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lightspeed ignition troubleshooting

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brunk

Joined: 08 Jan 2013
Posts: 24
Location: Corpus Christi, texas

Posted: Mon Jun 24, 2013 6:18 am Post subject: lightspeed ignition troubleshooting

On Jun 24, 2013, at 9:16 AM, Robert Brunkenhoefer <robert(at)brunklaw.com> wrote:



 	  Quote: 	
		   I have been trying to troubleshoot a drop of 250 rpm on run up on my light speed side. I usually get 0 drop. I also show a 250 degree rise above the other cylinders in the 3 and 4 egt. Cht is normal for all. I have done all the troubleshooting in the manual supplied by Klaus. We have spoken a lot about this problem. I would like to fly my plane somewhere nearby to someone who is familiar withs these units so I can get back to the perfect way it was for 5000 plus hours. thanks. I am based at KCRP, corpus christi , texas. Robert Brunkenhoefer N661G  600 hours plus

_________________
Robert E. Brunkenhoefer

Bob Collins

Joined: 11 Mar 2006
Posts: 470
Location: St. Paul, Minnesota

Posted: Mon Jun 24, 2013 6:34 am Post subject: lightspeed ignition troubleshooting

So when you take the coil-to-plug leads off and you pull the prop 

through, you're getting the spark jumping across the leads on the coil, 

right? And at the right time?

On 6/24/2013 9:17 AM, Robert Brunkenhoefer wrote:

 	  Quote: 	
		   

 On Jun 24, 2013, at 9:16 AM, Robert Brunkenhoefer <robert(at)brunklaw.com> wrote:



> I have been trying to troubleshoot a drop of 250 rpm on run up on my light speed side. I usually get 0 drop. I also show a 250 degree rise above the other cylinders in the 3 and 4 egt. Cht is normal for all. I have done all the troubleshooting in the manual supplied by Klaus. We have spoken a lot about this problem. I would like to fly my plane somewhere nearby to someone who is familiar withs these units so I can get back to the perfect way it was for 5000 plus hours. thanks. I am based at KCRP, corpus christi , texas. Robert Brunkenhoefer N661G  600 hours plus

_________________
Bob Collins
St. Paul, Minn.
Letters from Flyover Country
http://rvnewsletter.blogspot.com/

brunk

Joined: 08 Jan 2013
Posts: 24
Location: Corpus Christi, texas

Posted: Mon Jun 24, 2013 6:39 am Post subject: Re: lightspeed ignition troubleshooting

Yes, that is correct. spark plug leads were replaced and coil to 3 and 4 was replaced, as well as all spark plugs. connections were checked on both ends of the system.

_________________
Robert E. Brunkenhoefer

dave.saylor.aircrafters(a
Guest

Posted: Mon Jun 24, 2013 6:40 am Post subject: lightspeed ignition troubleshooting

I've found LS to be pretty sensitive to dirty plugs. It's early on the troubleshooting checklist but even of they looked ok you might try a new set. I just had that work for me under similar circumstances. In my case the plugs were only 3 hours old and just looked a little used but not bad at all.  New plugs did the trick. 

 

On Monday, June 24, 2013, Robert Brunkenhoefer  wrote:

 	  Quote: 	
		  --> RV-List message posted by: Robert Brunkenhoefer <[url=javascript:;]robertbrunk(at)mac.com[/url]>

  

 

 On Jun 24, 2013, at 9:16 AM, Robert Brunkenhoefer <[url=javascript:;]robert(at)brunklaw.com[/url]> wrote:

 

 > I have been trying to troubleshoot a drop of 250 rpm on run up on my light speed side. I usually get 0 drop. I also show a 250 degree rise above the other cylinders in the 3 and 4 egt. Cht is normal for all. I have done all the troubleshooting in the manual supplied by Klaus. We have spoken a lot about this problem. I would like to fly my plane somewhere nearby to someone who is familiar withs these units so I can get back to the perfect way it was for 5000 plus hours. thanks. I am based at KCRP, corpus christi , texas. Robert Brunkenhoefer N661G  600 hours plus

  

 

 

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-- 

Dave Saylor

831-750-0284 CL

  [quote][b]

rv8a2001(at)yahoo.com
Guest

Posted: Mon Jun 24, 2013 7:42 am Post subject: lightspeed ignition troubleshooting

Do you have the old RG-58 coax cable to the coils? This caused me trouble, replaced it with RG-400 cable problem solved.



 

Scott



        From: brunk <robertbrunk(at)mac.com>

 To: rv-list(at)matronics.com 

 Sent: Monday, June 24, 2013 7:39 AM

 Subject: Re: lightspeed ignition troubleshooting

  

 

 --> RV-List message posted by: "brunk" <robertbrunk(at)mac.com (robertbrunk(at)mac.com)>



Yes, that is correct. spark plug leads were replaced and coil to 3 and 4 was replaced, as well as all spark plugs. connections were checked on both ends of the system.



