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Old 06-09-2011, 04:16 AM
  #6  
summerwind
 
Join Date: Feb 2007
Location: fresno, CA
Posts: 3,987
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Default RE: test stand for breaking in 56Jett

listen to Bob, and others that have run high performance engines too.
a 9x6 is the prop to use for breakin on the bench.
you want it to run at almost the speed it will be running when in the air, only it'll be set in a rich setting allowing it to run in the piston/sleeve and rod surfaces at speed with the added lubrication it is getting by being rich.
around 10 3 minute runs is sufficient.
also can't stress using a Jett Bubble tank enough. the system just plain works perfect. no lean runs unless of course you try to get greedy with the needle.
i ran my 50 and 56 on these tanks and never lost a plug. as a matter of fact my 50 just got a new plug after breakin time and 10 flights in the air because it just finally got gray hair

seriously, do the bench time as laid out.........you'll be a happy camper later.