Quote:
Originally Posted by Nux
Has any of you guys ever made your own filters for the individual stacks - Singer style? It's a shame to hide those shiny trumpets away:
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Making a suitable filter for velocity stacks can be difficult. For the velocity stack to be most effective it needs clean air above and around the lip out to a certain distance (usually 1 1/2”). Dry foam filter socks disturb that area. K&N filters can be adapted but you need a way to mount them which can be problematic if you have non standardized cylinder spacing and/or velocity stacks. Then you can even go as far as intake runner length designed for intake valve harmonics. I calculated the 3.0 Flat six needs approximately 22inches per runner to be effective in this regards. That is from the back face of the intake valve to the lip of the velocity stack. The shorter the runner, the higher the point where useful torque is felt in the rev range.
Lots of black magic and pseudo-mathematics involved. : )
-Steve