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Author Topic: Ring end gap  (Read 1666 times)

Offline James Trevaskis

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Ring end gap
« on: January 27, 2019, 02:00:13 AM »
Can someone in the know tell me what the ring end gap should be in a Dykes ringed .35
                  Thanks gents      Jim.       
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Offline RandySmith

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Re: Ring end gap
« Reply #1 on: January 27, 2019, 10:43:19 PM »
IT depends  on MANY things, there is  no  1  answer, How much cross hatch is cut into the sleeve,  what is the sleeve made of?
Is it chromed or not?
does the sleeve have any taper?
The answer will vary from near  zero  to  4 thousands , it also will depend on roundness , and size of the  bore
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Offline James Trevaskis

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Re: Ring end gap
« Reply #2 on: January 29, 2019, 02:18:55 AM »
OK take no.2
It is a series 75 K&B shiney case  with a steel.790 bore ,no discernible taper with a moderate? factory cross hatch pattern.
  All parts are new old stock. Many thanks to those who have replied so far.
       Jim
 
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Offline James Trevaskis

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Re: Ring end gap
« Reply #3 on: January 30, 2019, 07:50:07 PM »
Thanks Mat, Lauri and Randy, I bought all the K&B left overs from a closing down hobby distributor a few years back here in Oz , there was enough parts to assemble 6-8 engines 3 of which are ringed .35s hence the original question.
   thanks again gents      Jim.
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Offline Air Ministry .

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Re: Ring end gap
« Reply #4 on: January 30, 2019, 09:58:56 PM »
They look pretty good motors , from he info on sceptre flight .

No left hand K&B crankshafts in your stash ? .  :-\ H^^
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Offline richardm

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Re: Ring end gap
« Reply #5 on: January 31, 2019, 02:39:03 AM »
Quote from: Matt Spencer on January 30, 2019, 09:58:56 PM
They look pretty good motors , from he info on sceptre flight .

No left hand K&B crankshafts in your stash ? .  :-\ H^^

The series 75 .35 is very well built but porky, nice castings and internals, bronze main bush, I replaced the ring 'cause some one else had broke it, it not well finished so taking tine to come in, I gapped to sliding fit no appreciable gap

Mine may end up in a 3 line of some sort, mebee a profile grumann guardian
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Richard Mc Fadden

Offline RandySmith

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Re: Ring end gap
« Reply #6 on: January 31, 2019, 07:24:42 PM »
Quote from: James Trevaskis on January 29, 2019, 02:18:55 AM
OK take no.2
It is a series 75 K&B shiney case  with a steel.790 bore ,no discernible taper with a moderate? factory cross hatch pattern.
  All parts are new old stock. Many thanks to those who have replied so far.
       Jim
 

Hi JIm

Given that,  If you want to break-in very careful, I would setup the  Ring gap  very tight  from .001 to almost zero  gap. You can turn it over by hand with light oil, in both directions very quickly for several minutes,  Then run it only a a bench  very sloppy rich for  1 to 3 minutes , Do this about  10 runs, Then start  to lean it a a Lean 4 stroke.  after a few more runs, pinch the  fuel tube  to let it burst 2 cycle for a couple of seconds,
Then last step, Run it into a  2 cycle  for  15 seconds  back to a 4 cycle, for 30 seconds and  repeat
 This will be the way to get a very good fit,  All  this based on a fairly good cross hatch but into the sleeve
Do NOt rush it
The main problem you may find is getting  rings that have less  than 5 to 12 thousands  gap...new

I would use  25 to 28%  oil with  1/2  synthetic  1/2  castor  oil

Randy
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Offline James Trevaskis

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Re: Ring end gap
« Reply #7 on: January 31, 2019, 10:05:44 PM »
Thanks gents, Randy I will do as you suggested with fuel and running in, I'm old school so not in any hurry to get it airborne.
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Offline James Trevaskis

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Re: Ring end gap
« Reply #8 on: February 04, 2019, 05:31:54 AM »
Matt I haven't been through all the bits yet but from memory there were some L/H cranks,now If you wanted a k&B /veco .19 backplate no worries I have cornerd the Oz market . What engine is it for ?
            Jim.
 
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Offline Air Ministry .

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Re: Ring end gap
« Reply #9 on: February 04, 2019, 09:42:54 PM »
Quote from: James Trevaskis on February 04, 2019, 05:31:54 AM
Matt I haven't been through all the bits yet but from memory there were some L/H cranks,now If you wanted a k&B /veco .19 backplate no worries I have cornerd the Oz market . What engine is it for ?
            Jim.
 

Youll have to see if the 19 backplates fit the FP's ! ( Theyd be to short though  :( )

Quote
What engine is it for ?

A OS 35 .  :) LL~ or maybe Enya ! .  The K&B 40 or 35 one would likely ' go in ' .
The 75/35 is 1/2 in - 12.7 mm Vs the OS at 12 mm . so only need a large hammer to fit it .

 ;)


Lengths look vaugely right , and would ' stroke ' it a tad . If theres a Left & Right PAIR , it might make more sense for me to do a pair .
Enya 5224 & 35 C as back up . Need a left hand 35 ish .  :( :P Thanks .
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Offline James Trevaskis

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Re: Ring end gap
« Reply #10 on: February 07, 2019, 11:05:10 PM »
Apologies Motorman
                           so I would also thank Motorman for his contribution too my post. 
                               JimT.
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