KR> Ignition noise

[Kenneth L Wiltrout]

Hi Brian, This e-mail just showed upRevmaster sent me
Autolite 425 plugs which are resistor plugs according to their web site.
Revmaster does use a shielded harness. After telling Joe at revmaster
about the radio noise he said what did u gap the plugs at? I said since
there were no instructions I left them at .030 as that's what they were
all set at, then he said that's my problem, re gap to .016, so I did and
believe it or not the noise went away on the ground but in flight it came
back about 75% of what it was. So I called an avionics shop and was told
to get some shielding ( the tubular variety that is woven like Chinese
finger cuff's ) and slide it over the last couple of inches of wire prior
to the plug boot and down over the boot as well, and for good measure
solder a wire to the shielding and ground that to the block as well. So
I'm waiting for the shielding now.
I may call Steve at Great Plains, I completely forgot about
himThanks!


On Sat, 12 Jun 2004 14:56:42 -0400 "Brian Kraut" <brian.kr...@engalt.com>
writes:
> Are you using resistor plugs?
> 
> Great Plains recommeds only Bosch W8AC plugs.  I used them and had 
> no noise.
> 
> I am not familiar with the Revemaster conversion.  Great Plains uses 
> an
> aluminum machined piece that completely covers the plug.  The 
> standard
> shielded ignition wires connect to this piece and keep the plug 
> completely
> shielded.  Steve recommends connectiong a wire from the aluminum 
> piece to
> the engine if there is noise, but I never had to do that.
> 
> Does the Revmaster use a shielded harness?  Are you using it off of 
> a mag?
> 
> Brian Kraut
> Engineering Alternatives, Inc.
> www.engalt.com
> 
> -Original Message-
> From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
> Behalf Of Kenneth L Wiltrout
> Sent: Saturday, June 12, 2004 2:23 PM
> To: kr...@mylist.net
> Subject: KR> Ignition noise
> 
> 
> Due to the high cost of aviation plugs I decided to buy the 
> Revmaster
> conversion kit to auto plugs-that being said 
> the
> engine runs excellant but now I have unbearable ignition noise. If I 
> had
> to do it over I never would have done this. Any of you radio techs 
> out
> the know of a solution??   If I have too I will re install a new 
> aviation
> harness and plugs. ( but I'd rather not  $$$ ) THANKS!!
> 
> 
> The best thing to hit the Internet in years - Juno SpeedBand!
> Surf the Web up to FIVE TIMES FASTER!
> Only $14.95/ month - visit www.juno.com to sign up today!
> 
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> please see other KRnet info at http://www.krnet.org/info.html
> 
> 
> 
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> please see other KRnet info at http://www.krnet.org/info.html
> 
> 


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KR> Ignition noise

[Brian Kraut]

If they are just using a regular spark plug boot that sounds like the
problem.  I really liked the aluminum shrouds that go over the entire
insulator that Steve sells.

Steve recomends .014 or .016 or something like that.  A magneto really can't
fire very well on a big gap.  I am kind of surprised your engine kept
running good.

Brian Kraut
Engineering Alternatives, Inc.
www.engalt.com

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
Behalf Of Kenneth L Wiltrout
Sent: Sunday, June 27, 2004 9:15 PM
To: kr...@mylist.net
Subject: Re: KR> Ignition noise



Hi Brian, This e-mail just showed upRevmaster sent me
Autolite 425 plugs which are resistor plugs according to their web site.
Revmaster does use a shielded harness. After telling Joe at revmaster
about the radio noise he said what did u gap the plugs at? I said since
there were no instructions I left them at .030 as that's what they were
all set at, then he said that's my problem, re gap to .016, so I did and
believe it or not the noise went away on the ground but in flight it came
back about 75% of what it was. So I called an avionics shop and was told
to get some shielding ( the tubular variety that is woven like Chinese
finger cuff's ) and slide it over the last couple of inches of wire prior
to the plug boot and down over the boot as well, and for good measure
solder a wire to the shielding and ground that to the block as well. So
I'm waiting for the shielding now.
I may call Steve at Great Plains, I completely forgot about
himThanks!


