When using HEI, the distributor requires a 12 volt feed . In order to achieve this the ballast resistor or the resistance wire must be removed from the circuit and replaced with a pure 12 gauge feed wire. ... This means that there is no power on the “RUN” circuit when the ignition switch is in the “CRANK” mode.
Where does the tach wire go on a HEI distributor?
There are two wires in the plug: the hot wire and the tachometer wire . If you are updating from an old distributor, splice the old distributor hot wire to the hot wire of the HEI primary plug. Splice the tachometer gauge wire if so equipped, into the tachometer wire on the HEI primary plug.
Does HEI distributor need ballast resistor?
When using HEI, the distributor requires a 12 volt feed . In order to achieve this the ballast resistor or the resistance wire must be removed from the circuit and replaced with a pure 12 gauge feed wire. ... This means that there is no power on the “RUN” circuit when the ignition switch is in the “CRANK” mode.
Does HEI distributor need ignition box?
The HEI distributor is still an inductive-discharge ignition , but exchanges points for an electronic device called a module. Since this system produces more voltage and amperage output than a point-type ignition, it requires a larger-diameter cap to prevent voltage crossfire inside the distributor cap.
How do you set up a HEI distributor?
Connect the primary wires to the HEI distributor, via a plug that snaps into the distributor cap . There are two wires in the plug: the hot wire and the tachometer wire. If you are updating from an old distributor, splice the old distributor hot wire to the hot wire of the HEI primary plug.
Is a HEI distributor better?
An HEI distributor is a great piece of equipment for an over-the-road car because it is completely self-contained. It requires minimal wiring and is easy to install. But without an external coil, a stock HEI cannot provide a strong spark at rpm levels commonly seen on the racetrack.
What does HEI stand for in a distributor?
High energy ignition , also known as H.E.I., is an electronic ignition system designed by the Delco-Remy Division of General Motors.
How many volts does an HEI distributor need?
An HEI should have a 10 guage wire run to it. If it’s hooked to stock wiring it may not be getting a full 12 volts. Many cars had ballast resistors or resistor wire running to the stock coil. A GM HEI should run on as low as 9 volts but 12-14.5 is required for good performance.
Can you use an MSD box with an HEI distributor?
yes you will get gains from the MSD box..........but the HEI distributor with the MSD stuff to work with the box is fine. The rev limiter is a great reason for the 6AL box.
How do you time a distributor?
- Engine knocking: Engine knocking occurs when the air-fuel mixture is ignited too soon in the cylinder. ...
- Decreased fuel economy: The timing of the spark plug is crucial during the ignition process.
How do you diagnose a HEI distributor?
- With the ignition on, connect a voltmeter (or test light) to the + post or HEI BAT terminal located on the distributor cap. ...
- Check for continuity or voltage drop in the ignition switch and in the circuit from the switch to HEI BAT terminal.
What direction does a Chevy distributor turn?
A: Chevy distributors rotate clockwise , so you’d want to turn the distributor counterclockwise to advance the timing. Advancing timing to aid in cold starting will only help if the timing was retarded to begin with.
Does HEI add horsepower?
But without an external coil, a stock HEI cannot provide a strong spark at rpm levels commonly seen on the racetrack. Engines with higher compression or more horsepower also require a hotter spark. ... By comparison, a stock HEI will have a race engine skipping and starving for power at 6,000 rpm.
Are HEI plug wires different?
The older non-HEI distributor cap has female terminals. So, there’s a big difference, and the HEI does take special wires .
What happens if ignition timing is too advanced?
Advancing the timing means the plug fires earlier in the compression stroke (farther from TDC). Advance is required because the air/fuel mixture does not burn instantly. It takes time for the flame to ignite the all the mixture. However, if the timing is advanced too far, it will cause an Engine Knock .
