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Thread: Street Avenger 570

  1. #1

    Default Street Avenger 570

    Can anyone tell me if the 570 I have should be generating vacuum for the distributor advance when only idling?I've had to restrict the vacuum hose with a zip tie to stop it. Is this normal or faulty? I wondered if it was a feature of an automatic transmission carburetor? Perhaps I need to get a different carb or can it be changed? Any advice appreciated. Thanks in advance.

  2. #2
    Join Date
    Dec 2009
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    Carburetors have two distributor vacuum advance ports: Ported (timed) & full manifold vacuum.

    Vacuum advance should be connected to full manifold vacuum; not ported.
    8°-12° of vacuum advance is the typical limit (some canisters are adjustable).
    The (ported) timed spark port is only for emissions/EGR engines (LINK).
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  3. #3

    Default

    Thank you Danny, I would never have thought that based on the carburetor instruction manual. Should I simply block off the Timed Spark source and run a T-fitting from the Full Manifold for the vacuum gauge and the distributor vacuum advance system? My engine tuner seem to think running the PCV from the Power Brake port made it run better, than using the PCV port. Although I don't understand how it's different. Thanks.

  4. #4
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    Quote Originally Posted by pumper View Post
    Should I simply block off the Timed Spark source and run a T-fitting from the Full Manifold for the vacuum gauge and the distributor vacuum advance system?
    Yes, that's common.

    My engine tuner seem to think running the PCV from the Power Brake port made it run better, than using the PCV port.
    Find another engine tuner. The power brake vacuum booster should not share the same hose with the PCV valve.

    Although I don't understand how it's different.
    Both of these components use full manifold vacuum.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

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