Tuesday, May 9, 2017

A Heat Insulation Spray-on Coating Alternative to Lizard Skin.

One of the well-known spray-on heat-shield products is Lizard Skin. From their website, “LizardSkin Ceramic Insulation (CI) is an advanced spray on thermal coating that consists of a water-based composition of high-grade acrylic binders with ceramic insulation particles to create a thermal barrier.” The material Safety Data Sheet can be found at

This sheet shows the composition of Lizard Skin as:

1 - Water 7732-18-5 40-50%
2 - Resin Polymer 00-00-00 20-30%
3 - Trade Secret Insulation Media 10-20%
4 - Carbon Black 1333-86-4 5-10%
5 - Extender Pigment 1317-65-3 1-5%

It’s relatively expensive at $200 for two gallons. They sell a special gun ($120) to spray it on although it can be applied with a brush or roller.

Substitutes
It's possible to make your won for much less cost.

1,2 – high solids white latex ceiling paint
3 – Glass microspheres https://en.wikipedia.org/wiki/Glass_microsphere
One suppler is HyTechSales.com, mixing at the rate of one quart of spheres per gallon of paint.
4 – This is added to give lizard skin its distinctive purple/black color. Any color is OK.

5 – Calcium carbonate, pulverized dolmitic limestone, adds bulk and texture, sourced at Amazon or hardware stores.

To spray, rent an airless paint sprayer, use the largest tip available and remove the filters screens from both the suction tube and inside the handle. The application thickness should be that of a credit card.

For heat and noise control, apply the spray-on coating, then add squares of DynaMat or similar product. It's not necessary to cover te entire panel ion DynaMat.

SOURCES

Long forum discussion of various substitutes and application details.

http://www.hotrodders.com/forum/alternative-lizard-skin-103610.html

http://www.hotrodders.com/forum/lizard-skin-application-questions-134551.html

http://www.crankshaftcoalition.com/wiki/Ceramic_insulation

http://www.hotrodders.com/forum/anyone-used-lizard-skin-77796.html

http://www.hotrodders.com/forum/kizard-skin-vs-dynamat-235881.html

Sunday, February 5, 2017

A more efficient fan shroud


Volvo has developed and patented this idea for their over the road trucks, but there's no reason it can't work on smaller vehicles. The ring surrounding the fan is fixed to the engine block so the ring can be much closer to the fan blades and so i more efficient. Not obvious from the diagram is that the fan shroud is a flexible material, sealed to the radiator and the ring.

Saturday, February 4, 2017

Preventing Over-heating and Corrosion In Your Car

For hotrod, sports cars and older cars, especially cars that are infrequently driven, overheating and corrosion are all too common problems.

Many people are surprised to learn that the traditional 50/50 mix of water and anti-freeze is not the most efficient way to cool your engines. Water alone is the most efficient medium, but there are two problems associated with water as the only coolant. First, water will freeze in the winter and usually cracks the engine block. Second, antifreeze includes corrosion inhibitors and water pump lubricant, both necessary for you cooling system.

Here's how to get around those problems.

  • Replace your drain petcock with a sacrificial zinc anode or have an appropriate-sized bung added to your radiator. These anodes are commonly used in marine engines and - surprise - the hot water heater in you house uses one. It's proven technology and you can buy them at boating supply stores or Amazon.
  • Add a surfactant like Water Wetter, available at auto parts stores. This product reduces the surface tension of the coolant keeping bubbles from forming, increasing coolant to metal contact and improving the transfer of heat to the coolant.
  • To replace the corrosion inhibitors and water pump coolant, just add a bottle of  the very same thing, also found at auto parts stores.
In the spring, drain the coolant from the system, add the above ingredients to refill your radiator and top off with distilled water (never tap water - too many minerals and electrolytes that will cause scale and corrosion). Most importantly, write down how much water you use to fill the radiator because when cold weather is upon us in the fall, drain one-half of the water and replace with anti-freeze whether you will be driving your car in the cold or not.

Every Spring: Lather. Rise. Repeat.