How to Keep Exhaust Temperatures Down

Header Coatings Keep Engine Temps Down

Anytime you modify or “hop up” your engine to get more horsepower it will produce more heat. That heat can travel through the engine bay and into your vehicle causing discomfort. One way to drop the temperatures of your engine bay is to keep your headers or manifolds from radiating so much heat. External coatings can help, but if you want your headers bare you might not want to coat them and hurt the appearance.

Eastwood Internal Exhaust Coating

Internal Header Coating is a necessary step to building a customized or performance based vehicle. We suggest coating the inside of the pipes with Eastwood Internal Header Coating for two reasons. The first is because it keeps the heat from the exhaust gases inside the pipes as opposed to the pipes radiating heat and raising under hood temperatures. By coating the inside of the pipes it gives a hi-temp barrier between the exhaust gases and the metal of the headers.

Exhaust Systems Rust From the Inside Out

The second reason internal exhaust coating is important is that most exhaust systems rust from the inside out because of the moisture that a cold engine can product when you first run it and the changes in temperature. By coating the inside of the pipes of cast iron or steel pipes you will seal the bare metal up from rusting and allow them to last a lifetime.

Application is simple, start by using an air nozzle and blowing any debris from inside the pipes out. Then you can spray PRE Paint Prep Can to clean out the pipes and dry with your air nozzle.

Once the PRE is dry you can attach your extension nozzle to your can and keep some rags with PRE Paint Prep next to the work area. You can start with the nozzle all the way inside of each pipe and as you spray pull the extension out of the pipe. As you get close let off of the nozzle and pull it out to move to the next pipe. The conical spray pattern of the nozzle should cover the majority of the inside of the pipes but you can rotate the headers, manifolds, or pipes around while the paint is still wet to assure it covers every square inch.

After everything is coated you can follow up with a rag and PRE to wipe off any over spray or runs on the exterior of the pipes. If the paint is still wet it should remove easily, but once it dries it is VERY difficult to get off. After 6-8 hours you can install the pipes and run the car. The first heat cycle will fully cure the coating and then the engine can be run as normal.

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