IO-360 Run-on

Jerry Cochran · #1 06-09-2008, 02:55 PM

Folks,

Hope some smart people here can help me. I flew from NW Oregon to Santa Rosa, CA today. First, I stopped along the way and upon departure, engine seemed rough while taxiing even tho I leaned it. Upon runup, seemd fine, so took off, cruised down here at 11,500, everything good. However, upon shutdown here, the engine did not want to quit, just kept chugging along firing about once per revolution. It being 90F deg here may have something to do with it, but I've been in hot wx before with Lycs and never saw this.

This is a Superior IO-360 fuel injected of course, horizontal intake.

Anyone with knowledge of this phenomenon? I've seen this in cars before fuel injection but never in an aircraft of any kind.

Thanks,

Jerry

LifeofReiley · #2 06-09-2008, 03:43 PM

Quote:

Originally Posted by Jerry Cochran

Folks,

Hope some smart people here can help me. I flew from NW Oregon to Santa Rosa, CA today. First, I stopped along the way and upon departure, engine seemed rough while taxiing even tho I leaned it. Upon runup, seemd fine, so took off, cruised down here at 11,500, everything good. However, upon shutdown here, the engine did not want to quit, just kept chugging along firing about once per revolution. It being 90F deg here may have something to do with it, but I've been in hot wx before with Lycs and never saw this.

This is a Superior IO-360 fuel injected of course, horizontal intake.

Anyone with knowledge of this phenomenon? I've seen this in cars before fuel injection but never in an aircraft of any kind.

Thanks,

Jerry

Need more info... EI or mags? What FI system are you running? Do you have CHT readings?

zman · #3 06-09-2008, 05:14 PM

Great engine... I have the same on my RV-8. If you have a RSA-5 or RSA-10 series Fuel Injector Servo from Precision Airmotive LLC (360) 651-8282 www.precisionairmotive.com.

There is a service bulletin PRS-107 that needs to be complied with...check your serial# from the Superior web site.

Check the mixture at the servo for proper ajustment. The tech guy's at airmotive are smart and really helpful.

Hope this will get you started in the right direction.

Zman.

steveKs. · #4 06-09-2008, 05:38 PM

My RV8 did the same thing. Ran rich, flooded easily and finally the idle cutoff wouldn't quite ....cut off. The same exact problem you had, ran crappy on the ramp and had to lean it out to idle. Ran great when the lever went forward.

I was ready take it to the shop. Then.......the problem went away. Works great now, weird huh? Probably some piece of debri stuck somewhere.

Jerry Cochran · #5 06-09-2008, 06:59 PM

Quote:

Originally Posted by LifeofReiley

Need more info... EI or mags? What FI system are you running? Do you have CHT readings?

Mags, engine only has 100+ hrs., Silver Hawk FI, CHT's during flight very normal. Did not notice them during problem.

Thanks,
Jerry

Jerry Cochran · #6 06-09-2008, 07:02 PM

Quote:

Originally Posted by zman

Great engine... I have the same on my RV-8. If you have a RSA-5 or RSA-10 series Fuel Injector Servo from Precision Airmotive LLC (360) 651-8282 www.precisionairmotive.com.

There is a service bulletin PRS-107 that needs to be complied with...check your serial# from the Superior web site.

Check the mixture at the servo for proper ajustment. The tech guy's at airmotive are smart and really helpful.

Hope this will get you started in the right direction.

Zman.

Yes, that SB was checked and does not appy, but looked at it anyway, no problem. I will check the mix control, just wish I was home with my tools.

Thanks, gotta luv this forum.
Jerry

LifeofReiley · #7 06-09-2008, 08:12 PM

Quote:

Originally Posted by Jerry Cochran

Yes, that SB was checked and does not appy, but looked at it anyway, no problem. I will check the mix control, just wish I was home with my tools.

Thanks, gotta luv this forum.
Jerry

I would consider the FI, but as you've stated this problem just came to light. I take you did not have this problem prior to this event. Check the mag wiring and leads for proper connection. It's hard for a engine to keep trying to run without spark or extreme heat.

mahlon_r · #8 06-10-2008, 05:14 AM

Remove the hose that goes to the flow divider. Put the mixture
control in idle cutoff and turn the boost pump on. Observe any
leakage at the hose you disconnected. Anything more then a drip every
couple of seconds, you need new mixture plates in the servo. If the
hose shows no leakage then you may need to get the flow divider
cleaned out, as something may be preventing the piston, in it, from
getting full travel.
Also, make sure any of the air bleeds on the fuel nozzles aren't
blocked. Do this by blowing into one end of the nozzle with your
mouth and your finger blocking the outlet. The air you blow in should
then come out the nozzles air bleeds. If one seems restricted, that
could be you problem.
If you have manual primer it could be leaking.
Good Luck,
Mahlon
"The opinions and information provided in this and all of my posts
are hopefully helpful to you. Please use the information provided
responsibly and at your own risk."

Jerry Cochran · #9 06-10-2008, 10:13 AM

Quote:

Originally Posted by mahlon_r

Remove the hose that goes to the flow divider. Put the mixture
control in idle cutoff and turn the boost pump on. Observe any
leakage at the hose you disconnected. Anything more then a drip every
couple of seconds, you need new mixture plates in the servo. If the
hose shows no leakage then you may need to get the flow divider
cleaned out, as something may be preventing the piston, in it, from
getting full travel.
Also, make sure any of the air bleeds on the fuel nozzles aren't
blocked. Do this by blowing into one end of the nozzle with your
mouth and your finger blocking the outlet. The air you blow in should
then come out the nozzles air bleeds. If one seems restricted, that
could be you problem.
If you have manual primer it could be leaking.
Good Luck,
Mahlon
"The opinions and information provided in this and all of my posts
are hopefully helpful to you. Please use the information provided
responsibly and at your own risk."

Mahlon,

Thanks so much, I was hoping you might weigh in. No manual primer and engine ran beautifully in cruise for 2.5 hrs with normal EGT's and CHT's. Do you suppose this is mainly an issue at idle? That's the only time I noticed symptoms. This engine is only a year old with 100+ hrs. Wouldn't it be unusual to need new mixture plates so soon?

Regards,

Jerry

steveKs. · #10 06-10-2008, 10:23 AM

Don't they 'lap' the mixture plates (true them up to each other)? When my 360 had this problem I figured this was what needed to be done.
Since the problem solved itself, I am thinking that maybe a piece of debri got between the plates and finally dislodged.
Does this make any sense??

http://aeromanuals.info/bendix-troub...rough-shutdown

http://www.sacskyranch.com/rsafuelt.htm