[NSRCA-discussion] OS 140 EFI

Tue Aug 1 21:14:17 AKDT 2006

Ryan and all,

Yep, I have 2 140EFIs w/ NIB injectors sitting (and available cheap since
they've been sitting so long)  since I switched to the Webra 160s.

I ran the EFIs for 3 years, about 2,000 flights (several rebuilds).  A good
running well setup EFI is close to perfect for pattern use.  They are not as
versatile as the 140RX as the RX can be happily setup to run as low as 7400
and as high as 8800, while the EFI really only performs well at 8000 +/- 300
RPM.  I'm quite certain this has to do with the calibration range of the
"fuzzy" logic that the electronic fuel injection unit uses.  I switched to
the Webra for more midrange torque, and to get away from the injector
problems.

The injectors - my experience is that they actually will tolerate a soft
mount, so long as the soft mount only moves in rotation - any movement in
the mount that allows lateral displacement in the crankshaft will rapidly
(5-20 flights) destroy the injector.  And all injectors were not created
equal - some would crap out in 10-30 flights, and the ones that didn't
lasted 300-500 flights.  Yes, I went through a few injectors - and I never
paid for a single replacement - I bought my engines from Central, and
OS/GP/Hobbico replaced injectors no charge (albeit the turnaround time
ranged from 2 weeks to 3 months).  Supposedly, the last batch of injectors
were improved and much more durable - I can't confirm that as I haven't run
them.

The other "nuisance" with the EFI was the wiring for the injector and temp
and RPM sensors - they are susceptible to fatigue if not properly
routed/supported.  Not really a big deal.  FWIW - when I had a temp sensor
go bad, I knew it because the LCD display said "OR" (over-range) for the
temp reading - engine didn't run any differently.  RPM and fuel mixture
across the range didn't change, economy, idle, peak power didn't change,
hot/cold starting didn't change.  So on the other engine, I unscrewed the
temp sensor from the head (and left in plugged into the electronic control
unit) and it ran fine, and I unplugged the temp sensor from the unit, and it
ran fine, and when I plugged in back in, it ran fine.  I actually flew at
the NATs one year without the temp sensor as it had died and I couldn't get
a replacement in time.  The temp sensor was very useful tho for seeing
differences in needle settings and changes in cowl baffling.

Regards,

Dave

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From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Ryan Smith
Sent: Tuesday, August 01, 2006 5:39 PM
To: 'NSRCA Mailing List'
Subject: Re: [NSRCA-discussion] OS 140 EFI

Matt,

Not to bust your chops, but you may want to research what you say before you
say it. 

Firstly, the OS 1.40 EFI that Randy was referring to does not have an issue
with bearings going bad. They come stock with a sealed rear bearing, and
when someone refers to changing a bearing out on an RX, they're putting in a
bearing for the EFI. Also, I would wager to say that there are about the
same number of people using YS as there are using OS.

Back on track, what Mr. Michael said was correct. But to fill in a couple of
areas, the injectors go bad when used with a soft mount. If you use a
relatively stiff mount such as the Budd or Hyde 'A' mount, you shouldn't
have difficulties. I actually have two of them but have yet to use them in
anything. I will be flying one for sure in my next airplane, and if I build
a backup, it will have the other one in it. It is my understanding that the
EFI runs a lot more consistent, and has really good power. I would recommend
you talk to Eric Henderson; he seems to be the guru of OS fuel injected
engines. If you need to locate a few, it is my understanding that Dave
Lockhart has some that he may part with, and I hope he doesn't mind me
posting this on the list.

Take care all,

Ryan

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of R. LIPRIE
Sent: Tuesday, August 01, 2006 5:23 PM
To: randy10926 at comtekmail.com; NSRCA Mailing List
Subject: Re: [NSRCA-discussion] OS 140 EFI

Hey Glenn,

    The reason why is because. Lots of us use YS engines. And because the os
140s have a major bearing problem. You will have to change the bearing.

Matthew Liprie

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

From: Glenn <mailto:randy10926 at comtekmail.com>  Hatfield 

To: nsrca-discuss list  <mailto:nsrca-discussion at lists.nsrca.org> 

Sent: Tuesday, August 01, 2006 3:25 PM

Subject: [NSRCA-discussion] OS 140 EFI

Anybody have an opinion about the OS140 EFI?  I have seen very few being
used,  other than price is there a reason?

Randy

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