[blaisecardoz]

what is the doffrence in the engines

[tooseevee]

what is the doffrence in the engines

           Which engines?

            Where do you want to start?

             100 years ago?

               50 years ago

                 10 years ago?

                  You need to ask a more focused question, I think.

[GlennF]

The B5/G5/C5 engine is fuel injected, has a normal sump and the gearbox is built into the engine like a jap bike. Reliable modern engine but also looks modern.

The older engines had a carby, were dry sump (like a rotax aircraft engine) and the gearbox was separate from the engine (the way cars still do it). It has that 40's look and also the reliability problems from the 40's as well.

[palace15]

Is there anywhere with text and pictures that explain different models as I am often confused when people talk of; Classic, Thunderbird, AVL, machisimo, leanburn, sixtyfive B5, G5 etc.I know the C5, I have one!

[barenekd]

All of those are pictured in the gallery. Of course, that is somewhat in jest as you still have out which is which. Basically, there are only three engines options, iron barrel, AVL and UCE. There are a few Iron barrels that have a starter mounted on the of the front of the engine, the Sixty-5 (sixty year anniversary model with a 5 speed) and a couple of other late model ones, 2004 and later. The AVL engines (Electras) were built as an interim thing while Enfield developed their UCE (B5s, C5s and G5s). Most of the other names were trim changes. Although the lean burn and twin spark were minor engine changes in the basic three.
Bare

[Arizoni]

blaisecardoz

The Iron Barrel is the old design dating from the 1930-1955 era.
It is a pushrod operated overhead valve engine which uses a plunger type oil pump to lubricate the rolling element crankshaft bearings and sleeve bearing connecting rod.  The rocker arms and valves are lubricated thru an external oil supply line.

The Indian made AVL engine was a Austrian re-engineered Iron Barrel with attention being given to lubrication and fuel economy.
A gerotor style oil pump replaced the plunger type pump to provide better oil flow.  Gerotor pumps are essentially a gear inside a gear.  They are usually high pressure positive displacement pumps with both gears rotating to move the fluid.  They are used on everything from simple reciprocating engines to jet engines.

The current Indian made Unit Construction Engine was totally re-engineered  to address many of the weaknesses of the older designs.

Among the things that were changed was the addition of hydraulic valve lifters so that valve adjustments are no longer needed.
An automatic compression release was added to aid engine starting and anti-kick back on shutdown.
The connecting rod was changed from aluminum to steel with rolling element bearings for the lower rod end to compliment the rolling element bearings on the crankshaft.

The transmission gears which had been in a separate transmission on the Iron Barrel and AVL powered motorcycles were relocated into the engine crankcase like almost every other motorcycle engine made today.

The UCE powered bikes use either a carburetor or fuel injection depending on the model.

With the addition of fuel injection several engine sensors were added to inform the computer about throttle position, engine speed, oil temperature and atmospheric pressure.  Many of the exported,  fuel injected UCE's also use a oxygen sensor to analyze the exhaust gasses.  This allows the computer to adjust the fuel/air mixture to minimize pollution while maintaining a high fuel economy.

Electric starters have been used on all three engine designs however the results on the older Iron Barrel and AVL engines were questionable to say the least.  The electric starters on the UCE engines usually are fairly reliable.

[Lwt Big Cheese]

It has that 40's look and also the reliability problems from the 40's as well.

What problems are they then? Because I don't have any.

No indicator problems, no sprag clutch problems, no oil catch can problems shall I go on on?