[NSRCA-discussion] YS points of interest

Tue Oct 20 06:41:27 AKDT 2009

The cam lubrication is interesting, as well as helpful..  The highest unit loading in the usual poppet valve engine, is at the cam/lifter junction.  (Remeber the old phonograph with the needle; the unit loading at the tip of the needle was as much as 5,000 # psi.)
Bill Glaze
  ----- Original Message ----- 
  From: Koenig, Tom 
  To: 'General pattern discussion' 
  Sent: Tuesday, October 20, 2009 12:56 AM
  Subject: Re: [NSRCA-discussion] YS points of interest

  Thanks Chris, but its hardly worth an article????...... I'm far from a YS genius. I have come across a few in my time however.....just look for the guys with the blown off props and spinners, deadsticks and always  're-tuning' their motor (usually in the pits). Nothing scares me more than some peanut 'tuning' a YS at full song in the pits!!

  I'm sure we all know these experts ...trust me...they exist, even down here!!! But funnily, the guys that couldnt get a YS to run are now also having trouble with electric. Interesting? hehehehehehehehehe

  Now the CDI....keep those Boxes cool. It MAY help....but the CDI is another story which I am only just learning to read!

  Maybe I'll take a few pics and scribble something about what I do...

  Tom

------------------------------------------------------------------------------
  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of krishlan fitzsimmons
  Sent: Tuesday, 20 October 2009 2:01 PM
  To: General pattern discussion
  Subject: Re: [NSRCA-discussion] YS points of interest

  Good tip's Tom!

  Would make a nice Kfactor article. hint hint 

  Chris 

------------------------------------------------------------------------------
  From: "Koenig, Tom" <Tom.Koenig at actewagl.com.au>
  To: NSRCA <nsrca-discussion at lists.nsrca.org>
  Sent: Mon, October 19, 2009 6:49:33 PM
  Subject: [NSRCA-discussion] YS points of interest

  Hi all,

  Just a little topic diverter, for all us 'oilers'.

  Some background. Generally in Aus, most people mix their own fuel as it is simply too cost prohibitive to use pre-mix. 99.9% use the Coolpower oils. We have the three types available; Blue (SV), Red (LV) and Purple(MV).

  I have just rebuilt 3 different YS motors,all running on different oils. Nitro content is 25-30% depending on motor and application, Nitro brand is VP. The  methanol was Spectro C analysed for purity and water content ( perfect results)

  I have found: ( your mileage may vary <VBG>)

  The LV oil produces marginally ( empirically tested) power, however significant corrosion and wear was found in the motors using this oil. Cam was badly worn also.

  The standard Blue oil motor had by far the least wear, virtually no corrosion and only small expected, standard wear ( liner, bearing play and ring gaps. Cam was perfect)

  The MV oil, which as expected, was somewhere in between the two.

  Conclusion for my own future use:

  I will cease to use the Heli oil in my motors as of now, unless I need to milk a motor for every last bit of power OR if I am happy to rebuild more often.

  The MV does seem like a good compromise, but I'm happy with the Blue oil. Its the original, and in my opinion only, still the best general performing oils of all.

  Also-IF any of you are actually still using the YS, here are a few other tips. I have two brand new 170's-one CDI and one Glow. Both motors had virtually NO oil in the cam area out of the box. I would recommend that you open the cam cover and squirt it full of oil before you start these for the first time. I feel it helps and may just prevent undue cam wear.

  I always strip, rework and Ultra sonically clean my motors before I run them-so I do this anyway, but for those that don't want to go to these extents-The oiling of the cam is easily done.
  Another little tip-lap the valves in. I just use one of those eraser tipped pencils, cyno'd to the valve, and then spin the pencil with some fine valve grinding paste on the seat. This works a treat, every time.( obviously, disassemble the head first)

  Now feel free to practice those snaps that we talked about ,with that little powerhouse of an engine <G>

  Tom

------------------------------------------------------------------------------
  ************************************************************************
  *PLEASE NOTE* This email and any attachments may
  be confidential. If received in error, please delete all
  copies and advise the sender. The reproduction or
  dissemination of this email or its attachments is
  prohibited without the consent of the sender.

  WARNING RE VIRUSES: Our computer systems sweep
  outgoing email to guard against viruses, but no warranty
  is given that this email or its attachments are virus free.
  Before opening or using attachments, please check for
  viruses. Our liability is limited to the re-supply of any
  affected attachments.

  Any views expressed in this message are those of the
  individual sender, except where the sender expressly,
  and with authority, states them to be the views of the
  organisation.
  ************************************************************************

------------------------------------------------------------------------------
  ************************************************************************
  *PLEASE NOTE* This email and any attachments may
  be confidential. If received in error, please delete all
  copies and advise the sender. The reproduction or
  dissemination of this email or its attachments is
  prohibited without the consent of the sender.

  WARNING RE VIRUSES: Our computer systems sweep
  outgoing email to guard against viruses, but no warranty
  is given that this email or its attachments are virus free.
  Before opening or using attachments, please check for
  viruses. Our liability is limited to the re-supply of any
  affected attachments.

  Any views expressed in this message are those of the
  individual sender, except where the sender expressly,
  and with authority, states them to be the views of the
  organisation.
  ************************************************************************

------------------------------------------------------------------------------

  _______________________________________________
  NSRCA-discussion mailing list
  NSRCA-discussion at lists.nsrca.org
  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20091020/d8e08a0c/attachment.html>