In my last post I forgot to mention intake charge turbulence, Which surely
must be a factor in this somehow, But I am not an engineer or fluid dynamics
specialist, so I have to leave that portion of theory up to someone a whole
lot smarter than I is!
Any thing else I forgot?
What I have heard is that the turbulence, which increases with RPM
(obviously), improves combustion speed at higher rpm and this is why timing
advance is all in by 2500-3500 rpm in most applications. Apparently there is
little or no gain to be had with further advance at higher rpms..? Not sure
if this is just for "street" applications or applies to those 15-19,000 rpm
screamers as well....
Cheers, G'night
Daryl
> The main difference in the flame spread between most of the
> multi-electrode plugs and a "standard" plug seems to be that the ground
> electrode doesn't block the flame front from going more toward the center
> of the combustion chamber. I assume that the engineers took flame spread
> into account when they design cylinder heads so that a standard plug would
> work best, but I am not one of those engineers.
>
> One other thing that I see is even though the ground electrode wears
> faster than the center electrode, the center electrode does wear down,
> which begs the following question. If the ground electrode has been
> multiplied to allow for longer wear, what about the center electrode wear?
> Seems like they should be adding multiple center electrodes also! (As I
> recall the Bosch plus 4 has a rather large, flat center electrode, which
> would address this issue.)
>
> After looking at the E3 web site I find it interesting that their "about
> the company" section doesn't say much about them, but rather their spark
> plug design! They may have a patent that covers many electrode
> configurations, those configurations may not work! Hmm I have to go now. I
> think I need to design a spark plug with insulators that look like super
> models, or, for us Roadster types, Mr. K! They may not work, but who
> cares, if they look good! Then I'll have to design clear plug wires so
> they won't get in the way of seeing the insulators. WAIT! For the rice
> rockets how about insulators that glow blue! Oh Wow! How about a whole
> line of anatomically shaped plugs!
>
> Peace,
> Pat
>
> Peace,
> Pat
>
> Daryl Smith wrote:
>
>> ----- Original Message ----- From: "Daryl Smith" <drlsmith@telus.net>
>> To: "sidney raper" <spl310@hotmail.com>
>> Sent: Wednesday, July 06, 2005 10:55 PM
>> Subject: Re: Another new be all end all spark plug
>>
>>
>>> Well, It doesn't say they were assembled using toothpicks! :-)
>>>
>>> This E3, the Bosch "Plus 4"(4 ground straps) and the "Firestorm" all
>>> look like variations of the same idea. I noticed they don't show the
>>> shape of their centre electrode though. Hmmm.
>>>
>>> In the June issue of Grassroots Motorsports, David Vizard says "Probably
>>> the principle asset to the multi-electrodes is their longer life and
>>> reduced emissions toward what would be the end of a single electrode
>>> plug's life."
>>>
>>> I think I'll have to see if I can find any claims on other
>>> multi-electrode plugs for comparison. Anyone besides Bosch make them?
>>>
>>> Daryl
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