---
product_id: 354766490
title: "Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack"
brand: "autolite iridium ultra"
price: "220 Lei"
currency: RON
in_stock: true
reviews_count: 5
category: "Autolite Iridium Ultra"
url: https://www.desertcart.ro/products/354766490-autolite-ar3910x-ar-high-performance-racing-non-resistor-spark-plug
store_origin: RO
region: Romania
---

# Cut-back electrode for faster ignition 8% cooler side wire temp Vehicle-specific precision fit Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack

**Brand:** autolite iridium ultra
**Price:** 220 Lei
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite your engine’s full potential with Autolite Racing Spark Plugs!

## Quick Answers

- **What is this?** Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack by autolite iridium ultra
- **How much does it cost?** 220 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/354766490-autolite-ar3910x-ar-high-performance-racing-non-resistor-spark-plug)

## Best For

- autolite iridium ultra enthusiasts

## Why This Product

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

## Key Features

- • **Race-Proven Durability:** Yttrium-enhanced alloy cuts side wire temp by 8%, extending spark plug life under extreme conditions.
- • **Tailored for Your Ride:** Precision vehicle-specific fit ensures optimal performance without the hassle of gapping or adjustments.
- • **Ignite Faster, Win Sooner:** Cut-back ground electrode design accelerates flame kernel growth for quicker, more reliable ignition.
- • **Trusted by Pros, Loved by Racers:** Used by professional drivers and kart racers alike—don’t get left behind when it’s go time.
- • **Corrosion-Resistant Chrome Finish:** Nickel plating guarantees long-lasting protection against rust and wear, keeping your engine firing strong.

## Overview

Autolite AR3910X Racing Spark Plugs feature a yttrium-enhanced alloy that reduces side wire temperature by 8% for improved durability and less pre-ignition. Their cut-back ground electrode design promotes faster flame kernel growth, ensuring quicker ignition. Nickel-plated for corrosion resistance and precision-fit for specific vehicles, these plugs are trusted by professional racers and engineered to deliver high-performance reliability.

## Description

Autolite Racing Spark Plugs are used by many professional race car drivers. These spark plugs contain an Yttrium-Enhanced Alloy, which enables up to 8 percent reduction in side wire temperature for improved durability and less pre-ignition. Autolite racing plugs are available in colder heat ranges than most plug manufacturers to support modified engines and feature a cut background electrode for improved ignitibility and faster flame kernel growth. They are also nickel plated for a long-lasting, corrosion-resistant finish. Since its inception, the Autolite brand has provided the automotive aftermarket and Original Equipment manufacturers the highest quality ignition products. Autolite has been in operation for over 100 years and has produced more than 11 billion spark plugs and glow plugs. These plugs are specifically designed for each application to meet or exceed OE quality and performance. Autolite makes plugs for Japanese, European, and Korean cars as well as plugs for Lawn & Garden and Power Sports. As a leading supplier of spark plugs, the Autolite brand has the right ignition products for your application, regardless of make or model, import or domestic.

Review: works great with 212 predator hemi/non-hemi. great for if you have a longer connecting rod + piston head setup like me so the spark plug doesn't hit the piston head. very easy to install and no more gapping the spark plug. gives a strong spark to all four corners of the plug. have a few of them now and will continue to buy them in the future.
Review: Worked well - bought these in bulk for a kart racing weekend. I change them out twice during the weekend of hard racing because I do not want to be that parent that can't get their kid's kart started when it's go time!

## Features

- Package Dimensions: 10.795 H x 2.997 L x 8.991 W (centimetres)
- Package Weight: 0.181 kilograms
- Country of Origin : Mexico
- Features cut back ground electrode for improved ignitability of flame kernel
- Fit type: Vehicle Specific

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00IAAVU56 |
| Best Sellers Rank | #111,203 in Automotive ( See Top 100 in Automotive ) #712 in Automotive Performance Spark Plugs |
| Brand | Autolite Iridium Ultra |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,065) |
| Date First Available | 2 September 2015 |
| Exterior | Chrome |
| Item Weight | 54.4 g |
| Item model number | AR3910X-4PK |
| Manufacturer | Autolite |
| Manufacturer Part Number | AR3910X-4PK |
| Model | AR3910X-4PK |
| Position | Center |
| Product Dimensions | 3.56 x 1.14 x 0.41 cm; 54.43 g |

## Product Details

- **Brand:** Autolite Iridium Ultra
- **Core material:** Nickel
- **Thread size:** 14mm X 1.25
- **Top material type:** Alloy Steel
- **Vehicle service type:** Car

## Images

![Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack - Image 1](https://m.media-amazon.com/images/I/71Bq-jTkqeL.jpg)
![Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack - Image 2](https://m.media-amazon.com/images/I/81Qh3Rx2YFL.jpg)
![Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack - Image 3](https://m.media-amazon.com/images/I/81qS1Ks6FcL.jpg)
![Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack - Image 4](https://m.media-amazon.com/images/I/71Jo61loCbL.jpg)
![Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack - Image 5](https://m.media-amazon.com/images/I/81C0GaELbSL.jpg)

## Available Options

This product comes in different **Number Of Items** options.

## Questions & Answers

**Q: This spark plug makes my Predator - 212cc engine run very hot compared to a standard spark plug, is it normal to gain 30+ temps using this plug?**
A: It can increase the heat of the engine if you only have stock parts, and could overheat it. I have a bigger fuel jet to let more fuel in, odd as it may seem, more gas cools the engine. These plugs burn basically all the gas that goes in, thus it will get hotter. I would recommend a larger fuel jet, mine hasn't overheated since I got one...Gives a noticeable amount more power as well (Gave my 500 pound go kart 10mph more speed).     ;)

**Q: What size plug wrench does this plug take?**
A: 11/16

**Q: How much longer are these compared to NGK race plugs extened tip ?**
A: Same

**Q: Does it increase horse power**
A: It’s more about slightly increasing compression do to plug design lowering the cc’s in the head!   It’s true!

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by O***R on 20 September 2024*

works great with 212 predator hemi/non-hemi. great for if you have a longer connecting rod + piston head setup like me so the spark plug doesn't hit the piston head. very easy to install and no more gapping the spark plug. gives a strong spark to all four corners of the plug. have a few of them now and will continue to buy them in the future.

### ⭐⭐⭐⭐⭐ Review
*by D***E on 19 January 2026*

Worked well - bought these in bulk for a kart racing weekend. I change them out twice during the weekend of hard racing because I do not want to be that parent that can't get their kid's kart started when it's go time!

### ⭐⭐⭐⭐⭐ Review
*by L***K on 13 December 2025*

These are like brisk plugs but a quarter of the cost great upgrade for plugs as long as you know your heat range.

## Frequently Bought Together

- Autolite-AR3910X Ar High Performance Racing Non-Resistor Spark Plug, 4-Pack
- Autolite AR3933X-4PK High Performance Racing Non-Resistor Spark Plug, 4 Pack

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-04-23*