WHAT RESISTANCE COILS FOR TWIN-PLUGGED LE MANS |
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simonnorthroad
Senior Member Joined: 16 May 2017 Location: Bath, UK Status: Offline Points: 156 |
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Posted: 25 Jun 2019 at 15:58 |
One of the two elderly Andrews coils has finally packed up on my twin-plugged Guzzi cafe racer.
It doesnt say what resistance it is, and its so ancient, no matching ones are available - and none at all in the UK, so Im looking at Dyna coils instead which seem to come in a variety of resistances: 2.2 and 3.0 ohm Any advice on lower or higher please? I vaguelly remember something about 3.0 ohm being suitable once but Id not swear to it
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Can you not measure the resistance of the remaining coil?
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Brian.
Better 5 minutes late in this world than years early in the next. |
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simonnorthroad
Senior Member Joined: 16 May 2017 Location: Bath, UK Status: Offline Points: 156 |
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its elsewhere Brian
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Maybe this might help - or hinder. Edited by Brian UK - 25 Jun 2019 at 16:30 |
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Chris950s
Senior Member Joined: 03 Nov 2018 Location: Essex Status: Offline Points: 378 |
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I use a pair of twin lead Dyna Coils, 3.0 Ohms 2/94
Edited by Chris950s - 25 Jun 2019 at 17:28 |
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Chris and Karen - Essex
2011 Stelvio NTX, 1974 950S (750S replica nearly rebuilt!), 1966 Triumph T100SS 58 years young this year! |
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simonnorthroad
Senior Member Joined: 16 May 2017 Location: Bath, UK Status: Offline Points: 156 |
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I think it depends what ignition you are running whether the resistance will be right or not - mine is an aftermarket Newtronic on an 850 (now 950) twin-plugged Guzzi Le Mans round-barrel motor.
BMW aftermarket 8 ohm coils wont work Ive been told Gutsibits do actually list 5 ohm coils for Guzzis but with a LOOOONG wait for delivery, espec. as the bike is on someone else's workbench at the moment
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simonnorthroad
Senior Member Joined: 16 May 2017 Location: Bath, UK Status: Offline Points: 156 |
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Interesting Brian - the Zodiac instructions seem to suggest 3 ohm is the fella (But Gutsibits sell 5 ohm ones!)
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Chris950s
Senior Member Joined: 03 Nov 2018 Location: Essex Status: Offline Points: 378 |
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Same as me, mine is an older Piranha system but the same thing, on an 850 (now 950) twin-plugged Guzzi round-barrel motor with heads re-worked to take Le Mans valves, 36mm carbs.
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Chris and Karen - Essex
2011 Stelvio NTX, 1974 950S (750S replica nearly rebuilt!), 1966 Triumph T100SS 58 years young this year! |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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I would have thought Newtronic would be able to tell you what coil resistance they require. With electonic boxes, transistors carry the current. A 5 ohm coil will take almost half the current taken by a 3 ohm. A 1.5 ohm coil will take twice as much current as the 3 ohm, and clearly the more current flowing the harder the transistors have to work. With points it isn't critical in that respect.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Ken-Guzzibear
Moderator Group Joined: 13 May 2014 Location: Sileby Leics Status: Offline Points: 9454 |
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look on Feked website they have 3 and 5 ohm coils
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The Older i Get, The Better I Was
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simonnorthroad
Senior Member Joined: 16 May 2017 Location: Bath, UK Status: Offline Points: 156 |
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Moto Corsa are a named stockist of Dynatek coils so theyd probably be able to advise! Will call them.
Interestingly, not had a reply to email enquiries to Dyna or Dynatek |
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simonnorthroad
Senior Member Joined: 16 May 2017 Location: Bath, UK Status: Offline Points: 156 |
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Brilliant Brian - thank you - have had a look at the Newtronic website (now Australian owned) and it says "not less than 3 ohm" so using the info youve also supplied, 5 ohm would seem to be better thn 3 ohm!
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