22-01-2020, 10:46 AM
On a lighter note - my 35+year old motor mower has a 3.5 hp Briggs and Stratton side valve engine .
The combustion chamber is very similar to the late iron head but with a trough on the exhaust side .
Surprisingly the larger inlet valve opens BTDC with the exhaust still open .
A drop of Castrol R in with the petrol and its a pleasure cutting the grass .
One of the slight advantages of either the Whatmough or Ricardo heads is the improved water flow over the length of
the head , not just through a slot at the front as with the iron heads .
The combustion chamber is very similar to the late iron head but with a trough on the exhaust side .
Surprisingly the larger inlet valve opens BTDC with the exhaust still open .
A drop of Castrol R in with the petrol and its a pleasure cutting the grass .
One of the slight advantages of either the Whatmough or Ricardo heads is the improved water flow over the length of
the head , not just through a slot at the front as with the iron heads .