Today's Message Index:
----------------------
1. 05:26 AM - Re: IO360 backfiring (Archie)
2. 06:12 AM - Re: IO-360 backfiring (BERNDSENCO@aol.com)
3. 08:15 AM - Re: Re: IO-360 backfiring (flyv35b)
4. 08:29 AM - Re: Re: IO-360 backfiring (steve korney)
5. 09:11 AM - Re: Re: IO-360 backfiring (Scott Bilinski)
6. 03:17 PM - Re: Re: IO-360 backfiring (Archie)
7. 03:36 PM - Re: Re: IO-360 backfiring (Scott Bilinski)
8. 05:02 PM - Re: Re: IO-360 backfiring (Archie)
Message 1
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| Subject: | Re: IO360 backfiring |
--> Engines-List message posted by: "Archie" <archie97@earthlink.net>
While the previous responses to the initial question are valid,
and have merit to a degree, perhaps one area may be overlooked.
If you have an aftermarket exhaust system, the so-called backfiring
when the throttle is closed is enhanced. A standard muffler system
masks this reaction.
If running a camshaft with increased overlap, this is phenomenon
is increased.
Archie
----- Original Message -----
From: "steve korney" <s_korney@hotmail.com>
Subject: RE: Engines-List: IO360 backfiring
> --> Engines-List message posted by: "steve korney" <s_korney@hotmail.com>
>
> Exhaust gaskets.....
>
>
> Best... Steve
>
>
> ----Original Message Follows----
> From: BERNDSENCO@aol.com
> To: engines-list@matronics.com
> Subject: Engines-List: IO360 backfiring
> Date: Sun, 26 Jun 2005 11:34:07 EDT
>
> --> Engines-List message posted by: BERNDSENCO@aol.com
>
> I have an IO-360 180 HP constant speed in my RV-7, 125 hours SMOH. When
> I
> pull the throttle while on decent in the pattern, and also while taxiing
> at
> idle, I'm getting a lot of popping/backfiring from the exhaust. It
> started
> mildly about 50 hours ago and is getting much worse. I have friend who
> has
> the
> same engine (200 hours) in his RV-8 and his has been doing the same.
>
> I had one person claim vacuum leaks can cause this, so I went over the
> entire induction system and verified everything is tight. Any suggestions
> on what
> is causing this? Other than this, the engine runs great.
>
> Thanks,
>
> Jon
>
>
>
Message 2
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| Subject: | Re: IO-360 backfiring |
--> Engines-List message posted by: BERNDSENCO@aol.com
I am running a standard Slick magneto system. Haven't checked the ignition
timing yet, but will next time the cowl is off. Engine runs fine though, so
I'd be surprised if the timing is off by much.
Steve, what do you imply with exhaust gaskets? Please expand on this.
Archie, I am using a 4 into 1 exhaust header with no muffler, whereas my
friend who has the same problem with his IO-360 is running the standard Van's 2
into 1 x 2 setup. My exhaust noise level is a little louder than his in
normal use. However, the exhaust setup doesn't explain why the
popping/backfiring started about 50 hours ago and has gotten progressively worse.
Could it be
a mixture problem?
Jon
In a message dated 6/27/2005 2:57:50 A.M. Eastern Standard Time,
engines-list-digest@matronics.com writes:
________________________________ Message 2
_____________________________________
Time: 09:06:47 AM PST US
From: John Grosse <grosseair@comcast.net>
Subject: Re: Engines-List: IO360 backfiring
--> Engines-List message posted by: John Grosse <grosseair@comcast.net>
Did you check the timing? I What type of ignition system do you have?
John Grosse
IO-360 B1E in a Piper Arrow
BERNDSENCO@aol.com wrote:
>--> Engines-List message posted by: BERNDSENCO@aol.com
>
>I have an IO-360 180 HP constant speed in my RV-7, 125 hours SMOH. When I
>pull the throttle while on decent in the pattern, and also while taxiing
at
>idle, I'm getting a lot of popping/backfiring from the exhaust. It
started
>mildly about 50 hours ago and is getting much worse. I have friend who
has the
>same engine (200 hours) in his RV-8 and his has been doing the same.
>
>I had one person claim vacuum leaks can cause this, so I went over the
>entire induction system and verified everything is tight. Any suggestions
on
what
>is causing this? Other than this, the engine runs great.
