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Easy-X |
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Easy-X Super Spammer
Joined: 08 Mar 2019 Karma :
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Posted: 13:57 - 13 May 2022 Post subject: HT Leads - understanding the terminology |
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"Some red HT leads would look nice!" Let's just make some...
So this is for the ol' Triumph we're working on. Points have at some point (not by us) been replaced with a Dynatek* electronic ignition system and we've replaced the rectifier/zener arrangement with a conventional reg/rec unit.
First up copper vs. carbon leads. Copper is more "noisy" but as this isn't an EFI bike with loads of sensors does it matter? Also do screw-in type plug caps only work with copper?
Resistors. I get that carbon leads are themselves a resistance in the circuit so the equivalent for copper would be resistor plug caps or spark plugs with a resistor built-in. Erm... n00b question why/when does one need resistance?
Specifically does our old Triumph need resistance somewhere bearing in mind the retro fitted electronic ignition?
Finally actually making leads. I could see copper being a bit easier to work with and carbon leads definitely requiring a specific crimp tool. Just wondering whether the EMF noise from copper is even worth worrying about
*I'm wondering if the kit was ever intended for a Triumph, I can only turn up mentions of it sold for BMWs of the same era. ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Easy-X |
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Easy-X Super Spammer
Joined: 08 Mar 2019 Karma :
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Posted: 14:59 - 13 May 2022 Post subject: |
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Yes, cloth braided cable does seem appropriate Do I need plug caps with the 5k resistor? ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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gt alex |
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gt alex Two Stroke Sniffer
Joined: 01 May 2022 Karma :
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Posted: 15:08 - 13 May 2022 Post subject: Re: HT Leads - understanding the terminology |
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Easy-X wrote: | "Some red HT leads would look nice!" Let's just make some...
First up copper vs. carbon leads. Copper is more "noisy" but as this isn't an EFI bike with loads of sensors does it matter? Also do screw-in type plug caps only work with copper?
Resistors. I get that carbon leads are themselves a resistance in the circuit so the equivalent for copper would be resistor plug caps or spark plugs with a resistor built-in. Erm... n00b question why/when does one need resistance?
.[/size] |
I don't really know but I suspect these days every thing is resistive to reduce radio interference and "noise" in the bikes harness which maybe could upset something electronic on the bike.
I have a carburettor and cdi black box and have unscrewed the plug caps and removed the resistors replacing them with a short length of silver solder rod. I am also running copper HT lead which came from the local dirt bike shop (only place I could find it) and I an running non resistor plugs.
Its a 2002 bike and I have been running that way for 6months no ill effects and I believe I have added reliability.
We will see but I don't think it's a issue. |
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Bhud |
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Bhud World Chat Champion
Joined: 11 Oct 2018 Karma :
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Nobby the Bastard |
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Nobby the Bastard Harley Gaydar
Joined: 16 Aug 2013 Karma :
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virus |
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virus World Chat Champion
Joined: 17 Aug 2006 Karma :
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Posted: 20:07 - 13 May 2022 Post subject: |
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as Nobby says, the resistors are noise suppression to prevent interference with electrical items such as TVs, AM/FM radios, CB / Ham radio, WiFi etc
So basically throw the resistors away and dont worry. so long as the Low tension side of the coil has the right resistance for the CDI then it will be totally fine. Putting 2.2 Ohm coils on a bike expecting 3 Ohm will result in it running like a bag of shit until the CDI just dies for example.
Cheers
John ____________________ own: 81 xs1100g...
owned: 85 rat CG (sold), 91 GS500e (stolen), 84 gsx400f (scrapped), 81 z250 (siezed, siezed, scrapped), 83 cb250rs (sold), 84 gpz750r ratfighter (killed) 84gpz400 (sold), '80 cb650 ratfighter (wrote off) 95gsx6/12f ratfighter (killed) 91 xj900 (sold)
stinkwheel Well I just had my hands up a pigs fanny. Which makes your concerns pale into insignificance. |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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MCN |
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MCN Super Spammer
Joined: 22 Jul 2015 Karma :
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Posted: 11:13 - 14 May 2022 Post subject: |
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Leakage to Ground/Earth.
Noise (if you're bothered.)
Watertightness encourages reductiin in potential for 'tracking' (leakage to earth) which leaks out all the energy used to jump the airgap under pressured conditions.
I prefer copper as when ever ive had issue with HT systems most commonly it was bastirt crabon leads and their shitey connection.
If you're real anal, one of those petrolhead sites that those weirdos who are 'intae cars' use.
There is a lot of tecspeek on somenof those sites.
Not much problem with ignition on modern electronic ignition systems really. The materials are better quality and the components dont suk as much as before. (Since spark ignition was invented, it seems like as long as it worked no fuker bothered to advance it or develop it much.) ____________________ Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN. |
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Easy-X |
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Easy-X Super Spammer
Joined: 08 Mar 2019 Karma :
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Posted: 19:53 - 14 May 2022 Post subject: |
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Update: complete brain fart The Dyna module is on the Kawasaki, the T140 actually has an original Lucas "ignition amplifier" ____________________ Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter |
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steve the grease |
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steve the grease Crazy Courier
Joined: 26 Jan 2018 Karma :
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gt alex |
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gt alex Two Stroke Sniffer
Joined: 01 May 2022 Karma :
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gt alex |
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gt alex Two Stroke Sniffer
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B1N |
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B1N Scooby Slapper
Joined: 13 Feb 2022 Karma :
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Posted: 11:00 - 15 May 2022 Post subject: |
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If you look at the 'Pictorial diagram of a simple spark-gap transmitter from a 1917 boy's hobby book' inthe link below you can see how similar a spark gap transmitter is to a points ignition system, basically it is a spark gap transmitter.
https://en.wikipedia.org/wiki/Spark-gap_transmitter
The points act as The telegraph key, any wires of the bike loom connected to or near the ignition circuit will act as the tuning coil, the leyden jar is a condenser, the coil and the spark gap you already know. |
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MCN |
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MCN Super Spammer
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steve the grease |
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steve the grease Crazy Courier
Joined: 26 Jan 2018 Karma :
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Posted: 18:50 - 15 May 2022 Post subject: |
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Construction and use stuff is points on your license.....
https://www.legislation.gov.uk/uksi/2002/2126/made/data.xht?view=snippet&wrap=true ____________________ All the above is my personal opinion, you can see my lips move, but I'm talking out of my arse.
I've been riding, and fixing , bikes for 50 years, in that time the more I learn, the less I am absolutely sure of..... |
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stinkwheel |
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stinkwheel Bovine Proctologist
Joined: 12 Jul 2004 Karma :
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Posted: 19:06 - 15 May 2022 Post subject: |
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Although it's going on a Triumph Bonneville. Presumably a Hinkley one if it has a Lucas ignition so radio noise supression isn't much of a concern. C&U isn't retrospective with the exception of seatbelts. ____________________ “Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles. |
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Old Git Racing |
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Old Git Racing World Chat Champion
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Easy-X |
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Easy-X Super Spammer
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B1N |
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B1N Scooby Slapper
Joined: 13 Feb 2022 Karma :
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Posted: 23:34 - 16 May 2022 Post subject: |
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I overthink, therefore I am. |
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Old Thread Alert!
The last post was made 1 year, 347 days ago. Instead of replying here, would creating a new thread be more useful? |
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