Kategoriarkiv: Duramax

GM och deras hyllvärmare Duramax 4500

Det kommer fler och fler indikationer på att den av GM malpåselagda Duramax 4500 med block i CGI är på väg att återgå och kommer i produktion.

Image: DURAMAX-V8-1.jpg

Mortimer skriver nu:

But the bigger question is: Will GM revive its ideas for a 4.5-liter Duramax 72-degree V-8 diesel (code-named LMK) in its full-size half ton trucks? This project hit the rocks amidst The General’s financial woes. The project was cancelled in 2009, and it was reported earlier this year that GM vice president of global powertrain, Steve Kiefer, had made various comments to the effect that GM could “dust off” the 4.5L diesel engine.



Tidigare i år har ledande personer uttalat att GM kommer att satsa mer på diesel framöver.





This engine is not yet commercially launched although it was touted in the automobile press as one of the most important new engine concepts for small trucks and SUVs by finally delivering a capable diesel engine in a compact enough package. The engine project is current on indefinite hold by GM. General Motors planned a 4.5-litre 72-degree[9] V8 for light-duty applications which would be built at GM’s powertrain facility in Tonawanda, New York after 2009. Designed to fit in the same space as a Chevrolet Small-Block engine, it is expected to produce over 310 bhp (230 kW) and 520 lb·ft (705 N·m) of torque. It added urea injection, 29,000-psi (2,000 bar) piezo-electric common-rail fuel system over previous Duramax architecture.[10]

It was initially targeted for the Chevy Silverado/GMC Sierra and Hummer H2.[11] Unlike previous Duramax engines, the 4.5-liter is planned to be designed and built entirely by GM, without assistance from Isuzu.[12]

As of March 2009, a GM spokesperson stated the engine project has been put on an ”indefinite hold” due to current economic conditions



Tonawanda stod helt klart 2009 att börja producera denna motorn med Sintercast CGI i blocket då den ströks och man tryckte inte på knappen till produktion. Sintercast fick stryka 500.000 årliga ekvivalenter ur orderboken. Detta blev början till kursfallet från ca 170 kr till ca 35 kr.

Om den kommer igen så är det givetvis en succé för Sintercast.


”Technical highlights of the engine include aluminum cylinder heads with integrated manifolding; a variable-vane turbocharger with intercooling; a Compacted Graphite Iron (CGI) block for a stronger and lighter engine base (compared to lower-strength aluminum or heavier grey cast iron)”

2010 var man på gång





GM kommer också med mera diesel i USA


GM plans to launch more diesel vehicles in U.S.


Light-duty versions of GM’s full-sized trucks, the Chevrolet Silverado and GMC Sierra, are two likely candidates for a diesel engine. Chrysler’s Ram 1500 already offers a diesel engine and the highest fuel-economy rating ever given to a full-sized truck, 28 mpg on the highway.

Ford will launch the aluminum-bodied 2015 F-150 late this year and will offer an SFE or Super Fuel Economy model.

Kiefer said: “We will continue to introduce more diesels as appropriate and as the market accepts them.”




How GM missed the truck fuel economy race, and how it will return




Six years ago, GM was installing production machinery in its Tonowanda, N.Y., engine plant to build an advanced, 4.5-liter Duramax diesel V-8 for the light duty Chevrolet Silverado and GMC Sierra.

But then GM ran out of money. And the company’s bankruptcy killed that engine.

Tillägg. Och detta fick en allvarlig inverkan på Sintercast som skulle stå för CGI-blocken till den motorn. De fick snöpligen stryka den stora produktionen ur orderboken. Det var helt färdigt för produktion i Tonawadafabriken. 

Slutet gott allting gott:

But Steve Kiefer, GM’s vice president of global powertrain, today at the 2014 Management Briefing Seminars gave a bullish presentation about GM’s future diesel plans.

Listening to Kiefer’s enthusiasm for diesels, you get the feeling that GM’s bad luck is about to change — and it won’t be by accident.