Quote:
Originally Posted by danallxt
I agree. I did not mean to imply that it is famous for that particular failure.
The question is....whether most boosted GDI engines have a propensity of LSPI events or just very small displacement engines. From what i can find it's more a matter of high cylinder pressure combined with direct gas injection, now there may likely be a threshold (or not) where the frequency of those events occur depend upon amount of boost or turbo psi combined with engine compression that results in a condition favorable for LSPI. Have not seen any studies on that.
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I think the issue is power density - which we see much more today than we did a couple decades ago. Today we're seeing 1.6 liter turbo engines that pack a serious punch, in relation to their size. This power density leads to a lot of boost at low RPM to make up for the lack of torque that we take for granted in larger displacement motors...like ours. Granted, 3.0 liters isn't huge, but it's significant compared to 2.0 liter 4 cylinder engines that need a lot of low-end boost to accelerate from a low speed.