Pushrod Engine Drawings
Cross section of 1618cc fuel injected head. Notice that it has smaller inlet ports than the KF6/XN2 head. These inlet ports are supposed to be similar to those in the XN1A head. These are ideal for multiple carburetors.
Standard XM head (almost identical to the early XN1 head in this view, except that the XN1 has a slightly larger combustion chamber). Notice the sharp edges in the ports just behind the valve seats and the excess material around the valve guides.
Modified XN1 head, which is ideal for road cars.
Notice that the sharp edges near the valve seats have been removed. The excess material around the valve guides has also been removed and the guides have been tapered more and shortened slightly. Notice also the venturi shaped inlet valve seat insert (standard on heads made after the mid-late 1970s)
More modified XN1 head, with larger exhaust valve which allows the short side curve of the port to be more gradual. Notice also that the exhaust valve guide has been shortened considerably. The roof of the exhaust port has also been raised by 1 or 2mm (be careful here, because the water jacket is quite close). The inlet side of the head has been modified to allow the fitting of multiple carburetors. This is one of the best heads for multiple carburetor cars.
KF6/XN2 head (XN2 has slightly larger combustion chambers). Notice that the inlet ports are much bigger than the XM and XN1 heads. These ports are really too big for carburetors, but they are fine for fuel injection. The exhaust ports are identical to the XM and XN1.
KF6/XN2 head modified in a similar way to the XM/XN1 head above. The 140hp 504 rally cars used 44.5mm inlet valves and 37.5mm exhaust valves (2mm larger than standard in both cases).
1796cc Kugelfischer Fuel Injected Engine
1796cc XM Carburetored Engine
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