---
product_id: 197981795
title: "Spark Plugs E3.109 Premium Racing Spark Plug with Patented DiamondFIRE Technology, 14mm Thread, 0.708” Reach, 5/8” Hex, Taper Seat, Pack of 1"
brand: "e3"
price: "$16.47"
currency: USD
in_stock: true
reviews_count: 6
category: "E3"
url: https://www.desertcart.us/products/197981795-spark-plugs-e3-109-premium-racing-spark-plug-with-patented
store_origin: US
region: United States of America
---

# Patented DiamondFIRE tech for max spark efficiency Racing-grade design boosts power & fuel economy 14mm thread & 0.708” reach for precise fit Spark Plugs E3.109 Premium Racing Spark Plug with Patented DiamondFIRE Technology, 14mm Thread, 0.708” Reach, 5/8” Hex, Taper Seat, Pack of 1

**Brand:** e3
**Price:** $16.47
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite your engine’s full potential with DiamondFIRE precision!

## Quick Answers

- **What is this?** Spark Plugs E3.109 Premium Racing Spark Plug with Patented DiamondFIRE Technology, 14mm Thread, 0.708” Reach, 5/8” Hex, Taper Seat, Pack of 1 by e3
- **How much does it cost?** $16.47 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/197981795-spark-plugs-e3-109-premium-racing-spark-plug-with-patented)

## Best For

- e3 enthusiasts

## Why This Product

- Trusted e3 brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Race-Ready Precision:** 14mm thread and 0.708” reach engineered for high-performance fit and stability.
- • **DiamondFIRE Spark Edge:** Patented dual-leg ground electrode ensures faster flame propagation and cleaner combustion.
- • **Optimized for High RPM:** Non-resistor design with taper seat tailored for racing engines demanding peak performance.
- • **Power & Efficiency Boost:** Increases horsepower while reducing fuel consumption and hydrocarbon emissions.
- • **Durability Meets Compatibility:** Cross-compatible with top brands and backed by a limited lifetime warranty for long-lasting reliability.

## Overview

The E3.109 Premium Racing Spark Plug features patented DiamondFIRE technology with a dual-leg ground electrode for superior heat transfer and faster flame propagation. Designed with a 14mm thread, 0.708” reach, and 5/8” hex taper seat, it delivers enhanced power, improved fuel efficiency, and reduced emissions. Compatible with major spark plug brands and built for high-RPM racing applications, it offers durability backed by a limited lifetime warranty.

## Description

The E3.109 racing spark plug is a high-performance component designed for a variety of racing applications, built with a 14mm thread diameter, 0.708” reach, and a 5/8” hex. Featuring a taper seat and cold heat range, the E3.109 is a non-resistor spark plug that provides optimal performance in high-RPM engines. This spark plug is similar to the E3.108, but it comes with a distinct heat range and a projected core nose for enhanced functionality. Fitted with E3's patented DiamondFIRE ground electrode, our spark plug creates an edge-to-edge spark path, ensuring improved combustion by replenishing the spark zone with a fresh fuel/air charge. This results in faster, more efficient engine operation. The electrode is secured with two legs, allowing for excellent heat transfer and additional stability, which is essential for performance in high-RPM engines. The spark plug significantly increases engine power, reduces fuel consumption, and lowers hydrocarbon emissions over time. Its full-size center electrode and DiamondFIRE ground electrode also extend the product's lifespan while ensuring optimal performance. This spark plug is cross-compatible with Autolite AR93, AR94; Champion 280, 685, S59YC, S61YC; and NGK 7891, R5724-9.

Review: Use the E3 spark plug - I've been a mechanic since 1975, what people don't understand is that they don't have to put the spark plus that they call for in your lawnmower. I use the E3 plug. My lawnmower starts easy an I use less gas. Clean the plug an it will last a long time.
Review: Good spark - Good plugs, gave me 10 more hp and good gas mileage

## Features

- HIGH-PERFORMANCE DESIGN: Built for racing applications, the E3.109 spark plug is engineered to increase power, reduce fuel consumption, and improve hydrocarbon emissions
- DIAMONDFIRE TECHNOLOGY: Features E3’s patented DiamondFIRE ground electrode secured with dual legs for excellent heat transfer and unmatched performance stability
- OPTIMAL ENGINE EFFICIENCY: The patented DiamondFIRE ground electrode design enhances engine stability by promoting faster flame propagation, enabling a more complete burn of the fuel/air mixture
- RACING-SPECIFICATIONS: Specifically designed for high-performance racing applications, this spark plug features a 14mm thread, 0.708” reach, 5/8” hex, and a taper seat
- COMPATIBILITY AND DURABILITY: Cross-compatible with Autolite AR93, AR94; Champion 280, 685, S59YC, S61YC; and NGK 7891, R5724-9; backed by a limited lifetime warranty, ensuring long-lasting durability and reliable performance

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01JLYM1D4 |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #1,266,032 in Automotive ( See Top 100 in Automotive ) #2,051 in Automotive Replacement Spark Plug Wires #6,484 in Automotive Replacement Spark Plugs |
| Brand | E3 |
| Core Material | Copper |
| Customer Reviews | 4.2 4.2 out of 5 stars (62) |
| Date First Available | August 3, 2016 |
| Exterior | Machined |
| Global Trade Identification Number | 00894489000053 |
| Item Weight | 1.6 ounces |
| Item model number | E3.109 |
| Manufacturer | E3 Spark Plugs |
| Manufacturer Part Number | E3.109 |
| Model | E3 Race Spark Plug |
| OEM Part Number | E3.109 |
| Product Dimensions | 1 x 4 x 6 inches |
| Thread Size | 14mm |
| Top Material Type | Copper |
| UPC | 894489000053 |
| Vehicle Service Type | Racing Vehicle |

## Product Details

- **Brand:** E3
- **Core Material:** Copper
- **Thread Size:** 14mm
- **Top Material Type:** Copper
- **Vehicle Service Type:** Racing Vehicle

## Images

![Spark Plugs E3.109 Premium Racing Spark Plug with Patented DiamondFIRE Technology, 14mm Thread, 0.708” Reach, 5/8” Hex, Taper Seat, Pack of 1 - Image 1](https://m.media-amazon.com/images/I/61IDpPrIzML.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: Is the gap at 44mm ?**
A: E3.109 is a race plug. The gap for this plug is approximately 25 thousands.

**Q: E-3 spark plug for mtd 951-10292?**
A: E3.22 is the replacement for MTD 951-10292.

**Q: Will this fit my dodge charger RT  2006 with a 5.7 hemi in it if not which E3 plug will it take it?**
A: looked on Google, found that  e3 614 plugs fit the 5.7l hemi

**Q: Do you have a replacement plug for a ngk bpr 2 es ?**
A: No

## Customer Reviews

### ⭐⭐⭐⭐⭐ Use the E3 spark plug
*by M***E on May 31, 2024*

I've been a mechanic since 1975, what people don't understand is that they don't have to put the spark plus that they call for in your lawnmower. I use the E3 plug. My lawnmower starts easy an I use less gas. Clean the plug an it will last a long time.

### ⭐⭐⭐⭐⭐ Good spark
*by R***E on January 30, 2025*

Good plugs, gave me 10 more hp and good gas mileage

### ⭐⭐⭐⭐⭐ I have a cold air intake on the journey and also a performance chip
*by G***P on October 7, 2023*

Work very well w cold air intake and a performance chip added about 50 more hourse power

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-03*