GM 1-71 generator video

[fattywagonman]

http://youtube.com/watch?v=MTPkeXvJ_HQ&mode=related&search=

[mobile_bob]

i love it!

but of course i have "alpine" green in my blood 

bob g

[hotater]

Check out THIS genset!

http://youtube.com/watch?v=NBLkNxRzwmo&mode=related&search=

[aqmxv]

I'm so used to DD two-strokes growling or howling.  Putt-putting is kind of strange by comparison.  I'd have liked to see a walkaround, hear startup, etc.  Neat piece, though, and the first one I've ever seen even recent photos of.

[t19]

That would drive me nuts... to much put put put

[biobill]

  Another blatant display of ignorance
     
     How do two stroke diesels work or more specifically how do they charge the cylinder with air since (I believe) it's not pumped up from the crankcase. Is there an intake valve or is it all ports? I'm too old not to know this stuff.

                                                  Bill

[mobile_bob]

it uses a roots blower to move air thru the airbox section of the block and thru the ports in the liner when the piston is at bdc
there are no intake valves only exhaust's,
not sure but i think the 1/71's are old enough to have been 2 valve heads, but may have been 4 valve like their newer and larger brothers

bob g

[biobill]

Ahhh now I get it, it's supercharged. So at BDC intake ports and exhaust valves are open and the pressurized air scavenges the cyl. I looked at the video again, Where do they hide the blower and the intake?

[aqmxv]

actually...no.  It's not really supercharged.  The blower is better called a scavenge blower.  There probably is a small place in the run cycle where the exhaust is closed and the intake is still open, but if it's like the old two-stroke diesels I've seen, you're talking about less than 10 PSI of boost, probably less than five.  Roots blowers are horribly inefficient as compressors for all that they're good pumps...

As to where the blower is - it should be on the opposite side of the engine where we never see...  Anybody got engineering drawings of one of these things?  I've seen plenty of the bigger DD engines, but when they get this little...jeez, the blower must be the size of a toaster.

[xyzer]

Cool ! Did you see the block-o-cement they got that stationary engine mounted to?
Dave