Mazda's All-New CX-9 to Feature New 2.5-liter Direct-Injection Turbocharged Gasoline Engine
19 November 2015 - 9:57PM
JCN Newswire (English)
Mazda Motor Corporation has enhanced its SKYACTIV-G engine
series with the range-topping SKYACTIV-G 2.5T. This 2.5-liter
direct-injection turbocharged gasoline engine powers the all-new
CX-9 midsize three-row crossover SUV that will go on sale starting
from North America in spring 2016.
The SKYACTIV engine series aims to offer customers a combination of
outstanding fuel economy and excellent dynamic performance in
everyday driving situations. Mazda's development philosophy is to
offer this combination across all vehicle lines, using the most
appropriate engine displacement and simplest configuration of
technologies for a given vehicle size. Developed in line with this
philosophy and based on the naturally aspirated SKYACTIV-G 2.5
featured in the Mazda6 (known as Atenza in Japan), SKYACTIV-G 2.5T
is the first turbocharged engine in the SKYACTIV-G series. It
delivers exceptional catalog and real-world fuel economy, excellent
response without turbo lag,(1) and linear and powerful acceleration
in the low- to mid-rpm range where CX-9 drivers spend the vast
majority of their time.(2) Maximum torque is 310 ft-lb, comparable
with a naturally aspirated 4-liter gasoline engine.
Traditionally, turbocharged engines have suffered from poor dynamic
performance at low rpms, including turbo lag, and disappointing
real-world fuel economy. SKYACTIV-G 2.5T overcomes these problems
with the Dynamic Pressure Turbo, the world's first turbocharging
system that can vary the degree of exhaust pulsation depending on
engine speed, and a cooled exhaust gas recirculation (EGR) system
that allows the engine to maintain the ideal air-fuel ratio(3) over
a wider output range.
Mazda will continue to offer all customers driving pleasure and
outstanding environmental performance through its SKYACTIV engines
which aim to achieve the ideal in combustion. The company hopes to
enrich people's lives and become a brand that maintains an
emotional connection with customers.
Features of SKYACTIV-G 2.5T
- High compression ratio
Mazda engineers achieved a compression ratio 10.5:1, one of the
highest for any turbocharged engine with an 89-mm bore size that
can run on regular gasoline.*4
- Dynamic Pressure Turbo
SKYACTIV-G 2.5T is the world's first turbocharged engine with the
ability to change the degree of exhaust pulsation depending on
engine speed. At low rpms (below 1620 rpm), the volume of the
exhaust ports is reduced by closing a series of valves located just
before the turbine that drives the turbocharger. This reduces
interference between exhaust pulses and maximizes the energy of
each pulse to obtain a high turbine driving force. At higher rpms
there is sufficient energy in the exhaust flow and the valves open,
allowing the turbine to be driven by a steady flow of exhaust gases
as in a traditional turbocharger. Whereas existing variable
turbochargers adjust the speed or direction of exhaust gas flowing
into the turbine, Dynamic Pressure Turbo is a unique technology
that varies the degree of exhaust pulsation.
- Cooled Exhaust Gas Recirculation (EGR)
This system takes some of the inert exhaust gas that results from
the combustion process and reduces its temperature by passing it
through a cooler before introducing it back into the engine's air
intake. This lowers the temperature of combustion in the engine,
preventing knocking, expanding the range in which the engine can
maintain the ideal air-fuel ratio and reducing the need to retard
ignition timing.
- Inherits SKYACTIV-G principals of efficient combustion
SKYACTIV-G 2.5T is based on the naturally aspirated SKYACTIV-G 2.5
and features the same bore, stroke and bore pitch. Parts of the
fuel system, such as the fuel pump and fuel injection system are
also shared, helping SKYACTIV-G 2.5T to achieve the highly
efficient combustion for which SKYACTIV-G engines are known.
SKYACTIV-G 2.5T Specifications (Based in-house measurements)
Inline 4-cylinder 2.5-liter direct-injection turbocharged gasoline
engine
Displacement: 2488 cc
Bore x Stoke: 89.0mm x 100.0 mm
Compression Ratio: 10.5:1
Maximum Output (net): 227HP (169kW) /5,000rpm(5)
Maximum torque (net): 310ft-lb (420Nm) /2,000rpm
(1) A delay in acceleration response common in turbocharged engines
due to the time required for the compressor to take effect.
(2) Below 3000 rpm. Based on Mazda's in-house investigations.
(3) The ratio of air to fuel that provides exactly enough oxygen to
burn all of the fuel present. For gasoline the ratio is 14.7:1.
(4) As of November 2015. Based on Mazda's in-house
investigation.
(5) When using AKI 87 regular gasoline. Maximum output with AKI 93
premium gasoline is 250HP (186kW) /5,000rpm.
About Mazda
Mazda Motor Corporation (TSE:7261) started manufacturing tools in
1929 and soon branched out into production of trucks for commercial
use. In the early 1960s, Mazda launched its first passenger car
models and began developing rotary engines. Still headquartered in
Hiroshima in western Japan, Mazda today ranks as one of Japan's
leading automakers, and exports cars to the United States and
Europe for over 30 years. For more information, please visit
www.mazda.com
Source: Mazda
Contact:
Corporate Communications Division
Mazda Motor Corporation, Japan
+81-3-3508-5056 [Tokyo]
+81-82-282-5253 [Hiroshima]
mailto: media@mazda.co.jp
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