Dohc Main Rod

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Dohc Main Rod
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A high performance luxury sport automobile, the 2009 Audi S8 brings extraordinary performance at lower cost compared to others in its class. The Audi S8 features a Lamborghini-derived aluminum engine with V10 Dual Overhead Cam (DOHC) gasoline engine with an ample 5.2 Liter displacement. The regulated high pressure and low pressure fuel system works with Audi's FSI gasoline direct injection to maximize fuel economy and to reduce emissions. Through gasoline direct, the S8 can change the air to fuel ratio to vary fuel consumption from ultra lean to full power depending on the load (whether light or heavy) and driver's rate of acceleration. This ensures saves fuel while providing power on demand.

Virtually identical to the 2008 model, the 2009 S8 features electronic engine management that provides features such as single rod ignition coils, master/slave control units, lambda control for selected cylinders, knock control, solid state voltage distribution and a quick start secondary air system. Electronic Throttle Control (ETC, or drive by wire) is used by the S8 to ensure superb performance regardless of ambient and engine temperatures, altitude and load.

Ensuring the availability of maximum power at all times, the S8's variable valve timing engine adjusts timing on the fly while the engine is running. At 7,000 rpm, the engine puts out 450 horsepower. At 3,500, the engine turns with 398 foot pounds of torque. While tuned to the luxury car application, this engine can still accelerate the S8 from 0 mph to 60 mph in less than 6 seconds.

Ronald W Tanner is a contributing writer at SWEngines.com. He writes about Audi S8 Engine and other industry specific topics.

2011 Subaru Boxer Engine

This overall renewal is the first in 21 years, since the second generation boxer engine was introduced in the first Legacy models in 1989.

This new-generation Horizontally-Opposed 4 cylinder gasoline engine, the third generation Subaru boxer engine, showcases Subaru's latest engineering research and development. It offers a new performance level by further refining Subaru's unique expertise in Boxer engine technology. The engine was entirely renewed, starting from the basic structure, while all the advantages of the horizontally-opposed layout were maintained: lightweight, compact, low center of gravity, and superior vibration balance. New-generation improvements include advances in both environmental friendliness, such as an approximately 10% improvement in fuel efficiency, and driving performance for smooth acceleration in all speed ranges. Furthermore, FHI designed the new engine with consideration of the technology's expandability and potential capability to receive further upgrades meeting future environmental measures.

FHI built a new factory at the Gunma Oizumi Plant exclusively for the production of this new-generation boxer engine. This new plant offers state-of-the-art production facilities that make full use of FHI's engine manufacturing know-how developed to date, as well as a highly efficient production system delivering products meeting the highest quality standards.

* Boxer engine : Also known as a Horizontally-Opposed engine. In this design, the pistons are arranged symmetrically left and right along the crankshaft. When the pistons move, they resemble the punches thrown by boxers, thus resulting in this popular name.

Major Features of the New-generation Subaru Boxer engine]
The overall structure of this engine has been totally renewed,
by reviewing the bore and stroke for the basic structure to allow a longer stroke than current engines. It is designed to achieve high efficiency in basic performance, allowing the smooth and sporty rotational properties for which Horizontally-Opposed engines are known, while also making improvements in practical torque and environmental friendliness. This engine is available with 2,500 cc or 2,000 cc displacement, both with 4 cylinders. These models will now be positioned as our main engines.

The bore and stroke, the basic structure of this engine, have been reviewed to achieve a compact combustion chamber as well as a long stroke, which was difficult previously due to chassis mounting conditions in boxer gasoline engines. This allows high combustion efficiency, and generates a sufficient mid-low speed torque with improved fuel efficiency and practicality.

Improved fuel efficiency has been achieved through optimization of intake port configuration and the addition of partitions inside ports, the use of TGV (Tumble Generated Valve), and the use of an EGR (Exhaust Gas Recirculation) cooler.

AVCS (Active Valve Control System) is used on both intake and exhaust valves. For the intake side in particular, an intermediate lock system allows valve timing to be advanced or delayed for precise control over intake and exhaust valve timing, allowing maximum engine performance in output, fuel efficiency, and exhaust emission.

The use of lightweight primary moving parts, such as pistons and connecting rods, and a highly efficient and compact oil pump provides an approximately 30% reduction in friction loss and improves fuel efficiency and revolution response.

Cooling has been optimized by using separate engine cooling circuitry for the block and the head, resulting in improvements in fuel efficiency and output characteristics.

[Engine Outline*1]
New Boxer engine Current engine
Engine type Horizontally-Opposed
4 cylinder DOHC Horizontally-Opposed
4 cylinder DOHC
Displacement 1,995cc 1,994cc
Compression ratio 10.5 10.2
Bore x Stroke 84 x 90mm 92 x 75mm
Max. output 109kW 109kW
Max. torque 196Nm 191Nm

*1 Compared to a 2,000 cc naturally-aspirated engine
*2 Changes with regard to domestic specifications
[Major Changes and Results*2]
Items Output Fuel
efficiency Exhaust emissions
Longer stroke O O O
Compact combustion chamber O O O
Lighter parts in moving parts O
Cooled EGR system O O
Intake/Exhaust AVCS O O O
TGV O O
Compact oil pump O

Advantages of horizontally opposed engines (Reference)

[Kinematic performance]

Compared to in-line engine and V-type engine, the height of horizontally opposed engine is lowered, allowing a lower center of gravity for the entire vehicle.

The lightweight, compact design and symmetrical layout allow a smaller yaw moment of inertia.

[Reduced vibration]

The pistons on the left and right sides move in symmetrical opposition, cancelling out any vibration. This allows a smooth revolution feeling with little vibration. In addition, since no balancer shaft is required, the weight increase of the engine is minimized.

[Collision safety]

Since the engine is sitting low, strong forces from the front such as a head-on collision will result in the engine being driven underneath the car. As a result, there is a reduced risk of the engine being forced into the cabin and injuring passengers.
Since the engine is sitting low, there is ample space between the engine and the hood. This space will absorb some of the force in the event of a collision, reducing injury to pedestrians.

FHI is fully committed to develop new products on the theme of integrating enjoyable and reliable driving with environmentally friendly solutions. This same theme applies to this new-generation boxer engine, which will be positioned as a main engine and the starting point of its future power unit strategy. Starting with the Forester, the new engine will be deployed in other Subaru products in the future.

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geo storm ticks?

we bought a 1990 geo storm gsi 1.6L DOHC from a neighbor of ours.... it ticked really loud from the time we bought it over a year ago.... its not a bunch of ticks, it changes with engine speed... but a constant and steady tick tick tick tick tick.. i was told it was the valve train, we had a complete head job done it new valves, seals,lifters. and new head gasket set..... upon reinstalling the sound has not changed nor gone.... when you rev the engine the ticking kinda fades with the engine noise but returns very loud at idle.....ive head rod bearings and main bearings before and this doesnt seem like that..... is a wrist pin possible.... anyone know if this uses floating wrist pins or are they pressed??? thanks

I am pretty sure that the wrist pins are pressed in, but not 100%. I remember with my 93 geo storm GSI that I also had a ticking noise. It turned out to be the injectors that where clicking. It happened to a few guys who had the 1.8L DOHC. But I don't know if that is your problem. You might want to try out WWW.ISUZONE.ORG or WWW.STORMOWNERS.COM

They are forums for isuzu impulse/geo storm. Contrary to what anyone says the motors for the geo storm / isuzu impulse where made by isuzu. I recomend going with the first website as they seem to be a bit more friendly in my experience.

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