Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - View Single Post - CEL P0351 Ignition Coil "A" Primary Control Circuit/Open

gramicci101 · 03-21-2014, 11:21 AM

Here's a quick sketchup of a simple heat shield. The bolts holding the coils in are sunk into the engine, so I used the bolt just forward and below the front coil and two of the bolts above the coils. I couldn't see the back or bottom edges to locate mounting points, but the heat shield should attach there as well to prevent rattling. I don't have the capabilities right now to make this, but I'm sure someone like @Wonderbar or @GrimmSpeed could whip this up pretty quickly. The top and back are open to allow heat to escape. Gold foil on the outer surface to reflect heat away from the coils.

First Edit And you actually don't need the holes through the shield for the coil mounting bolts. I put those in when I was still considering that option for mounting the shield.

Second Edit Here's an additional tweak. I flared out the front edge to draw air from the engine bay over the coils, rather than have them sit with no air flow. This way, if the heat from the exhaust soaks through the heat shield during hard use, it can be flushed out with (hopefully) cooler air from the engine bay.

Third Edit If you wanted to get really frisky with it, you could rivet a heat sink to the inner surface. Using the airflow from the flared section on the leading edge, this would help to dissipate any heat that soaked through the reflective outer surface before it reached the coil.

I think that's about it from me for the moment. I always get caught up in incremental changes and improvements when I use sketchup.

03-21-2014, 11:21 AM	#94
gramicci101 Off Topic Join Date: Feb 2014 Drives: 2014 Subaru BRZ Limited Location: Vegas, baby! Posts: 4,610 Thanks: 2,369 Thanked 4,243 Times in 2,170 Posts Mentioned: 43 Post(s) Tagged: 3 Thread(s)	Here's a quick sketchup of a simple heat shield. The bolts holding the coils in are sunk into the engine, so I used the bolt just forward and below the front coil and two of the bolts above the coils. I couldn't see the back or bottom edges to locate mounting points, but the heat shield should attach there as well to prevent rattling. I don't have the capabilities right now to make this, but I'm sure someone like @Wonderbar or @GrimmSpeed could whip this up pretty quickly. The top and back are open to allow heat to escape. Gold foil on the outer surface to reflect heat away from the coils. First Edit And you actually don't need the holes through the shield for the coil mounting bolts. I put those in when I was still considering that option for mounting the shield. Second Edit Here's an additional tweak. I flared out the front edge to draw air from the engine bay over the coils, rather than have them sit with no air flow. This way, if the heat from the exhaust soaks through the heat shield during hard use, it can be flushed out with (hopefully) cooler air from the engine bay. Third Edit If you wanted to get really frisky with it, you could rivet a heat sink to the inner surface. Using the airflow from the flared section on the leading edge, this would help to dissipate any heat that soaked through the reflective outer surface before it reached the coil. I think that's about it from me for the moment. I always get caught up in incremental changes and improvements when I use sketchup. Last edited by gramicci101; 03-21-2014 at 12:02 PM.