There are single and double iridium plugs is there enough difference in performance or life for the difference in price.
Bosch iridium spark plugs
- Thread starter Fitter30
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Its not performance its longevity. The gap stays the same the same longer than traditional plugs.
regular plugs should be changed at ~ 30K miles. Iridiums often go 100K miles.
regular plugs should be changed at ~ 30K miles. Iridiums often go 100K miles.
Which one you need depends on the ignition system. Waste spark systems require double precious metal electrodes for the longest life.
These systems are easily identified by the use of 2 plug wires per coil eg a 4 cyl engine with 2 coils with 2 wires are in each coil.
Coil on plug and systems using a single coil and each cyl has its own wire coming from a cap are not waste spark. These do not require double precious metal electrodes, a single will provide long life.
These systems are easily identified by the use of 2 plug wires per coil eg a 4 cyl engine with 2 coils with 2 wires are in each coil.
Coil on plug and systems using a single coil and each cyl has its own wire coming from a cap are not waste spark. These do not require double precious metal electrodes, a single will provide long life.
Too bad Bosch stopped making the Platinum-Ir Fusion 4-prong iridium spark plugs. These were a godsend in Toyota's 1MZ wasted spark engines!
The 1MZ requires 2-prong platinum plugs, but since a transverse V6 is impossible to work on, and this particular engine is one of the worst, iridium is a MUST!
But nooooooooooooo, Denso and NGK won't make an iridium 2-prong for these cars, only platinum, which is only good for 60k (the Denso iridium type number would be SK20TR11)
Bosch came to the rescue with a 4-prong iridium! So you won't have to do them again for a long time!
The 1MZ requires 2-prong platinum plugs, but since a transverse V6 is impossible to work on, and this particular engine is one of the worst, iridium is a MUST!
But nooooooooooooo, Denso and NGK won't make an iridium 2-prong for these cars, only platinum, which is only good for 60k (the Denso iridium type number would be SK20TR11)
Bosch came to the rescue with a 4-prong iridium! So you won't have to do them again for a long time!
I currently use Bosch silver +4. Tried iridium and platinum and others but only single electrode copper or 4 electrode silver have satisfied me.
Thanks for the input
Originally Posted By: NH73
If platinum plugs are only good for 60,000 miles, how comes did Ford in 2004 use a platinum plug and said they are good till 100,000 miles?
The applications I mentioned are older than 2004 and have wasted spark ignition, which is harder on spark plugs
If platinum plugs are only good for 60,000 miles, how comes did Ford in 2004 use a platinum plug and said they are good till 100,000 miles?
The applications I mentioned are older than 2004 and have wasted spark ignition, which is harder on spark plugs
I would use whatever the OE plug is. Sometimes modern cars can be sensitive to the type of spark plug.
For instance in my car the OE was double platinum, so I saw no reason to spend extra for platinum/iridium.
For instance in my car the OE was double platinum, so I saw no reason to spend extra for platinum/iridium.
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