OS .91 FX Inverted Install ?
01-12-2008, 04:56 PM
#1
Senior Member
Thread Starter
Join Date: Oct 2004
Location: Sierra Vista,
AZ
Posts: 288
Likes: 0
Received 0 Likes
on
0 Posts
OS .91 FX Inverted Install ?
I installed my new OS 91FX in the inverted orientation. I havent run it yet but some guys who are running them inverted told me that it will be problematic regarding it loading-up and low RPM / Idle. They say that if you idle too long in flight that it'll load up and quit. Apparently, the only way they can get theirs to run reliably is to use an on-board glow driver.
It this true with the .91 mounted inverted ? Cant I compensate with the low-end needle adjustment to prevent loading-up ?
Now I'm paranoid [X(]
Any tips are appreciated -
Thanks, Eric
It this true with the .91 mounted inverted ? Cant I compensate with the low-end needle adjustment to prevent loading-up ?
Now I'm paranoid [X(]
Any tips are appreciated -
Thanks, Eric
01-12-2008, 05:22 PM
#2
Senior Member
RE: OS .91 FX Inverted Install ?
Not to worry, I have had mine 91 FX inverted with no issues at all. In fact nearly all my engines are inverted, two and fourstrokes. If you adjust the needles properly and the tank is at the correct height you will be fine. Mine will idle forever and transition into wot with no problem at all.
I have never even owned an on board glow device
It is however more easy to overprime and get a hydrolock when it is inverted because all the fuel gathers at the top of the sylinder when its hanging upside down, so be careful when trying to fire it up. If it loads up once it runs, you have not adjusted the needles correctly
I have never even owned an on board glow device
It is however more easy to overprime and get a hydrolock when it is inverted because all the fuel gathers at the top of the sylinder when its hanging upside down, so be careful when trying to fire it up. If it loads up once it runs, you have not adjusted the needles correctly
01-13-2008, 06:49 PM
#4
Senior Member
Thread Starter
Join Date: Oct 2004
Location: Sierra Vista,
AZ
Posts: 288
Likes: 0
Received 0 Likes
on
0 Posts
RE: OS .91 FX Inverted Install ?
I flew my inverted .91FX today in an ARF P-51 Mustang and it ran perfectly. I did the normal adjustments and got the low end needle set for good low-high transition. No flameouts at extended idle..... Life is good 
Eric
Eric
01-13-2008, 07:04 PM
#5
Senior Member
My Feedback: (14)
RE: OS .91 FX Inverted Install ?
ORIGINAL: asmund
Not to worry, I have had mine 91 FX inverted with no issues at all. In fact nearly all my engines are inverted, two and fourstrokes. If you adjust the needles properly and the tank is at the correct height you will be fine. Mine will idle forever and transition into wot with no problem at all.
I have never even owned an on board glow device
It is however more easy to overprime and get a hydrolock when it is inverted because all the fuel gathers at the top of the sylinder when its hanging upside down, so be careful when trying to fire it up. If it loads up once it runs, you have not adjusted the needles correctly
Not to worry, I have had mine 91 FX inverted with no issues at all. In fact nearly all my engines are inverted, two and fourstrokes. If you adjust the needles properly and the tank is at the correct height you will be fine. Mine will idle forever and transition into wot with no problem at all.
I have never even owned an on board glow device
It is however more easy to overprime and get a hydrolock when it is inverted because all the fuel gathers at the top of the sylinder when its hanging upside down, so be careful when trying to fire it up. If it loads up once it runs, you have not adjusted the needles correctly
------------------
What Asmund said.
Going to a glow plug one increment hotter can help too.
Ed Cregger
01-13-2008, 07:36 PM
#6
Senior Member
Thread Starter
Join Date: Oct 2004
Location: Sierra Vista,
AZ
Posts: 288
Likes: 0
Received 0 Likes
on
0 Posts
RE: OS .91 FX Inverted Install ?
Ed,
Can you recommend a glow plug for me. I typically use the Fox std plugs in my glow engines and they seem to work OK but maybe there is something better I could use.
Let me know what ya think -
Thanks, Eric
Can you recommend a glow plug for me. I typically use the Fox std plugs in my glow engines and they seem to work OK but maybe there is something better I could use.
Let me know what ya think -
Thanks, Eric
