jeep 40l Engine Rebuild - temperature Probe - Photo 16840689

Back to Article

10. The Airaid intake tube is made of plastic that further insulates engine airflow from underhood heat sources. Notice the intake air-temperature probe; Airaid includes a hole that easily accommodates this critical sensor, so no drilling is necessary.

129 0902 07 z+jeep 40l engine rebuild+compare manifold

1. To generate data that we could actually use, we first had to get some baseline dyno numbers. To do this we simply drove down to our local dyno facility and made three runs with the original equipment intact. No aftermarket modifications existed when we generated this data. Peak power was 126.4 hp @ 4,474 rpm and 176 lb-ft of torque @ 2,385 rpm-not bad, considering this Jeep had only 25,000 miles on it and an automatic transmission.

2. This is the JBA Cat4Ward header as it came to us. This product is available in raw stainless as shown here, or if you want to pony up another 200 bucks, you can get it with a ceramic coating to reduce underhood temps. We decided to keep things simple to reduce costs.

3. The JBA header requires that you remove the factory intake manifold to gain access to the exhaust manifold. Here you can see the JBA technician removing the intake manifold from the Jeep.

4. With the factory intake manifold removed, the OE cast-iron exhaust manifold could be seen. Notice the rusty color of this part. Rust is the number one enemy to a vehicle's exhaust system; that's why JBA constructs its headers out of nonrusting stainless steel material.

129 0902 07 z+jeep 40l engine rebuild+compare manifold

129 0902 08 z+jeep 40l engine rebuild+head flange

7. All JBA headers come with high-quality EnCore exhaust gaskets that are made by Interface Solutions right here in the U.S. EnCore HTX-900 is a composite gasket structure consisting of graphite-coated, high-temperature facing material chemically and mechanically fused to an expanded steel core. These gaskets are built to last.

8. It's always a good idea to use a high-temp antiseize lubricant at the flange mating surface. This allows the joint to move easily should the exhaust strike an object or flex due to high temperature.

129 0902 14 z+jeep 40l engine rebuild+air intake

10. The Airaid intake tube is made of plastic that further insulates engine airflow from underhood heat sources. Notice the intake air-temperature probe; Airaid includes a hole that easily accommodates this critical sensor, so no drilling is necessary.

11. All necessary ventilation hoses are included with the system. Once installed, the setup appears well organized and free of friction or interference points.

12. Airaid also offers a sweet prescreen dust filter for customers who plan to travel in high-dust environments. These little mesh covers prolong filter life by up to 70 percent. We recommend these for anyone who takes backcountry travel seriously.

13. Airaid includes a sticker with the appropriate C.A.R.B. E.O. identification number so that Californians won't have problems during smog inspections.

129 0902 20 z+jeep 40l engine rebuild+throttle body installed