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Impulse mag top/bottom

 
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bo124rs(at)hotmail.com
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PostPosted: Fri Oct 27, 2006 5:24 am    Post subject: Impulse mag top/bottom Reply with quote

OK, I've seen/heard/read/dreamed (stretching it there:-) about putting the
impulse mag harness on the top plugs only with the right mag (looking at it
from the the rear of the engine) on the bottom only. Obviously, the
harnesses are marked T4, T2, B3, B1 and B4, B2, T3, T1. Put them is this
orientation, the arguement is you get a more consistantly close drop between
left and right. The assumption; the bottom plugs are more likely to get oil
fouled due to gravity.

Current pros, cons to harness indicated orientation or top/bottom only???

Just food for thought after looking at a one mag/electronic setup where the
builder did the electronic on top plugs only and mag on bottom plugs only.

Dana Overall
Richmond, KY i39
RV-7 slider, Imron black, "Black Magic"
O 360 A1A, C/S C2YK-1BF/F7666A4
http://rvflying.tripod.com/id30.html
do not archive

_________________________________________________________________
Use your PC to make calls at very low rates
https://voiceoam.pcs.v2s.live.com/partnerredirect.aspx


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Gary.A.Sobek



Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA

PostPosted: Fri Oct 27, 2006 6:53 am    Post subject: Impulse mag top/bottom Reply with quote

Dana:

One Electronic Ignition Manufacturer recommends that you install his EI on
the spark plugs on the top in each cylinder if you are using one mag and one
EI. I am not sure why other than becasue he knows the bottom plugs will
lead foul and make his system look better than the mag.

I would not put all top and all bottom plugs on a single mag in a dual mag
ignition airplane. The bottom plugs will lead foul. If they are on one mag
and lead fouled at the time the other mag fails, you will have two degraded
ignition systems. If both mags fire two bottom, you should at least have
two cylinders firing and should make it to the nearest airport.

I would not put all top spark plug on one mag and all bottom spark plugs on
the other mag.

Gary A. Sobek
"My Sanity" RV-6 N157GS O-320 Hartzell,
1,963 + Flying Hours So. CA, USA

----Original Message Follows----
From: "Dana Overall" <bo124rs(at)hotmail.com>
Reply-To: rv-list(at)matronics.com
To: rv-list(at)matronics.com
Subject: Impulse mag top/bottom
Date: Fri, 27 Oct 2006 09:23:41 -0400



OK, I've seen/heard/read/dreamed (stretching it there:-) about putting the
impulse mag harness on the top plugs only with the right mag (looking at it
from the the rear of the engine) on the bottom only. Obviously, the
harnesses are marked T4, T2, B3, B1 and B4, B2, T3, T1. Put them is this
orientation, the arguement is you get a more consistantly close drop between
left and right. The assumption; the bottom plugs are more likely to get oil
fouled due to gravity.

Current pros, cons to harness indicated orientation or top/bottom only???

Just food for thought after looking at a one mag/electronic setup where the
builder did the electronic on top plugs only and mag on bottom plugs only.

Dana Overall
Richmond, KY i39
RV-7 slider, Imron black, "Black Magic"
O 360 A1A, C/S C2YK-1BF/F7666A4
http://rvflying.tripod.com/id30.html
do not archive

_________________________________________________________________
Use your PC to make calls at very low rates
https://voiceoam.pcs.v2s.live.com/partnerredirect.aspx

_________________________________________________________________
Use your PC to make calls at very low rates
https://voiceoam.pcs.v2s.live.com/partnerredirect.aspx


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kboatright1(at)comcast.ne
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PostPosted: Fri Oct 27, 2006 2:09 pm    Post subject: Impulse mag top/bottom Reply with quote

I put the plugs fired from my electronic ignition on the top and the mag
fired plugs on the bottom. My reasoning was that the EI plug wires attach
with friction and by installing 'em on the top plugs, gravity was working in
my favor as opposed to against me. Also, my assumption is/was that if the
EI driven stuff was on top, it would be easier to visually inspect.

In 425 hours, I have not fouled a plug on either system.

