Winners

2025 DOTY

HD HYUNDAI INFRACORE DX05 – DX08

Diesel of the Year 2025 celebrates the innovation of a brand that, over a decade ago, introduced the G2 series—compact engines continually updated to meet evolving market demands and increasingly stringent emissions regulations. HD Hyundai Infracore unveiled the DX series, a range of 4- and 6-cylinder engines with a displacement of 1.25 liters per cylinder.

Designed with a future-oriented approach, the DX series boasts optimized combustion chambers, enhanced transient response, and unparalleled application versatility. Key features include Hydraulic Lash Adjusters and multiple PTO configurations. Its compact design ensures seamless integration across diverse machine layouts, while innovations like the two-stage turbocharger and extended maintenance intervals for fuel and oil filters (from 500 to 1,000 hours) underscore Hyundai’s engineering excellence.

Pre-configured for G-Drive power generation applications, the DX series also holds promising potential for marine conversions in the near future. Yet, what truly sets a leader apart in the technology domain is an engineering team adept at rapidly developing engines compatible with alternative fuels, continually optimizing combustion efficiency, and enhancing specific power and torque outputs. This matches the HD Hyundai Infracore profile.

2025 AEA

FPT INDUSTRIAL XCURSOR 13

The FPT Industrial XCURSOR 13 is a 13-liter diesel engine renowned for its versatility and reliability. Capable of handling twin-stage turbocharging and equipped with an ultra-responsive common rail system, this engine has proven its worth across countless applications. From logging millions of miles in long-haul trucks to plowing vast expanses of farmland with open-field tractors, the previous Cursor 13 has been a star performer in stationary, marine, and off-highway applications alike.

XCURSOR 13 incorporates a new valve actuation system designed to maximize braking power, often eliminating the need for an additional retarder in many vehicle applications.

The engine now features an electronically controlled dual-flow ball-bearing turbocharger, optimizing airflow and fuel efficiency. Additionally, the common rail system pressure has been increased from 2,200 to 2,500 bar, and the peak cylinder pressure now reaches an impressive 250 bar. These advancements translate into a 9% reduction in diesel consumption compared to the 2019 model year. The natural gas/biomethane version boasts an even greater improvement, with a 10% reduction in fuel consumption compared to the same baseline. The XCURSOR 13 also paves the way for hydrogen innovation. At the IAA, FPT Industrial showcased a hydrogen-powered 13-liter truck, demonstrating the company’s commitment to sustainable propulsion technologies. The hydrogen variant has been powering a snow groomer, tested on alpine slopes over the past three years.

2023

SCANIA POWER SOLUTIONS NEXT GENERATION DC13

This award is primarily intended to be recognition of Scania’s muscular investment. The Next Generation DC13 is a completely new cylinder block, designed to raise the efficiency bar. Heavy-truck-friendly operation, moved in less than a year to the bustling arena of industrial mobile applications. And not only! We are confident that pleasure craft and power generation will know and appreciate the frugality of an engine that aims to mitigate the impact on CO2 without the need for costly infrastructure investments and regulatory alchemies. The specific curves hold up in comparison with the same size (we have already tested it with a comparison between the 11 liters. Scania’s regeneration plan has in fact provided for a modular declination, scaled down to 5 cylinders). The ascent is promising, to facilitate translation and effort peaks. The configuration, set-up and specific performance are suitable for facing a triple challenge, for the survival of the endothermic from a holistic point of view: homologate to the future Euro 7 and Stage VI parameters (if any); “digest” HVO and biogenic and paraffinic fuels; embrace electrification.

2022

KOHLER KSD 1403TCA

The Jury of the Diesel of the year 2022 awarded the KOHLER KSD 1403TCA. Why?
Because of the vision required to design an engine block in a power range so exposed to the siren song of electrification;
The KSD family allows the integration of the Kohler engines portfolio, which started with the KDI and which, we believe, is not finished here; 
The 120 Nm maximum torque of the KSD 1403TCA (turbocharged with aftercooler) means no need of ATS; 
The common rail with indirect injection allows the pre-chamber to be recovered, and offers an alternative solution to exaggerated injection pressures in the combustion chamber;
Attention to details, as in Best engine machine integration solution.

