QSM11 Diesel Engine Turbocharger For Excavator R385 - 9 4037707
Diesel Engine
Specification
| Part Name: Engine turbocharger | Serial code: HS77190517324 |
| cylinders numbe: 6 | Type: Diesel engine |
| Application: Construction machinery | Cust: 40337707 |
| Type: Direct injection or Electric injection | Industrial Engine: QSM11 |
| Model: HX55W | Assy: 4037707 |
Description
How does a turbocharger help a small engine?
This kind of power can be easily provided by a downsized engine
with a turbocharger. Hanging a turbo on a small engine allows a
little engine to breathe big. With only 6 to 8 pounds of boost
pressure, a turbo can increase power output 15 to 25% or more over
a naturally aspirated engine.
Turbo Tweaks
Dialing up the boost pressure is a quick and easy way to increase
power in any turbo engine – up to a point. The stock fuel injectors
in many diesel engines can safely handle higher boost pressures but
that’s usually not the case with gasoline engines.
The flow capacity of the stock injectors in a gas engine can
quickly max out if turbo boost is increased more than a few pounds
beyond stock levels. This may cause the fuel mixture to go
dangerously lean, resulting in detonation, melted pistons or a
blown head gasket. To prevent such a disaster from happening, the
flow rate of the injectors have to be matched to the boost pressure
and airflow delivered by the turbo. Consequently, if you want to
dial up the boost pressure for more power, you’re going to need a
set of higher flow injectors.
In gasoline engines, more octane is also needed as boost pressures
go up. The engine’s knock sensor can back off timing and boost
pressure if detonation is detected, but that also kills
performance. Most turbo engines recommend premium fuel because the
higher octane helps the air/fuel mixture resist detonation. Premium
pump gas is usually only available with octane ratings of 91 or 93,
so higher octane racing gas or alcohol (methanol or ethanol) may be
needed if turbo boost pressures are increased beyond stock.
The bottom end of most turbo engines is strong enough to handle a
moderate increase in boost pressure over stock. But for a real
killer street or race engine that’s running lots of boost, stronger
pistons, connecting rods and crankshaft are probably going to be a
must.
