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Where did you mount the Lightspeed Plasma III box

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Mike Whisky

Joined: 05 Jun 2006
Posts: 336
Location: Switzerland

Posted: Sun Mar 09, 2008 10:40 am Post subject: Where did you mount the Lightspeed Plasma III box

Hi,



soon I'll come to the point where I will mount my Lightspeed Plasma III control box. I saw some pictures where it was mounted inside of the firewall. Where did you mount it?



Best Regards

Michael

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coop85(at)cableone.net
Guest

Posted: Sun Mar 09, 2008 11:14 am Post subject: Where did you mount the Lightspeed Plasma III box

Michael,

     I mounted mine on the sub panel behind the instrument panel.  I had

read somewhere that the heat in the engine compartment might not be a good

thing on the brain box so I wanted it behind the firewall.  I could

certainly be off on that thought.  Seems to work just fine.



Marcus

40286

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carl.froehlich(at)cox.net
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Posted: Sun Mar 09, 2008 11:21 am Post subject: Where did you mount the Lightspeed Plasma III box

I have dual Lightspeed II+ in my 8A.  I would not consider mounting the CDI module on the firewall side of the engine if for no reason other than heat.  These modules get hot by themselves.  You might want to ask Klaus about heat issues with the Plasma III.  Here is what his web site says:  

   

   

The PLASMA CDI module should be mounted in a clean and dry place on the cold side of the firewall.  If space limitations require mounting on the engine side of the firewall, a protective metal cover should be used to protect the module from water/engine cleaning materials and heat.  In this situation, the module should be oriented such that the connectors are to the sides of the plane.  Air must be allowed to flow between the bottom of the module and the mounting surface.  On 6-cylinder systems, cooling air should be supplied to the box via the cooling port on the 15-pin connector side of the ignition module.  For 6-cyl. systems that do not have a cooling port, contact LSE for this modification.  Cooling is not required for 4-cyl. systems.  

   

   

I would mount the modules in a cool spot and not on the back side of the firewall even if it is insulated.   Use standoffs to allow for air to circulate behind the modules.  Keep in mind you need to provide a blast tube for cooling.  I would assume you could rig up a cooling fan instead if a blast tube was too hard.  

   

BTW - I got a note back from eMag the other day.  They are progressing on their 6 cylinder ignition system but I did not get a target date for availability.  I am hoping these are on the market as an alternative to Lightspeed when I'm ready for the engine.  

   

Carl Froehlich  

RV-8A (400 hrs)  

RV-10 (wings)  

   

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Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Sun Mar 09, 2008 1:09 pm Post subject: Where did you mount the Lightspeed Plasma III box

While certainly not a proof of reliability, I had 320 hours of

perfect operation with my Plasma III....with no cooling port on

it.  I recently took advantage of the winter downtime and sent

it in for the cooling port and all additional updates that they

could do. I haven't added blast cooling air yet, but plan to as

soon as I care to lay under the panel again. 



What I did was mount mine on the firewall, cabin side, upper

area behind the pilots side of the firewall....way up

on that top curved area that is largely wasted space.

I mounted it and had stand-off rubber feet under it to ensure

that it had an air gap between it and the firewall.

Originally I mounted it with just screws and nuts, but

getting to it was a bit of a pain because I had to have

the wife turn the screws while I held the wrench.  So, when

it was out for the mods, I put nutplates on the box so that

now I can just put it in place and screw it in.  It's

definitely not in the most accessible area for removal,

but then again, it's something that you will rarely (hopefully)

have to remove.  Had I bought mine after the cooling port

became standard, I would have not had reason to remove it.

So it's kind of nice to use some of that wasted space.

Plus, being high on the firewall leaves for nice short

and easy to route RG-400 lines for the coil wires.



Not the best way, perhaps, but it's served me very well.

Having had so many hours without cooling ports, the heat

issue thing isn't a major fear for me...but I do think

it's best to go with any manufacturer recommendations

for sure.



Tim Olson - RV-10 N104CD - Flying



Carl Froehlich wrote:

 	  Quote: 	
		   I have dual Lightspeed II+ in my 8A.  I would not consider mounting the 

 CDI module on the firewall side of the engine if for no reason other 

 than heat.  These modules get hot by themselves.  You might want to ask 

 Klaus about heat issues with the Plasma III.  Here is what his web site 

 says:

 

  

 

  

 

 The PLASMA CDI module should be mounted in a clean and dry place on the 

 cold side of the firewall.  If space limitations require mounting on the 

 engine side of the firewall, a protective metal cover should be used to 

 protect the module from water/engine cleaning materials and heat.  In 

 this situation, the module should be oriented such that the connectors 

 are to the sides of the plane.  Air must be allowed to flow between the 

 bottom of the module and the mounting surface.  On 6-cylinder systems, 

 cooling air should be supplied to the box via the cooling port on the 

 15-pin connector side of the ignition module.  For 6-cyl. systems that 

 do not have a cooling port, contact LSE for this modification.  Cooling 

 is not required for 4-cyl. systems.

 

  

 

  

 

 I would mount the modules in a cool spot and not on the back side of the 

 firewall even if it is insulated.   Use standoffs to allow for air to 

 circulate behind the modules.  Keep in mind you need to provide a blast 

 tube for cooling.  I would assume you could rig up a cooling fan instead 

 if a blast tube was too hard.

 

  

 

 BTW - I got a note back from eMag the other day.  They are progressing 

 on their 6 cylinder ignition system but I did not get a target date for 

 availability.  I am hoping these are on the market as an alternative to 

 Lightspeed when I'm ready for the engine.

 

  

 

 Carl Froehlich

 

 RV-8A (400 hrs)

 

 RV-10 (wings)

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Mike Whisky

Joined: 05 Jun 2006
Posts: 336
Location: Switzerland

Posted: Mon Mar 17, 2008 3:31 am Post subject: Re: Where did you mount the Lightspeed Plasma III box

Thanks you guys for your help.



Michael

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#511

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