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General control line discussion => Open Forum => Topic started by: sadams714441 on April 05, 2006, 07:08:34 AM

Title: Plugs
Post by: sadams714441 on April 05, 2006, 07:08:34 AM

What is a good plug to use with a Brodak 40 and LA 40

Title: Re: Plugs
Post by: Bill Little on April 05, 2006, 07:23:09 AM

Any good "hot" plug. 

Thunderbolt is the choice around here for many. 

"Hot", R/C, or 4 cycle plugs.

Title: Re: Plugs
Post by: sadams714441 on April 05, 2006, 07:29:53 AM

Thanks Bill I'll check hobby store today.  Getting ready to break both engines in.

Title: Re: Plugs
Post by: Bill Little on April 05, 2006, 07:35:29 AM

Quote from: sadams7144 on April 05, 2006, 07:29:53 AM

Thanks Bill I'll check hobby store today.  Getting ready to break both engines in.

Just be sure to replace the plugs AFTER you get them broken in.  I have been told by a few engine builders in the past to do so, and I have found out first hand that they were correct.   I have seen a few engines go sour at just the wrong time if the break in  plugs were not replaced. 

I have a few plugs that I use just for break in, then put a new plug in for the first flight.  If the plug goes sour on the "ground", no problem.  Cheap insurance.

Title: Re: Plugs
Post by: john e. holliday on April 05, 2006, 04:39:49 PM

Why is that?  I just had a plug die on me sometime between the 10th and 11th flight.  I had to replace the plug on the RO-Jett before I could make 11th flight.  I use Fox idle bar plugs.  DOC Holliday

Title: Re: Plugs
Post by: Russell Shaffer on April 05, 2006, 06:58:11 PM

I am guessing, but there could be some metal particles floating around the combustion area during the break in period?

Title: Re: Plugs
Post by: RandySmith on April 05, 2006, 07:04:55 PM

Yes Right your  are  Russell

Also the plug sometimes takes a beating in breakin.
I have seen the elements kncked sideways  in engines  many times  during the  breakin

Randy

Title: Re: Plugs
Post by: Bill Little on April 05, 2006, 07:09:31 PM

AFAIK,  it is from what Russell says.  Gunk from breakin prematurely fouling the plugs.  I hope Randy Smith chimes in on this one.  I just do what I'm told most of the time.   ;)
I'm good at learning and remembering.  I don't theorise, or investigate!  The really smart guys do all that for me.  ;D

EDIT:  Well, as I was typing, Randy DID chime in!