Poor Man's Cold Air Induction System - 4 cylinder Lycomings. You've seen similar systems on race cars and tuner cars, and now you can install an inexpensive cold air system on your aircraft. These aluminized ceramic insulated sleeves are designed to fit over your Lycoming induction tubes to help reduce the amount of heat picked up by your induction air from the nearby hot exhaust pipes. Cooler air means more horsepower!
Other cold air induction systems require that the oil sump be changed at a cost of hundreds or thousands of dollars. And you still have the induction tubes exposed to the hot exhaust pipes and cooling fin radiant heat.
The Poor Man's Cold Air Induction System requires only simple removal of the intake tubes, cutting and installing the aluminized ceramic sleeves, and reinstalling the intake tubes. Enough Heat Shield Mat is included to cover the intake hoses facing the exhaust pipes, which greatly prolongs the life of the intake hoses.
Everything you need to do the job properly is included:
4' of aluminized ceramic sleeve
4 AEL71973 Lycoming intake gaskets
4 SL69603 Lycoming intake hoses
1 piece of Heat Shield Mat
1 package of 16 stainless steel tie wraps
While the induction air still must travel a short distance through the oil sump, remember that the oil sump is only 200F while the exhaust pipes are typically around 1400F. Dollar for dollar, you should expect much of the benefit of a true cold air induction system at a small fraction of the cost!
Please double check the lengths of your intake pipes to ensure that you will receive enough ceramic sleeve. Also check to make sure that the gaskets and hoses provided are suitable for your engine! Other sizes are available but not listed here. Call or email for more info.
I occasionally have guys ask for an instruction sheet for this product. There really aren't any specific instructions as it can vary a bit per plane. Basically, you remove the intake pipes as needed, cut the sleeves to length and slip them over the intake pipes. The remaining material is to be added as required to keep the exhaust heat off of the intake rubber hoses, motor mounts, or other heat sensitive parts.
When I added these items to my plane, I did so initially to protect the rubber parts near the exhaust pipes. Getting a noticeable change in the induction tuning (injector tuning) was a pleasant side benefit that I must assume is because of heat rejection.
FWIW, several notable RV experts (not me!) claim to have hard data that says that this simple idea does work.