centurion
Well-Known Member
Something I noticed about the new 997 - The Cayman Club
good balance of simple language and simply put technical detail.
'It’s radically different, and we have to rethink the way 4 stroke engines operate, because they do not work the same way with DFI. When the fuel is injected in the compression stroke as opposed to the intake stroke, it’s a whole new ball game.'
'In a DFI engine, we have no fuel in the intake charge whatsoever. Fuel is not introduced until the valve is not only closed, but the piston has traveled virtually all the way (but not quite) to TDC of the compression stroke. At this point, the dynamics of the intake charge behavior is completely changed, the gas (air) is now under significant pressure as well as heat, and of course the volume is reduced to 1/12th of the original static volume.'
good balance of simple language and simply put technical detail.
'It’s radically different, and we have to rethink the way 4 stroke engines operate, because they do not work the same way with DFI. When the fuel is injected in the compression stroke as opposed to the intake stroke, it’s a whole new ball game.'
'In a DFI engine, we have no fuel in the intake charge whatsoever. Fuel is not introduced until the valve is not only closed, but the piston has traveled virtually all the way (but not quite) to TDC of the compression stroke. At this point, the dynamics of the intake charge behavior is completely changed, the gas (air) is now under significant pressure as well as heat, and of course the volume is reduced to 1/12th of the original static volume.'