KB
---


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bobbyhester(at)charter.ne
Guest





PostPosted: Fri Oct 27, 2006 9:04 pm    Post subject: Impulse mag top/bottom Reply with quote

Dana, I installed my system per the directions from Lightspeed. LH Mag
supplies the bottom plugs and RH Electronic Ign. supplies the top auto
type plugs. I'm sure you will find that anyone using the lightspeed
system on only one side has done this.

------
Surfing the web from my laptop in Hopkinsville, KY
Visit my RV7A site: http://www.geocities.com/hester-hoptown/RVSite/

Dana Overall wrote:

Quote:


OK, I've seen/heard/read/dreamed (stretching it there:-) about putting
the impulse mag harness on the top plugs only with the right mag
(looking at it from the the rear of the engine) on the bottom only.
Obviously, the harnesses are marked T4, T2, B3, B1 and B4, B2, T3, T1.
Put them is this orientation, the arguement is you get a more
consistantly close drop between left and right. The assumption; the
bottom plugs are more likely to get oil fouled due to gravity.

Current pros, cons to harness indicated orientation or top/bottom only???

Just food for thought after looking at a one mag/electronic setup
where the builder did the electronic on top plugs only and mag on
bottom plugs only.

Dana Overall
Richmond, KY i39
RV-7 slider, Imron black, "Black Magic"
O 360 A1A, C/S C2YK-1BF/F7666A4
http://rvflying.tripod.com/id30.html
do not archive

_________________________________________________________________
Use your PC to make calls at very low rates
https://voiceoam.pcs.v2s.live.com/partnerredirect.aspx



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FLYaDIVE(at)aol.com
Guest





PostPosted: Sat Oct 28, 2006 4:33 am    Post subject: Impulse mag top/bottom Reply with quote

In a message dated 10/28/2006 1:06:10 AM Eastern Standard Time, bobbyhester(at)charter.net writes:
Quote:
--> RV-List message posted by: Bobby Hester <bobbyhester(at)charter.net>

Dana, I installed my system per the directions from Lightspeed. LH Mag
supplies the bottom plugs and RH Electronic Ign. supplies the top auto
type plugs. I'm sure you will find that anyone using the lightspeed
system on only one side has done this.

------
Surfing the web from my laptop in Hopkinsville, KY
Visit my RV7A site: http://www.geocities.com/hester-hoptown/RVSite/

Dana Overall wrote:

Quote:
--> RV-List message posted by: "Dana Overall" <bo124rs(at)hotmail.com>

OK, I've seen/heard/read/dreamed (stretching it there:-) about putting
the impulse mag harness on the top plugs only with the right mag
(looking at it from the the rear of the engine) on the bottom only.
Obviously, the harnesses are marked T4, T2, B3, B1 and B4, B2, T3, T1.
Put them is this orientation, the arguement is you get a more
consistantly close drop between left and right. The assumption; the
bottom plugs are more likely to get oil fouled due to gravity.

Current pros, cons to harness indicated orientation or top/bottom only???

Just food for thought after looking at a one mag/electronic setup
where the builder did the electronic on top plugs only and mag on
bottom plugs only.

Dana Overall
Richmond, KY i39
RV-7 slider, Imron black, "Black Magic"
O 360 A1A, C/S C2YK-1BF/F7666A4
http://rvflying.tripod.com/id30.html
do not archive

===================================

Group:

My feelings on which system and where are as follows:
MAG - On TOP : CDI - On BOTTOM - Why?
Mags do not put out as much angary as a CDI (Capacitive Discharge Ignition).
Top Plugs tend to stay cleaner than bottom plugs.
Bottom Plugs are susceptible to Oil Fouling.
By putting the Mag on top there is better chance of getting a clean plug and a good spark for starting.
By putting the CDI on the bottom the hotter spark will have a better chance of burning through any oil and carbon formed by the oil.
With the CDI on the bottom a larger gap can be set on the plugs which means a less chance of lead fouling. If you are one that uses AvGas.
With the CDI on the bottom you will have access to the lower plugs much easier than the top and that means you can PLAY with the heat range, gap and manufactures swapping of plugs much easier.



