SV650 v RGV250.

There is technology that could make 2-smokes () less stinky. Direct injection could be one thing; however, this is difficult. Look how much crap bimota went through with the V-Due trying to implement it. Arguably, a manufacture with more money to develop the technology could make it work, but with 1 bang per two strokes, what about the damage caused on the injection nozzle? As far as I know, this is one thing that has hindered the implementation of direct injection on 4-stroke petrol engines (some manufactures are trying it with diesel engines now too!)

I agree two-stroke engines make excellent powertrains, but the reliability is questionable unless you are enthusiastic about maintainence (and seeing some of the final drive chains on bikes, it would appear most people arn't overly enthusiastic about getting their hands dirty..).

In other news, I have read articles about 2-stroke engines working very very well with ethanol as the fuel - apparently, this way its much cleaner than a petrol engine. However, because of how the engine is lubricated, you'll always be burning oil, which will always take away some of the green advantage that could be obtained










how much of what i just wrote was bullcrap

Originally Posted by alpinestarhero

As far as I know, this is one thing that has hindered the implementation of direct injection on 4-stroke petrol engines (some manufactures are trying it with diesel engines now too!)

how much of what i just wrote was bullcrap

Diesels always have been, always will be Direct injection...... Its how they work.

Direct injection is used in 2/4 stroke petrol engines as well, afaik it is the only way aprilla can get through the emission tests using a 2 stroke ?

4-strokes use 19 seperate, moving parts to run one cylinder/piston.

2-strokes use none!

I would say that make them potentially way more reliable than 4-strokes - way less to go wrong...

Originally Posted by Jackie_Black

A car company (perhaps lotus) is currently working on direct injection 2 stroke car engines that produce stupid power, weigh nothing and don't throw out loads of rubbish.

That would be Orbital in Perth, Australia. They were given the task of perfecting the Bimota V-Due injection system to make it reliable and clean enough to be sold in California. They very nearly managed it too.

Orbital have recently cut back their development budget due to the credit crunch and are laying off very highly qualified and experienced engineers. I know this because my ex-girlfriend is one of them (a PhD in Mechanical Engineering who has had a number of research papers published and who specialises in hydrogen engine development). Luckily she's found a new job lecturing at the local university.

2 Strokes rule!

4 Strokes suck

I still gotta rebuild the 350LC at some point....

[punyXpress]

Nothing will really change in 2 strokes' favour until MotoGP does. At present it's going the other way.

What we really want is a 500cc supercharged V-twin (4 stroke)

Na, id love to have a 2 stroke! If I had the money id get a RG500 and put it in a nicer fram and stuff then thrash it about a track

The problem on the Jap manufacturing side is that they are selling 4-strokes, people are buying 4-strokes and the factories are tooled up to make 4-strokes so why would they want to start making 2-strokes? - it's a business at the end of the day... (

Originally Posted by daveb

I would say that make them potentially way more reliable than 4-strokes - way less to go wrong...

Depends, a well built 4 stroke car engine will last 200,000 (currently one in our car club is @ 250,000 miles) made by toyota/cosworth etc.

The rpm is not as high as a bike (7,000) so the valve train doesn't get as much of a thrashing, but could a two stroke ever get close to that sort of mileage?