01-22-2017, 11:05 AM
i don't have that exact stuffer but the idea would have been to eliminate as much open area as possible in the crankcase. i have a few aftermarket engine specific stuffers for mcculloch. they only fit the engine number cast into the base of the stuffer. mcculloch also had engine specific stuffers for some saws.
stuffing theory is that you want as little room as possible in the crankcase so the fuel charge keeps its velocity.
when expansion chambers came into karting stuffing became un necessary.
rather than the fuel being pushed into the chamber by velocity (open header) the pipe draws the fuel into the combustion area with vacumn.
circle cranks are also part of the whole stuffing theory. a really well built motor back in 59/60 would have ALOT of epoxy custom fit into the internal crankcase areas that normally are open.
oddly enough i have been told more than once a flat plate on short twisty sprint tracks is better than any stuffing at all.
on longer tracks the stuffing becomes important. have never tested that idea,
dave l
stuffing theory is that you want as little room as possible in the crankcase so the fuel charge keeps its velocity.
when expansion chambers came into karting stuffing became un necessary.
rather than the fuel being pushed into the chamber by velocity (open header) the pipe draws the fuel into the combustion area with vacumn.
circle cranks are also part of the whole stuffing theory. a really well built motor back in 59/60 would have ALOT of epoxy custom fit into the internal crankcase areas that normally are open.
oddly enough i have been told more than once a flat plate on short twisty sprint tracks is better than any stuffing at all.
on longer tracks the stuffing becomes important. have never tested that idea,
dave l