>
>Thanks,
>
>Jon
>
>
>
>
________________________________ Message 3
_____________________________________
Time: 08:06:38 PM PST US
From: "steve korney" <s_korney@hotmail.com>
Subject: RE: Engines-List: IO360 backfiring
--> Engines-List message posted by: "steve korney" <s_korney@hotmail.com>
Exhaust gaskets.....
Best... Steve
Message 3
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| Subject: | Re: IO-360 backfiring |
--> Engines-List message posted by: "flyv35b" <flyv35b@ashcreekwireless.com>
My experience has been that it is a to lean idle mixture or an induction
system air leak.
Cliff A&P/IA
----- Original Message -----
From: <BERNDSENCO@aol.com>
Subject: Engines-List: Re: IO-360 backfiring
> --> Engines-List message posted by: BERNDSENCO@aol.com
>
>
> I am running a standard Slick magneto system. Haven't checked the
> ignition
> timing yet, but will next time the cowl is off. Engine runs fine though,
> so
> I'd be surprised if the timing is off by much.
>
> Steve, what do you imply with exhaust gaskets? Please expand on this.
>
> Archie, I am using a 4 into 1 exhaust header with no muffler, whereas my
> friend who has the same problem with his IO-360 is running the standard
> Van's 2
> into 1 x 2 setup. My exhaust noise level is a little louder than his in
> normal use. However, the exhaust setup doesn't explain why the
> popping/backfiring started about 50 hours ago and has gotten progressively
> worse. Could it be
> a mixture problem?
>
> Jon
>
>
> In a message dated 6/27/2005 2:57:50 A.M. Eastern Standard Time,
> engines-list-digest@matronics.com writes:
>
> ________________________________ Message 2
> _____________________________________
>
>
> Time: 09:06:47 AM PST US
> From: John Grosse <grosseair@comcast.net>
> Subject: Re: Engines-List: IO360 backfiring
>
> --> Engines-List message posted by: John Grosse <grosseair@comcast.net>
>
> Did you check the timing? I What type of ignition system do you have?
>
> John Grosse
> IO-360 B1E in a Piper Arrow
>
> BERNDSENCO@aol.com wrote:
>
>>--> Engines-List message posted by: BERNDSENCO@aol.com
>>
>>I have an IO-360 180 HP constant speed in my RV-7, 125 hours SMOH. When
>>I
>>pull the throttle while on decent in the pattern, and also while taxiing
> at
>>idle, I'm getting a lot of popping/backfiring from the exhaust. It
> started
>>mildly about 50 hours ago and is getting much worse. I have friend who
> has the
>
>>same engine (200 hours) in his RV-8 and his has been doing the same.
>>
>>I had one person claim vacuum leaks can cause this, so I went over the
>>entire induction system and verified everything is tight. Any
>>suggestions
> on
> what
>>is causing this? Other than this, the engine runs great.
>>
>>Thanks,
>>
>>Jon
>>
>>
>>
>>
>
>
> ________________________________ Message 3
> _____________________________________
>
>
> Time: 08:06:38 PM PST US
> From: "steve korney" <s_korney@hotmail.com>
> Subject: RE: Engines-List: IO360 backfiring
>
> --> Engines-List message posted by: "steve korney" <s_korney@hotmail.com>
>
> Exhaust gaskets.....
>
>
> Best... Steve
>
>
>
Message 4
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| Subject: | Re: IO-360 backfiring |
--> Engines-List message posted by: "steve korney" <s_korney@hotmail.com>
John Myers explained it very well...
Best... Steve
----Original Message Follows----
From: BERNDSENCO@aol.com
Subject: Engines-List: Re: IO-360 backfiring
--> Engines-List message posted by: BERNDSENCO@aol.com
I am running a standard Slick magneto system. Haven't checked the ignition
timing yet, but will next time the cowl is off. Engine runs fine though,
so
I'd be surprised if the timing is off by much.
Steve, what do you imply with exhaust gaskets? Please expand on this.
Archie, I am using a 4 into 1 exhaust header with no muffler, whereas my
friend who has the same problem with his IO-360 is running the standard
Van's 2
into 1 x 2 setup. My exhaust noise level is a little louder than his in
normal use. However, the exhaust setup doesn't explain why the
popping/backfiring started about 50 hours ago and has gotten progressively
worse. Could it be
a mixture problem?
