b40rt Posted March 22, 2011 Report Share Posted March 22, 2011 Why for? Does pre-mix inhibit atomisation? The pre-mix never gets into the crankcase to lub the mains, straight into the combustion chamber. (I think) Quote Link to comment Share on other sites More sharing options...
neo Posted March 22, 2011 Author Report Share Posted March 22, 2011 No it's just that the oil (even if it's mixed in the fuel) has no chance of getting down past the piston leaving both the big end and the small end high and dry!! The conventional enging showing the fuel going past these bearings. So the question is....is this why Sherco redesigned their engine casings??? Best of balance. Neo Quote Link to comment Share on other sites More sharing options...
toofasttim Posted March 22, 2011 Report Share Posted March 22, 2011 DI means the petrol (not mixture) is injected into the chamber after the ports have closed. So the crackcase gets pure air and, hence, no lubrication. The other way to do it is "blow" (super or turbo charger) air directly into the champer bypassing the crankcase. In this case you can have a wet sump. This is how big marine 2t diesels work. Quote Link to comment Share on other sites More sharing options...
b40rt Posted March 22, 2011 Report Share Posted March 22, 2011 case you can have a wet sump. This is how big marine 2t diesels work. They also rev at 2/300 rpm, but they do have a dual map switch which makes a noticeable difference at 10,000 rpm. Quote Link to comment Share on other sites More sharing options...
neo Posted March 23, 2011 Author Report Share Posted March 23, 2011 Maybe not Di but SDI ... check out this link Best of balance. Neo Quote Link to comment Share on other sites More sharing options...
neo Posted March 23, 2011 Author Report Share Posted March 23, 2011 Or Di in a scooter too link Best of balance. Neo Quote Link to comment Share on other sites More sharing options...
ham2 Posted March 23, 2011 Report Share Posted March 23, 2011 Cheers boys. I think you're all getting at the same thing; I didn't realise Di meant the fuel was only delivered into the combustion chamber. The only experience of GDI (gasoline direct injection) was with the Mitsubishi Charisma engines...which required top end de-coke every 12,000 miles. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.