I'm new to 2-strokes. When I test compression on any four stroke engine, I open the intake/throttle so it can quickly and easily get a full air charge into the engine.
I was reading through the Grubee Skyhawk manual, and the procedure given there for a compression test says to seal both the intake and exhaust.
This makes sense for a leakdown test of course, but it says the same for doing the compression test.
I guess this makes sense. We're just working with whatever volume of air is in the cylinder after the rings close the transfers I guess.
Without me thinking too hard about this tonight, is this how you usually test compression on a two stroke?
How different will the numbers be if I leave the exhaust and intake open to the atmosphere when testing?
I don't have plates made up to seal the ports, so I was just curious if I tried to test compression the way I usually would on a 4-stroke would my numbers be useful and comparable...
Thanks!
I was reading through the Grubee Skyhawk manual, and the procedure given there for a compression test says to seal both the intake and exhaust.
This makes sense for a leakdown test of course, but it says the same for doing the compression test.
I guess this makes sense. We're just working with whatever volume of air is in the cylinder after the rings close the transfers I guess.
Without me thinking too hard about this tonight, is this how you usually test compression on a two stroke?
How different will the numbers be if I leave the exhaust and intake open to the atmosphere when testing?
I don't have plates made up to seal the ports, so I was just curious if I tried to test compression the way I usually would on a 4-stroke would my numbers be useful and comparable...
Thanks!