Author: "Andrew (Andy) N. Duncan" <Andy_Duncan@...> Time: Tue Dec 28, 2004 2:52 pm PST Link
We have an 2001 RV6A with an O-320 from Aerosport. Since we bought
the plane at 340 hours we have experienced periods of rough running
and occasional severe hesitations. We now have 500 hours on the engine
and it just gets worse and worse.
About 100 hours back we sent the carb back to AeroSport for service
and put in new Autolight plugs - the plane ran smoothly for about an
hour then the problem continued. We have just rebuilt the mags
(slicks), tested the harness (Precision in Portland), replaced all
plugs with Champions, and done the wobble test (everything well within
specs), and checked out the fuel pump and filters.
Immediately after service the plane ran fairly well for a couple of
hours then the roughness returned. Problems tend to be intermittent
but there seem to be a few "reproducable" situations. On climbout at
full throttle it often starts running rough after a couple of minutes
-- often coughing badly as you are turning crosswind or downwind
(scary) - but it smooths out somewhat if you reduce the RPMs to 2 -
2.2k
On cruise it will run smooth as silk for long periods - however, on
descent, when you decrease rpm by a couple of hundred it will run very
rough hesitating badly(not carb ice - heat makes no difference) - or
if you push the thottle in it runs rough -- not fun if you are doing
a go-round.
We and our local A&P have run out of ideas . . . Any suggestions ???
Thanks Andy N829RW
------------------------ Yahoo! Groups Sponsor --------------------~-->
Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar.
Now with Pop-Up Blocker. Get it for free!
http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/1yWplB/TM
--------------------------------------------------------------------~->
Online help on this group at:
http://help.yahoo.com/help/groups/
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/vansairforce/
<*> To unsubscribe from this group, send an email to:
vansairforce-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
Author: "steve zicree" <szicree@...> Time: Tue Dec 28, 2004 7:24 pm PST Link
Andy,
Any odd indications with regard to temps? Has the compression been checked to rule out valve issues? Are you SURE your carb heat is actually connected and functioning properly? Is the problem the same on both tanks? I'm guessing you've looked at these items already but they'd be the things I'd be looking at. It certainly sounds like some kind of fuel supply/metering issue. I don't think I'd be going up until the problem was figured out. Good luck.
Steve Zicree
----- Original Message -----
From: Andrew (Andy) N. Duncan
To: vansairforce@yahoogroups.com
Sent: Tuesday, December 28, 2004 2:04 PM
Subject: [VAF Mailing List] Rough Running
We have an 2001 RV6A with an O-320 from Aerosport. Since we bought
the plane at 340 hours we have experienced periods of rough running
and occasional severe hesitations. We now have 500 hours on the engine
and it just gets worse and worse.
About 100 hours back we sent the carb back to AeroSport for service
and put in new Autolight plugs - the plane ran smoothly for about an
hour then the problem continued. We have just rebuilt the mags
(slicks), tested the harness (Precision in Portland), replaced all
plugs with Champions, and done the wobble test (everything well within
specs), and checked out the fuel pump and filters.
Immediately after service the plane ran fairly well for a couple of
hours then the roughness returned. Problems tend to be intermittent
but there seem to be a few "reproducable" situations. On climbout at
full throttle it often starts running rough after a couple of minutes
-- often coughing badly as you are turning crosswind or downwind
(scary) - but it smooths out somewhat if you reduce the RPMs to 2 -
2.2k
On cruise it will run smooth as silk for long periods - however, on
descent, when you decrease rpm by a couple of hundred it will run very
rough hesitating badly(not carb ice - heat makes no difference) - or
if you push the thottle in it runs rough -- not fun if you are doing
a go-round.
We and our local A&P have run out of ideas . . . Any suggestions ???
