AUTOLITE part description

Product Description

Autolite AR51 High Performance Racing Non-Resistor Spark Plug

Features & Benefits

  • Yttrium-Enhanced Alloy enables up to 8% reduction in sidewire temperature for colder heat ranges designed to enable performance modifications and handle intense conditions.*
  • Engineered with a cut-back ground electrode that delivers optimal ignitability of the flame kernel and better heat transfer, leading to quicker starts.
  • Cut back ground electrode for better ignitability of the flame kernel
  • 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.
  • Anti-corrosive nickel plating to prevent rusting better than black oxide
  • 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.

Product Attributes

Resistance 1 82
Ground Electrode Tip Design Standard
Ground Electrode Core Material Nickel
Electrical Terminal Type Non-Removable Nut
Center Electrode Core Material Copper
Center Electrode Tip Material Nickel
Pre-Gap Size 0.025 IN
Ground Electrode Quantity 1
Hex Size 21 MM
Seat Type Flat
Reach 0.75 IN
Thread Diameter 14 MM
Insulator Material Ceramic
Resistor Type No
Ground Electrode Tip Material Nickel
9608 Standard
9805 Mid Projection
Washer Included Yes
Grade Type Performance
Hex Size 13/16 IN
Manufacturer Heat Range 12
9459 Yes
9507 Hex
9746 No
Reach 19.049999999999997 MM
Pre-Gap Size 0.635 MM

Additional Information

Country of Origin (Primary) MX
Harmonized Tariff Code (Schedule B) 8511100000
Warranty Special No Warranty
Warranty Special UOM TX
Harmonized Tariff Code (HTS) 8511100000
UPC 00009100017727
UNSPSC 26101732

Part Interchanges

Fits Vehicles

  • Fiat 125 (1961-1967)
  • Alfa Romeo Giulietta (1959-1961)
  • Ferrari 250 LM (1964-1965)
  • Ferrari 400 Superamerica (1960-1966)
  • Ferrari 275 LM (1964-1965)
  • Ferrari 275 GTS (1964-1968)
  • Porsche Carrera (1960-1964)
  • Fiat 1500 (1965-1967)
  • Fiat 124 (1970-1973)
  • Ferrari 365 GTS/4 (1970-1974)
  • Ferrari 365 GTS (1968-1970)
  • Ferrari 365 GTC/4 (1971-1972)
  • Ferrari 330 GTC (1966-1968)
  • Ferrari 365 GTC (1968-1970)
  • Ferrari 365 GTB/4 (1968-1974)
  • Ferrari 365 GT4 BB (1974)
  • Ferrari 365 GT (1967-1971)
  • Ferrari 330 GTS (1966-1968)
  • Ferrari 330 GT (1964-1968)
  • Ferrari 275 GTB (1964-1968)
  • Ferrari 275 GT (1968)
  • Alfa Romeo Duetto 1600 (1967)
  • Alfa Romeo Giulia Sprint (1963-1964, 1967-1968)
  • Ferrari 365 GT4 (1972-1976)
  • Porsche 911 (1965, 1982-1989, 1991-1992)

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