Hi everyone!


I'm trying to wrap my head around avcs in an ej25. From scouring forums I have some conflicting information:


-at zero intake advance, the valve opens at 5* ATDC
-the max advance on the intake cam is 30* of crank rotation
-the ej25 is an interference engine, in which the valves and pistons occupy the same space


If all this is true, wouldn't the intake valves collide with the pistons at TDC, making 5* of intake advance impossible, let alone 30?


I'm sure either there's a gap in my understanding or my information is not correct. And help would be appreciated!