Background On Tldi; Two-Stroke Low-Pressure Direct Injection (Tldi); Air-Assisted Low-Pressure Direct Injection - TOHATSU TLDI 40 Service Manual

3. Background on TLDI

The abbreviation TLDI stands for Two-stroke Low-pressure Direct Injection and
is the name Tohatsu applies to direct fuel-injection system engines.

1. Two-Stroke Low-Pressure Direct Injection (TLDI)

TLDI is the name Tohatsu uses for two-stroke engines that utilize the air-assisted, low-pressure direct
injection system.
The air-assisted, low-pressure direct injection system has been combined with the L-CDI or (Long-arc
duration CDI ignition system and Engine Control Unit (ECU), which performs precision control of fuel
mixture, injection timing and ignition timing to maximize combustion efficiency in the TLDI-50 engine.
The result is better fuel economy, smaller size and greater power in a two-stroke engine.

2. Air-Assisted Low-Pressure Direct Injection

With TLDI, the air-assisted, low-pressure direct injection process involves using an air compressor to
pressurize the fuel supplied by the fuel pump to in order to propel or inject it directly into combustion
chambers in the form of a finely atomized mixture to achieve maximum combustion efficiency.
Atomized fuel mixture
Air
CARBURETOR
Pressurized fuel
Exhaust
r
Gasoline + Oil
Compressed air
q
1-6
w
e
Exhaust
Air
Oil
q Fuel injector
Air
w Air injector
e Spark plug
r Carburetor
TLDI