New 20b intake plenum and runners

vex · 01-06-2011, 10:50 PM

Just out of curiosity are you guys modeling this design off of a previously developed manifold or is this completely new?

gmonsen · 01-07-2011, 01:51 PM

Hard to say anything is "new". We have made and seen others make plenums and intakes and we sized things and designed them based somewhat on math, but there are constraints that you have to work within. The total volume of the plenum is more than double that of the stock unit and the runners taper from 2.25" Internal Diameter to 1.5" diameter over the length of the runner. Also, we have avoided any and all 90 deg angles and have smoothed the air flow as much as possible. So, we have a lot more volume and the runners should increase the velocity of air we can get through the motor, which is the whole trick to NA motors.

Gordon

01-06-2011, 10:50 PM	#1
vex RCC Loves Me Not You Join Date: Jul 2008 Location: Influx. Posts: 2,113 Rep Power: 20	Just out of curiosity are you guys modeling this design off of a previously developed manifold or is this completely new? __________________ The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group

01-07-2011, 01:51 PM	#2
gmonsen The Ancient One Join Date: Mar 2008 Location: Eastern Pennsylvania Posts: 144 Rep Power: 18	Hard to say anything is "new". We have made and seen others make plenums and intakes and we sized things and designed them based somewhat on math, but there are constraints that you have to work within. The total volume of the plenum is more than double that of the stock unit and the runners taper from 2.25" Internal Diameter to 1.5" diameter over the length of the runner. Also, we have avoided any and all 90 deg angles and have smoothed the air flow as much as possible. So, we have a lot more volume and the runners should increase the velocity of air we can get through the motor, which is the whole trick to NA motors. Gordon __________________ 1993 Rx7 R1 20b NA 1994 Rx7 20b supercharged project 1991 BMW 850 6 speed 1991 BMW E30 M3 Evo II