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Elmer’s #3 part seven

It looks OK but reluctant to run

It looks OK but reluctant to run

Followers of this series of posts are probably wondering what has happened to my build of Elmer’s #3 Open Column Engine.  Well, whilst it looks to be ready to run it resolutely refuses to respond to the input of air. The crankshaft with inbuilt porting is clearly a critical item but despite making a replacement with extra care there is still no joy.

I have double checked all the porting and the reversing device but no real clues to its reluctance to perform. So, when time allows it will be a strip down and maybe a new bearing block – I will let you know !

Click on ‘More Posts’ below to see the final nail biting episode !

August 20th, 2009 | Tags: , | Category: Elmer's 'Open Column' #3 | Leave a comment

Elmer’s #3 part eight

Well today I managed to devote my attention to sorting out my non-running Open Column engine. The problem was resolved by remaking the main bearing block and the crankshaft, aiming for a very close fit. As the porting on this engine is by way of flats on the crankshaft a close fit is essential, almost to the point of tightness. This is to minimise  loss of pressure along the bearing bore. I am pleased, and relieved, to say the engine did run but required something like 40 p.s.i. to overcome the initial stiffness but after half an hour or so the engine was running fine on less than 10 p.s.i. and I think this will continue to reduce as the engine is run in.

You’ve read the book now see the video !

August 9th, 2009 | Tags: , | Category: Elmer's 'Open Column' #3 | 2 comments
 
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