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Holley Carb Vacuum Secondaries - Help
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<blockquote data-quote="84Toyota4x4" data-source="post: 1368690" data-attributes="member: 16626"><p>Just as an update, I read about someone successfully using a 500 carb on a motor similar to mine using an open spacer under the carb so I thought I would give that a shot. $20 later and a 0.5" phenolic open spacer and the secondaries are working.</p><p></p><p>Its semi complicated to explain why its working if youre not familiar with rotary engine intakes, but basically the carb was bolted to an individual runner intake with no plenum area, which was causing the carb to miss out on a lot of air flow since it was only seeing air flow from half of the intake ports for both rotors.</p><p></p><p>...Or in other words, each rotor has two intake ports and with no plenum area, only two were being used until the secondaries opened - which obviously wasnt happening. Now with the spacer, all 4 are used regardless of if its the primaries or secondaries that are opened, the mixture can "mix" in the open area and be taken in to all 4 ports.</p><p></p><p>Time to start dialing it in! Thanks for the tips though everyone!</p><p></p><p>~T.J.</p></blockquote><p></p>
[QUOTE="84Toyota4x4, post: 1368690, member: 16626"] Just as an update, I read about someone successfully using a 500 carb on a motor similar to mine using an open spacer under the carb so I thought I would give that a shot. $20 later and a 0.5" phenolic open spacer and the secondaries are working. Its semi complicated to explain why its working if youre not familiar with rotary engine intakes, but basically the carb was bolted to an individual runner intake with no plenum area, which was causing the carb to miss out on a lot of air flow since it was only seeing air flow from half of the intake ports for both rotors. ...Or in other words, each rotor has two intake ports and with no plenum area, only two were being used until the secondaries opened - which obviously wasnt happening. Now with the spacer, all 4 are used regardless of if its the primaries or secondaries that are opened, the mixture can "mix" in the open area and be taken in to all 4 ports. Time to start dialing it in! Thanks for the tips though everyone! ~T.J. [/QUOTE]
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