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Jen
The machining is beautiful. How did you make the bellmouth's? The power gain that you're getting is from effectively increasing the tp area by a factor of 6 if your using the same size tp as stock. Even doubling the tp area from stock should give you a good gain. The length of the tubes should be increased if you want max power for two reasons. First with such short tubes the resonances (that induce extra air into the cylinder as the intake valve starts to open) will probably start at too high an RPM. Secondly, and probably more importantly, the VE is the highest when you have a longer column of air. When the intake valve opens the air in the column (tube) starts to accelerate and fill the cylinder. Somewhere in the middle of the stroke the column air reaches maximum velocity. Near the end of the stroke the piston is slowing down to a crawl while the air column has momentum which keeps filling the cylinder, thus raising the charge pressure (and mass) in the cylinder. A short air column has less momentum and will fill the cylinder less. If your going to run at the stock RPM range then the tubes should be about as long as the stock intake manifold (runners). Since your putting so much effort in (and doing such beautiful work) I suggest that you start
with a better theoretical underpinning (i.e. longer tubes). Good luck on whatever you do.
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84 mt 6mge with intake, exhaust, suspension, brake, and wheel mods
85 mt 6mge stock
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