Thanks Andy N829RW
Online help on this group at:
http://help.yahoo.com/help/groups/
Yahoo! Groups Sponsor
ADVERTISEMENT
------------------------------------------------------------------------------
Yahoo! Groups Links
a.. To visit your group on the web, go to:
http://groups.yahoo.com/group/vansairforce/
b.. To unsubscribe from this group, send an email to:
vansairforce-unsubscribe@yahoogroups.com
c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Non-text portions of this message have been removed]
------------------------ Yahoo! Groups Sponsor --------------------~-->
Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar.
Now with Pop-Up Blocker. Get it for free!
http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/1yWplB/TM
--------------------------------------------------------------------~->
Online help on this group at:
http://help.yahoo.com/help/groups/
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/vansairforce/
<*> To unsubscribe from this group, send an email to:
vansairforce-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
Author: "cbass233" <cbass233@...> Time: Tue Dec 28, 2004 5:25 pm PST Link
Check PLead grounding and your mag switches. I had the same symptoms
that you describe. I spent over 1000 bucks rebuilding mags, cleaning
plugs, injectors etc. Turned out there was a bad ground connection on
the PLead. Then a month later I had one of my mag switches (I don't
have a key, just a Right/Left switches) go out. Same symptoms.
Switch felt 'funny' so I replaced it. This only cost about 10 bucks
to fix. I took it appart and noticed it showed wear but it was hard
to say that it failed by inspection.
Good luck.
Chuck
--- In vansairforce@yahoogroups.com, "Andrew (Andy) N. Duncan"
<Andy_Duncan@o...> wrote:
> We have an 2001 RV6A with an O-320 from Aerosport. Since we bought
> the plane at 340 hours we have experienced periods of rough running
> and occasional severe hesitations. We now have 500 hours on the
engine
> and it just gets worse and worse.
>
> About 100 hours back we sent the carb back to AeroSport for service
> and put in new Autolight plugs - the plane ran smoothly for about an
> hour then the problem continued. We have just rebuilt the mags
> (slicks), tested the harness (Precision in Portland), replaced all
> plugs with Champions, and done the wobble test (everything well
within
> specs), and checked out the fuel pump and filters.
>
> Immediately after service the plane ran fairly well for a couple of
> hours then the roughness returned. Problems tend to be intermittent
> but there seem to be a few "reproducable" situations. On climbout
at
> full throttle it often starts running rough after a couple of
minutes
> -- often coughing badly as you are turning crosswind or downwind
> (scary) - but it smooths out somewhat if you reduce the RPMs to 2 -
> 2.2k
>
> On cruise it will run smooth as silk for long periods - however, on
> descent, when you decrease rpm by a couple of hundred it will run
very
> rough hesitating badly(not carb ice - heat makes no difference) - or
> if you push the thottle in it runs rough -- not fun if you are
doing
> a go-round.
>
> We and our local A&P have run out of ideas . . . Any
suggestions ???
>
> Thanks Andy N829RW
------------------------ Yahoo! Groups Sponsor --------------------~-->
$4.98 domain names from Yahoo!. Register anything.
http://us.click.yahoo.com/Q7_YsB/neXJAA/yQLSAA/1yWplB/TM
--------------------------------------------------------------------~->
Online help on this group at:
http://help.yahoo.com/help/groups/
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/vansairforce/
<*> To unsubscribe from this group, send an email to:
vansairforce-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
Author: "Craig Warner" <cwarner@...> Time: Tue Dec 28, 2004 9:14 pm PST Link
Andy
Have you verified fuel pressure, volume and fuel tank vents? Any fuel strainers or filters?
Craig N2851P
----- Original Message -----
From: Andrew (Andy) N. Duncan
To: vansairforce@yahoogroups.com
Sent: Tuesday, December 28, 2004 5:04 PM
Subject: [VAF Mailing List] Rough Running
We have an 2001 RV6A with an O-320 from Aerosport. Since we bought
the plane at 340 hours we have experienced periods of rough running
and occasional severe hesitations. We now have 500 hours on the engine
and it just gets worse and worse.
