Yes, you can adjust some weights, but you can't adjust the engine weight directly though? It is being calculated based on the size of the engine. At least I can't find any other way on how to change the engine weight. Please share if you know a way.
I was trying to design the LS2 engine, but I've found that if you make your engine size 6ltr, it will be too heavy (around 300kg!). I think in overall car design the weights of components are really important. I had to downsize it to around 4 ltr and play with the settings to get the correct torque/power curves to match LS2. Do you guys face similar issues or is there a workaround for that?