Coil replacement question

[SCguy]

I believe that my coil went bad on my TR6 and I would like to replace it. My car is a 73, but I believe my engine is a 71. It currently has a Lucas DLB 102 coil.

Is the Lucas DLB 102 a non-ballasted or ballasted coil?

I'm running a Pertronix ignition. What coil do you recommend?

 

[Guest]

Hi Larry, try the Lucas Sport Coil. No external ballast used, give you a little more spark and you can open up your plug gap a bit. Works well with the Pertronix.

 

[LastDeadLast]

I'm running a Mallory 29450. It's internally ballasted.

Not one fouled plug since I upgraded to the Mallory ignition a little over a year ago.

 

[Geo Hahn]

Does your coil have just a white wire feeding power to it (I think a 71/72 should)? If so then its does not require an external ballast.

If it has a couple of white/other color striped wires powering it then that would be a coil that is expecting an external ballast.

I use the Lucas Sport coil, as noted it requires no ballast. One advantage to the non-ballasted coil on the 6 is that it would be the same as your TR4. Thus one spare coil would work for both cars.

I keep my spares in cloth bags from Harbor Freight and just toss them in the boot of whichever TR I'm driving. I guess you could have 3 bags: '6', '4', 'Both'.

 

[SCguy]

So I have a white and white and red/pink(?) wire so I gues that means I need a ballast.

 

[DNK]

Larry,I have a sport coil available if you are interested.

Also have a Lucas sport coil.
here is the scoop on the Mallory if you want it

Universal Street Performance Chrome
Electronic Ignition Coil
• Universal, 12-volt coil features an oil-filled design and arc
resistant alkyd top for superior performance, insulation and
cooling. Delivers optimum performance when used with:
- Mallory UNILITE® or Magnetic Breakerless Distributors
equipped with a capacitive discharge ignition
- Mallory HYFIRE® IV and VI Series Electronic Ignition Controls
- Original equipment breakerless electronic ignition systems
• Fits most original equipment coil brackets, or use Mallory
Super Duty Coil Bracket (see below)
• Not for use with Mallory HYFIRE® Electronic Ignition Control
P/N 629, 630, 693, 29026, 29062A, 29028, 29029, 29037, or any
other high energy, inductive storage ignition system
Universal Street Performance Chrome
Electronic Ignition Coil . . . . . . . . . . . . . . . . . . . . . . 29216
Tech Sheet 29216
Primary Resistance 0.7 ohms
Secondary Resistance 8.9K ohms
Maximum Voltage 51,000 volts
Inductance 6.6 mH
Turns Ratio 99:1
Peak Current 180 mA
Spark Duration 400 uS
Spark tests were done per SAE J973 using a HYFIRE part number 685

 

[TR3driver]

A Lucas DLB102 coil requires an external ballast resistor for operation on 12v; even when used with a Pertronix.

However, your 71 should not have the ballast built into the harness as the later TR6 do, so if you stay with the DLB102, you'll need to have a resistor.

Since you're going to replace it anyway, my suggestion would be a coil that doesn't require the external ballast, like a DLB101 (which I think would be original for your car).

Note that "Lucas Sports" coils come in both varieties, so if you go that way, be careful which one you get. ISTR DLB105 doesn't need an external ballast, while DLB110 does; but I could be mistaken about the numbers.