Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

2 stroke vs 4 stroke engine pollution

  • 27-04-2011 12:07am
    #1
    Daegerty
    Closed Accounts Posts: 1,864 ✭✭✭


    Just exactly how much worse is a modern 2 stroke engine versus a similar power 4 stroke engine these days?

    I'd be reading stuff about some older 2 stroke engines being as bad as 50 cars but I don't know what to believe. No tests and figures to come by either


Comments

  • #2
    Del2005
    Registered Users, Registered Users 2 Posts: 19,102 ✭✭✭✭Del2005


    Older 2 strokes used to be terrible but AFAIK modern bikes are OK.

    It was California which killed off the 2 stroke bike when they banned them. But some EU manufactures, who don't have many US sales, have started making them again and they are compliant with current and future EU emissions laws.

    Not too sure about lawn mowers, chainsaws etc.


  • #3
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 93,603 Mod ✭✭✭✭Capt'n Midnight


    Some of the most efficient engines are the huge 2 stroke diesels used in ships. They run slowly so don't need a gearbox which helps efficiency too.
    The slow means compustion is burning at constant pressure, as the piston moves and there is more space in the cylinder rather than a constant volume detonation like in petrol engine


Advertisement