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Author Topic: Honda Jazz (etc) Sparkplugs  (Read 1271 times)

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Jimbob

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Honda Jazz (etc) Sparkplugs
« on: 24 October 2011, 18:36:57 »
Was surprised to see an invoice for 8 spark plugs on my dads Jazz....

Quick check and yes, 2 plugs per cylinder 'to aid combustion, increase performance and reduce emissions'

Im skeptical, how does 2 plugs help?
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Kevin Wood

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Re: Honda Jazz (etc) Sparkplugs
« Reply #1 on: 24 October 2011, 18:46:49 »
It allows 2 flame fronts to be ignited inside the cylinder instead of just one, so the combustion is quicker and less ignition advance and, potentially, lower octane fuel can be used for a given performance.

.. And they can specify a silly service interval knowing that one of the plugs is bound to still be working... ::)
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aaronjb

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Re: Honda Jazz (etc) Sparkplugs
« Reply #2 on: 24 October 2011, 18:48:31 »
Not a new thing, either (and I don't know if Alfa were the first even): http://en.wikipedia.org/wiki/Alfa_Romeo_Twin_Spark_engine
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Kevin Wood

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Re: Honda Jazz (etc) Sparkplugs
« Reply #3 on: 24 October 2011, 18:52:05 »
Pretty much every aero engine has it. (but more for redundancy than performance).  ;)
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Kevin Wood

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Re: Honda Jazz (etc) Sparkplugs
« Reply #4 on: 24 October 2011, 18:54:49 »
.. and if you switch off one of the mags on an aero engine (revert to a single spark), the RPM drops, so it is clearly slightly more efficient on twin sparks.
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Jimbob

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Re: Honda Jazz (etc) Sparkplugs
« Reply #5 on: 24 October 2011, 19:05:07 »
fair enough then, cheers :y
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aaronjb

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Re: Honda Jazz (etc) Sparkplugs
« Reply #6 on: 24 October 2011, 19:07:21 »
Quote from: Kevin Wood on 24 October 2011, 18:52:05
Pretty much every aero engine has it. (but more for redundancy than performance).  ;)

Good point :)

I knew it had been around a long time - I saw a 1942 Jensen H type recently which had twin sparks on it's Inline 8 - but I didn't think they'd been around as long as 1914!
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Marks DTM Calib

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Re: Honda Jazz (etc) Sparkplugs
« Reply #7 on: 24 October 2011, 19:17:50 »
The 1928 Rolls Royce Phantom 2 prince of wales edition car we had as a wedding car had twin spark to......and it even adjusted the timing between the two sparks dependent on rpm to!
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Andy B

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Re: Honda Jazz (etc) Sparkplugs
« Reply #8 on: 24 October 2011, 19:28:08 »
A 3 cylinder Smart Roadster has 6 spark plugs. 3 are easy to get at, the other 3 requires removal of the back of the car to gain access.
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Lazydocker

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Re: Honda Jazz (etc) Sparkplugs
« Reply #9 on: 24 October 2011, 22:00:54 »
ISTR that Alfa had to do it to meet emissions standards :-\
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