1205 E Main St
Columbus, OH 43205
- Shop All
- Replacement Parts
- Performance Parts
- Accessories
- Oil & Fluids
- Special Offers
- Speed Perks
- Advice & How-Tos
- Project Guides
How Would You Like To Get This Item?
Store Pickup
Out of Stock
At 1205 E Main StColumbus, OH
Same Day Home Delivery
Home Delivery
FREE for orders over $35
Standard Delivery Available
Curbside pickup is available at most stores
Product Information
Product Details
Part No. AR3910X
Warranty Details (2 YR REPLACEMENT IF DEFECTIVE)
Autolite Racing spark plugs are engineered with a cut-back ground electrode, anti-corrosive nickel plating, and large ground electrode that deliver better heat transfer, ensuring maximum engine performance on the track.
Product Features:
Product Features:
- Engineered with a cut-back ground electrode that delivers optimal ignitability of the flame kernel and better heat transfer, leading to quicker starts.
- The yttrium-enhanced alloy enables up to 8% reduction in ground wire temperature for colder heat ranges designed to enable performance modifications and handle intense conditions.
- Designed with an anti-corrosive nickel-plating prevents rusting better than black oxide, allowing the plug to maintain its durability and efficiency.
- Its high alumina multi-rib ceramic insulator provides thermal conductivity and superior insulation for increased strength while preventing flash-over.
- Enhanced Performance: The Autolite Racing Non-Resistor Spark Plug features a surface gap design that increases the Compression Ratio, delivering superior performance in racing conditions.
- Durable Under Intense Conditions: Engineered to handle extreme conditions, this spark plug operates extremely cold, making it nearly impervious to pre-ignition.
- Consistent Performance: Despite the presence of fouling deposits, the Autolite Racing Non-Resistor Spark Plug maintains reliable performance, ensuring your engine runs smoothly.
Specifications
Center Electrode Core Material:
Copper
Center Electrode Design:
Standard
Center Electrode Projection:
Long Projection
Center Electrode Tip Material:
Nickel
Electrical Terminal Type:
Non-Removable Nut
Ground Electrode Core Material:
Nickel
Ground Electrode Quantity:
1
Ground Electrode Tip Design:
Surface Discharge
Ground Electrode Tip Material:
Steel
Hex Size:
5/8 in
Hex Type:
Hex
Indexed:
No
Insulator Material:
Ceramic
Manufacturer Heat Range:
15
Pre-Gap Size:
0.03 in
Reach:
0.702 in
Resistor Type:
No
Seat Type:
Flat
Skirt:
Yes
Thread Diameter:
14 mm
Washer Included:
Yes
4.69 out of 5
32 Customer Reviews
89% of respondents would recommend this to a friend
Ratings Distribution
5 Stars
28
4 Stars
2
3 Stars
0
2 Stars
0
1 Star
2
Pros
3
Improves Engine Efficiency
3
Increases Power
2
Durable
2
Easy To Install
1
Engine runs strong
Cons
1
Mmm
1
Plugs Do Not Make Power
1
They Restore Power If
1
They Were Fouled
1
Can not comment on this
Best Uses
3
Racing
1
410 ci. Alcohol engine 16:1 compression
Car & Truck
1
Competitive Driver
Describe Yourself
2
Auto Enthusiast
1
Mechanic
1
Race engine builder tun
Most Liked Positive Review
Black Friday can't beat this deal
I have used this product in all my blown & injected alky burning sbc engines with great success from reliability,performance and longevity.
I have also started to use this product in a triple turbocharged alky burning tractor puller that i help work on that belongs to a friend of mine that we had some problems with other brands before. they seem to hold up better since we changed over to a pro mag 44 ignition.
Most Liked Negative Review
wrong plugs
they were the wrong plugs I put all the right info and got plugs that were wrong
Reviewed by 32 Customers
I would buy this product again.
Submitted 3 years ago
I purchased a set of these plugs (8). They charged me for the set. Then canceled my order. Then sent me 4.? Guess there is a demand for this particular plug AR94 Autolite. Now they are out of stock. No ETA on when they'll have more.
Bottom Line Yes, I would recommend to a friend
Autolite plugs
Verified Buyer - Submitted 4 years ago
Nice products and prices are great
Would buy again
Verified Buyer - Submitted 4 years ago
Cheap and fit perfect. So far so good
Yes
Verified Buyer - Submitted 4 years ago
Car
Yes
Verified Buyer - Submitted 4 years ago
Great
Displaying Reviews 1 - 5Back to Top
Will this item fit a 2003 mitsubishi lancer o-z rally edition?
Verified Reply - Solomon
No Azriel, this Autolite Racing Non-Resistor Spark Plug (Part # AR3931) does not fit your 2003 Mitsubishi Lancer OZ Rally. The exact spark plug for your vehicle is currently unavailable online. I would suggest that you visit the nearest Advance Auto Parts store to check the availability of this part.
Will these plugs work with a 1978 mercedes-benz 450sl 4.5
Verified Reply - Solomon
No Mike, this Autolite Racing Non-Resistor Spark Plug (Part # AR3932) does not fit your 1978 Mercedes-Benz 450SL 4.5L. We do have an exact spark plug available online for your vehicle and the part number is AP64. Please enter your vehicle on our website and search for this part to check the fitment.
Do these fit a 2013 VW Passat TDI SE 2.0l turbo?
Verified Reply - Solomon
No COREY, this Autolite Racing Non-Resistor Spark Plug (Part # AR3932) does not fit your 2013 Volkswagen Passat TDI SE 2.0L. The exact spark plugs for your vehicle is currently unavailable online. I would suggest that you visit the nearest Advance Auto Parts store to check the availability of this part.
Can someone confirm that this works on a 2021 Subaru Crosstrek with a 2.5 l engine
Verified Reply - Solomon
No Justin, this Autolite Racing Non-Resistor Spark Plug (Part # AR133) does not fit your 2021 Subaru Crosstrek 2.5L. The exact spark plugs for your vehicle is currently unavailable online. I would suggest that you visit the nearest Advance Auto Parts store to check the availability of this part.
Do these work on a Brz
Verified Reply - Steve
Hi Marvin! To check compatibility, please provide your Subaru BRZ's year and engine size, so I can assist you further.
Displaying Question & Answer 1-5
Feedback
Be The First To Know About Deals And Promotions.
Plus, create an account to receive $5 off of $20 or more.
TOP REPLACEMENT PARTS
ROUTINE MAINTENANCE PARTS
CUSTOMER SUPPORT
ABOUT US
PROFESSIONAL SHOPS