I'm getting the stuff together to make a manifold spacer for the little 2.7 workhorse, and this is the finished project...
This manifold will be used as the model for reproducing the details...
The spacer will be machined with the proper grooves to accept a stock Toyota O ring intake manifold-to-head gasket exactly like the one already on this manifold. This will make for a nice secure reliable air tight fit exactly as good as the manifold. In fact it will be better than the manifold as the two facing surfaces will both be machined aluminum.
The 2.7 enjoys the distinct advantage of having plenty of side clearance so the spacer will be a full 1 inch thick. I'll be making just one prototype for dyno testing. That's why I did these recent baseline runs. So there will be an accurate comparison when I do the runs with the spacer.
The manifold runners that curl around from the orange gasket to the white line where they enter the plenum are 17 inches long.
So a one inch spacer will make them 6% longer which should slightly lower the torque curve. How much isn't yet known. The dyno results will tell the tale. This is why I made damn sure to have a torque curve that starts before 1,500rpm.
I already have some experience making and selling manifold flanges, adaptors, "build your own" manifold kits, as well as complete manifolds...
This is a purely experimental one I'm working on right now...
The experimental plenum is completely devoid of any flat reflective surfaces to reflect the pulses coming out of the mouths of the runners.
The runners are in direct alignment with the throttle body bore.
It's going to be fun to see how this experimental project goes.
Only if the tooter 2.7 intake manifold spacer turns in some decent dyno gains will they be manufactured and offered for sale to anyone who's interested in buying them. If not, the prototype will just be an expensive paperweight!
And no preorders... Only when they are actually in stock and ready to ship will they be offered for sale. Jerking people around is not my style.
I'll keep everyone posted on the progress in this thread. I just talked with CNC guy about the job today, and he's going to have his machine down for required maintenance for a few weeks, but this project is first in line when it's back in action.