Take Another Deep Breath…
November 14, 2006







Detroit, MI -- When we last left you, fabrication virtuoso John Marcella had just begun building the intake manifold for the new ET Performance prepped 11 degree Big Chief induction package that'll top our high-revving 465 cubic inch nitrous-injected racing engine.

After both banks of runners are welded to their intake faces, John removes them from the mock up heads. This is so he can easily locate and weld the internally threaded nitrous injector bosses that will be located on the runner floor in the valley. One of the more convenient aspects of utilizing electronic fuel injection is 'dry' nitrous injection. This allows for a much smaller nitrous nozzle because no fuel is added to the nitrous at the point of injection, all gasoline is introduced via the electronic fuel injector only. Essentially, the nitrous delivery system is cut in half by eliminating fuel solenoids & hard lines, making for a neater and more compact nitrous system. We'll get into more details of Jeff Prock's Applied Nitrous Technology multi-stage nitrous-oxide system later.

After all eight of the floor bosses are welded in place, John prepares to fabricate the plenum by trimming the runners to the appropriate length and angle as dictated by his drawing. It's not nearly as tricky as you'd think. John simply bolts each bank of runners to a milling machine table, adjusts the cutting head to the correct angle, and the table to the required height. At that point, all that's left to do is twist the machine handles until each runner is cut back.

While the mill is still warm, John also machines the rail that's used at the top of the plenum to fasten the roof plate that hold our trick new Applied Nitrous Technology throttle bodies.

It's then back to the sheet metal brake one last time for the four quick bends that define the basic shape of the plenum box. While he's at it, John also sizes and shapes the front & rear walls of the plenum. With that, he now has all the pieces needed to weld the plenum together and on to the two intake runner banks.

In our next chapter, we'll show the results the plenum installation. So don't be gone long! We'll have it uploaded in just a few days.

Thanks for the visit!

Ted & Tim Pelech
Pelech Bros. Racing


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