X25XE
From Chevy Wiki
| Automotive industry | GM Europe |
|---|---|
| Type | V6 engine Petrol engine |
| Predecessor | C25XE |
| Successor | Y26SE |
| Bore | 81.6 mm (3.213 in) |
| Stroke | 79.6 mm (3.134 in) |
| Engine displacement | 2.5 L (2498 cc, 152.4 cu in) |
| Block alloy | Cast iron |
| Head alloy | Aluminium alloy |
| Valvetrain | 2x DOHC |
| Fuel type | Gasoline |
| Oil system | Wet sump |
| Engine cooling | Water/Antifreeze |
| Power output | 125 kilowatts (168 hp) |
| Torque output | 227 N·m (167 lb·ft) |
| Compression ratio | 10.8:1 |
| Automotive industry | GM Europe |
|---|---|
| Type | V6 engine Petrol engine |
| Successor | Y32SE |
| Bore | 86 mm (3.386 in) |
| Stroke | 85 mm (3.346 in) |
| Engine displacement | 3 L (2960 cc, 180.6 cu in) |
| Block alloy | Cast iron |
| Head alloy | Aluminium alloy |
| Valvetrain | 2x DOHC |
| Fuel type | Gasoline |
| Oil system | Wet sump |
| Engine cooling | Water/Antifreeze |
| Power output | 155 kilowatts (208 hp) |
| Torque output | 270 N·m (199 lb·ft) |
| Compression ratio | 10.8:1 |
The X25XE is a GM Europe (GM) Petrol engine. It is a 2498 cc (2.5L) 24 valve, Overhead camshaft V6 engine, producing, in standard form 125 kilowatts (168 hp) (170 PS).
The breakdown of the engine name [1] is as follows:
X - Exhaust Emissions Level: 94/12/EC, stage 2
25 - 2.5 Litre displacement
X - Compression Ratio - 10.0-11.5:1
E - Mixture System - Injection
In the early 1990s, GM identified the need for a modern, lightweight and compact power plant to replace its ageing Straight-6 engine range. This Internal combustion engine needed to be compact, to allow its use in Front-wheel drive applications, as well as Rear-wheel drive Automobile.
The first version arrived in the Opel Vectra / Vauxhall Cavalier (both codenamed "Vectra-A") and Opel Calibra in the C25XE form, and was later followed by the X25XE in the Opel Omega and Vectra-B, with the Omega gaining a variant with increased displacement in the form of the X30XE.
This power plant was a modern Multi-valve, quad cam arrangement, with an oil to water Heat exchanger mounted within the V of the Cylinder block. The Cylinder head were constructed from aluminium alloy, and the block from Cast iron.
An unusual feature of the engine was its 54 degree Cylinder (engine) angle, as opposed to the more conventional 60 degree setup used on many V6 units, this added to the setups' compactness.
A Robert Bosch GmbH Motronic engine management system is used to control the unit, with full sequential Fuel injection, knock control on each bank, Distributor Ignition system (DIS), and closed loop lambda control.
Technical data
| Engine | X25XE |
|---|---|
| configuration | V6 engine Petrol engine |
| displacement (cc) | 2498 |
| bore (mm) | 81.6 mm (3.213 in) |
| stroke (mm) | 79.6 mm (3.134 in) |
| max power kW @rpm | 125 kilowatts (168 hp) @ 6000 |
| max torque Nm @rpm | 227 N·m (167 lb·ft) @ 3200 |
| compression ratio | 10.8:1 |
| engine management | Robert Bosch GmbH Motronic M2.8.1 then M2.8.3 in 2000 approx |
| idle speed | 450-1030 |
| max rpm | 6600 |
| firing order | 1-2-3-4-5-6 |
| Engine | X30XE |
|---|---|
| configuration | V6 engine Petrol engine |
| displacement (cc) | 2960 |
| bore (mm) | 86 mm (3.386 in) |
| stroke (mm) | 85 mm (3.346 in) |
| max power kW @rpm | 155 kilowatts (208 hp) @ 6000 |
| max torque Nm @rpm | 270 N·m (199 lb·ft) @ 3400 |
| compression ratio | 10.8:1 |
| engine management | Robert Bosch GmbH Motronic M2.8.1 then M2.8.3 in 2000 approx |
| idle speed | 450-1030 |
| max rpm | 6600 |
| firing order | 1-2-3-4-5-6 |
The "X" variant of the engine had the addition of secondary air injection, and EGR to meet later and more stringent emission requirements.
The air injection blew air via a large blower into the Exhaust manifold to ignite un-burnt fuel in the downpipes during the engine warm up phase, in order to get the Catalytic converter up to temperature faster. The EGR setup re-cycled exhaust gases (which are in theory inert to the combustion cycle) in order to reduce the production of NOx.
History
Minor changes were made to the unit during its production, including an uprated Oil pump (internal combustion engine) around mid 1997, with the addition of larger oilways in the head machining (T-Vents), and modified Tappet to reduce top-end valve noise, at which point the Timing belt arrangement also changed with the lower idler moving.
Around 1998, the spin-on metal canister Filter (oil) was changed to a disposable paper element.
2000 saw a complete revision of the power plant in order to meet increasing emission requirements, with the 2.5 and 3.0 being replaced by lower compression 2.6 (Y26SE) and 3.2 (Y32SE) units.
These later power plants had a revised Engine management system setup, which utilised quad lambda sensor control, coil per plug ignition system and Drive by wire throttles. The 3.2 also received a stronger steel Crankshaft. As a result of these changes the EGR and secondary air injection system were removed.
