[NSRCA-discussion] Venus Engine Question

Fri Jul 4 10:37:26 AKDT 2008

I pulled the back plate yesterday to see where an extended mounting hole
would enter the crankcase. It looks like it would enter on the radius below
the sleeve from either upper mounting hole or into the bypass port opposite
the exhaust. The backplate has a boss in the center thick enough to tap, no
problem. I have nearly 1 3/8" from the backplate to the firewall but I may
go with the recessed backplate location to prevent a tight radius bend in
the fuel line.
Bearings! I have changed a few and the problem appears to be corrosion
related from day one using an open bearing. Last year I replaced the rear
bearing with a standard sealed bearing from the bearing store and left the
seals on. It ran nice all summer before going bad. When I changed it I
pulled the seal to see what happened. It was quite dry with no trace of
factory lubricant. Evidently the glow fuel got through the seals, flushing
it. I disassembled the bearing and the components were not pitted badly as
one would expect due to corrosion. It just looked worn, mostly on one side
of the outer race, probably the bottom receiving the load.
After reading in an earlier post that the 140 bearing is the same size I
checked Tower and they appear to have it. The photo shows a red side as if
the seal material is silicone based, probably more compatible with glow fuel
than the black seal material used in standard bearings. (OS Rear Bearing
140CF, OS # 29430010, Tower # LXWY09) They don't say it is a stainless
bearing but the OS part number matches the parts drawing on the OS website.
I guess I need to order a couple.
Thanks again for the info.
Jim H.

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of John Pavlick
Sent: Friday, July 04, 2008 9:28 AM
To: General pattern discussion
Subject: Re: [NSRCA-discussion] Venus Engine Question

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 <mailto:jnhiller at earthlink.net>
To: General pattern discussion <mailto:nsrca-discussion at lists.nsrca.org>
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 <mailto:jpavlick at idseng.com>

To: General pattern discussion <mailto:nsrca-discussion at lists.nsrca.org>
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

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