New Item Rarely Seen on Ebay, NOS Limited Slip Differential Transmission Flanges Options

[914Sixer]

Lot thicker and longer shaft.

[live free & drive]

For Technical Ninja regarding dimpling in manifolds etc. Paper linked at bottom:

4. Conclusions

In this work application of dimples in the intake manifold were analyzed (see Table 5).

Both partially and full dimpled surfaces were created, analyzed, and compared to intake manifold without dimples with the same dimensions and boundary conditions. It was found that a significant rise in area-weighted average turbulent kinetic energy due to dimples, which may occur due to reattachment phenomena. An increase of 25.45% and 35.41% for partial and full dimpled surfaces were reported. Also, the effects of velocity with turbulent kinetic energy were seen, in which increase of velocity results in the increase of slope as shown in figure i.e. rate of increase in “k” is more at higher velocity. The most important thing other than analysis was to carry out the mesh independency test, which results can be seen in Table 6.

This design in work gives a new arrangement in the intake manifold to provide more turbulent air at the outlet, which is inlet air to the combustion chamber and the diesel engine is the best area to incorporate this arrangement, it will increase the mixing of diesel and air in combustion. This arrangement can increase fuel economy and further control emissions in a diesel engine. Still, more changes can be done to further enhance the turbulence of air at the outlet like using airfoils and combine airfoils-dimpled surfaces in the intake manifold (see Table 7).

https://www.sciencedirect.com/science/artic...214157X21004627

I have a Porsche 3.2 injection manifold that was band-sawed apart and flow balanced and they used selective portions of dimpling to balance the flow (and a limited amount of general smoothing) - these areas were generally opposite of the 90 deg take-offs from the off the main plenum. This actually adds area under, and flattens the torque curve - it does not add lot of horsepower; per se. Extrude hone generally ruins or adds little to these manifolds as it widens the spots that need to be narrow to speed up the flow.