I'm putting together a small cuircuit to delay ignition on after I push the starter so the engine is spinning nicely before the electonic distributor fires off a spark.

Anyone like to guess at how long the starter should run before the engine can fire?

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David L


My greatest fear in life is that when I die my wife will sell my Mini and tools for the price I told her I paid for them!

Subaru WRXs have a deliberate delay of about 1 - 1.5 seconds before they allow a spark to be generated....I dunno why in their case, but am told it is so....

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Assuming your fuel system is performing properly, I wouldn't have thought you'd need more than a couple of crank revs. My 123 kicks off the starter on the first or second power stroke, it's a damn pain in the ass.. almost never get it started first go without dampening the spark with the choke.

Couple of revs would be enough I think... enough to get some momentum up.

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Simon

The adventures of an owner builder in the Tallarook Ranges

One and half seconds...geeze Nora - a properly tuned Mini should fire immediately the key is turned.

Cheers, Ian

would love to see a how to on this delay circuit. good luck

It really only needs to skip firing one plug, so half a second could do it.

why David

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Stop Licking the Dog...I Don't Care Who Started It

I was looking at something like this and modifing as necessary.

http://www.jaycar.com.au/productView.as ... &SUBCATID=

With a standard points ignition when you turn it over to start the motor it misses the first spark while the ignition builds up current and then it fires the second cylinder.
With an electronic ignition like a Pulsar dizzy it will fire the first cylinder regardless.
This means that if you are running a bit of advance on the ignition and your starter is a bit slow it will kick back when the first cylinder sparks because the crank is not spinning fast enough.

By fitting a delay the crank will spin fully before the ignition fires the first spark.

With the Pulsar dizzy, I now have a switch wired into the ignition circuit, I spin the starter up for a few turns then throw da switch..
Before I did this mod, I broke 3 Lucas starter pinions, including 2 new ones...
This 1360 runs about 16° static advance.... and needs it.

The wife's 1293A+ also with Pulsar dizzy has a Gemini starter, it doesn't break pinions but it stalls the first rev or two when cold.
BTW the Gemini starter KW rating is less than the Lucas... but they do spin better. Probably less friction...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thats the problem I'm having.Fine when warm but cold it does have problems sometimes.
I'm not particularly keen on a switch as my wife has taken to driving it and I have to keep things as simple as possible.This is a woman who refused to drive it initially as the speedo was in mph.

With the Gemini starter, just turn the key until the motor is running- being a pre-engaged type it can't throw the pinion out with isolated kicks like the Lucas always does.

As for the speedo problem, put a 140KMH Moke one in.
The one marked 800turns/km suits a 3.44 diff pretty well, the 860 turns/km one suits a 3.647 (Mini-K) diff and is spot on. Both these assuming with 10" wheels...

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I thought mini K was a 3.44 diff and deluxe was 3.647?

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Mini-K is 3.647, (I run 2 of em) Deluxe was 3.765.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Nope. Only Cooper S/LS/GT were 3.44 to compliment the 1275.

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.