The 'What did you do in your workshop tonight?' thread
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Bluepilot2003
70cc twin V2
I covered the wings and started on the fuselage the last two nights. I really do hate covering round edges!
49dimes
Damn I'm hungry
Gold head 60. Old school pattern engine . Saw this one for sale for about 80 bucks....
Bluepilot2003
70cc twin V2
To make sure the engine gets destroyed if you put the head on the wrong way, of course!
Alky6
150cc
That is a cross flow scavenged engine versus the typical loop scavenged (schnerle) of today's high performance engines. Transfer ports are directly opposite the exhaust. The baffle directs the fuel/air mixture up the cylinder wall around the top and back down and out the exhaust. Without the baffle, the fuel/air would just go straight out the exhaust. Very inneficient and very difficult to make an expansion chamber work on them. The original Mercury outboard engines were based on this design, of course the baffle was a little more of an elegant design in those. These small cylinders don't need much. Lots of cantamination and mixing with fresh fuel/air and exhaust. Also difficult to get enough transfer port area to really make them go. The notch in the head is to make room for the baffle so you can still get enough compression. Highly prone to detonation.
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49dimes
Damn I'm hungry
Thank goodness for Paul!
. I was going to reply.... "I really don't know??? 
" . Or....." It was made that way to make you ask questions".
Alky6
150cc
Thank goodness for Paul!
