spark plug caps

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nednortonrider
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spark plug caps

Post by nednortonrider » Mon Nov 05, 2018 12:19 pm

I am using a "minimag" ignition system on my interpol and have been advised to use 10 ohm resister plug caps. I ordered two but when they came they were 5 ohm . Phoned the bloke up and "nah , mate don't exist "!!!. I've seen them "on-line" but not the long straight ones i need.So , two questions ,

anyone know where i can get a pair ,and secondly What is the advantage ??

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Richard Negus
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Re: spark plug caps

Post by Richard Negus » Mon Nov 05, 2018 8:08 pm

Following the man-who-knows (Julian Kemp), I bought a pair of 10 ohm straight caps from France via Ebay.
Reference is NGK SD10F, still available from France at £4.95 each.
R.
Slower slower, no faster faster - the joys of old fogey mode to hooligan mode at the flick of a switch

johnbirchjar
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Re: spark plug caps

Post by johnbirchjar » Tue Nov 06, 2018 12:34 am

Available in France(and on e-bay) Thats handy to know, I was looking for replacement ones some years back(a bit of an experiment I was conducting on the Classic wink)J.B.

nednortonrider
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Re: spark plug caps

Post by nednortonrider » Tue Nov 06, 2018 11:21 am

Thanks , Ordered a pair from France (£13.35 inc P&P).Still wondering about the advantage of 10 ohm v 5 ohm. Come on you electrical boffins , i hate a mystery .

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Richard Negus
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Re: spark plug caps

Post by Richard Negus » Tue Nov 06, 2018 12:52 pm

With the 10 ohm caps, you can then use copper cored HT lead instead of the usual resistive cable.
R.
Slower slower, no faster faster - the joys of old fogey mode to hooligan mode at the flick of a switch

johnbirchjar
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Re: spark plug caps

Post by johnbirchjar » Tue Nov 06, 2018 11:35 pm

A wise choice,in my experience the copper cable HT leads are vastly superior Very Happy,J.B.

nednortonrider
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Re: spark plug caps

Post by nednortonrider » Thu Nov 15, 2018 2:26 pm

My 10 Ohm plug caps arrived today .Fitted them and what a difference BLOODY AWFUL !!!!.Sod to start then backfired, sounded flat ,exhaust headers glowing red .Re-fitted the 5 Ohm plug caps and all OK !! I'm amazed a plug cap can make such a difference .Ho Hum ,we live and learn .

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