Classic Audi - View Single Post - More power from a 1.8 k-jet engine in a 80 sport

K Simmonds · 29-01-12, 10:36 AM

The best route to more power with Four pot K-Jet motors, 16V or 8V is more displacement using a SHORT STROKE bottom end, 6A/9A for 16V's or 3A/AAD for 8V's, for example, combine these with head work for excellent results.

These are just the common ones, many others are out there, though not all in the UK.

There are quite a few other VAG models for the late 80's and early 90's with variants of the 2.0 short stroke bottom end. These are basic but useful guide's to what you might find hiding under the bonnet of various Audi's or VW's either in scrappers or just going cheap. Pity the these list's don't tell you how many cylinders or valves the engines have as there are quite a few five pot 2.0 engine to confuse matters. But still, with a bit of cross referencing and research you will find easy answers.

http://www.autoshoppingcenter.com/Vo...ginescode.html

And that's just the Audi units

Here are the VW ones,-

http://www.autoshoppingcenter.com/Vo...ginescode.html

One of these bottom ends combined with some basic head work/multi angle valve seat cutting plus good assembly practice such as matching up manifolds ect is far and away the most effective solution.

Forget the latter long stroke blocks, they don't like to rev unless heavily modded and don't really fit properly in a car that had a 1.8 short stroke bottom end as standard.

K-jet can be made very reliable at the higher flow levels involved, the warm regulators can be tweaked as can the metering heads. There is also much choice when it comes to injectors. Going Common rail with EFI is unarguably better, especially when it come to economy but is far from being essential for good results.

Carb's and individual Throttle bodies are a waste of time unless you REALLY know what you are doing and have cams custom profiled to suit.

29-01-12, 10:36 AM	#24
K Simmonds Senior Member Classic Audi Club Member Join Date: Dec 2009 Location: Mid Wales Posts: 1,060	The best route to more power with Four pot K-Jet motors, 16V or 8V is more displacement using a SHORT STROKE bottom end, 6A/9A for 16V's or 3A/AAD for 8V's, for example, combine these with head work for excellent results. These are just the common ones, many others are out there, though not all in the UK. There are quite a few other VAG models for the late 80's and early 90's with variants of the 2.0 short stroke bottom end. These are basic but useful guide's to what you might find hiding under the bonnet of various Audi's or VW's either in scrappers or just going cheap. Pity the these list's don't tell you how many cylinders or valves the engines have as there are quite a few five pot 2.0 engine to confuse matters. But still, with a bit of cross referencing and research you will find easy answers. http://www.autoshoppingcenter.com/Vo...ginescode.html And that's just the Audi units Here are the VW ones,- http://www.autoshoppingcenter.com/Vo...ginescode.html One of these bottom ends combined with some basic head work/multi angle valve seat cutting plus good assembly practice such as matching up manifolds ect is far and away the most effective solution. Forget the latter long stroke blocks, they don't like to rev unless heavily modded and don't really fit properly in a car that had a 1.8 short stroke bottom end as standard. K-jet can be made very reliable at the higher flow levels involved, the warm regulators can be tweaked as can the metering heads. There is also much choice when it comes to injectors. Going Common rail with EFI is unarguably better, especially when it come to economy but is far from being essential for good results. Carb's and individual Throttle bodies are a waste of time unless you REALLY know what you are doing and have cams custom profiled to suit.