Barry
"Chop'd Liver"

[quote][b]


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Tim(at)MyRV10.com
Guest





PostPosted: Sat Oct 28, 2006 4:38 am    Post subject: Impulse mag top/bottom Reply with quote

Same here, mine are Lightspeed top, and Mags bottom. Engine runs
great....better than I imagined. There are tons of systems
with lightspeeds set up this way. I'd say, if you use 2 mags,
do it the way the mag manufacturer says. If you use EI, then
do it the way your EI manufacturer says. It's not worth the
mental cycles rethinking it, because there's enough evidence
that what's being suggest does indeed work well.

Tim Olson - RV-10 N104CD - Flying
do not archive
Bobby Hester wrote:
Quote:


Dana, I installed my system per the directions from Lightspeed. LH Mag
supplies the bottom plugs and RH Electronic Ign. supplies the top auto
type plugs. I'm sure you will find that anyone using the lightspeed
system on only one side has done this.

------
Surfing the web from my laptop in Hopkinsville, KY
Visit my RV7A site: http://www.geocities.com/hester-hoptown/RVSite/



Dana Overall wrote:

>
>
> OK, I've seen/heard/read/dreamed (stretching it there:-) about putting
> the impulse mag harness on the top plugs only with the right mag
> (looking at it from the the rear of the engine) on the bottom only.
> Obviously, the harnesses are marked T4, T2, B3, B1 and B4, B2, T3, T1.
> Put them is this orientation, the arguement is you get a more
> consistantly close drop between left and right. The assumption; the
> bottom plugs are more likely to get oil fouled due to gravity.
>
> Current pros, cons to harness indicated orientation or top/bottom only???
>
> Just food for thought after looking at a one mag/electronic setup
> where the builder did the electronic on top plugs only and mag on
> bottom plugs only.
>
> Dana Overall
> Richmond, KY i39
> RV-7 slider, Imron black, "Black Magic"
> O 360 A1A, C/S C2YK-1BF/F7666A4
> http://rvflying.tripod.com/id30.html
> do not archive
>
> _________________________________________________________________
> Use your PC to make calls at very low rates
> https://voiceoam.pcs.v2s.live.com/partnerredirect.aspx
>






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bertrv6(at)highstream.net
Guest





PostPosted: Sat Oct 28, 2006 4:48 am    Post subject: Impulse mag top/bottom Reply with quote

Quoting Kyle Boatright <kboatright1(at)comcast.net>:

[quote]

I put the plugs fired from my electronic ignition on the top and the mag
fired plugs on the bottom. My reasoning was that the EI plug wires attach
with friction and by installing 'em on the top plugs, gravity was working in
my favor as opposed to against me. Also, my assumption is/was that if the
EI driven stuff was on top, it would be easier to visually inspect.

In 425 hours, I have not fouled a plug on either system.

KB
---


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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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cjensen(at)dts9000.com
Guest





PostPosted: Sat Oct 28, 2006 5:11 am    Post subject: Impulse mag top/bottom Reply with quote

Barry,
I understand your philosophy of putting the most robust system on the bottom where it is better equipped to withstand the harsher operating environ. However, a counter philosophy is to put the Mag on the bottom. It's known to be less tolerate of oil and lead fouling and will act as an early warning system if there is a problem starting to develop. Should the lower mag plugs start to foul, you'll still have a wide margin for continued operation of the upper CDI plugs before they start to degrade also.

I guess that's why the put the canary deep in the mine instead of in the break room. The weakest link serves as the earliest warning system when put at most risk. Just a thought.

Chuck Jensen
Group:

My feelings on which system and where are as follows:
MAG - On TOP : CDI - On BOTTOM - Why?
Mags do not put out as much angary as a CDI (Capacitive Discharge Ignition).
Top Plugs tend to stay cleaner than bottom plugs.
Bottom Plugs are susceptible to Oil Fouling.
By putting the Mag on top there is better chance of getting a clean plug and a good spark for starting.
By putting the CDI on the bottom the hotter spark will have a better chance of burning through any oil and carbon formed by the oil.
With the CDI on the bottom a larger gap can be set on the plugs which means a less chance of lead fouling. If you are one that uses AvGas.
With the CDI on the bottom you will have access to the lower plugs much easier than the top and that means you can PLAY with the heat range, gap and manufactures swapping of plugs much easier.