2021

JOHN DEERE

The John Deere 18.0L engine was awarded with the Diesel of the year 2021. Introduced as a preview at CONEXPO-CON/AGG 2020, the in-line six-cylinder engine was built on the 13.6L engine design. The two models share more or less the same approach and features. For instance, the high-pressure common rail fuel system and series turbochargers, as well as cooled EGR and hydraulic lash adjusters that eliminate the need to manually reset the valve lash.
The decision to award the John Deere 18.0L was not only based on its specific curves, but also on the industrial philosophy that lies behind them. John Deere still believes in the ICE and invests in the efficiency of the Diesel cycle.

2020

FPT INDUSTRIAL F28

The ‘eclectic’ FPT Industrial F28, Diesel of the year 2020, was designed in compliance with the Stage V and Tier 4 Final standards. The F28 engine features a double after-treatment formula. The DOC is coupled with the DPF for the European market, while a ‘DOC-only’ system is fully compliant with the EPA standard. Thanks to its 375 Nm maximum torque, the engine reaches the highest rate provided by the competitors. The specific torque is 133.5 Nm. A particularly innovative feature of the 4-cylinder engine, which makes it truly oriented to sustainability, is the eclectic nature of the F28. The diesel unit was unveiled together with its natural gas twin, in search of modularity.

2019

KUBOTA V5009

V5009, DOTY 2019, is the new Kubota’s top of the range. This displacement is a game changer and it will probably repeat the success that the compact 4-cylinder engine has been enjoying for ten years. The trump card is the very small volume compared to the six cylinders. Power density and displacement/volume ratio played into Kubota’s hands. In the perspective of hybridization the 5 liters is in pole position for some off-road applications powertrains. The evaluation is completed by the sturdy engine block, the optimization of regeneration, the balance between reliability and performance standards, the VGT and the option of the fourth PTO.

2018

DEUTZ TCD 9.0

Doty 2018 saw the (second) winning emergence of Deutz, with the TCD9.0. A 9-litre 4-cylinder engine that sounded unusual, just like the 2.9-litre and 3.6-litre from Deutz, ‘downsizing’ the liter cylinder displacement in terms of spread to mobile applications. 9 liters is a range where Deutz was a pioneer in the German ICE (internal combustion engines) school. Not to forget its dimensions. Compactness was (and still is) the obsession of every Oem, and Deutz was ready to answer the call. The TCD9.0 depth was comparable to that of a 5-liter engine, its length to that of a 6.7 liter engine.

2017

LIEBHERR D9812

The Doty award 2017 was assigned in February, during Samoter (Verona) of that year and it went to the Liebherr D9812. This prize was assigned after checking Liebherr components evolution and after analyzing D98 basic data and the positioning in the free engines market. The final decision was based on its power density and compactness compared to the dimensions, its focus on a peculiar application such as mining, its courage to dare in a range where just a couple of brands were leading and the components program development with a mention for their in-house common rail system.

2016

MAN D3876

The 15.2-liter D3876 was the winner of Doty 2016 and Man new top of range at the time. Man was defenetly crossing the line of pure automotive to meet any market need. What triggered the Doty nomination was its technological flexibility. The secret was double-egr and double boost stage, while in agricultural applications and construction a well-balanced compromise between performance and efficiency was privileged. We also can’t forget the 2,500-bar common rail and the compactness of its engine block with its 1.6 cubic meters volume, that was among the leaders in 15 to 16 L displacement range.

2015

KOHLER KDI 3404

The Doty 2015 went to Kohler 3404 Tcr Scr. This is the engine that made Kohler exceed the threshold of 56 kW, up to a maximum of 100 (73 at maximum torque, that is 500 Nm), that was the right number for a strategic penetration in the off-road sector. Another success factor was in the name: Scr. Not that big surprise, considering the boundaries of Tier 4 final, yet significant nonetheless. The real main ingredients of this formula? Compactness and prospective. The first refers to the 900 mm module for Doc and Dpf. The second one to the return of the Dpf, the first step back then towards Stage V.

2014

FPT CURSOR 16

The name behind Doty 2014 was Fpt Cursor 16. It was at the party with its 16 liters, its 6 cylinders and two different ‘suits’. The common key word for the dimension was ‘Xs’, legacy of the Cursor 13. The winner was indeed the supercharged single stage version, that was ready for Cnh machines. The power range was between 515 to 570 kW in the turbo version, with a torque between 2.990 and 3.220 Nm, that brought Fpt really close to Man engines. Important mentions: both Scr and Doc were present, together with a 2.200 bar common rail, blow by and a never seen before on Fpt engines ball bearing.

