DIY Two-Stroke Engine
On Thu, 18 Mar 2010 13:39:45 -0700, Tim Wescott
wrote:
Grider Pirate wrote:
On Mar 14, 11:30 pm, durabol wrote:
Thanks for the responses. I meant for ultralight or light aircraft
with 20-40hp from 1 or 2 cylinders. I definitely want to copy as much
as I can since I'm not engineer. I planned to have the RPM at about
4000 in order to get enough power out of the engine but I may reduce
the rpm if I can get enough power. Also I may have to weld the crank
together to handle the propeller loads.
Brock
'Restrictive' exhaust isn't a good way to avoid venting unburnt fuel,
and it will really clobber performance. If you're really trying to
get good performance, especially over a narrow band, then you really
need to consider using tuned pipes (AKA "Expansion Chambers"). Gordon
Jennings "Two Stroke Tuners Handbook" covers most everything you need
to design a two-stroke.
4000 RPM is pretty low for a two-stroke. The tuned length for the
pipe(s) would be around 6 FEET.
Ship's two-stroke diesel engines top out at less than 200RPM.
I don't think they use tuned pipes, but if they did I suppose they'd
have room.
They are also supercharged. (forced induction)
|