KR vs ABF

What is the difference in the heads on these engines? Are the cams different? The valve sizes?

 

Seat ABF and VW ABF engines have different tappets (Seat are lighter) and different cams.

KR engines have slightly different heads than ABF heads.

KR engines are a shorter stroke than the ABF engine.

 

ABF exhaust ports flow more than KR (by quite a lot actually). The combustion chamber shape is better on the ABF and the valves are also less shrouded.

The ABF is a tall block, so has longer rods. The ABF also has a slightly hotter camset.

The KR inlet ports are larger and flow more than the ABF ones. The engines are very similar but when you look carefully, there's still a lot of small differences.

 

In a good way Craig? Just wondering as mines the SEAT ABF.

 

Yes, in a good way, although you'd hardly notice the difference on a standard engine

 

I certainly noticed a less revvy engine since putting in VW tappets and KR came.

As son as i have some finances available i'm going to fit SEAT tappets and re-fit my Seat ABF cams.