Flying Scotsman
Well Known Member
OK, this is probably an insanely stupid question, but here goes...
After reading another thread which indicated that some angle valve engines had a different rear plug than parallel valved engines, it occurred to me that a lot of discussions reference the angle-valve this or the parallel-valve that engine, for things that seem to have no relationship to valves at all (like rear crankcase plugs). So I got to thinking...I've never really heard a good explanation of *why* an engine would have angle valves, or for that matter, parallel valves. Everybody just seems to "know" which engines are which, but I've never heard a reason why...
e.g., Why is the Lycoming IO-360 w/ 200 HP an angle-valve engine, and the 180 hp model is parallel? What's different about the engine that makes that choice? (And what does it have to do with rear crankcase plugs?
). Etc...
Anyway, like I said...probably a really dumb question with a stupid, simple answer, but I'm not an engine guy...all this is new to me LOL!
TIA!
After reading another thread which indicated that some angle valve engines had a different rear plug than parallel valved engines, it occurred to me that a lot of discussions reference the angle-valve this or the parallel-valve that engine, for things that seem to have no relationship to valves at all (like rear crankcase plugs). So I got to thinking...I've never really heard a good explanation of *why* an engine would have angle valves, or for that matter, parallel valves. Everybody just seems to "know" which engines are which, but I've never heard a reason why...
e.g., Why is the Lycoming IO-360 w/ 200 HP an angle-valve engine, and the 180 hp model is parallel? What's different about the engine that makes that choice? (And what does it have to do with rear crankcase plugs?
Anyway, like I said...probably a really dumb question with a stupid, simple answer, but I'm not an engine guy...all this is new to me LOL!
TIA!