## GM Will Apply Bin 5 V-8 Diesel in MY 2010 Silverado and Sierra Pickups

##### 05 May 2008

General Motors will introduce its new Tier 2 Bin 5 compliant 4.5L V-8 Duramax turbo-diesel (earlier post), in Chevrolet Silverado and GMC Sierra light duty trucks in the 2010 model year.

The new dual-overhead cam, four-valve V-8 diesel engine is expected to deliver more than 310 horsepower (231 kW) and 520 lb-ft of torque (705 Nm), while delivering a 25% engine fuel efficiency improvement versus comparable gasoline engines.

The new V-8 diesel will be GM’s first engine to use a selective catalytic reduction (SCR) NOx after-treatment system with a diesel particulate filter to help achieve Tier 2 Bin 5 and LEV 2 emissions, making it compliant in all 50 states.

Technology in the new 4.5L diesel V-8 includes lightweight aluminum cylinder heads with integrated manifolding; a variable-vane turbocharger with intercooling; a compacted graphite iron (CGI) cylinder block for a stronger and lighter base engine (compared to lower-strength aluminum or heavier grey cast iron); and a fracture-split main bearing cap system. GM has applied for patents on a number of these features and expects to have several patents granted before the engine launches.

Compared to typical production diesel engines, GM’s new 4.5L V-8 turbo-diesel innovatively reverses the flow of air and exhaust gases entering and exiting the cylinder heads. Air enters the engine through ports in the top portion of each cylinder head. Exhaust gases exit inward between the cylinder heads and directly into a turbocharger.

An electronically controlled, 29,000-psi (2,000 bar) common-rail fuel system is also used on the engine. It has the ability to inject fuel five times per combustion event, reducing noise and emissions while enhancing fuel economy.

okay GM, now put it in an SUV and start work on the 2.25L in line 4.

Come on, try hard, I know it is difficult for you to respond to $3 gas,$4 gas, and \$6 gas is totally incomprehensible, but just trust what your market share is telling you, i promise it will work out if you do!

The New Diesel you are talking about is the LMK 4.5L V8 Duramax Turbo Diesel.

It has many unique features including a 72* block versus the standard 90* and reversed cylinder heads. The exhaust flows into the valley now where the intake resides on most Vee motors. This allows the oxidation catalyst to be bolted directly to the turbo sothat it heats up quicker and buirns of soot sooner.

This motor also uses the SCR you speak of which helps reduce emissions soubstantially but also requires you to fill up an on board urea tank from time to time.

For those who dont know Urea is the fertilizer that farmers put on fields. It reacts with the exhaust to form harmless nitrogen.

It will not go into the trucks first actually.

As a matter of fact ithe Hummer will be the first vehicle to reciev this motor as long as Gm does not sell the line. Then the big SUVs will get it and then the half ton pickups.

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