Yet again we are entering this very famous discussion. Many Volkswagen fans have approached us asking our opinion. So which is better? This depends on what you are looking for in an engine. Here is our comparison of the 2 VW engines.

Cost of engine and future repairs
The 8v engine is a lot cheaper than the 16v often being close to half the price. The reason being that these engines are quite common as well as costing less to produce in the first place.
Where repairs are concerned, the parts are more common as well as cheaper. In addition, if you are paying per valve, you are going to need double the amount of valves if your valves have been bent. You also have 2 camshafts in the 16v as opposed to one in the 8v engines.
Engine reliability factor
The 8v VW engine is known to be strong and reliable at all times. Many people actually call it virtually unbreakable if taken care of properly.
The 16v VW engine is also strong but if you are turbocharging it, the standard internals are not as strong as the 8v. The 16v is an interference engine unlike the 8v meaning that if you snap your timing belt, the probability is great that you are going to say hello to bent valves. This can always be avoided if you check your belt once in a while as well as take good care of the engine.
Most people actually ruine the VW engines by over revving them all the time. You cannot help the great noise that it makes when you floor it past 4500 RPM. It's hard to find a 16v in excellent condition. That is what makes us at Engines for sale more valuable to our customers. We inspect all of our supplier's engines and make sure you are getting decent engines. Not all import low mileage engines are good.
8v's don't break as quickly as 16v's do and that is a fact.
Power and Torque
So many people will say 8v has lower end torque and 16v better in the upper range. Even that we personally tested a few cars and 8v is slightly better right in the beginning by like a few centimeters, we have some proof for you in the form of a dyno graph.

As you can see, the 16v really kills a 8v at 2000+ RPM. Don't even bother comparing the 2 engines. Remember the longer intake runners give better low-end torque.
Which engine is better for tuning?
You can make a lot more power with a 16v than you can with an 8v, dollar for dollar. If you compare the fastest 16v to the fastest 8v in both normally aspirated and turbocharged applications, the 16v always wins hands down. The 16v flows better and has much greater potential. Go look at dyno results as well as quarter mile records worldwide and you will see for yourself. Many people assume the 8v is faster. Remember the 16v engine came in the heavier Golf MK2 cars so the lighter 8V mk1 usually gave it a good run for its money until the 0-60kph mark and then the 16v would give it a hiding.