Jon
In a message dated 6/27/2005 2:57:50 A.M. Eastern Standard Time,
engines-list-digest@matronics.com writes:
________________________________ Message 2
_____________________________________
Time: 09:06:47 AM PST US
From: John Grosse <grosseair@comcast.net>
Subject: Re: Engines-List: IO360 backfiring
--> Engines-List message posted by: John Grosse <grosseair@comcast.net>
Did you check the timing? I What type of ignition system do you have?
John Grosse
IO-360 B1E in a Piper Arrow
BERNDSENCO@aol.com wrote:
>--> Engines-List message posted by: BERNDSENCO@aol.com
>
>I have an IO-360 180 HP constant speed in my RV-7, 125 hours SMOH. When
I
>pull the throttle while on decent in the pattern, and also while taxiing
at
>idle, I'm getting a lot of popping/backfiring from the exhaust. It
started
>mildly about 50 hours ago and is getting much worse. I have friend who
has the
>same engine (200 hours) in his RV-8 and his has been doing the same.
>
>I had one person claim vacuum leaks can cause this, so I went over the
>entire induction system and verified everything is tight. Any
suggestions
on
what
>is causing this? Other than this, the engine runs great.
>
>Thanks,
>
>Jon
>
>
>
>
________________________________ Message 3
_____________________________________
Time: 08:06:38 PM PST US
From: "steve korney" <s_korney@hotmail.com>
Subject: RE: Engines-List: IO360 backfiring
--> Engines-List message posted by: "steve korney" <s_korney@hotmail.com>
Exhaust gaskets.....
Best... Steve
Message 5
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|
| Subject: | Re: IO-360 backfiring |
--> Engines-List message posted by: Scott Bilinski <bilinski@kyocera-wireless.com>
A good scavenging system such as a 4 into 1 or the Vetterman can
backfire/pop with the throttle pulled back to idle in flight. I have been
told this is normal by Larry Vetterman. I have an IO and yes it pops on
final when pulled back to idle, its done this from day one. I did lean out
the idle mixture and that helped reduce it a bit. I usually have 6~8 inches
on during final so there is no popping, the slightest amount of power
stopped it, at least in my case. There are also houses/business under final
for me and I make sure no to pop at them.
Now all the reasons that have been given in previous E-mails are all
possible suspects too.
Oh, those of you with new engines, I noticed that I had to re-torque my
exhaust nuts 3 times before they held the torque.
At 03:29 PM 6/27/2005 +0000, you wrote:
>--> Engines-List message posted by: "steve korney" <s_korney@hotmail.com>
>
>John Myers explained it very well...
>
>
>Best... Steve
>
>
>----Original Message Follows----
>From: BERNDSENCO@aol.com
>To: engines-list@matronics.com
>Subject: Engines-List: Re: IO-360 backfiring
>Date: Mon, 27 Jun 2005 09:11:32 EDT
>
>--> Engines-List message posted by: BERNDSENCO@aol.com
>
>
>I am running a standard Slick magneto system. Haven't checked the ignition
>timing yet, but will next time the cowl is off. Engine runs fine though,
>so
>I'd be surprised if the timing is off by much.
>
>Steve, what do you imply with exhaust gaskets? Please expand on this.
>
>Archie, I am using a 4 into 1 exhaust header with no muffler, whereas my
>friend who has the same problem with his IO-360 is running the standard
>Van's 2
>into 1 x 2 setup. My exhaust noise level is a little louder than his in
>normal use. However, the exhaust setup doesn't explain why the
>popping/backfiring started about 50 hours ago and has gotten progressively
>worse. Could it be
>a mixture problem?
>
>Jon
>
>
>In a message dated 6/27/2005 2:57:50 A.M. Eastern Standard Time,
>engines-list-digest@matronics.com writes:
>
>________________________________ Message 2
>_____________________________________
>
>
>Time: 09:06:47 AM PST US
>From: John Grosse <grosseair@comcast.net>
>Subject: Re: Engines-List: IO360 backfiring
>
>--> Engines-List message posted by: John Grosse <grosseair@comcast.net>
>
>Did you check the timing? I What type of ignition system do you have?
