@matronics.com] On Behalf Of jetboy Sent: October 8, 2010 6:31 PM Subject: RotaxEngines-List: Re: AMPS? Minimum steady state cranking amps is 75 for the 912S This is described in SB-912-042 R1 We did this test on a troublesome 912UL and got 71 amps. Although the SB does not apply to diagnosis of faulty sprag clutch for the lower compression engine, this indeed was the case and the engine was fixed as a result of this test. You want the cable to take 200 amps without much sag, as someone posted, welding cables are a good option these days, especially short links where flexibility is important. Ralph -------- Ralph - CH701 / 2200a Read this topic online here: http://forums.matronics.com/viewtopic.php?p=315146#315146 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.