--------

Robert E. Brunkenhoefer





Read this topic online here:



http://forums.matronics.c;                   -Matt Dral=============

 

 

  

 [quote][b]

brunk

Joined: 08 Jan 2013
Posts: 24
Location: Corpus Christi, texas

Posted: Mon Jun 24, 2013 7:43 am Post subject: Re: lightspeed ignition troubleshooting

Dave, I replaced the plugs with new ones and experienced no change from that.

_________________
Robert E. Brunkenhoefer

brunk

Joined: 08 Jan 2013
Posts: 24
Location: Corpus Christi, texas

Posted: Mon Jun 24, 2013 10:49 am Post subject: Re: lightspeed ignition troubleshooting

This is the original coax cable . I do not know the number of it. Would it cause the symptoms I described? Was that your problem it corrected?

_________________
Robert E. Brunkenhoefer

Bob Collins

Joined: 11 Mar 2006
Posts: 470
Location: St. Paul, Minnesota

Posted: Mon Jun 24, 2013 11:11 am Post subject: lightspeed ignition troubleshooting

If you're getting a spark jumping across the leads, I doubt it's the 

coax. You've changed the spark plugs (and the copper washers, right?) 

and if you're EGT is going up , those plugs aren't firing. The next 

thing I would eliminate as a possible cause are the wires from the 

coil(s) to the individual plugs.  Assuming you've doublechecked to be 

sure these didn't somehow get routed to the wrong plugs (ask me how 

know), try swapping the wires, disconnecting them from the coils and 

plugs and connecting them to another (appropriate) coil and another 

(appropriate) plug and see if that same plug doesn't fire or if another 

plug becomes the one that doesn't fire.



Assuming nothing changes, I think you've eliminated the Lightspeed as 

the cause and we can start just diagnosing the only three things it can 

be from there forward :  spark, fuel, or air, and we might be able to 

eliminate spark.

On 6/24/2013 1:49 PM, brunk wrote:

 	  Quote: 	
		   



 This is the original coax cable . I do not know the number of it. Would it cause the symptoms I described? Was that your problem it corrected?



 --------. dd

 Robert E. Brunkenhoefer





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=403333#403333

_________________
Bob Collins
St. Paul, Minn.
Letters from Flyover Country
http://rvnewsletter.blogspot.com/

rv8a2001(at)yahoo.com
Guest

Posted: Mon Jun 24, 2013 3:04 pm Post subject: lightspeed ignition troubleshooting

The RG 58 is black.

I had a strange intermittent miss when turning off one ignition. One thing to remember is RG 58 was designed for WWII aircraft. RG 400 is MODERN! RG 58 is NOT designed to handle under cowl temps. Especially the center conductor insulation.



Sent from my iPhone



On Jun 24, 2013, at 11:49 AM, "brunk" <robertbrunk(at)mac.com> wrote:



 	  Quote: 	
		   

 

 This is the original coax cable . I do not know the number of it. Would it cause the symptoms I described? Was that your problem it corrected?

 

 --------

 Robert E. Brunkenhoefer

 

 

 

 

 Read this topic online here:

 

 http://forums.matronics.com/viewtopic.php?p=403333#403333

vshimsl(at)live.com
Guest

Posted: Mon Jun 24, 2013 3:16 pm Post subject: LightSpeed ignition troubleshooting

Hi,

250 RPM drop compared to what read by what at what  RPM setting? Run up

implies 17 to 18 hundred rpm. Are you using the digital or analog rpm signal

from the LightSpeed? CHT temps should drop, at least they do for me, when a

cylinder is not firing. But yours are 'normal'. Do you hear/feel the RPM

drop or is your only indication an instrument RPM reading drop? Your

tachometer could be missing pulses (if digital) from the LIghtSpeed, and

your tachometer is a...?



Thanks,

VinceH

RV8 Flying

On Jun 24, 2013, at 9:16 AM, Robert Brunkenhoefer <robert(at)brunklaw.com>

wrote:



 	  Quote: 	
		   I have been trying to troubleshoot a drop of 250 rpm on run up on my 

 light speed side. I usually get 0 drop. I also show a 250 degree rise 

 above the other cylinders in the 3 and 4 egt. Cht is normal for all. I 

 have done all the troubleshooting in the manual supplied by Klaus. We 

 have spoken a lot about this problem. I would like to fly my plane 

 somewhere nearby to someone who is familiar withs these units so I can 

 get back to the perfect way it was for 5000 plus hours. thanks. I am 

 based at KCRP, corpus christi , texas. Robert Brunkenhoefer N661G  600 

 hours plus

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