>
>John Grosse
>IO-360 B1E in a Piper Arrow
>
>BERNDSENCO@aol.com wrote:
>
> >--> Engines-List message posted by: BERNDSENCO@aol.com
> >
> >I have an IO-360 180 HP constant speed in my RV-7, 125 hours SMOH. When
>I
> >pull the throttle while on decent in the pattern, and also while taxiing
>at
> >idle, I'm getting a lot of popping/backfiring from the exhaust. It
>started
> >mildly about 50 hours ago and is getting much worse. I have friend who
>has the
>
> >same engine (200 hours) in his RV-8 and his has been doing the same.
> >
> >I had one person claim vacuum leaks can cause this, so I went over the
> >entire induction system and verified everything is tight. Any
>suggestions
>on
>what
> >is causing this? Other than this, the engine runs great.
> >
> >Thanks,
> >
> >Jon
> >
> >
> >
> >
>
>
>________________________________ Message 3
>_____________________________________
>
>
>Time: 08:06:38 PM PST US
>From: "steve korney" <s_korney@hotmail.com>
>Subject: RE: Engines-List: IO360 backfiring
>
>--> Engines-List message posted by: "steve korney" <s_korney@hotmail.com>
>
>Exhaust gaskets.....
>
>
>Best... Steve
>
>
Scott Bilinski
Eng dept 305
Phone (858) 657-2536
Pager (858) 502-5190
Message 6
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| Subject: | Re: IO-360 backfiring |
--> Engines-List message posted by: "Archie" <archie97@earthlink.net>
Mixture will contribute to it, without question, in which an
intake leak could be part of the cause.
When assembling a new engine, I leave the rocker arms off,
and slightly pressurize the induction (6-9 psi) to verify no leaks.
I have found more sump/tube leaks this way, that might not show
up otherwise.
Archie
----- Original Message -----
From: <BERNDSENCO@aol.com>
Subject: Engines-List: Re: IO-360 backfiring
> --> Engines-List message posted by: BERNDSENCO@aol.com
>
>
> I am running a standard Slick magneto system. Haven't checked the
> ignition
> timing yet, but will next time the cowl is off. Engine runs fine though,
> so
> I'd be surprised if the timing is off by much.
>
> Steve, what do you imply with exhaust gaskets? Please expand on this.
>
> Archie, I am using a 4 into 1 exhaust header with no muffler, whereas my
> friend who has the same problem with his IO-360 is running the standard
> Van's 2
> into 1 x 2 setup. My exhaust noise level is a little louder than his in
> normal use. However, the exhaust setup doesn't explain why the
> popping/backfiring started about 50 hours ago and has gotten progressively
> worse. Could it be
> a mixture problem?
>
> Jon
>
>
> In a message dated 6/27/2005 2:57:50 A.M. Eastern Standard Time,
> engines-list-digest@matronics.com writes:
>
> ________________________________ Message 2
> _____________________________________
>
>
> Time: 09:06:47 AM PST US
> From: John Grosse <grosseair@comcast.net>
> Subject: Re: Engines-List: IO360 backfiring
>
> --> Engines-List message posted by: John Grosse <grosseair@comcast.net>
>
> Did you check the timing? I What type of ignition system do you have?
>
> John Grosse
> IO-360 B1E in a Piper Arrow
>
> BERNDSENCO@aol.com wrote:
>
>>--> Engines-List message posted by: BERNDSENCO@aol.com
>>
>>I have an IO-360 180 HP constant speed in my RV-7, 125 hours SMOH. When
>>I
>>pull the throttle while on decent in the pattern, and also while taxiing
> at
>>idle, I'm getting a lot of popping/backfiring from the exhaust. It
> started
>>mildly about 50 hours ago and is getting much worse. I have friend who
> has the
>
>>same engine (200 hours) in his RV-8 and his has been doing the same.
>>
>>I had one person claim vacuum leaks can cause this, so I went over the
>>entire induction system and verified everything is tight. Any
>>suggestions
> on
> what
>>is causing this? Other than this, the engine runs great.
>>
>>Thanks,
>>
>>Jon
>>
>>
>>
>>
>
>
> ________________________________ Message 3
> _____________________________________
>
>
> Time: 08:06:38 PM PST US
> From: "steve korney" <s_korney@hotmail.com>
> Subject: RE: Engines-List: IO360 backfiring
>
> --> Engines-List message posted by: "steve korney" <s_korney@hotmail.com>
>
> Exhaust gaskets.....