2013

MTU 6R 1500

After Kohler’s Kdi won the 2012 edition, this was the big year of Mtu. The name of the winner was R 1600 and it came from the world of automotive. 6-cylinder with an industrial background that had all the reliability so dear to construction applications. The rpm is 1,700, with a piston speed of 9.7 m/s to avoid wear. The three available calibrations (400, 430, 460 kW) can offer more than enough power, with the right torque (2.600, 2.750, 2.900 Nm at just 1.300 rpm). No filter for this engine. The solution was common rail high pressure and integrated Scr. The big surprise was the new turbocompund.

2012

KOHLER KDI 2504

Doty 2012 was the first victory for Kohler, with the second one happening in 2015. The winner was the Kdi 2504TCr that was able to overcome the ‘obstacle’ of Tier 4 Final/Stage IIIB. This 4-cylinder, 2.5-liter engine didn’t need a particulate filter, thus saving space and needing less maintenance interventions. The emissions were managed by Egr and Doc systems and the big innovation was the appearance, for the first time on an industrial Kohler engine, of a common rail (2.000 bar). This led to a consumption reduction up to 10% compared to an engine with indirect injection and Dpf stand alone.

2011

JCB ECOMAX

In 2011 the winner of the Doty award was Jcb Ecomax, that presented itself without an after-treatment system, going against the diffusion, at the time, of complicated and cumbersome engines. The added value of this 4-cylinder was indeed in its simplicity, created to properly fit in with the necessities of the different final users. Jcb was able to find the proper thermodynamic equilibrium in order to realize the right balance for the free market, with a reduction in terms of consumption up to 10%. The beating hearth of this system was the achieved balance within its combustion chamber.

2010

DEUTZ TCD 2.9

2010 was the first victory for Deutz (the second one will come in 2018), that won with the Tcd 2.9 L4. It represented a turning point in the history of the company. The German 4-cylinder engine imposed itself in the mini compact sector, with its 25-56 kW, that was until that time dominated by Japan. It came on the market to get its own ‘slice’ both in the agricultural and the earth movement markets, playing together with the ‘big names’. The concept behind it was maximum reliability to avoid a possible indigestion by the final users on the industrial market.

2009

PERKINS 1206E

At Intermat 2009, the protagonist for the Doty was Perkins 1206E-E70Tta. It was able to reduce the emissions while also keeping high performances. The displacement was increased from the typical 6.6 to 7 liters round. There was also a 2.000 bar common rail made by Denso (instead of Caterpillar) and the combustion cycle was renewed, with a completely different combustion chamber. A lot of research went also on the flexibility of the set-up, with a particular focus on the particulate filter. For the first time in the Perkins family, there was also the blow-by. Overall, consumption was cut by 3%.

2008

FPT INDUSTRIAL F32

2008 was the year of Fpt. The F32 won the Doty 2008, with its 4 cylinders and its 3.2 liters being the best answer on the market to the captive requirements and the right challenger for all the competitors. This super compact engine was a sort of ‘blind jump’ for Fpt in the industrial sector. With its torque going towards 400 Nm it was able to lead the market at the time. The attachment points were the same of the Nef with 3 cylinders, that was much appreciated by the Oems moving towards the 4-cylinder. It also had all the filters mounted on one side of the engine and the standard Egr system.

2007

CUMMINS B3.3

In 2007 the winner of the Doty award was the American Cummins B3.3 compact engine. An American engine with a Japanese touch from Komatsu that was born ready for Stage III. The range of power was between 60 and 63 kW with rpm between 2.200 and 2.600 and it came both in mechanical and electrical versions. For the two mechanical ones the torque at 1.600 rpm was 292 Nm, while for the electric ones it reached up to 371 Nm. These parameters at the time were the top of the market of the 4-cylinder engines and Cummins (together with Komatsu) was able to leave behind all the other brands in that period.

2006

JOHN DEERE PTPS 6090

Back in what seems to be half a century ago even if it was only 2006, John Deere PowerTech Plus 6090 was at the top of the market. This was an innovation born from the results obtained with the 6068, but with 10% more displacement and other significant improvements. The barrel was more ‘generous’ and allowed for a better thermodynamic balance, with a crucial benefit in terms of emissions. It also reached ‘new’ power levels (280 and 298 kW) to get closer to its big brother, the 6135. The Egr was the innovative answer to Stage III regulation back then, a standard that now sounds quite old.