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Champion Iridium Spark Plug (RER8ZWYCB4): Maximum Performance & Longevity
7 yr replacement if defective
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Product Information
Product Details
Part No. 9407
Warranty Details (7 YR REPLACEMENT IF DEFECTIVE)
Champion Iridium spark plug is engineered for drivers who demand peak performance and durability. Featuring a fine-wire iridium center electrode and a platinum-enhanced ground electrode, it delivers exceptional ignitability and a sharper spark focus for maximum engine efficiency. The V-trimmed ground electrode ensures consistent performance, while the Heat-Active alloy quickly reaches and maintains optimal operating temperatures under all engine loads. Designed with a flat seat type for a secure fit, this premium spark plug also includes a built-in resistor to minimize electromagnetic interference and enhance overall engine performance. Whether you're looking for longevity or top-tier ignition reliability, this performance-grade spark plug is built to exceed expectations.
Product Features:
Product Features:
- Champion Iridium - Maximum Performance. Premium Spark Plug
- Iridium center electrode delivers maximum life
- Fine-wire center electrode and V-trimmed for greater ignitability
- V-trimmed ground electrode promotes sharper spark focus
- Maintains stable operating temperature under all engine loads
- Heat-Active alloy allows electrodes to reach optimal temperature quickly
- Flat Seat Type: Designed with a flat seat type for a secure fit and optimal performance.
- Built-In Resistor: Includes a resistor to ensure superior engine performance and reduce electromagnetic interference.
Specifications
Center Electrode Design:
Fine Wire
Center Electrode Diameter (Inch):
0.078 in
Center Electrode Tip Material:
Iridium
Electrical Terminal Type:
Non-Removable Nut
Gap Style:
J Gap
Grade Type:
Performance
Ground Electrode Core Material:
Nickel
Ground Electrode Material:
Nickel Copper Alloy
Ground Electrode Quantity:
1
Ground Electrode Tip Design:
J Gap
Ground Electrode Tip Material:
Iridium-Platinum
Hex Size:
0.625 in
Hex Type:
Hex
Indexed:
No
Installed Height (Inch):
1.99 in
Insulator Height:
0.08 in
Manufacturer Heat Range:
8
Part Description:
Spark Plug
Pre-Gap Size:
1.05 mm
Reach:
1.103 in
Resistor Type:
Yes
Seat Type:
Flat
Thread Diameter:
12.000 mm
Washer Type:
Crush
Washer(s) Included:
Yes
4.77 out of 5
222 Customer Reviews
94% of respondents would recommend this to a friend
Ratings Distribution
5 Stars
189
4 Stars
25
3 Stars
2
2 Stars
1
1 Star
5
Pros
2
Increases Power
1
Durable
1
Easy To Install
1
Improves Engine Efficiency
Cons
1
Non
Best Uses
2
Replacement
1
Everyday Driving
1
Performance Driving
Car & Truck
1
Auto Enthusiast
Describe Yourself
1
Casual Driver
Most Liked Positive Review
Best plug ever !!!
This is the best my BMW 530i has ever performed, With these Champion Iridiums.
Most Liked Negative Review
Iridium Champions in my 2012 Charger
I went to install these in my Charger for the 2nd time. The first time I just snugly tightened them. This 2nd time I tightened them to the specs stated and 4 of the 6 broke inside. It separated from the area where where the threads are to the head head around the plug.
Now keep in mind that the plugs worked well in my car before this 2nd change for 40K miles and were still good. Only changed due to a scheduled maintenance exchange. There is always the possibility that the torques specs were wrong, or Iridium isn't the strongest metal, or my torque wrench may not have worked properly.
Reviewed by 222 Customers
Best plug ever !!!
Staff Reviewer -
This is the best my BMW 530i has ever performed, With these Champion Iridiums.
Bottom Line Yes, I would recommend to a friend
not a good fit
After replacing the engine misfires, shakes, and loss of power. Checked again and found the plugs were loose. Tried to tighten them and they were very easy to unscrew back. You can never make them tight enough. Finally, find that plugs are not proper fit. They never stay tight. Put back the old NGK plugs and car runs fine.
Bottom Line No, I would not recommend to a friend
Big difference
Verified Buyer -
If you have a HEMI, this is what you must have
Bottom Line Yes, I would recommend to a friend
OEM replacement
Works as it should.
Bottom Line Yes, I would recommend to a friend
These last forever
Verified Buyer -
Used these to replace this exact brand and number spark plug in my Jeep after 140,000 miles/ 8 years. Car was still running smoothly, no misfires and plugs still looked fine, but gap has increased a little. I'd swear by them.
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