Posted by RN on June 27, 2013 at 12:08:54 from (68.190.81.226):
In Reply to: Continental N62 posted by patsdeere on June 26, 2013 at 20:45:20:
Old side valves L head - spark plug more toward valves as that is the combustion chamber area- Ricardo research in 1930s showed this was about the most practical arrangment espically if compared to T head designs. need to visualise the sidewise ? of head and piston -the valves are in the 'loop' of ? and when piston is a top of stroke the charge is forced into the 'loop' with a swirling action. this swirl mixes the fuel air and when a spark is put close to the center of the swirl, then the flame front does a mostly even burn with minimal detonation. The burn fuel/air pressure gets to top of piston at edge and power to crankshaft is a bit offset, lesser then a 'tighter/rounder' OHV design capable of - but making the compact L head with valves to side has less parts, much simpler head casting needed, less valve train needed and valve lubrication simple vapor and splash works mostly. One OHV advantage is airflow at higher rpm means more power- but if you're only turning 1300 to 3000 rpm that isn't a big deal. Other advantage of OHV is possible higher compression and tighter piston to cylinder clearance, direct flame front and pressure to top of piston- this is definite advantage but consider your intended use- is it worth the extra maintenance and castings? Ford 8N or IHC A, B, C, AC B engine about same size 113/125 cubic inch- Ford lower cost for a bit less but usable power means lots of Fords sold- and IHC Cubs, AC G, Massey Ponies got along with the L heads a long time- you're still fixing them aren't you to use in playing in the dirt? RN
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