AVL engines in Royal Enfield.

AVL Engine in Royal Enfield bullets.

AVL stands for Anstalt für Verbrennungskraftmaschinen (German Institute for Combustion Engines),so this is an Austrian-based automotive consulting firm as well as an independent research institute. It is the largest privately owned company for the development of powertrain systems with internal combustion engines. So the engines build on there platforms known as AVL engines.

So what is different in these AvL's engines.

The AVL is an all aluminum, lean burning engine where as the earlier Cast iron engines were havier. AVL engines have geared oil pump, which is more durable and less prone to oil pump problems, and has a capacity to pump the oil 40% more efficiently than the conventional Plunger pump of Cast iron engine.

The AVL engines have oil seals on the Valve Guides of the engine, which ensure the leak proof performance of the engine as compared to the classic Cast iron engines, which have the long history of oil leaks.

The compression ratio of AVL engines is more then Cast iron engines, hence it produces more power, although the company claims that both the engines produces same 18 bhp of power.

The advantages on these AVL's engines over CI engines were:-

1-Less heating of the engine because of aalloy material.

2-Increased durability.

3-Less maintenance required due to less heating, proper pumping and leakage proof function.

4-less engine oil consumption.

5-Less Fuel consumption hence better mileage.

The major negative thing about these engines  was there was no exactly same Thumping sound as it used to be in Cast Iron engine because of aluminium construction of AVL engine, thus it loose interest of a huge bulletiers.

Similarly as Cast Iron engine this AVL engine also divided into 3 parts:-

1- Combustion cylinder Assembly. 

2- Gears Assembly. 

3- Clutch Assembly.