On Sat, 12 Jun 2004 14:56:42 -0400 "Brian Kraut" <brian.kr...@engalt.com>
writes:
> Are you using resistor plugs?
>
> Great Plains recommeds only Bosch W8AC plugs.  I used them and had
> no noise.
>
> I am not familiar with the Revemaster conversion.  Great Plains uses
> an
> aluminum machined piece that completely covers the plug.  The
> standard
> shielded ignition wires connect to this piece and keep the plug
> completely
> shielded.  Steve recommends connectiong a wire from the aluminum
> piece to
> the engine if there is noise, but I never had to do that.
>
> Does the Revmaster use a shielded harness?  Are you using it off of
> a mag?
>
> Brian Kraut
> Engineering Alternatives, Inc.
> www.engalt.com
>
> -Original Message-
> From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
> Behalf Of Kenneth L Wiltrout
> Sent: Saturday, June 12, 2004 2:23 PM
> To: kr...@mylist.net
> Subject: KR> Ignition noise
>
>
> Due to the high cost of aviation plugs I decided to buy the
> Revmaster
> conversion kit to auto plugs-that being said
> the
> engine runs excellant but now I have unbearable ignition noise. If I
> had
> to do it over I never would have done this. Any of you radio techs
> out
> the know of a solution??   If I have too I will re install a new
> aviation
> harness and plugs. ( but I'd rather not  $$$ ) THANKS!!
>
> 
> The best thing to hit the Internet in years - Juno SpeedBand!
> Surf the Web up to FIVE TIMES FASTER!
> Only $14.95/ month - visit www.juno.com to sign up today!
>
> ___
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> please see other KRnet info at http://www.krnet.org/info.html
>
>
>
> ___
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> please see other KRnet info at http://www.krnet.org/info.html
>
>


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KR> Ignition noise

[Wood, Sidney M.]

Ken,
The wider plug gap will cause the voltage to build to a higher value before the 
plug fires.  This in turn releases more peak RF energy in a shorter time when 
the plug fires.  This produces a much stronger RF pulse; not good if you want 
the best radio communications in the aircraft band, but great if you want a 
spark-gap radio transmitter.  An Italian guy, Marconi, discovered this about a 
100 years ago.  Since Wilber and Orville were not talking to ATC yet, nobody 
much cared then.  But now, with our road warrior mind set, we have shielded 
plug wires, filter capacitors, resistor plug wires, shielded plugs, resistor 
plugs, lead dress and all manner of tricks to tame the magical genie in AM 
radio.
Sid Wood, Tri-gear KR-2 N6242
Mechanicsville, MD USA
sidney.w...@titan.com


From:   Kenneth L Wiltrout
  For those of u that responded, Joe at Revmaster said what did I gap the
plugs  at, I told him since no instructions came with them I took the
average of what they were gapped at in the box and set them all at .030.
He said that is probably most of the problem, regap to .016 they are
trying too hard to fire and creating to much RF
energy---Does this make sense

KR> Ignition noise

[Kenneth L Wiltrout]

Due to the high cost of aviation plugs I decided to buy the Revmaster
conversion kit to auto plugs-that being said the
engine runs excellant but now I have unbearable ignition noise. If I had
to do it over I never would have done this. Any of you radio techs out
the know of a solution??   If I have too I will re install a new aviation
harness and plugs. ( but I'd rather not  $$$ ) THANKS!!


The best thing to hit the Internet in years - Juno SpeedBand!
Surf the Web up to FIVE TIMES FASTER!
Only $14.95/ month - visit www.juno.com to sign up today!

KR> Ignition noise

[Brian Kraut]

Are you using resistor plugs?

Great Plains recommeds only Bosch W8AC plugs.  I used them and had no noise.

I am not familiar with the Revemaster conversion.  Great Plains uses an
aluminum machined piece that completely covers the plug.  The standard
shielded ignition wires connect to this piece and keep the plug completely
shielded.  Steve recommends connectiong a wire from the aluminum piece to
the engine if there is noise, but I never had to do that.

Does the Revmaster use a shielded harness?  Are you using it off of a mag?

Brian Kraut
Engineering Alternatives, Inc.
www.engalt.com

-Original Message-
From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net]On
Behalf Of Kenneth L Wiltrout
Sent: Saturday, June 12, 2004 2:23 PM
To: kr...@mylist.net
Subject: KR> Ignition noise


Due to the high cost of aviation plugs I decided to buy the Revmaster
conversion kit to auto plugs-that being said the
engine runs excellant but now I have unbearable ignition noise. If I had
to do it over I never would have done this. Any of you radio techs out
the know of a solution??   If I have too I will re install a new aviation
harness and plugs. ( but I'd rather not  $$$ ) THANKS!!


The best thing to hit the Internet in years - Juno SpeedBand!
Surf the Web up to FIVE TIMES FASTER!
Only $14.95/ month - visit www.juno.com to sign up today!

