Heat Shielding
I had two heat problems with the car. First, the exhaust was too close to the fuel lines. On two occasions, upon driving home, I couldn’t use more than a touch of throttle without the engine dying. I think the hot exhaust was heating the fuel supply and return lines and was vaporizing the fuel. The first photo shows the proximity of the fuel lines to the exhaust headers. Unfortunately this photo has the turkey pan installed, but you can see how close the perhaps 1000 degree exhausts are from the fuel lines.
I built a turkey pan to attach to the throttles. This required a lot of trimming to get the pan around the machined surfaces of the throttle bodies. There is also an aluminum lip going down below the throttles to the base of the intake manifold.
My first attempt was to simply put the Design Engineering Inc. Heat Shield with fiberglass and self-adhesive on the back of the turkey pan by the exhausts (as shown in the first photo). That didn’t hold up, so my second design was to use two aluminum plates with the Heat Shield and an air gap between them. If you look closely you can see the air gap. That seems to work fine.
The second problem was the heat going into the rear clamshell. I did use both LizardSkins on the rear clamshell. But the fiberglass being about 2 inches from the exhausts headers meant that a lot of heat was going into the bodywork despite the LizardSkin. As a matter of fact, the LizardSkin flaked off in an area just above the headers by the turkey pan. This is in response by a comment made by Rick Muck on Bill Kearley’s post #21. Not only did the LizardSkin flake off, but the outside temperature of the clamshell was excessive. I’m surprised that the fiberglass or paint wasn’t damaged.
https://www.gt40s.com/threads/bills-cav-193-build-canadian-made.52505/page-2
My solution was to build an aluminum plate to shield the rear clamshell from all of the exhaust headers. I put the Heat Shield fiberglass insulation on the other side of the aluminum plate to provided even more insulation in addition to some natural air gaps. Since I couldn’t drill holes in the painted part of the clamshell I bolted it in three places. I used bolts in the muffler vent plate on the rear clamshell, on the vertical tire shield, and the interior lip in the front of the clamshell. Now, the outside of the clamshell is not blisteringly hot and is somewhat cool. It also reduced some of the noise form the engine bay into the cockpit.
I consider both of these as serious problems. I’m glad I fixed them.