Automotive abbreviations can be confusing at times. Many times acronyms and abbreviations are used when buying an engine.
Don’t know your SOHC from your socks? Here is a quick lookup and reference guide for all those acronyms and abbreviations that you’ll find around the car industry.
Some of these will be very important to know when you’re buying a replacement engine for your vehicle.
BBL: One barrel carburetor
2BBL: Two barrel carburetor
4BBL: Four barrel carburetor
AWD: All Wheel Drive
FWD: Front Wheel Drive
RWD: Rear Wheel Drive
2WD: Two wheel drive
4WD: Four wheel drive
A.I.R.: Air Injection Reactor
A/T: Automatic Transmission
M/T: Manual Transmission
S/T: Standard Transmission
AFM: Active Fuel Management (formerly known as displacement on demand (DoD))
BDR: Bolt down rocker (non adjustable)
CC: Cubic Centemeters
C.I.D.: Cubic Inch Displacement
Ecotech: Emissions Control Optimization TECHnology
MD: Medium Duty
HD: Heavy Duty
HI PERF: High Performance
OEM: Original Equipment Manufacture
RAM: Ram Air Manifold
V.I.N.: Vehicle Identification Number
A/C: Air Conditioning
NAT. GAS: Natural Gas
CNG: Compressed Natural Gas
LPG: Liquid Propane Gas
CAT CONV: Catalytic Converter
MLS: Multiple Layers of Stainless Steel
- E.G.R.: Exhaust Gas Recirculation
- NGC: Next Generation Controllers
- JTEC: Jeep Truck Engine Controller
- SBEC: Single Board Engine Controller
- VTEC: Variable (valve) Timing Electronic Control
- VVT: Variable Valve Timing
- ECM: Engine Control Module
- HO: High Output
- SHO: Super High Output
- HP: Horse Power
- FI: Fuel Injection
- CFI: Central Fuel Injection
- MFI: Multi Port Fuel Injection
- SPI: Sequential Port Injection
- DEFI: Digital Electronic Fuel Injection
- EFI: Electronic Fuel Injection
- SFI: Sequential Fuel Injection
- TBI: Throttle Body Injection
- OHC: Overhead Cam
- OHV: Overhead valve
- SOHC: Single Overhead Cam
- DOHC: Dual Overhead Cam
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