question about iridium spark plugs
did a search about iridium spark plugs, and got even more confused. im in a need for a tune up, badly, and well im looking at iridiums, i got the money but dont know if i want to spend it on that. i know it makes minor differences like smoother idle, and a bit more power, etc. ive been hearing about the BR10EIX model type, that goes on some bikes. i thought rotary sprak plugs had to be flat at the end, does it not have to be? anyway heres my question:
-why should i pay $30-35 for special rotary iridium spark plugs, when i can just get the BR10EIX for $7? -would 10 be the best heat rating for my list of mods? ill also be getting an exhaust soon. -and what kind of gap should i use if i use the BR10EIX? |
unless you've got more than 400 to the wheels, you'll be fine with either stock plugs or all trailing.
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thank but can anyone else answer the other questions? if i can get the $7 iridiums, or pay$4-5 bucks for regular, im going with iridium. but is that the right kind i should get, BR10EIX? and is this heat range fine?
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the 10's might foul out. also, they're the conventional style-which shrouds the spark from the combustion area making it a little harder to ignite and slightly less efficient.
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so i should go with the ones that are made for the rotary, the flat kind? and i should probably get a 9 then?
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what do your plugs look like now--are you burning them out?
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havent pulled them out yet, they were slightly used sparkplugs from my old motor, and then i a rebuilt turbo motor, and i have a about 10k on the motor, along with whatever else i had from the first motor. and its starting to drive a bit rough.
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10k??
i change mine every other oil change. LOL seriously though, take a good look at them and see what they look like. i'm thinking you'd be ok with stock plugs though--at least for now. |
Installing the RX-8 Iridium plugs over new stock plugs on a mildly modifed S5 TII was worth 4 hp on the dyno. Idle and top-end was slightly smoother too.
These plugs cost $280 Cdn at the dealership... that's about $200 USD for all four.... However, they don't seem to be showing signs of wear near as quickly... |
that's $50/hp!!!
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HKS also makes iridium plugs for the fc's.
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Cause the reach on those bike plugs are not as long as the rotary specific ones...
-Ted |
afaik iridium plugs don't make much difference performance wise, the main advantage is longer life of the plug because of the conductor material being harder to burn away over time. I wouldn't bother going much more than oem plugs, heat range you should check the plugs condition (fouled or overheated?) before you decide what heat range to use.
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but the insulator still goes away...and broke off on 2 of mine when i tried them.
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Talking to my local Rotary guru, I am in the process of placing 4x RX8 plugs in my Series 7..
However I have managed to get them for $20 aus each which is about $14US each...(Considerably less than the $50 US each quoted above...) |
The best value I've found - good for ~4 oil changes.
(leading) NGK BUR7EQP - platinum - from Advance Auto Parts - $6.95 each. (trailing) NGK BUR9EQ - standard - $4.95 each. |
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