Granatelli Precision Spark Plug Gapping Tool for Turbo, Supercharged & Performance Engines – 540109
GRANATELLI PRECISION IGNITION TOOLS
DON’T EYEBALL YOUR SPARK PLUG GAP — SET IT.
The Granatelli 540109 Spark Plug Gapping Tool gives racers, engine builders and performance enthusiasts a controlled way to accurately adjust spark plug electrode gap without relying on crude bending or guesswork.
Designed for repeatable spark plug gap adjustment, it is especially useful for turbocharged, supercharged and high-boost engines where the correct plug gap can make the difference between clean ignition and a misfire under load.
IGNITION BASICS THAT ACTUALLY MATTER
Why Spark Plug Gap Matters
Spark plug gap directly affects how the ignition system fires the air/fuel mixture. On high-performance, turbocharged and supercharged engines, increased cylinder pressure can make the spark harder to maintain. A properly set plug gap helps support consistent ignition and reduces the chance of misfire under load.
Precision Without the Guesswork
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01
Secure the PlugPosition the spark plug for controlled adjustment. |
02
Adjust GraduallyMove the electrode in small, controlled increments. |
03
Measure & VerifyConfirm the final gap with the proper measuring gauge. |
Built for the Workbench, Race Trailer or Garage
● Turbocharged Engines ● Supercharged Engines ● High-Boost Builds ● Race Engines ● Street Performance ● Engine Builders
Why Use a Dedicated Spark Plug Gapping Tool?
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✓ More Controlled Adjustment Helps move the electrode gradually instead of bending it aggressively. |
✓ Repeatable Plug Setup Makes it easier to prepare an entire set of spark plugs consistently. |
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✓ Performance Engine Friendly Useful when plug gap is being adjusted around boost, ignition output or tuning requirements. |
✓ Shop-Grade Construction Designed for repeated garage, engine-shop and trackside use. |
TOOL DETAILS
Product Specifications
| Part Number | 540109 |
| Product Type | Spark Plug Gapping / Adjustment Tool |
| Primary Function | Controlled Spark Plug Gap Adjustment |
| Recommended Use | Street, Performance, Turbo, Supercharged & Racing Engines |
| Application | Universal Performance Tool |
SPARK PLUG SETUP NOTE
There is no universal “best” spark plug gap. Always set the plug gap according to the engine combination, spark plug manufacturer, ignition system, boost level and tuner or engine-builder recommendation. Measure the final gap with a proper spark plug gap gauge after adjustment.
Products received may vary slightly from images due to manufacturing tolerances or supply chain variables.
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