About 100 hours back we sent the carb back to AeroSport for service
and put in new Autolight plugs - the plane ran smoothly for about an
hour then the problem continued. We have just rebuilt the mags
(slicks), tested the harness (Precision in Portland), replaced all
plugs with Champions, and done the wobble test (everything well within
specs), and checked out the fuel pump and filters.
Immediately after service the plane ran fairly well for a couple of
hours then the roughness returned. Problems tend to be intermittent
but there seem to be a few "reproducable" situations. On climbout at
full throttle it often starts running rough after a couple of minutes
-- often coughing badly as you are turning crosswind or downwind
(scary) - but it smooths out somewhat if you reduce the RPMs to 2 -
2.2k
On cruise it will run smooth as silk for long periods - however, on
descent, when you decrease rpm by a couple of hundred it will run very
rough hesitating badly(not carb ice - heat makes no difference) - or
if you push the thottle in it runs rough -- not fun if you are doing
a go-round.
We and our local A&P have run out of ideas . . . Any suggestions ???
Thanks Andy N829RW
Online help on this group at:
http://help.yahoo.com/help/groups/
Yahoo! Groups Sponsor
ADVERTISEMENT
------------------------------------------------------------------------------
Yahoo! Groups Links
a.. To visit your group on the web, go to:
http://groups.yahoo.com/group/vansairforce/
b.. To unsubscribe from this group, send an email to:
vansairforce-unsubscribe@yahoogroups.com
c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Non-text portions of this message have been removed]
------------------------ Yahoo! Groups Sponsor --------------------~-->
$4.98 domain names from Yahoo!. Register anything.
http://us.click.yahoo.com/Q7_YsB/neXJAA/yQLSAA/1yWplB/TM
--------------------------------------------------------------------~->
Online help on this group at:
http://help.yahoo.com/help/groups/
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/vansairforce/
<*> To unsubscribe from this group, send an email to:
vansairforce-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
Author: "Richard & Roberta Hegy" <rhegy@...> Time: Tue Dec 28, 2004 5:25 pm PST Link
Did you check fuel tank venting, Cam lobe wear, Check fuel flow? Do you have an electric boost pump? Does your fuel gage go south when things go awry?
WOW!! Scary stuff. I hope you find the cause.
Roberta
----- Original Message -----
From: Andrew (Andy) N. Duncan
To: vansairforce@yahoogroups.com
Sent: Tuesday, December 28, 2004 4:04 PM
Subject: [VAF Mailing List] Rough Running
We have an 2001 RV6A with an O-320 from Aerosport. Since we bought
the plane at 340 hours we have experienced periods of rough running
and occasional severe hesitations. We now have 500 hours on the engine
and it just gets worse and worse.
About 100 hours back we sent the carb back to AeroSport for service
and put in new Autolight plugs - the plane ran smoothly for about an
hour then the problem continued. We have just rebuilt the mags
(slicks), tested the harness (Precision in Portland), replaced all
plugs with Champions, and done the wobble test (everything well within
specs), and checked out the fuel pump and filters.
Immediately after service the plane ran fairly well for a couple of
hours then the roughness returned. Problems tend to be intermittent
but there seem to be a few "reproducable" situations. On climbout at
full throttle it often starts running rough after a couple of minutes
-- often coughing badly as you are turning crosswind or downwind
(scary) - but it smooths out somewhat if you reduce the RPMs to 2 -
2.2k
On cruise it will run smooth as silk for long periods - however, on
descent, when you decrease rpm by a couple of hundred it will run very
rough hesitating badly(not carb ice - heat makes no difference) - or
if you push the thottle in it runs rough -- not fun if you are doing
a go-round.
We and our local A&P have run out of ideas . . . Any suggestions ???
