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Old 07 October 2013, 10:31   #1
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Yearly plug puzzler

Every year about this time I look at new plugs for my OB a 150hp V6 Mariner 2 stroke. Its the same story the 'Z' NGK plugs are 9.58 but the non 'Z' ones are 4.64
I was always told to put the 'Z 'type in as I would not hear my VHF
Intrested in others views and practice as its costly with a V6
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Old 07 October 2013, 11:05   #2
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Interesting. Well, you could try a set and test it? If they're pants you could just run the old plugs for an extra season and keep the non-Zs as backups? Can you access all the plugs without stripping cowls etc?

See, I'm very mean, and I'd be running a timer on those expensive plugs to get every last spark out of them...

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Old 07 October 2013, 11:14   #3
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Interesting. Well, you could try a set and test it? If they're pants you could just run the old plugs for an extra season and keep the non-Zs as backups? Can you access all the plugs without stripping cowls etc? See, I'm very mean, and I'd be running a timer on those expensive plugs to get every last spark out of them...
.

Good point W. I've just blindly renewed them every year. Probably could get two years plus from them as I don't do a lot of hours. When I fogged the engine last week the plugs were like new when I put them in in May. As you know I had issues this summer and only did 20 hours
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Old 07 October 2013, 14:12   #4
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by all means keep the non z plugs as spares, but you will have problems with buzzing on your radio - ive done it with two different engines, the second engine came with non z plugs and i ended up changing them. as for cost, check out ebay as ive saved a fortune in the last couple of years buying off suppliers who happen to have good prices at the time.
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Old 08 October 2013, 10:00   #5
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The Z is telling you that it is a resisted spark plug, it helps/stops electrical interferance.
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Old 08 October 2013, 11:51   #6
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The Z is telling you that it is a resisted spark plug, it helps/stops electrical interferance.
Appreciate that Al but it's a hell'va price to pay for suppression !!
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Old 08 October 2013, 13:47   #7
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Unless they're giving problems why scrap them ? Surely better to carry a couple of new spares in case of a failure.
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Old 08 October 2013, 16:32   #8
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Quote:
Originally Posted by jambo View Post
Every year about this time I look at new plugs for my OB a 150hp V6 Mariner 2 stroke. Its the same story the 'Z' NGK plugs are 9.58 but the non 'Z' ones are 4.64
I was always told to put the 'Z 'type in as I would not hear my VHF
Intrested in others views and practice as its costly with a V6
It's 30 ish, even at 20 hours the 1.50 extra hourly rate is not worth bothering about is it ?
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Old 08 October 2013, 16:59   #9
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It's 30 ish, even at 20 hours the 1.50 extra hourly rate is not worth bothering about is it ?

Hi I agree that overall taking the cost of ribbing over a season 30 is not much. I was just interested in other views and practice.

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Old 08 October 2013, 17:04   #10
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Hi I agree that overall taking the cost of ribbing over a season 30 is not much. I was just interested in other views and practice.

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Nothing to do with being a Scotsman then Billy
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