MSD Engine Variable Timing Adjuster

MSD Engine Variable Timing Adjusters: Take Command of Your Ignition Curve

When it comes to maximizing engine performance, ignition timing is one of the most critical variables in the equation. Too little advance and you leave power on the table; too much and you risk damaging detonation. MSD has long been a cornerstone of the performance ignition world, and their lineup of Engine Variable Timing Adjusters gives drivers and tuners a practical, proven way to fine-tune timing on the fly — whether you're navigating changing altitudes on a cross-country run or dialing in a pass at the drag strip.

What Makes MSD Timing Adjusters Stand Out

MSD approaches timing adjustment with an emphasis on driver accessibility and real-world flexibility. MSD Timing Controls are designed so engines with locked-out timing or crank triggers can take advantage of a full ignition curve — the mechanical advance is locked out so timing is controlled entirely electronically, allowing timing curves to be set faster, more accurately, and with more adjustability than mechanical advances.

A key product in this lineup is the MSD Adjustable Timing Control (PN 8680). This unit puts you in control of your ignition timing from the driver's seat, with a dash-mounted control knob that lets you adjust timing to compensate for changes in altitude, low-octane fuel, or heavy loads. The control knob mounts to the dashboard for easy and accurate timing adjustments up to 15°, and the unit is compatible with 4-, 6-, and 8-cylinder engines when used with an MSD Ignition Control. The 8680 is also legal for sale and use on emissions-controlled vehicles in all 50 states, carrying a California Air Resources Board (CARB) Executive Order number.

Boost Timing Control for Forced-Induction Engines

For turbocharged and supercharged applications, MSD offers specialized solutions that link timing retard directly to boost pressure. The MSD 6BTM Series is purpose-built for these setups. Not only does the engine benefit from MSD's full-power CD sparks, but there is also an adjustable boost/timing retard circuit to prevent detonation. The 6BTM lets you dial away detonation by retarding the timing in relation to boost pressure, with a dash-mounted control knob adjustable from 0° to 3° of retard per pound of boost — up to a maximum of 15°. The 6BTM also features MSD's Soft Touch Rev Control for over-rev protection and is supplied with rubber shock mounts and RPM modules for 3,000, 6,000, 7,000, and 8,000 RPM.

Similarly, the MSD Boost Timing Master (PN 8762) targets roots blower and supercharger users. This unit allows you to adjust the amount of ignition retard from 1° per pound of boost to 3° per pound via a dashboard-mounted control knob. A notable feature is the ability to set a specific boost pressure point at which the retard begins — giving tuners an extra layer of precision over detonation protection.

Who Benefits from MSD Variable Timing Adjusters?

MSD's timing adjuster lineup serves a broad audience. For cars driven daily but raced occasionally on weekends, these controls are ideal — improved fuel mileage and performance are direct benefits, as the ignition timing can be advanced or retarded to prevent engine detonation. At the same time, racers running locked-out distributors, crank triggers, or high-boost forced-induction setups will find the boost-integrated units indispensable for protecting their engines under wide-open-throttle conditions.

Whether you're building a weekend warrior or a dedicated track car, explore the full range of MSD performance ignition products or browse all Engine Variable Timing Adjusters to find the right solution for your application.