Platinum spark plugs?
Yousuf Khan
over a regular copper one? Same question for the super-high-end iridium
plugs.
Yousuf Khan
1 Lucky Texan
extended change interval - maybe last 3 times longer.
I don't think there's anything else.
?????
cl...@snyder.on.ca
The iridium "fine-wire" plugs will fire at a lower voltage - and
therefore MAY fire more reliably. They are more resistant to fouling
(slightly)
As far as Plats are concerned, if the engine is waste-fire (double
ended coil) using single platinums is a waste of money - dual
platinums are required to do the job properly.
My beaf with the long life plugs is unless you pull them to check them
at about half life, there is a good chance they won't come out, at
least in one piece, when required.
Yousuf Khan
So the hype is warranted?
Yousuf Khan
Yousuf Khan
> As far as Plats are concerned, if the engine is waste-fire (double
> ended coil) using single platinums is a waste of money - dual
> platinums are required to do the job properly.
The single platinums were only $1.50 more than the non-platinums, so the
cost is no big deal. Why are dual platinums required? What's the difference?
> My beaf with the long life plugs is unless you pull them to check them
> at about half life, there is a good chance they won't come out, at
> least in one piece, when required.
Doesn't anti-seize lubricant prevent them from having trouble coming out?
Yousuf Khan
cl...@snyder.on.ca
wrote:
>cl...@snyder.on.ca wrote:
>> As far as Plats are concerned, if the engine is waste-fire (double
>> ended coil) using single platinums is a waste of money - dual
>> platinums are required to do the job properly.
>
>The single platinums were only $1.50 more than the non-platinums, so the
>cost is no big deal. Why are dual platinums required? What's the difference?
The platinum tip is designed to keep the electrode from "eroding" due
to electron transfer (I think that's what it is called) - with waste
spark half the plugs fire backwards - so it is the gtound electrode
that "erodes" - dual plats have platinum wafer on both electrodes.
>
>
>> My beaf with the long life plugs is unless you pull them to check them
>> at about half life, there is a good chance they won't come out, at
>> least in one piece, when required.
>
>Doesn't anti-seize lubricant prevent them from having trouble coming out?
It helps. Too much can cause other problems (like misfire)
I've seen plugs installed with antiseize that would not come out 5
years later.
>
> Yousuf Khan
Todd H.
I've been told they're bad news in these engines and to stick with a
regular NGK.
--
Todd H.
2001 Legacy Outback Wagon, 2.5L H-4
Chicago, Illinois USA
1 Lucky Texan
my wife's Outback (H6) has them from the factory.
???
YKhan
> Todd H.
> 2001 Legacy Outback Wagon, 2.5L H-4
> Chicago, Illinois USA
Second question, is it worth my time to try to change my own spark
plugs? Today I tried doing it, and found everything was too cramped.
Is this something that's easier done from underneath? A few of the
wires were easily accessible, mostly the front cylinders, but the rear
cylinders seem to be highly congested. I left them alone for now,
awaiting opinions. Mine's an 2.5L H4 too.
Yousuf Khan
cl...@snyder.on.ca
wrote:
You think a SOOB is difficult to change plugs on? Good thing you
don't have a 6 cyl mystique, or a PT Cruiser, or a V6 TransSport, or a
6 cyl Aerostar.
A Soob is EASY to get at in comparison any of them.
Todd H.
On my H4, some discussions many years ago convinced me that this was
out of money saving to pain in my ass sweet spot, so I have it done
professionally.
--
YKhan
> On my H4, some discussions many years ago convinced me that this was
> out of money saving to pain in my ass sweet spot, so I have it done
> professionally.
It looks like on one side I'd have to remove the battery, and on the
other side I'd have to remove the airbox. I can remove the battery
easily, but don't know what to do with the airbox.
A Canadian Tire store quoted me 1.5 hours labour to do this. I wonder
if Subie mechanics can do this quicker?
Yousuf Khan
1 Lucky Texan
I think you're discovering why it might make sense to shell out $$$
for longer lasting plugs.
;^)
XR650L_Dave
Yeah, because they're so hard to get to- no one wants to change 'em
more than every 60K.
Dave
Hachiroku ハチロク
LOL! Next we'll have him buying iridium! ;)
Really, platinum is good for about 75-100,000 miles, and back in the day
Toyota specified them for their EFI engines. I'd stay with what's proven.
