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Are you sure the valves on the 4 unused cylinders aren't held open so the motor won't have to be doing this extra work on compressing air then sending it out the exhaust pipe.
If they are not open but operating normaly, I see a major problem. When the intake valve opens it is drawing air in at atmosperic pressure & an ambient temp of lets say 80 deg F or about 28 deg C. The air temp & coolant temp of 190 F will be trying to reach equalbrium & the rate of heat ransfer will determine how hot the air is before it is compressed. Much of the work of mechanical energy of the compression stroke is turned to heat energy. Lets say you have 6 to 1 effective compression. Don't have a chart in front of me but lets say that raises the air temp to 500 F or 270 C. The coolant is cooling it down and as the pistons goes back down releasing pressure the coolant is trying to get the air to 190 F. The pressure gets down close to atmosheric & the air is hotter from the coolant as it is pushed out the exhaust valves to super charge the other cylinders.
You end up with no more oxygen to burn fuel but it is a lot hotter which can cause detonation.
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drew1
wife has 924 turbo
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