Muscle Mustangs & Fast FordsHow To Engine
Three-Valve Intake Manifold Dyno Test - Three's A Crowd
Three intake manifolds for Three-Valve Mustangs
JPC Racing PN 3V Cast Intake
JPC Racing has made a name for itself on dragstrips across America. Justin Burcham, owner of JPC Racing, has put together some radical combination, pushing the limits of Mustang performance, especially in the modular segment.
"We designed the intake back in 2005 to fill a void in the market,” explains Burcham. "We wanted a big open plenum with shorter runners. It made good power through all of our testing, so we put it into production.”
In the early days, JPC constructed its manifolds from sheetmetal. The end result was an intake that made good power and extended the usable rpm range, but wasn't budget oriented. To combat the cost of machining, JPC went to work altering the manufacturing process, and now its intake is available in cast aluminum.
"The design change was based around price,” says Burcham. The sheetmetal intake works well, but it's expensive to build and takes a long time to assemble. The cast intake's design hasn't changed much from the original, but there are some cosmetic updates. A lot of the corners and edges are more round. The throttle body plate is billet and allows you to run a larger throttle body by simply switching the mount. We've also added a provision for an IAT sensor in the plenum. This is designed for centrifugal supercharged and turbocharged cars with the sensor in the MAF before the blower or turbo.”
Installing the intake was easy. The JPC piece was the only one in the test not using the O-ring-style gaskets. Paper gaskets are supplied with the intake and go between the intake and the cylinder heads. Once the installation was buttoned up, we were ready to move the rollers.
The cast version of the JPC intake laid down 381 rwhp and 316 lb-ft of torque for a peak gain of 14 hp and 9 lb-ft. The JPC intake's graph is slightly peakier than the graph with the stock intake. The JPC intake makes more power in the higher rpm range, but shows gains and losses in the low to mid-rpm range. At one point, the JPC is down by as much as 7 hp and 8 lb-ft, but a few hundred rpm later, it's up by 17 hp and 18 lb-ft.
The JPC Racing intake manifold was designed for high-rpm operation. It doesn't give up a lot of power and torque, but for optimal results it should be used with a combination that will see 6,500-plus rpm.
|Runner Length||8.12 inches|
|Intake Volume||8.30 liters|
|Max Throttle Body Size||Whipple mono-blade (GT500)|