variable valve timing wouldnt have any effect on the compression. variable valve timing is to improve performance out of small motors like 4 clyinders, improve emissions and fuel mileage. It has no affect on the ability of the motor to hold air in closed container, the combustion chamber. an engine in a mechincal sense is a huge air pump.

When doing a compression test make sure you cut off the fuel supply and count the same number times for each clyinder. i have access to alldata pro.

__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)