Thanks Andy N829RW
Online help on this group at:
http://help.yahoo.com/help/groups/
Yahoo! Groups Sponsor
ADVERTISEMENT
------------------------------------------------------------------------------
Yahoo! Groups Links
a.. To visit your group on the web, go to:
http://groups.yahoo.com/group/vansairforce/
b.. To unsubscribe from this group, send an email to:
vansairforce-unsubscribe@yahoogroups.com
c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Non-text portions of this message have been removed]
------------------------ Yahoo! Groups Sponsor --------------------~-->
$4.98 domain names from Yahoo!. Register anything.
http://us.click.yahoo.com/Q7_YsB/neXJAA/yQLSAA/1yWplB/TM
--------------------------------------------------------------------~->
Online help on this group at:
http://help.yahoo.com/help/groups/
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/vansairforce/
<*> To unsubscribe from this group, send an email to:
vansairforce-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
Author: "mahlon_r" <mahlon_russell@...> Time: Tue Dec 28, 2004 5:42 pm PST Link
Andy,
Some things to check and do:
See if you can get a buddy with an O-320 to let you try his carb.
Sometimes even after checking the carb out you can't find anything
but it still won't work correctly. The only way to positively
eliminate it as the cause, is to replace it with something different.
Remove the valve covers and visually confirm that all valves travel
up and down the same amount. Stand in front of the engine and sight
down the tops of the valve springs and then rotate the engine with
the plugs removed as you sight down the tops of the valve springs. If
a lobe is spalled enough to make it run like yours is running, you
will be able to visually discern that one or two valves are not
opening as much as the others. Pay particular attention to the intake
valves of the forward two cylinders. Some of your symptoms are
classic spalled cam lobe symptoms.
Make sure that your carb air box to carburetor gasket fits the air
box flange perfectly with no extra gasket material extruding inward
from the flange. On certain 320 carburetors this can cause a air
disturbance over a hole that acts as the bowl vent. When this happens
the carb will run really weird with throttle changes and lose power
at full power.
Make sure valve spring tension is good.
Buy 2 new lifters and install on one cylinder and test fly, if you
get the same problem install the lifters you removed on another
cylinder and test fly and so on until you have proven all of the
lifters to be OK. This way you only buy and end up with two spares if
the lifters aren't the problem.
Good Luck and Happy Holidays,
Mahlon
--- In vansairforce@yahoogroups.com, "Andrew (Andy) N. Duncan"
<Andy_Duncan@o...> wrote:
> We have an 2001 RV6A with an O-320 from Aerosport. Since we bought
> the plane at 340 hours we have experienced periods of rough running
> and occasional severe hesitations. We now have 500 hours on the
engine
> and it just gets worse and worse.
>
> About 100 hours back we sent the carb back to AeroSport for service
> and put in new Autolight plugs - the plane ran smoothly for about an
> hour then the problem continued. We have just rebuilt the mags
> (slicks), tested the harness (Precision in Portland), replaced all
> plugs with Champions, and done the wobble test (everything well
within
> specs), and checked out the fuel pump and filters.
>
> Immediately after service the plane ran fairly well for a couple of
> hours then the roughness returned. Problems tend to be intermittent
> but there seem to be a few "reproducable" situations. On climbout
at
> full throttle it often starts running rough after a couple of
minutes
> -- often coughing badly as you are turning crosswind or downwind
> (scary) - but it smooths out somewhat if you reduce the RPMs to 2 -
> 2.2k
>
> On cruise it will run smooth as silk for long periods - however, on
> descent, when you decrease rpm by a couple of hundred it will run
very
> rough hesitating badly(not carb ice - heat makes no difference) - or
> if you push the thottle in it runs rough -- not fun if you are
doing
> a go-round.
>
> We and our local A&P have run out of ideas . . . Any
suggestions ???
>
> Thanks Andy N829RW
------------------------ Yahoo! Groups Sponsor --------------------~-->
Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar.
