[NSRCA-discussion] Venus Engine Question

Fri Jul 4 08:29:57 AKDT 2008

I'm not sure you can extend one of the holes into the crankcase on an OS120 Ax. Be careful. The reason you can do that on the OS160 Fx is because that engine also came in a fuel-injected version. The casting was designed to allow one of the backplate bolt holes to be drilled in the manner you described. I don't think the 120 is the sme in this regard. I just recently tapped an OS91 backplate because it had no way of drilling one of the bolt holes so that it accessed the crankcase. I used the 6-32 fitting that comes with the Perry pump. I drilled the hole exactly in the center of the backplate - the pressure tap extends just slightly past the surface but it won't hit anything (crank, rod) if you put it right in the center of the backplate. I haven't tapped a 120 yet but it may (or may not) be the same as the 91. I've seen some OS engines with a boss cast into the backplate so that you can easily install a pressure tap. Not sure how the 120 is. Let us know what you end up doing and how it works out.

If you end up using the OS 120, pick up one of the Fuel-Injected OS 140 Rx rear bearings and install it in the 120 before you start it. You won't have any bearing problems if you do this. If you can't find a Fuel-Injected 140 bearing, purchase a double sealed, stainless steel rear bearing for your 120 from Boca Bearings.

John Pavlick
http://www.idseng.com
  ----- Original Message ----- 
  From: J N Hiller 
  To: General pattern discussion 
  Sent: Friday, July 04, 2008 11:53 AM
  Subject: Re: [NSRCA-discussion] Venus Engine Question

  Thanks all for the info. I believe I will go with the Perry. Adding a pressure tap to the back plate is not a problem but I may get the special back plate screw the 1.40 uses and extend one of the holes in the crankcase. I may try it without the pump first but suspect the transition may lag. I am ironing on the paint while waiting for the backordered pipe.

  Jim H.

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of george w. kennie
  Sent: Friday, July 04, 2008 7:01 AM
  To: jpavlick at idseng.com; General pattern discussion
  Subject: Re: [NSRCA-discussion] Venus Engine Question

  I once installed a Kline in my Focus which had a 150 2 Stroke in it and the pressure generated by that particular engine was too high, causing the thing to load up, so I installed an after-market needle valve in the pressure line and adjusted the available pressure to the tank and it seemed to work quite well.

  G. 

  ----- Original Message ----- 

  From: John Pavlick 

  To: General pattern discussion 

  Sent: Thursday, July 03, 2008 1:25 PM

  Subject: Re: [NSRCA-discussion] Venus Engine Question

  The Perry doesn't require the tank to be pressurized like the Kline does. On the other hand, I believe the Kline can be run with muffler pressure to the tank whereas the Perry needs crankcase pressure to the pump. This can be a pain if you don't feel like tapping the backplate of your engine. Either system can work very well or very poorly. You'll find that people will swear by either one but not necessarily both. I personally have had better luck with the Perry so that's what I use. 

  John Pavlick

  J N Hiller <jnhiller at earthlink.net> wrote:

  Jay, how does the Perry pump compare to a Kline?

  Jim Hiller

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Jay Marshall
  Sent: Thursday, July 03, 2008 7:27 AM
  To: 'General pattern discussion'
  Subject: Re: [NSRCA-discussion] Venus Engine Question

  I used the Perry VP-30 and an APC  15-10 prop.

  Jay Marshall 

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of William C. Harden
  Sent: Thursday, July 03, 2008 9:55 AM
  To: 'General pattern discussion'
  Subject: Re: [NSRCA-discussion] Venus Engine Question

  Thanks.  What prop are you using and what is the Perry Pump model number that you are using?

  Bill

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

  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Jay Marshall
  Sent: Thursday, July 03, 2008 8:34 AM
  To: 'General pattern discussion'
  Subject: Re: [NSRCA-discussion] Venus Engine Question

  I added ½ oz. It will depend how heavy your servos are. I used a different fuel tank and moved it back to the wing tube to keep the CG constant. This necessitated a Perry pump.

  Jay Marshall 

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of William C. Harden
  Sent: Thursday, July 03, 2008 9:16 AM
  To: 'General pattern discussion'
  Subject: Re: [NSRCA-discussion] Venus Engine Question

  Jay,

  Did you have to add weight to the tail to balance the plane?  If so, how much weight did you add?

  Bill

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

  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Jay Marshall
  Sent: Thursday, July 03, 2008 6:53 AM
  To: 'General pattern discussion'
  Subject: Re: [NSRCA-discussion] Venus Engine Question

  I use the stock muffler. The engine is mounted so that the muffler is at the bottom of the fuse. This puts the head at appx 8 o'clock.

  Jay Marshall 

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of William C. Harden
  Sent: Wednesday, July 02, 2008 10:20 PM
  To: 'General pattern discussion'
  Subject: Re: [NSRCA-discussion] Venus Engine Question

  Jay, 

  Are you using the stock muffler on the AX or something different?

  Bill

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

  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Jay Marshall
  Sent: Wednesday, July 02, 2008 7:24 PM
  To: 'General pattern discussion'
  Subject: Re: [NSRCA-discussion] Venus Engine Question

  Sound doesn't win! Go with the AX - lots more power, more reliable. (I have both - and a Venus)

  Jay Marshall 

  -----Original Message-----
  From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Terry Beachler
  Sent: Wednesday, July 02, 2008 8:19 PM
  To: nsrca-discussion at lists.nsrca.org
  Subject: [NSRCA-discussion] Venus Engine Question

  Hi Flyers,

  I am planning to build a Venus II. The OS 120AX is suggested and also O.S. 120 Surpass 4C. Any thoughts from the group on choice. I'll be flying Sportsman. My buddy goofy Bob Wilson leans toward the 120AX. I am somewhat partial to 4 strokes. I like that V-8 sound and low end torque.

  Terry Beachler

  Buzz jobs should be targeted to the windsock at: N 40 49.944 W 89 33.230

  Visit the PRCM web site at: www.peoriarcmodelers.com 

  Map link to old field: http://tinyurl.com/5wys9l 

  Map link to new field: http://tinyurl.com/29b7gm 

  Four Star Racing Series: http://fourstarracingseries.com 

  _______________________________________________
  NSRCA-discussion mailing list
  NSRCA-discussion at lists.nsrca.org
  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

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

  _______________________________________________
  NSRCA-discussion mailing list
  NSRCA-discussion at lists.nsrca.org
  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion

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

  I am using the free version of SPAMfighter for private users.
  It has removed 10728 spam emails to date.
  Paying users do not have this message in their emails.
  Try SPAMfighter for free now!

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

  _______________________________________________
  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/20080704/fcd3e3ab/attachment-0001.html>