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Which new (or good used) dizz should I buy?
Just can't stay away
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2011/9/24 3:28
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Folks,

I am interested in replacing the dizz in my A15. It is a early 80s electronic unit with the matchbox module on the side. I would like to continue to use an electronic dizz but type is not a problem, I will change the wiring to it as required. Also would be interested in a compatible coil. Interested in what the forum thinks would be the preferred options.

The advance cure should be adjustable or perhaps already recurved.

Engine specs:
A15 short block
H89 head port matched to a GX intake, with GX valve springs
Dual HIF4 SU carbs
Pretty much stock compression (USA market H95-style dished pistons)
Cam: Delta regrind, 262D, .425 lift at valve
5 speed trans
It's in an MG Midget (Austin Healey Sprite). 3.7 rear end, about 1600 lbs (725kg)

Posted on: 3/19 23:33
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1969 MG Midget, A15/60A
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Re: Which new (or good used) dizz should I buy?
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The best performing one is the matchbox:
* hi-amperage spark
* hi-voltage spark
* super-reliable control module (Hitachi)
* large cap for reduced crossfiring

Use the matching hi-energy coil: Nissan 22433-H7280 or equivalent. It is very similar to a Bosch HEC715 or MSD Blaster 3

I am not aware of any A-series distributors with adjustable advance curves. Any of them can be recurved the traditional way (limit the slots & change the springs)

Posted on: 3/20 0:03
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Re: Which new (or good used) dizz should I buy?
No life (a.k.a. DattoMaster)
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I've been using the same distributor on my race car; the only times I've ever had problems is when either something has come loose (screws holding advance plate loose) or the shaft was horribly worn. In this case the car would start to misfire around 7600 RPMs,.

As long as they are not worn they distributors work fine.

Tom.

Posted on: 3/20 3:55
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Re: Which new (or good used) dizz should I buy?
Just can't stay away
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OK. I guess I should just disassemble it to clean and asses the condition of the plastic parts. Then I can have the curve adjusted and get on with life. Thanks!

Posted on: 3/20 19:50
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1969 MG Midget, A15/60A
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Re: Which new (or good used) dizz should I buy?
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I upgraded to a crank fired system as i was having trouble with pinging.
I used a Nodiz unit, simple and easy to install, i used the supplied curve.
Before i couldnt rev past 4000 rpm, but now i can co all the way to 6800 where the rev limiter cuts in.

Posted on: 3/22 12:34
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Re: Which new (or good used) dizz should I buy?
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The Nodiz looks like a nifty bit of kit. What trigger wheel did you use and how did you mount it to the pulley?

Posted on: 3/23 1:17
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1969 MG Midget, A15/60A
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Re: Which new (or good used) dizz should I buy?
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If you want a kit that will rev to 6800 RPM and pull hard, try a Datsun points distributor. Any distributor that's not broken will do that

Several of us here have used a 36-1 crank trigger. The trigger wheels can be bolted to the existing Datsun crank pully (no drilling or welding needed). About $300 for Coil Pack & Wires, Controller, Trigger wheel & Trigger. No programming needed, but to get the most power out of it youll want to customize the spark curve

Posted on: 3/23 5:51
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