Now with Pop-Up Blocker. Get it for free!
http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/1yWplB/TM
--------------------------------------------------------------------~->
Online help on this group at:
http://help.yahoo.com/help/groups/
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/vansairforce/
<*> To unsubscribe from this group, send an email to:
vansairforce-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
Author: Gary Dunfee <garydunfee2003@...> Time: Tue Dec 28, 2004 9:52 pm PST Link
Mag Switch contacts ?
"Andrew (Andy) N. Duncan" <Andy_Duncan@ous.edu> wrote:
We have an 2001 RV6A with an O-320 from Aerosport. Since we bought
the plane at 340 hours we have experienced periods of rough running
and occasional severe hesitations. We now have 500 hours on the engine
and it just gets worse and worse.
About 100 hours back we sent the carb back to AeroSport for service
and put in new Autolight plugs - the plane ran smoothly for about an
hour then the problem continued. We have just rebuilt the mags
(slicks), tested the harness (Precision in Portland), replaced all
plugs with Champions, and done the wobble test (everything well within
specs), and checked out the fuel pump and filters.
Immediately after service the plane ran fairly well for a couple of
hours then the roughness returned. Problems tend to be intermittent
but there seem to be a few "reproducable" situations. On climbout at
full throttle it often starts running rough after a couple of minutes
-- often coughing badly as you are turning crosswind or downwind
(scary) - but it smooths out somewhat if you reduce the RPMs to 2 -
2.2k
On cruise it will run smooth as silk for long periods - however, on
descent, when you decrease rpm by a couple of hundred it will run very
rough hesitating badly(not carb ice - heat makes no difference) - or
if you push the thottle in it runs rough -- not fun if you are doing
a go-round.
We and our local A&P have run out of ideas . . . Any suggestions ???
Thanks Andy N829RW
Online help on this group at:
http://help.yahoo.com/help/groups/
Yahoo! Groups SponsorADVERTISEMENT
---------------------------------
Yahoo! Groups Links
To visit your group on the web, go to:
http://groups.yahoo.com/group/vansairforce/
To unsubscribe from this group, send an email to:
vansairforce-unsubscribe@yahoogroups.com
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
Gary Dunfee
RV6A N347GD
Beavercreek, Oregon 97004
---------------------------------
Do you Yahoo!?
Take Yahoo! Mail with you! Get it on your mobile phone.
[Non-text portions of this message have been removed]
------------------------ Yahoo! Groups Sponsor --------------------~-->
$4.98 domain names from Yahoo!. Register anything.
http://us.click.yahoo.com/Q7_YsB/neXJAA/yQLSAA/1yWplB/TM
--------------------------------------------------------------------~->
Online help on this group at:
http://help.yahoo.com/help/groups/
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/vansairforce/
<*> To unsubscribe from this group, send an email to:
vansairforce-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
Author: "Jim Wright" <akflier@...> Time: Wed Dec 29, 2004 4:57 am PST Link
Hi Andy,
This sounds exactly like the experience that we had on our '64 Cessna Skylane. The engine was overhauled by "Western Skyways" when they were in Troutdale, Oregon. The accessories were replaced with overhauled units. We fought the same symptoms that you are experiencing.
In trouble shooting we borrowed a used carb from an overhaul shop installed it and the engine ran perfectly. We sent the overhauled carb back to Western Skyways who replaced it with a bran new one.... we installed that and the engine ran perfectly......
Sometimes overhauled carbs just don't cut it........
You might try replacing the carb with a known good one and see what happens.
----------
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.298 / Virus Database: 265.6.5 - Release Date: 12/26/2004
[Non-text portions of this message have been removed]
------------------------ Yahoo! Groups Sponsor --------------------~-->
Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar.
Now with Pop-Up Blocker. Get it for free!
http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/1yWplB/TM
--------------------------------------------------------------------~->
Online help on this group at:
http://help.yahoo.com/help/groups/
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/vansairforce/
<*> To unsubscribe from this group, send an email to:
vansairforce-unsubscribe@yahoogroups.com
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/