CVRDE – 2000 bhp engine and why?
An Alpha Defense Exclusive
We all know that CVRDE has designed a series of diesel engines for future tanks and other combat vehicle platforms. These engines range from producing 600 bhp to 1500 bhp. This also includes the upgraded T-72 engine which was uprated to produce 1000 bhp. The flagship 1500 bhp engine is supposed to make its way into Arjun MK2 and we have extensively covered the technologies that were involved in that engine in an article. I am Bhagavan Hindustani from Alpha Defense and now coming back to today’s article, we will try to know about the 2000 bhp engine that CVRDE supposedly is going to make for future systems which go beyond Arjun MK2. In this article, we will discuss the possible ways CVRDE can build the 2000 bhp engine and discuss the various technologies that can be used by CVRDE. Please remember that this article is based on the limited information available in the public domain. Though it’s clear that CVRDE is working on a 2000 bhp diesel engine.
This could be :
- An altogether new engine (or)
- Turbo charged flagship 1500 HP engine to deliver 2000 HP.
In the beginning
News about the next generation diesel engines that CVRDE is making first emerged in 2017 from a bulletin that DRDO published. A brief comment was made about 1500 and 2000 bhp engines too. According to that bulletin, the 2000 bhp engine was conceived in 2005 and CVRDE was committed in setting up test facilities for the 1500 and 2000 bhp engines. These test facilities also included equipment for testing the fuel injection pumps too. The equipment installed was HA 4500.
In order to make the 2000 bhp engine, CVRDE can actually take the 1500 bhp engine and boost it to produce 2000 bhp via a series of turbo charger technologies. As we have discussed about the technologies that were used in 1500 bhp engine, we will stick to the possible technologies that CVRDE can use to make the 2000 bhp engine in this article.
Recap of CVRDE 1500 bhp engine
It’s known knowledge that the 1500 bhp engine that CVRDE made uses a turbo-charger which was designed, developed, and manufactured by GTRE. The timeline around this turbocharger suggests it will be delivered to CVRDE by year-end. This is a twin-scroll turbocharger that is used to reduce the lag in the lower RPM range.
The above picture represents the exploded view of the turbo charger developed by GTRE. This turbo specially is designed for 600 (lower boost pressure mode) and 1500 bhp (higher boost pressure mode) engine and notice how the turbine housing has two different inlets (top left corner picture).
In a twin scroll turbo charger, the exhaust gas inlet will be divided in to two separate inlets to the turbine housing. The exhaust runners from the outer most cylinders are connected to one inlet and the exhaust runners from the inner most cylinders are connected to another inlet. Exhaust gases from the outer most runners are directed to the inside edge of the blades and exhaust gases from the outer most runners are directed to the inner edge of the turbine blades. This method of separating the inner and outer exhaust pulses helps in reducing the turbo lag. This also helps in maintaining good boost pressure throughout the rpm range. The numbering of the cylinders depends on the organisation and there is no actual rule for numbering the cylinders in a particular order. But this cylinder numbering is the basis for calculating the ignition timing and inlet – outlet vale opening timings so this cylinder numbering will be done first and then the timings and outlet runners will be designed accordingly.
So what are the options that CVRDE have currently to make an engine which generates 2000 bhp? There are multiple options available for CVRDE to make a 2000 bhp engine.
1) Should have designed a new engine in parallel to the 1500 bhp engine.
2) Increase the boost of current turbo charger to produce more power.
3) Use technologies such as compound turbine to increase the power output.
The possibility for first option is not feasible at all as separate research and development teams and budget is required for designing and analysing a high performance diesel engine.
The second option seems to be quite feasible and has better chances over the other two options. Let me explain this with an example. TATA motors have a 1200cc petrol engine which is called as Revotron. The same engine is used in multiple cars with multiple power outputs. In Tiago and Tigor, the engine generates 86 bhp. In altroz it generates 108 bhp with the help of a turbo-charger. The same engine is used in nexon, where it generates 118 bhp which uses more boost pressure than the altroz. In Tamo Racemo, the same 1200 cc engine is used to generate 189 bhp. This is achieved because of the higher boost pressure used. So the conclusion is, by manipulating the boost pressure provided by the turbo-charger, the power output can either be decreased or increased. This method is quite economical as the engine practically remains the same albeit for some forged parts to handle the extra pressure and stress. This method involves very less change in the engine design and using this method helps to maintain commonality across the platforms.
In this method, a low pressure turbo-charger is connected in series to a high pressure turbo-charger. The fresh which has to enter the cylinders first flows through the low pressure turbo-charger and then that air is passed through high pressure turbo-charger for higher compression. This method especially is used to reduce the lag and increase the boost pressure in stages, just like the multi stage compressor in jet engines.
From the above picture, it can be noticed that the out let of the turbine from turbo-charger A is connected to the inlet of the turbine for for turbo-charger (black pipe).
The technology used by CVRDE for the 2000 bhp is still unknown. Its also unknown if CVRDE has started a separate project to design the 2000 bhp engine from scratch or they plan to use the same 1500 bhp engine to form the base for the 2000 bhp engine and manipulate the boost pressure to increase the power output.
Only time can answer these questions and till then all we know is there is a 2000 HP Engine in making.
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Interested about CVRDE’s 1500 bhp engine? Read here.