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need help to get engine running
Posted: Wed Jun 30, 2010 4:58 pm
by j king
Just finished building an atmospheric engine and it wont run. I happen to find this site trying to figure out what was wrong.Seems some fairly crude engines run..I am thinking it may be the timing but guessing..Will post a pic in a bit. Thanks Jim
Re: need help to get engine running
Posted: Thu Jul 01, 2010 9:07 am
by speedless
Hi
Looks like your right from the pics.180 degrees ?
No more guessing,timing should be 90 degrees.
Hint:Power piston in top,diplacer in middle pos.
Power piston in bottum,diplacer in middle pos.
Jan
Re: need help to get engine running
Posted: Thu Jul 01, 2010 11:14 am
by Junkie
The picture's not too clear, but it looks like the cranks are set at 180 degree as the other poster said.
Great work though, looks really well built.
Re: need help to get engine running
Posted: Thu Jul 01, 2010 3:27 pm
by j king
It is approx 90% from each other...Hmmm The balance is out. Are these fussy on that?
Re: need help to get engine running
Posted: Thu Jul 01, 2010 3:34 pm
by Junkie
Does it do anything when you apply heat (i.e piston moves a little)? What heat source are you testing it with ? Maybe try a more powerful one!?
Re: need help to get engine running
Posted: Thu Jul 01, 2010 7:41 pm
by jimlarsen
Your timing is off. You don't want 90%. You want 90 degrees, as in a right angle. If everything else is working right, it should run. But based on these pictures we can't make a judgement on the other important factors of balance, friction, and pressure leaks. Yes, balance is critical in a LTD design.
Jim Larsen
http://stirlingbuilder.com