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Engine basics => Engine set up tips => Topic started by: Jim Pollock on August 08, 2006, 07:19:19 PM

Title: How do you tell.....
Post by: Jim Pollock on August 08, 2006, 07:19:19 PM

When a ST G.51 is getting tired and is in need of a new ring job??? ???

Jim Pollock  %^

Title: Re: How do you tell.....
Post by: Ron Merrill on August 08, 2006, 08:30:12 PM

Randy Smith were are you?????????? j1 Ron

Title: Re: How do you tell.....
Post by: RandySmith on August 09, 2006, 07:57:40 AM

Quote from: Jim Pollock on August 08, 2006, 07:19:19 PM

When a ST G.51 is getting tired and is in need of a new ring job??? ???

Jim Pollock  %^

HI Jim

The obvious  i s power  will be  down, you can also turn the engine over  slowly and tell  if it is  losing compression.
Turn the engine over very slow both clockwise and counter clockwise, your motor should have  much better seal turning it clockwise, if it leaks down fast in that direction  it needs a new ring or other parts (sleeve etc).
Don't load it up with oil while doing this

Regards
Randy

Title: Re: How do you tell.....
Post by: Jim Thomerson on August 14, 2006, 07:51:13 AM

Ran a K&B 40 in a Humongous for many, many flights, as time went on, I kept getting one flip starts, but the necessary prime kept increasing.  Replaced the ring and went back to a light prime and there was a noticeable increase in power.  The decrease in power with ring wear had been so gradual I had not noticed it.