Old holden with a turbo advice please?

hi i have a old holden hk wagon with a 202 3.3 ltr motor & im thinking of putting a custom made turbo manifold with turbo on it & im wondering do i have to get a different head gasket for a turbo as im told i may need to decompress the head pressure.



Yes you will need to lower the compression ratio. And beef up the lower end. To be honest it involves a lot of work if you want it done properly and for the engine not to be unreliable. You say you have 'an old holden'. I'm guessing that means old and worn. Old and worn motors don't take too kindly to suddenly having forced induction on them. You will find things will break. You will need to richen the mixture up when on boost because if you don't you will get a weak mixture. Weak mixture means hotter burning and that will lead to melted pistons. You will have more luck in transplanting a turbo motor into your car. Sadly it isn't 'just' a case of bolting a turbo onto your motor. Even if your model comes with a turbo engined option in other models, your two engines won't be the same. The turbo engine will have uprated internals compared to your non turbo engine.




If you do that than why put a turbo on it? Thank about what a turbo does..... What you will need to do is replace the piston rings, both, oil and compression. The ones you have in there will not hold up to the added pressure on compression and ignition strokes. If you don't than the first thing you will find is excessive oil blow by and fuel in your oil. Why do kids always want to soap up something not meant to be sup-ed up?