Photo 1.
Photo 2.
Valve Cover adaptation and extra oil / cylinder head cooling.
Photo 3.
Photo 4.
Photo 5.
Photo 6.
Photo 7.
Photo 8.
Click 4 Big on the pictures.
The crankcase ventilation worked in such a way that too much
oil spurted out. Too often shoes and socks were full of oil.
The old ventilation method is not surprisingly completely
removed. Instead of that there has come a connection on the
valve cover, on which simply a hose gets connected and the
hose will be led away backwards. The hose is long enough to
handle the piston displacement. The crankcase ventilation
'breaths' now 50cc back and forth by every movement of the piston.
This method is already old and works perfectly. Watch photo 1 and 2.
oil spurted out. Too often shoes and socks were full of oil.
The old ventilation method is not surprisingly completely
removed. Instead of that there has come a connection on the
valve cover, on which simply a hose gets connected and the
hose will be led away backwards. The hose is long enough to
handle the piston displacement. The crankcase ventilation
'breaths' now 50cc back and forth by every movement of the piston.
This method is already old and works perfectly. Watch photo 1 and 2.
The Nassetti Sery engine is often dissembled for repair. During these repairs also some other
problems were tackled. Photo 3 shows the locking method of the rocker-shaft. This
construction is good, but when you work more often on the engine you can work better with
iron wire to lock. For this purpose there are made holes in the rocker-bracket and in the nuts
which have to be locked. Photo 3 , 4 and 5 show this change.
As already said, the cooling of the engine seemed not to be up to par in practice, surely with
warm weather or with long efforts of the engine when there are hills or headwind. The heat
dissapation through the valve cover was zero.
I thought that could be improved. After some experimenting there is placed a sort of oil-cooler
in the valve cover which gives warmth to a cooler on the valve cover. For this purpose the
central valve cover-stud is lengthened. Over this stud I place a tray, then a short pressure spring
and an aluminium cooler. The spring takes care that the cooler will be pressed against the valve
cover, when the valve cover will be assembled. Photo 7 shows the composition clearly. When
everything is assembled, you can see on photo 8 how that
looks like. Then there is the question if it works. Yes,
it works very good. Before the improvement the valve cover
could become so hot that the sealer began to leak, often the
gasoline began to boil in the carburator by the heat and the
engine oil became very hot and thin. Also by some other
adaptations (watch the workshop) all these problems have
become less and the engine works more stable.
problems were tackled. Photo 3 shows the locking method of the rocker-
iron wire to lock. For this purpose there are made holes in the rocker-
As already said, the cooling of the engine seemed not to be up to par in practice, surely with
warm weather or with long efforts of the engine when there are hills or headwind. The heat
dissapation through the valve cover was zero.
I thought that could be improved. After some experimenting there is placed a sort of oil-
central valve cover-
cover, when the valve cover will be assembled. Photo 7 shows the composition clearly. When
everything is assembled, you can see on photo 8 how that
looks like. Then there is the question if it works. Yes,
it works very good. Before the improvement the valve cover
could become so hot that the sealer began to leak, often the
gasoline began to boil in the carburator by the heat and the
engine oil became very hot and thin. Also by some other
adaptations (watch the workshop) all these problems have
become less and the engine works more stable.