TMSN X series: TÜMOSAN’s 300-530 hp military diesels
Quick answer: The TMSN X series is the new-generation turbo diesel engine family TÜMOSAN developed for military vehicles. According to data published in the defense press, the series consists of four main models: the 300 hp TMSN X 5.4, the 360 hp TMSN X 5.5, the 460 hp TMSN X 7.4 and the 530 hp TMSN X 7.5. The engines use a common-rail fuel system and were designed to military standards. The series’ known applications are the Pusat 4×4 tactical vehicle and FNSS’s PARS 6×6 and 8×8 vehicles under the ÖMTTZA program. The SSB 2026 catalog lists the X 5.4, X 5.5, X 7.4 and X 7.4 Marine as separate products.
Model range and technical data
The values below were compiled from DefenceTurk’s powerpack file; the company does not publish official technical datasheets.
| Model | Power | Torque | Known application |
|---|---|---|---|
| TMSN X 5.4 | 300 hp @ 2100 rpm | 1,060 Nm | Pusat integration trials (AA, 2021) |
| TMSN X 5.5 | 360 hp @ 2600 rpm | 1,085 Nm | Pusat 4×4 (open-source datasheet) |
| TMSN X 7.4 | 460 hp @ 2400 rpm | 1,550 Nm | ÖMTTZA-class vehicles (press) |
| TMSN X 7.5 | 530 hp @ 2400 rpm | 1,550 Nm | ÖMTTZA 8×8 class (press) |
According to a 2021 Anadolu Agency report, on-vehicle integration trials of the new-generation 4-cylinder, 310 hp engine were carried out on the Pusat; once the tests were complete, the goal was to offer the engine to the Turkish defense industry for the 4×4 tactical vehicles and tracked armoured vehicles in the Turkish Armed Forces inventory. The small differences in quoted power (300/310 hp) reflect variations between sources.
ÖMTTZA: the series’ first major contract
The X series’ largest known application is the Indigenous Engine Supply Subcontract signed with FNSS on December 25, 2019. The contract covers engine supply for 100 special-purpose tactical wheeled armoured vehicles built for the Land Forces and the Gendarmerie, plus 72 months of integrated logistics support. The defense press reported that these vehicles use TÜMOSAN engines of 450 and 530 hp, values that line up with the X 7.4 and X 7.5. Press coverage described the contract as the first integration of an indigenously developed military diesel into Turkish Armed Forces vehicles at this scale. The contract’s context is set out in the military engine programs file.
Design features
According to company statements, the X series runs on high-pressure common-rail injection, turbocharging and TÜMOSAN’s own Diesel Engine Control Unit (DMKÜ). The engines are qualified for the gradient, dust, temperature and low/high-altitude conditions expected of military vehicles; qualification test details are not public. Paired with TÜMOSAN gearboxes and transfer cases, the series forms the ALP powerpacks; the marine version of the X 7.4 is used in naval applications.
At IDEF’25, Volkan Gün, the company’s group director for technology and engineering, said the engine platforms were developed for emissions compliance and efficiency, and that the modular powerpacks offer integration flexibility across different land and naval platforms.
The competitive landscape
In Turkey’s military diesel field, BMC Power (the BATU family, with a 1,500 hp target for the ALTAY tank) and TEI (aero engines) work in different segments. The X series’ 300-530 hp band corresponds to 4×4-8×8 tactical vehicles, light tracked armoured vehicles and naval platforms. The foreign competitors in this band are manufacturers such as Caterpillar, Cummins and Deutz; Turkish vehicle builders have to date mostly used these foreign engines. The X series’ market case is that it offers a domestic alternative against sanction and export-license risks; the first major program to test that case is the ÖMTTZA.
Electrification roadmap
The X series’ future line does not run on diesel alone. The company paired the diesel-electric architecture with an X series engine in the Pusat Hybrid, and at IDEF’25 it announced a hydrogen fuel cell prototype developed with TENMAK and Gebze Technical University. These two steps can be read as preparation for the demand for silent running and a low heat signature in military vehicles; the series-production timeline for both technologies, however, has not been officially announced. In the short term, the series’ concrete workload is sustaining the ÖMTTZA deliveries and proposing the ALP powerpacks for potential tracked-vehicle modernization programs.
Frequently asked questions
How many models are in the TMSN X series?
Open sources cite four models: the X 5.4 (300 hp), X 5.5 (360 hp), X 7.4 (460 hp) and X 7.5 (530 hp). The SSB catalog also lists the X 7.4 Marine.
Which vehicles use the X series?
The known applications are the Pusat 4×4 and the FNSS PARS 6×6/8×8 vehicles under the ÖMTTZA; according to press reports, engine supply for 100 vehicles is under way.
Is the X series indigenous?
The company states that the engines were developed entirely with its own engineering and domestic resources. No independent local-content audit has been made public.
Does TÜMOSAN have an engine above 530 hp?
Not officially disclosed. The company’s 1,500 hp-class ALTAY powerpack work ended with the contract’s termination in 2017; the top of the current portfolio in open sources is the X 7.5.
Sources and verification note
Power and torque figures come from the defense press; as the company publishes no datasheets, the values should be read as open-source data. Accessed: August 13, 2026.
- https://www.defenceturk.net/tumosanin-guc-grubu-ve-alt-sistem-calismalari
- https://www.aa.com.tr/tr/bilim-teknoloji/turk-savunma-sanayisinde-yerli-motor-icin-geri-sayim/2337517
- https://www.hurriyet.com.tr/teknoloji/ozel-maksatli-taktik-tekerlekli-zirhli-araca-yerli-ve-milli-motor-41406064
- https://www.tumosan.com.tr/tr/haberler/tumosan-idef25te-gucunu-ve-yerli-muhendisligini-sergiledi
- https://www.tumosan.com.tr/tr/haberler/tumosan-saha-expo-2024te-yuksek-performansli-urunleriyle-dikkat-cekti