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please see other KRnet info at http://www.krnet.org/info.html

KR> Ignition noise

[Stephen Jacobs]

now I have unbearable ignition noise - Any of you radio techs out there
know of a solution??   



Kenneth

There is no doubt that you can solve your problem without too much
trouble (or $$).  You will probably get some good advice here - if not,
join this yahoo group:  http://www.avionicsinstallations.com/

I keep an eye on their posts - some well informed lads that are happy to
help.

Good luck
Steve J
Zambia

KR> Ignition noise

[Kenneth L Wiltrout]

Thanks Steve--I already sent them an Email.
Kenny



On Sat, 12 Jun 2004 21:01:24 +0200 "Stephen Jacobs" 
writes:
> now I have unbearable ignition noise - Any of you radio techs out 
> there
> know of a solution??   
> 
> 
> 
> Kenneth
> 
> There is no doubt that you can solve your problem without too much
> trouble (or $$).  You will probably get some good advice here - if 
> not,
> join this yahoo group:  http://www.avionicsinstallations.com/
> 
> I keep an eye on their posts - some well informed lads that are 
> happy to
> help.
> 
> Good luck
> Steve J
> Zambia
> 
> 
> 
> ___
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> please see other KRnet info at http://www.krnet.org/info.html
> 
> 


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Surf the Web up to FIVE TIMES FASTER!
Only $14.95/ month - visit www.juno.com to sign up today!

KR> Ignition Noise

[JIM VANCE]

The auto plugs should have an R in the number.  These are the resistor version 
of the standard plugs and will greatly reduce radio interference (Rotax changed 
their plugs to resistor type for this reason).  If all else fails, buy some 
metal braid that is used for grounding straps, etc.  Put it over the ignition 
wires from the plug to the distributor/magneto.  Use heat shrink tubing at each 
end.  Ground just one end of each wire at the distributor.  If  you ground both 
ends, then you have a conductor rather than a shield and it won't work.

I've done these two things to the Rotax 582 in my Renegade.  I can hear people 
in the pattern at airports a hundred miles away.

Jim Vance
va...@claflinwildcats.com

KR> Ignition Noise

[Kenneth L Wiltrout]

Thanks Jim-Someone told me the power wire to the radio needs to
be sheilded as the eng noise is conducted through the radio via this
wire??




On Sat, 12 Jun 2004 20:20:57 -0500 "JIM VANCE"
 writes:
> The auto plugs should have an R in the number.  These are the 
> resistor version of the standard plugs and will greatly reduce radio 
> interference (Rotax changed their plugs to resistor type for this 
> reason).  If all else fails, buy some metal braid that is used for 
> grounding straps, etc.  Put it over the ignition wires from the plug 
> to the distributor/magneto.  Use heat shrink tubing at each end.  
> Ground just one end of each wire at the distributor.  If  you ground 
> both ends, then you have a conductor rather than a shield and it 
> won't work.
> 
> I've done these two things to the Rotax 582 in my Renegade.  I can 
> hear people in the pattern at airports a hundred miles away.
> 
> Jim Vance
> va...@claflinwildcats.com
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> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> please see other KRnet info at http://www.krnet.org/info.html
> 
> 


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KR> Ignition Noise

[StRaNgEdAyS]

"Someone told me the power wire to the radio needs to
be sheilded as the eng noise is conducted through the radio via this
wire??"
A power filter can be fitted to the power bus of the radio stack. You can see 
similar devices attached to most car stereo power leads for just this reason.

KR> Ignition noise

[JIM VANCE]

Ken,

A brute force line filter at the power inlet of the radio stack is great 
insurance.  Then it's not important to have a shielded power wire.

The ignition noise can be getting into the radio on the power wire or on the 
antenna.  One quick check is to  have the engine running and disconnect the 
coaxial cable at the radio.  If the noise goes away, it's coming in on the 
antenna.  Then the only solution is to stop the noise at the source.

Jim Vance
va...@claflinwildcats.com

KR> Ignition noise

[Kenneth L Wiltrout]

  For those of u that responded, Joe at Revmaster said what did I gap the
plugs  at, I told him since no instructions came with them I took the
average of what they were gapped at in the box and set them all at .030.
He said that is probably most of the problem, regap to .016 they are
trying too hard to fire and creating to much RF
energy---Does this make sense




> > ___
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> please see other KRnet info at http://www.krnet.org/info.html
> 
> 


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Surf the Web up to FIVE TIMES FASTER!
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