Det verkar vara dags
Först kom denna hint om att de satsade på en ny motor
6 February 2014
DMAX Ltd.—a GM-Isuzu joint venture—will invest $60 million in the Ohio-based Duramax diesel engine plant to make design changes that meet future emission requirements.
Established in 1998, DMAX has produced almost 1.6 million engines since opening in 2000. GM owns 60% and Isuzu owns 40% of the venture that makes the Duramax diesel for heavy-duty trucks. The investment retains approximately 500 jobs at the engine plant.
https://www.dieselnet.com/news/2014/02gm.php
6.6L DURAMAX LML SPECS
| Engine: | 6.6L Duramax LML, 90 degree V8 diesel |
| Assembly Location: | DMAX assembly plant in Moraine, Ohio |
| Years Produced: | 2011 – current |
| VIN Code: | 8 (8th digit of VIN) |
| Displacement: | 403 cubic inches, 6.6 liters |
| Head/Block Material: | Aluminum cylinder heads, cast iron engine block |
| Compression Ratio: | 16.0 : 1 |
| Firing Order: | 1-2-7-8-4-5-6-3 |
| Bore: | 4.06″ (103 mm) |
| Stroke: | 3.90″ (99 mm) |
| Aspiration: | Turbocharged & intercooled – Garrett variable vane (VVT), variable geometry turbocharger (VGT) with air-to-air intercooler |
| Injection: | Direct injection, 2000 bar (~30,000 psi) Bosch high pressure common rail w/ CP4 injection pump and piezo injectors |
| Valvetrain: | OHV (overhead valve), 4 valves per cylinder, mechanical roller lifters |
| Oil Capacity: | 10 quarts w/ filter (9.5 liters) |
| Fuel Compatibility: | Ultra low sulfur diesel (ULSD) or max B20 biodiesel blend |
| Max Shift RPM: | 3,000 rpm |
| Peak Horsepower: | 397 hp @ 3,000 rpm |
| Peak Torque: | 765 lb-ft @ 1,600 rpm |
http://www.tfltruck.com/2015/06/2017-gmc-sierra-3500-hd-diesel-prototype-spied-video/
We have not been able to confirm whether or not the new engine will feature an aluminum block or CGI (Compacted Graphite Iron). The aluminum block is unlikely if they opt for steel pistons.
Duramax aficionados are also waiting to find out whether the new model’s engine blocks will be made of aluminum – to reduce weight for improved fuel economy – or compacted graphite iron (CGI). According to automotive engineers, engines equipped with steel pistons would require CGI engine blocks, for durability purposes.
se http://www.wian.se/2015/06/stalkolvar-kommer-nu-pa-bred-front/
Just stålkolvar jämnar vägen för en bred övergång till CGI även i bensinare. CGI passar mycket bättre rent termiskt med stålkolvar.
From what we have learned from a recent oil presentation from Shell, is that new engines are going to be running hotter in hopes of yeilding better economy. The increased heat, would probably be why DMAX is interested in steel pistons
Chevrolet Silverado
Rumor has it that GM has a significant update in the works for the Duramax to debut soon, so stay tuned, as it is doubtful GM will remain content with being third best.
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The big news for the HD models is an updated Duramax diesel engine. The current LML Duramax makes 397 hp and 765 lb-ft of torque. Respectable numbers in their own right but significantly lower than the current power leader, Ford’s 6.7L Power Stroke with 440 hp and 860 lb-ft of torque. The revised Duramax, which is expected to retain its 6.6L displacement, is rumored to produce as much as 450 hp and 850 lb-ft of torque. (nu är det 397 hp och 765 lb/ft)
Jag har fått grundtipset ifrån en läsare av mina mailutskick som mailat mig. Själv har jag inte den riktiga glöden och tiden för närvarande att sitta så mycket vid datorn. Det går i omgångar.
Ju mer jag analyserade grundtipset. ju mer övertygad blev jag dock om att de som skrev om ett materialbyte kunde ha rätt. Ifrån att Duramax 6600 kom 2001 har den genomgått fem större uppgraderingar och gått ifrån 235-397 hkr och ifrån 500-765 lb/ft med samma gråjärnsblock. De står antagligen vid ”världs ände” materialmässigt sett.
Då kan man inte plötsligen höja vridet med ca 20 % utan att ha ett CGI-block att luta sig emot.
De talar ju också om att ” GM has a significant update” in the works for the Duramax …..
http://duramaxhub.com/duramax-timeline.html
Tänk om vi även hade fått en återintroduktion av den redan klara Duramax 4500 med block i CGI som togs bort och lades på, hyllan 2008. Detta är en färsk spekulation om att den återkommer
The “original” Duramax small-block V-8 was touted as having aluminum heads and integrated exhaust manifolds to keep its size the same as that of the then 5.7L gas V-8.
The 2017 variant, if there is one, would most likely feature the new diesel-era composite graphite block (CGI) and aluminum heads, a variable-vane turbo with direct-injection, along with other technology that’s evolved with it’s 6.6L big brother.
http://www.hardworkingtrucks.com/future-tech-gm-light-duty-duramax/
Redan vid en övergång till CGI-block i Duramax 6600 tror jag vi har en nätt liten produktion på 300-400.000 ekv eller 15-20.000 ton per år. Det kommer att bli ett gott tillskott om ca ett år. Kommer även den lilla V8an på 4,5 liter kan vi tala om lika mycket till.
NYTT den 30 juni
General Motors Believed Ready to Announce Commercial-Truck Venture With Navistar
Detta kan innebära att Duramax 6600 kommer i ännu fler lastbilar.