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Thread: Holley Dual Sync Distributor Question

  1. #11
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    25,626

    Default

    Some cheaper timing lights can't read the Cranking Timing because the spark is weaker at lower cranking speeds.

    I use a digital Actron CP7529: https://actron.com/content/digital-timing-light
    Timing Light Instruction Manual: https://actron.com/sites/default/fil...lish_16313.pdf
    It's bright, works great, and it's available at most local auto parts stores.
    (Ensure the dial back-to-zero function is zeroed for fully degreed dampers.)
    http://forums.holley.com/showthread....9690#post59690 (Additional Information)
    I've successfully used this timing light on several Holley ECU controlled applications.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  2. #12

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    I figured that was the case, it's an old Craftsman. Thanks as always Danny!

  3. #13

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    Danny, I skipped this cold cranking step. Is there any reason, just starting the engine with the Idle Spark control disabled and all the timing cells at 25° and the idle tuning parameters ignition timing reading steady 25°, to then just check the crankshaft timing, would be inaccurate? And would having to advance the distributor 10° to match be outside of tolerance if the procedure of setting the distributor at 50° with the LEDs was done correctly?

  4. #14
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    25,626

    Default

    http://forums.holley.com/showthread....ing-Holley-EFI (Ignition Timing Synchronization)
    CNP/COP/DIS & single coil/distributor ignition synchronization verification & troubleshooting information at the end of post #1.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

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