30-04-2012, 10:00 AM
But it doesn't all burn instantaneously when it is injected like a DI, the entire point of IDI is the very steady burn, that's why the pre combustion chamber outlet is so accurate... Yes, if your timing is TOO far advanced, you'll get the majority of the burn happening before it's any good, but you NEED the advance to have the majority of the burn happening at the RIGHT time... The injection length of an IDI is incredibly long in comparison to a DI - moreso when you've got elevated levels of IQ, but you've got to fit all the burning fuel through the Precup port, so that's fine, it keeps a steady burn throughout the stroke.
DI is completely different, it explodes almost as you inject the fuel into the cylinder in that TINY window that DIs have... If you put it in too early, you'll end up almost turning the crank backwards - yes less work done...
You've got to break some eggs to make an omlette - i.e. you need more advance, but if it's in moderation, it's helpful to get the fuel burning at the RIGHT time...
DI is completely different, it explodes almost as you inject the fuel into the cylinder in that TINY window that DIs have... If you put it in too early, you'll end up almost turning the crank backwards - yes less work done...
You've got to break some eggs to make an omlette - i.e. you need more advance, but if it's in moderation, it's helpful to get the fuel burning at the RIGHT time...
