Author Topic: Plug caps  (Read 1078 times)

Offline ShaunMac

  • A's Best Friend
  • ***
  • Join Date: Feb 2013
  • Posts: 128
  • Karma: 1
Plug caps
« on: 08.10. 2013 14:12 »
Hi all,

Just been making some new ht leads up and realised my spark plug end caps are 10 ohm resistance.
Will this be an issue?
Should I get non-resistance ones?

Thanks,
Shaun
61 Super Rocket swing-arm

Online bsa-bill

  • Wise & Enlightened
  • *
  • Join Date: Mar 2006
  • Posts: 5474
  • Karma: 64
Re: Plug caps
« Reply #1 on: 08.10. 2013 14:34 »
Yes, it's the advice always given
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline beezermacc

  • Wise & Enlightened
  • *
  • Join Date: Dec 2011
  • Posts: 1010
  • Karma: 39
  • Not for the purist!
    • Priory Magnetos Ltd.
Re: Plug caps
« Reply #2 on: 10.10. 2013 09:37 »
Actually, 10 ohms is next to nothing and should not affect running at all. Plug caps known as 'suppressor caps' often have upwards of 10,000 ohms resistance; these are the ones to avoid. Your plug caps are probably designed to be zero resistance, 'straight through' types, and there may be some reason to do with their construction, maybe the materials used, why they have a little bit of resistance. As plug caps are only a couple of quid I'd probably get some new ones anyway.
Priory Magnetos Ltd - A10 spares, magneto and dynamo refurbs. www.priorymagnetos.co.uk

Online Triton Thrasher

  • Scotland
  • Wise & Enlightened
  • *
  • Join Date: Feb 2009
  • Posts: 1510
  • Karma: 20
Re: Plug caps
« Reply #3 on: 10.10. 2013 18:15 »
He probably meant 10 kOhm.

Offline ShaunMac

  • A's Best Friend
  • ***
  • Join Date: Feb 2013
  • Posts: 128
  • Karma: 1
Re: Plug caps
« Reply #4 on: 12.10. 2013 15:59 »
Thanks guys. Sorry, yes, did mean 10k ohms.
61 Super Rocket swing-arm

Offline terryk

  • Valued Contributor
  • ****
  • Join Date: Oct 2006
  • Posts: 458
  • Karma: 3
  • Townsville Queensland Australia
Re: Plug caps
« Reply #5 on: 15.10. 2013 13:33 »
Dont use them with magnetos
1950-53 A10 rigid/plungers, 1958-61 A10 super rockets, 1947-50 A7 longstrokes, 1949 Star twin,
1951-54 A7 plungers, 1940s M21, WDM20s,
1948-50s B33s rigid/plunger/swingarm, 1948-50s b31s rigid/plunger/swingarm

Offline a10gf

  • Wise & Enlightened
  • *
  • Join Date: Sep 2006
  • Posts: 2805
  • Karma: 42
  • West Coast, Norway & Alpes Maritimes, France
    • A10 GF
Re: Plug caps
« Reply #6 on: 15.10. 2013 14:14 »
Use the 'straight trough' rubber caps, they fall apart\disintegrate after some time (my experience) but have no RF filter\restrictions and does not weaken the magneto spark. Cheap to buy and keep some spares. Example.

A10 GF '53 My A10 website
"Success only gets you a ticket to a much more difficult task"