Spark Plug Question. I searhced. It's about RX-7 plugs.
11-10-2008, 09:17 PM
#27
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well, i think the biggest difference would be the metal that makes up the center electrode. the platinum plugs use platinum (duh), and the stock rx8 plugs use iridium.
here's a pic i found on sparkplugs.com (complete with horrid jpeg artifacting), it shows the different properties of the different metals used in spark plugs.
now, what do all these number mean? i think the short of it would be, the platinum plugs won't last as long as the iridium plugs...but i'm not a metalurgist, nor do i play one on tv, so i may be way off.
here's a pic i found on sparkplugs.com (complete with horrid jpeg artifacting), it shows the different properties of the different metals used in spark plugs.
now, what do all these number mean? i think the short of it would be, the platinum plugs won't last as long as the iridium plugs...but i'm not a metalurgist, nor do i play one on tv, so i may be way off.
nevermind on my previous post.
though i'm not really comfortable reading fractions... higher resistance for the platinums vs. iridiums are higher resistance nonetheless!
i guess i've answered my own question upon someone's help on this bit of info.
i guess for the price... the only way i'd do this is to run a new set EVERY year!
i'd like to know how these plugs hold up to 9k rpm repeatedly. please post at the slightest sign of misfire please. this may make or break my purchase for plugs next year...
thanks
edit:
p.s. i see no way around the cost... but i can honestly see the oem rx-8 plugs as upgrades for the rx-7, with cost not being a factor for any loving FD owner. but the other way around, i'm very very skeptical. will the higher heat and resistance spell disaster for our coils?
Last edited by TrochoidMagic; 11-10-2008 at 09:32 PM.
11-12-2008, 12:07 AM
#30
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I used the rx7 plugs for the whole summers, that is with about 6 track events. Worked great. Just when the weather gets cold here. My car started to have hot start problems. Car will flood, and can't fire ONLY when engine is hot. When it's cold, starts like normal. So, i put my older rx8 plugs in there for now. Hot start problem is gone. Two of the rx7 leading plugs looks pretty carbon up, i dont' know if that's the problem with the plugs, or the change of weather. The trailing plugs looks like it burns really good, nice brown and no carbon or **** on it. (I do have the shims for the trailing plugs, i don't know if it works without shims)
Now i have some rx8 plugs coming, but will try rx7 plugs again.
Now i have some rx8 plugs coming, but will try rx7 plugs again.
Last edited by dmak_el; 11-12-2008 at 12:09 AM.
11-13-2008, 10:55 PM
#31
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^^ thanks for the insight dmak,
and for the same reasons and some that you stated, i will not use RX-7 plugs UNLESS i have an emergency.
BUT, our RX-8 plugs really do look like something the 7 guys can upgrade to.
and for the same reasons and some that you stated, i will not use RX-7 plugs UNLESS i have an emergency.
BUT, our RX-8 plugs really do look like something the 7 guys can upgrade to.
11-14-2008, 11:00 AM
#35
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Exactly... I even run the RX-8 Iridiums in my 10th Anniversary Edition RX-7 on the leading.
See even the platinum plugs NGK (BUR7EQP) wear out way too fast on the leading position. By 10K miles they are shot, heck after 5K miles they are already starting to round (the center electrode should have a sharp edge for the best most powerful spark).
Vs 30K miles for the Iridiums.
Iridium is a metal that is 6 times harder and 8 times stronger than platinum, it has a 1,200=F higher melting point than platinum and conducts electricity better.
There is not a single reason to cheap out on spark plugs. Cheaping out on spark plugs is like using 30wt oil because you are too cheap to buy 5W30 or 20W50.
See even the platinum plugs NGK (BUR7EQP) wear out way too fast on the leading position. By 10K miles they are shot, heck after 5K miles they are already starting to round (the center electrode should have a sharp edge for the best most powerful spark).
Vs 30K miles for the Iridiums.
Iridium is a metal that is 6 times harder and 8 times stronger than platinum, it has a 1,200=F higher melting point than platinum and conducts electricity better.
There is not a single reason to cheap out on spark plugs. Cheaping out on spark plugs is like using 30wt oil because you are too cheap to buy 5W30 or 20W50.
Last edited by Icemark; 11-14-2008 at 11:03 AM.
11-14-2008, 09:35 PM
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11-15-2008, 04:21 PM
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The "deal" is that rotary plugs have always been 21mm reach...... until the Renesis, that is. The Renesis uses 19mm reach plugs on the trailing side now. as such, to use the older 21mm plugs in the new 19mm trailing side requires a 2mm shim to keep the FD plugs from bottoming out on the housing and possibly causing distortion.
12-09-2008, 05:35 PM
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well i used to have all t plugs on the car, thats how scott put it. and i just changed it to 2 t plugs and 2 L spark plugs... and i have the greddy turbo kit and is running very very nice