Bosch Iridium Spark Plug 9612 - Read 1 Reviews on Bosch Iridium #9612

Bosch Iridium Spark Plug

Vehicle Specific

Part Number: 9612
Features & Benefits

The only iridium spark plug line engineered for both high performance and long life. The laser welded iridium tipped center and ground electrodes (Double iridium) provide exceptionally long life.

  • 4x longer service life vs standard copper spark plugs
  • Ultra fine wire iridium center electrode requires less voltage to fire delivering exceptional ignitability
  • The laser welded iridium tipped center and ground electrodes (Double Iridium) provide exceptionally long life
  • BOSCH exclusive tapered laser-welded iridium alloy tipped ground electrode delivers the ultimate in high performance
  • Factory set pre-gap ensures ease of installation.
Product Details
Part Number: 9612
Weight: 0.12lbs
Center Electrode Core Material: Nickel-Yttrium and Copper and Iridium
Center Electrode Tip Material: Iridium
Drive Size: 16mm
Ground Electrode Tip Material: Nickel-Yttrium and Iridium
Insulator Material: Ceramic
Insulator Type: Projected
Manufacturer Heat Range Number: 9
Package Quantity: 1
Reach (in): 0.75
Resistor: Yes
Seat Style: Tapered
Thread Size: 17 mm
Shipping Information: Overnight and Two Day shipping are not available for PO Box, APO/FPO/DPO or US Territory addresses.
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    Bosch Iridium Spark Plug

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    5

    This review is hidden because you have chosen to ignore Member 1370647634. Show DetailsHide Details

    What a difference!

    Using the Bosch Iridium's in a 2004 Sea Ray with 8.1 Mercruiser Horizon twin engines. These are essentially a marinized version of the Chevy truck engines and run at very high loads pushing a 18,000 pound boat. The original plugs were AC Delco's that lasted around 300 hours which is about 50% longer than Mercruiser recommends, but it was time to change them as I smelled unburned fuel at idle speed. Putting them in a boat motor requires removal of some hoses for the water cooled exhaust manifolds so you want to make sure the plugs last a long time as it takes time to do this job. My experience with the Bosch plugs in other vehicles made this a good choice. I noticed an IMMEDIATE difference in idle smoothness, no raw gas smell, and increased acceleration. Don't know whether this will significantly impact mileage, but they are sure to improve it. Time will tell on the longevity. Used anti-seize on the threads to be sure they don't create an issue with the aluminum heads.

    Pros: Quality, precision

    Cons: cost

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