[NSRCA-discussion] OS 140RX rough and inconsistent idle
Nat Penton
natpenton at centurytel.net
Mon Jun 26 18:31:23 AKDT 2006
Ed
The seals start dragging ( couple of hundred flights ) on a stainless bearing in the 91FX. Removed the seals and lived happily ever after.
----- Original Message -----
From: Ken Velez
To: NSRCA Mailing List
Sent: Monday, June 26, 2006 8:30 PM
Subject: Re: [NSRCA-discussion] OS 140RX rough and inconsistent idle
Ed I have experienced the same , bearing was the solution. I know also Steve Miller has experienced this as well and the same solution, bearing.
Ken
----- Original Message -----
From: Rick Wallace
To: nsrca-discussion at lists.nsrca.org
Sent: Monday, June 26, 2006 9:13 PM
Subject: Re: [NSRCA-discussion] OS 140RX rough and inconsistent idle
Ed -
two thoughts on bearings -
1. I've heard from others that a worn front bearing can be the cause of idle problems - has that one been changed lately?
2. rear bearings - I've not had real success w/ any bearing other than an OS EFI bearing installed just as it comes out of the bag - don't know how long they last because both engines are on their second or third season on the same rear bearing... Stock bearing, aftermarket stainless, Boca's of various flavors all had finite - and short- lives in my engines ...
It'll be great to see you on the flight line in Muncie!
Rick
--------------------------------------------------------------------------
From: "Ed Miller" <edbon85 at charter.net>
Reply-To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Subject: Re: [NSRCA-discussion] OS 140RX rough and inconsistent idle
Date: Mon, 26 Jun 2006 13:56:41 -0400
Thanks, looked at that so far when I removed engine, all looks normal. Taking the engine apart in an hour or so.
Yes, I'll be getting fuel from Scott Thursday. I figured this was better than cramping you guys on the trip out to Muncie. I'll call you tonight.
Ed.
----- Original Message -----
From: DaveL322 at comcast.net
To: NSRCA Mailing List
Sent: Monday, June 26, 2006 1:39 PM
Subject: Re: [NSRCA-discussion] OS 140RX rough and inconsistent idle
Ed,
Long shot - but double check throttle servo mount/linkage, and mounting of engine, softmount, nosering, pipe, etc - any of that stuff gets loose, funny things can happen.
Anderson should have fuel for you.
Dave
-------------- Original message --------------
From: "Ed Miller" <edbon85 at charter.net>
> Have an OS 140RX that has developed a rough and inconsistent idle. Engine
> runs perfectly except for idle. It has a Mintor head with either an OS F or
> K&B 1L in center plug and an OS A5 in the angled plug position, a Perf Spec
> AAC piston/liner assembly and a Boca sealed SS rear bearing. I have the head
> mounted with angled plug towards the front or carb side of engine. Fuel is
> S&W 20 nitro, 16 synthetic and 2 castor. Engine has 7 gallons of fuel run
> through it. Prop is an APC 15.75 x 11 3 blade by Dave Lockhart. The lowest
> I can get the idle before it quits is 1900 ~ 2000 rpm and it is rough,
> sounds like it is firing every other revolution. Idle mixture screw is
> working, I can richen idle to poi! nt wher e engine will barely transition from
> being rich and I can lean mixture so the transition is fine but engine slows
> at idle like it is too rich. While it is slowing with either the idle
> mixture screw lean or rich, engine is rough, again like it often fires every
> other revolution at times. I used to be able to reliably idle this engine at
> 1300 rpm. I have a second OS 140RX set up exactly the same except it doesn't
> have the AAC piston/liner and it runs/idles perfectly. Tried cleaning the
> carb/spray bar with no change. I once had a Super Tiger that exhibited
> similar characteristics due to a worn out con rod. Is it possible the con
> rod on this OS could cause this issue ?? Any suggestions will be greatly
> appreciated.
> Ed M.
> _______________________________________________
> NSRCA-discussion mailing list
> NSRCA-discussion at lists.nsrca.org
> http://lists.nsrc! a.org/m ailman/listinfo/nsrca-discussion
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