Yousuf Khan
> Really, platinum is good for about 75-100,000 miles, and back in the day
> Toyota specified them for their EFI engines. I'd stay with what's proven.
My dealer did finally replace the spark plugs, they were platinums. He
said that that's what's recommended for Subies.
Yousuf Khan
Hachiroku ハチロク
Yup...
Hachiroku ハチロク
You can "upgrade" to iridium, but since you're replacing them you
probably have ~100,000 on the car. Sit back and relax for the next
100,000...
Big Jim
the way. From there its incredibly easy. Go to Subie dealer and get oe
plugs and wires.
Big Jim
least on 04 outbacks. Took me tops 1 hour and I was in no hurry.
I'll do it again in 30k miles with no trepidation. Platinums dont
really work better. My 94 Trooper ran better with the Plain NGK's
than with the platinums.
On Oct 12, 4:41 pm, XR650L_Dave <spamTHIS...@yahoo.com> wrote:
>
> Yeah, because they're so hard to get to- no one wants to change 'em
> more than every 60K.
>
> Dave- Hide quoted text -
>
> - Show quoted text -
y_p_w
> On Fri, 09 Oct 2009 19:11:41 -0400, Yousuf Khan <bbb...@yahoo.com>
> wrote:
>
> >cl...@snyder.on.ca wrote:
> >> As far as Plats are concerned, if the engine is waste-fire (double
> >> ended coil) using single platinums is a waste of money - dual
> >> platinums are required to do the job properly.
>
> >The single platinums were only $1.50 more than the non-platinums, so the
> >cost is no big deal. Why are dual platinums required? What's the difference?
>
> The platinum tip is designed to keep the electrode from "eroding" due
> to electron transfer (I think that's what it is called) - with waste
> spark half the plugs fire backwards - so it is the gtound electrode
> that "erodes" - dual plats have platinum wafer on both electrodes.
Not sure, but are you thinking of "electromigration"?
http://en.wikipedia.org/wiki/Electromigration
That's a key concern in metal layers forming interconnect (wires) in
integrated circuits. The problem happens more often when the current
is relatively high and the width of the interconnect is minimum width
- especially when aluminum is used. Often design rules state that
there should be a minimum width to interconnects for certain
applications, and sometimes copper is added to aluminum to reduce the
effect. Now they use copper interconnects which aren't as
susceptible.
Platinum can certainly erode due to heat. I remember the Japanese car
specialist I take my cars to used to use Bosch single platinums. They
noted that quite a few came back with the center electrode pretty much
completely eroded. Those use a thin platinum wire buried flush in the
insulator. Since then they primarily go with Denso.
My understanding about spark plug effectiveness is that with
conventional plugs (that develop a corroded finish) a newer plug with
"sharp edges is easier to fire. Eventually the material wears away
and the edges blunt. If you've seen the NGK V-Power and Denso U-
groove, they're trying to add extra edges to the center or ground
electrode. Good double platinums don't seem to need the sharp edges
to fire properly if the platinum areas are properly sized to both keep
clean and prevent erosion.
cl...@snyder.on.ca
wrote:
>On Oct 9, 4:21 pm, cl...@snyder.on.ca wrote:
>> On Fri, 09 Oct 2009 19:11:41 -0400, Yousuf Khan <bbb...@yahoo.com>
>> wrote:
>>
>> >cl...@snyder.on.ca wrote:
>> >> As far as Plats are concerned, if the engine is waste-fire (double
>> >> ended coil) using single platinums is a waste of money - dual
>> >> platinums are required to do the job properly.
>>
>> >The single platinums were only $1.50 more than the non-platinums, so the
>> >cost is no big deal. Why are dual platinums required? What's the difference?
>>
>> The platinum tip is designed to keep the electrode from "eroding" due
>> to electron transfer (I think that's what it is called) - with waste
>> spark half the plugs fire backwards - so it is the gtound electrode
>> that "erodes" - dual plats have platinum wafer on both electrodes.
>
>Not sure, but are you thinking of "electromigration"?
>
>http://en.wikipedia.org/wiki/Electromigration
>
>That's a key concern in metal layers forming interconnect (wires) in
>integrated circuits. The problem happens more often when the current
>is relatively high and the width of the interconnect is minimum width
>- especially when aluminum is used. Often design rules state that
>there should be a minimum width to interconnects for certain
>applications, and sometimes copper is added to aluminum to reduce the
>effect. Now they use copper interconnects which aren't as
>susceptible.
Bosch platinum plugs are CRAP