Intake manifold
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| − | ===Single plane=== | + | As far as cutting the RPM like the AG, because the carb height and runners are basically the same between the two intakes, that mod will make their top end output equal for all intents and purposes. Not saying that's the thing to do in every case- just saying that [I]if[/I] the same powerband as the AG is wanted, it can be had by notching the divider. For the right engine and vehicle combo (low gears, higher stall speed, light weight, more track than street, etc.) notching the plenum (or adding an open spacer) can help more than it hurts. |
| − | A single plane intake will | + | |
| + | ===Single plane vacuum loss=== | ||
| + | A single plane intake will have about 4 in/Hg less vacuum than a dual plane due to the design, all else being equal. Obviously this is not written in stone; other factors like carb size and cam specs will have a large effect on the amount of vacuum the engine has. | ||
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[[File:CARB SPACERS WOOD Q-JET single.jpg|thumb|300px|left|Spacer made specifically to fit the Pontiac Performer intake. Spacer is upside down.]] | [[File:CARB SPACERS WOOD Q-JET single.jpg|thumb|300px|left|Spacer made specifically to fit the Pontiac Performer intake. Spacer is upside down.]] | ||
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| + | ===Notched plenum divider vs. spacer vs. single plane=== | ||
| + | The 1" x 3" notched plenum divider of the RPM AG falls in between an intact plenum divider of a dual plane and an open spacer on a dual plane. It allows ''some'' of the benefits of a single plane, but w/o all of the downsides. It has been observed that using an Edelbrock C3B- with its cut out for the secondary throttle blade of the Holley 3 barrel extended out to a little over 3.5"- it performs right in between an open spacer and no spacer or "notched" divider of a dual plane. This also seems to be the trend w/the Edelbrock RPM vs. RPM Air Gap. | ||
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| + | An open spacer on a dual plane will increase plenum volume- something that a notched plenum doesn't do, and this is part of the reason why an open spacer/dual plane often falls in between an open plenum and a standard dual plane without an open spacer in performance. Also there's no added carb height when using a notched plenum divider like there is using a spacer. The added height of the spacer can help allow the air/fuel to make the turn into the runners with less deflection of the A/F stream when it hits the plenum floor at high rpm. | ||
===Also see:=== | ===Also see:=== | ||
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