The figures used to calculate power gains due to the reduction in intake temperatures are taken from Banks Power, see link. Design 3– Cone filter completely enclosed filter with cold air feed tube feeding from under the car

I tried air filter heat shields in 4 different designs to see which was the most effective at reducing inlet temps. We want to know

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Due to the laws of thermodynamics, anything that uses energy or performs work will inevitably produce a by-product in the form of heat. A car is no exception to this law and features various components which produce heat, some more than others. In most cases however, heat can have a detrimental impact on the performance of certain engine components. Urban driving: hp gain max: + 6.8hpwhen using heat shields – (intake temps 14C lower with heat shields over standard air box). Heat shields should surround the cone filter an ALL sides, except the side facing the front of the car so the filter can receive air when the car is moving. Isolate from warm air that has passed through the radiator if necessary. To test the temperatures on the road, a route was devised which took in Urban Roads, Open Roads and Motorways. An open cone filter could give less power than standard air filter, if standard air filter is not a restriction.

The air filter heat shields can increase *power by4.5% (6.8hp)on a150hpengine. Inlet air temperatures dropped by 14C. Cold air intakes and sealedinduction kits such as the Viper from Pipercross combine an induction kit with a sealed enclosure. This enables the engine to breathe in colder air than even the standard intake system as well as being freer flowing than the standard paper air filter element. However these sealed induction kits do tend to be more expensive than the open type induction kit but they should produce more power. Ducting routed next to the engine should NOT be used as the ducting is heated by the engine/exhaust. Design 4 gave the best results. Isolating filter completely from engine bay but leaving the filter exposed to the air entering the engine bay. No cold air feed was necessary. The temperature was monitored on the route to determine the trends in the temperature changes, the max temperatures and minimum temperatures.

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These gains solely take into consideration the hp gains due to lower temps and not the hp gains that the induction filter may also bring. Open road driving: average gain + 4.38hpwith heat shields – (intake temps 9C lower with heat shields over standard air box.) The idle temperature was taken by running the engine up to operating temperature with the bonnet open.