>
>
> Best... Steve
>
>
>
Message 7
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|
| Subject: | Re: IO-360 backfiring |
--> Engines-List message posted by: Scott Bilinski <bilinski@kyocera-wireless.com>
What is the best way to seal sump tubes? I am sure tightening the clamp is
not always the answer.
At 06:05 PM 6/27/2005 -0400, you wrote:
>--> Engines-List message posted by: "Archie" <archie97@earthlink.net>
>
>Mixture will contribute to it, without question, in which an
>intake leak could be part of the cause.
>When assembling a new engine, I leave the rocker arms off,
>and slightly pressurize the induction (6-9 psi) to verify no leaks.
>I have found more sump/tube leaks this way, that might not show
>up otherwise.
>Archie
>
>----- Original Message -----
>From: <BERNDSENCO@aol.com>
>To: <engines-list@matronics.com>
>Subject: Engines-List: Re: IO-360 backfiring
>
>
> > --> Engines-List message posted by: BERNDSENCO@aol.com
> >
> >
> > I am running a standard Slick magneto system. Haven't checked the
> > ignition
> > timing yet, but will next time the cowl is off. Engine runs fine though,
> > so
> > I'd be surprised if the timing is off by much.
> >
> > Steve, what do you imply with exhaust gaskets? Please expand on this.
> >
> > Archie, I am using a 4 into 1 exhaust header with no muffler, whereas my
> > friend who has the same problem with his IO-360 is running the standard
> > Van's 2
> > into 1 x 2 setup. My exhaust noise level is a little louder than his in
> > normal use. However, the exhaust setup doesn't explain why the
> > popping/backfiring started about 50 hours ago and has gotten progressively
> > worse. Could it be
> > a mixture problem?
> >
> > Jon
> >
> >
> > In a message dated 6/27/2005 2:57:50 A.M. Eastern Standard Time,
> > engines-list-digest@matronics.com writes:
> >
> > ________________________________ Message 2
> > _____________________________________
> >
> >
> > Time: 09:06:47 AM PST US
> > From: John Grosse <grosseair@comcast.net>
> > Subject: Re: Engines-List: IO360 backfiring
> >
> > --> Engines-List message posted by: John Grosse <grosseair@comcast.net>
> >
> > Did you check the timing? I What type of ignition system do you have?
> >
> > John Grosse
> > IO-360 B1E in a Piper Arrow
> >
> > BERNDSENCO@aol.com wrote:
> >
> >>--> Engines-List message posted by: BERNDSENCO@aol.com
> >>
> >>I have an IO-360 180 HP constant speed in my RV-7, 125 hours SMOH. When
> >>I
> >>pull the throttle while on decent in the pattern, and also while taxiing
> > at
> >>idle, I'm getting a lot of popping/backfiring from the exhaust. It
> > started
> >>mildly about 50 hours ago and is getting much worse. I have friend who
> > has the
> >
> >>same engine (200 hours) in his RV-8 and his has been doing the same.
> >>
> >>I had one person claim vacuum leaks can cause this, so I went over the
> >>entire induction system and verified everything is tight. Any
> >>suggestions
> > on
> > what
> >>is causing this? Other than this, the engine runs great.
> >>
> >>Thanks,
> >>
> >>Jon
> >>
> >>
> >>
> >>
> >
> >
> > ________________________________ Message 3
> > _____________________________________
> >
> >
> > Time: 08:06:38 PM PST US
> > From: "steve korney" <s_korney@hotmail.com>
> > Subject: RE: Engines-List: IO360 backfiring
> >
> > --> Engines-List message posted by: "steve korney" <s_korney@hotmail.com>
> >
> > Exhaust gaskets.....
> >
> >
> > Best... Steve
> >
> >
> >
>
>
Scott Bilinski
Eng dept 305
Phone (858) 657-2536
Pager (858) 502-5190
Message 8
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| Subject: | Re: IO-360 backfiring |
--> Engines-List message posted by: "Archie" <archie97@earthlink.net>
I have seen everything from epoxy, to tape, to RTV, but the proper way is to
expand the tube into a receiver groove machined into the sump.
They will occasionally loosen up.