Barry
"Chop'd Liver"

[quote] [b]


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bo124rs(at)hotmail.com
Guest





PostPosted: Sat Oct 28, 2006 5:30 am    Post subject: Impulse mag top/bottom Reply with quote

Quote:
>
> I do not know anything about this, but doesn't the system comes
with Instructions, how to connect? IF IT DOES, WHY THE DOUBTS

AND QUESTIONS/ Just curious?

Bert

Bert, the reason being there are people out there who support the
installation of the impulse mag on the top plugs and right mag on bottom.
Their reasoning is ease of starting due to cleaner top plugs. Just a
thought I had while installing mine per instructions....................it
happens occasionally:-)

Dana Overall
Richmond, KY i39
RV-7 slider, Imron black, "Black Magic"
O 360 A1A, C/S C2YK-1BF/F7666A4
http://rvflying.tripod.com/id30.html
do not archive


[quote]From: bertrv6(at)highstream.net
Reply-To: rv-list(at)matronics.com
To: rv-list(at)matronics.com
Subject: Re: Impulse mag top/bottom
Date: Sat, 28 Oct 2006 08:48:06 -0400



Quoting Kyle Boatright <kboatright1(at)comcast.net>:

>
<kboatright1(at)comcast.net>
>
> I put the plugs fired from my electronic ignition on the top and the mag
> fired plugs on the bottom. My reasoning was that the EI plug wires
attach
> with friction and by installing 'em on the top plugs, gravity was
working in
> my favor as opposed to against me. Also, my assumption is/was that if
the
> EI driven stuff was on top, it would be easier to visually inspect.
>
> In 425 hours, I have not fouled a plug on either system.
>
> KB
> ---


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FLYaDIVE(at)aol.com
Guest





PostPosted: Sat Oct 28, 2006 5:31 am    Post subject: Impulse mag top/bottom Reply with quote

Hi Chuck:

I can also understand your approach.  My only issue is that I don't want to find that dead canary when I am at an away AP, without any tools and cranking away, draining the battery ... Trying to get the engine to fire.
I have the Bottom CDI system in the RV-6 and the engine purrs. Not because if where the CDI & Mag are mounted but because it started. Wink
SURE it will work the other way but I just felt this was a better option.
Hey, just for S&Gs one method of wiring from Lycoming is to split the harness. Half of the Left Mag supplies two upper and two lower and the same is true for the right Mag. That also helps ballance things out when you consider a failure mode.

Barry

===============
Barry,
I understand your philosophy of putting the most robust system on the bottom where it is better equipped to withstand the harsher operating environ. However, a counter philosophy is to put the Mag on the bottom. It's known to be less tolerate of oil and lead fouling and will act as an early warning system if there is a problem starting to develop. Should the lower mag plugs start to foul, you'll still have a wide margin for continued operation of the upper CDI plugs before they start to degrade also.

I guess that's why the put the canary deep in the mine instead of in the break room. The weakest link serves as the earliest warning system when put at most risk. Just a thought.

Chuck Jensen
Group:

My feelings on which system and where are as follows:
MAG - On TOP : CDI - On BOTTOM - Why?
Mags do not put out as much angary as a CDI (Capacitive Discharge Ignition).
Top Plugs tend to stay cleaner than bottom plugs.
Bottom Plugs are susceptible to Oil Fouling.
By putting the Mag on top there is better chance of getting a clean plug and a good spark for starting.
By putting the CDI on the bottom the hotter spark will have a better chance of burning through any oil and carbon formed by the oil.
With the CDI on the bottom a larger gap can be set on the plugs which means a less chance of lead fouling. If you are one that uses AvGas.
With the CDI on the bottom you will have access to the lower plugs much easier than the top and that means you can PLAY with the heat range, gap and manufactures swapping of plugs much easier.



Barry
"Chop'd Liver"

[quote][b]


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ronlee(at)pcisys.net
Guest





PostPosted: Sat Oct 28, 2006 6:23 am    Post subject: Impulse mag top/bottom Reply with quote

I have my impulse mag on the bottom plugs...EI on the top.
Perhaps 800 hours with maybe three cases of a fouled plug
that did clear without removing the plug. Proper leaning while
taxiing will go a long way to preventing fouled plugs.

Ron Lee


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