4.6 into a 4.0 TVR Griffith

[spend]

In blending bases you can significantly improve the transition into the bends in the inlet manifold. It's not just a case of rounding out the top of the trumpet base & discarding the pipes ~ all the better versions are worked down into the inlet manifold & show significant gains. You have to be a bit careful interpreting some of the 'blended base' discussions, eg Elliots plastic insert design did nothing down into the manifold but just rounded the entry on top of the std base, not all of them are the same even though they use the same title IYSWIM.

[POAH]

cheers - I don't really know much about the inlet of the RV8

The trumpets have been removed and the base blended.

why remove the trumpets?

There is a train of thought that removing the trumpets moves the power up the rev range with some high end gains. Others believe it would be at a detrimental loss to lower down torque but my power plot is excellent IMO.

The engine came this way when i bought it and it works very well.