Most any engine shop will have this tool which usually comes in two basic
sizes.
Without really going to a commercial, I also manufacture them, but they are
expensive.
Archie
> --> Engines-List message posted by: Scott Bilinski
> <bilinski@kyocera-wireless.com>
>
> What is the best way to seal sump tubes? I am sure tightening the clamp is
> not always the answer.
>
>
> At 06:05 PM 6/27/2005 -0400, you wrote:
>>--> Engines-List message posted by: "Archie" <archie97@earthlink.net>
>>
>>Mixture will contribute to it, without question, in which an
>>intake leak could be part of the cause.
>>When assembling a new engine, I leave the rocker arms off,
>>and slightly pressurize the induction (6-9 psi) to verify no leaks.
>>I have found more sump/tube leaks this way, that might not show
>>up otherwise.
>>Archie
>>
>>----- Original Message -----
>>From: <BERNDSENCO@aol.com>
>>To: <engines-list@matronics.com>
>>Subject: Engines-List: Re: IO-360 backfiring
>>
>>
>> > --> Engines-List message posted by: BERNDSENCO@aol.com
>> >
>> >
>> > I am running a standard Slick magneto system. Haven't checked the
>> > ignition
>> > timing yet, but will next time the cowl is off. Engine runs fine
>> > though,
>> > so
>> > I'd be surprised if the timing is off by much.
>> >
>> > Steve, what do you imply with exhaust gaskets? Please expand on this.
>> >
>> > Archie, I am using a 4 into 1 exhaust header with no muffler, whereas
>> > my
>> > friend who has the same problem with his IO-360 is running the standard
>> > Van's 2
>> > into 1 x 2 setup. My exhaust noise level is a little louder than his
>> > in
>> > normal use. However, the exhaust setup doesn't explain why the
>> > popping/backfiring started about 50 hours ago and has gotten
>> > progressively
>> > worse. Could it be
>> > a mixture problem?
>> >
>> > Jon
>> >
>> >
>> > In a message dated 6/27/2005 2:57:50 A.M. Eastern Standard Time,
>> > engines-list-digest@matronics.com writes:
>> >
>> > ________________________________ Message 2
>> > _____________________________________
>> >
>> >
>> > Time: 09:06:47 AM PST US
>> > From: John Grosse <grosseair@comcast.net>
>> > Subject: Re: Engines-List: IO360 backfiring
>> >
>> > --> Engines-List message posted by: John Grosse
>> > <grosseair@comcast.net>
>> >
>> > Did you check the timing? I What type of ignition system do you have?
>> >
>> > John Grosse
>> > IO-360 B1E in a Piper Arrow
>> >
>> > BERNDSENCO@aol.com wrote:
>> >
>> >>--> Engines-List message posted by: BERNDSENCO@aol.com
>> >>
>> >>I have an IO-360 180 HP constant speed in my RV-7, 125 hours SMOH.
>> >>When
>> >>I
>> >>pull the throttle while on decent in the pattern, and also while
>> >>taxiing
>> > at
>> >>idle, I'm getting a lot of popping/backfiring from the exhaust. It
>> > started
>> >>mildly about 50 hours ago and is getting much worse. I have friend
>> >>who
>> > has the
>> >
>> >>same engine (200 hours) in his RV-8 and his has been doing the same.
>> >>
>> >>I had one person claim vacuum leaks can cause this, so I went over the
>> >>entire induction system and verified everything is tight. Any
>> >>suggestions
>> > on
>> > what
>> >>is causing this? Other than this, the engine runs great.
>> >>
>> >>Thanks,
>> >>
>> >>Jon
>> >>
>> >>
>> >>
>> >>
>> >
>> >
>> > ________________________________ Message 3
>> > _____________________________________
>> >
>> >
>> > Time: 08:06:38 PM PST US
>> > From: "steve korney" <s_korney@hotmail.com>
>> > Subject: RE: Engines-List: IO360 backfiring
>> >
>> > --> Engines-List message posted by: "steve korney"
>> > <s_korney@hotmail.com>
>> >
>> > Exhaust gaskets.....
>> >
>> >
>> > Best... Steve
>> >
>> >
>> >
>>
>>
>
>
> Scott Bilinski
> Eng dept 305
> Phone (858) 657-2536
> Pager (858) 502-5190
>
>
>
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