It seems to me that a lot of the Stag's problems are due to the cast ally head. I am not sure about the technology of ally heads.
Pro's? They are lighter, there will be better heat transfer to the outer surfaces making the surface temperature higher thus giving greater heat radiation and dissipation.
Cons? Weak, particularly at high temperatures, aluminium creeps alarmingly at 200 degrees C. Noisier due to low density. Porosity problems Corrosion problems
Aluminium is difficult and expensive to cast, beacuse its done in dies, whereas cast iron is easy, it flows much better and wont suffer porosity. Also it would overcome the valve seat problem.
Seems to me we need an engine designer to come up with a light four valve Stag head in cast iron and for some retired pattern maker to make some inexpensive patterns and core boxes that will do the business. Put that lot on top of the strong bottom end and you would have improved performance with no grief
Pie in the Sky!
Al
Pro's? They are lighter, there will be better heat transfer to the outer surfaces making the surface temperature higher thus giving greater heat radiation and dissipation.
Cons? Weak, particularly at high temperatures, aluminium creeps alarmingly at 200 degrees C. Noisier due to low density. Porosity problems Corrosion problems
Aluminium is difficult and expensive to cast, beacuse its done in dies, whereas cast iron is easy, it flows much better and wont suffer porosity. Also it would overcome the valve seat problem.
Seems to me we need an engine designer to come up with a light four valve Stag head in cast iron and for some retired pattern maker to make some inexpensive patterns and core boxes that will do the business. Put that lot on top of the strong bottom end and you would have improved performance with no grief
Pie in the Sky!
Al
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