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MG Midget and Sprite Technical - cold cranking current
'evening, Chaps....1275 midget...anyone know what the CCC is for a bog-standard car? Thinking about temperatures about 6 degrees C or thereabouts... Many thanks.. Dave |
David Cox |
This is from a Lucas manual that I downloaded last week.
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Dave O'Neill 2 |
Here's the rest of the page. I will see if I can find a link to the download, which I think was possibly on the TD/TF board. ![]() |
Dave O'Neill 2 |
Here�s the link http://www.dbraun99.com/Technical%20Index/Lucas%20technical%20correspondence%20course%20SEARCHABLE%20binder.pdf You will have to copy and paste it. |
Dave O'Neill 2 |
From a later Lucas booklet -
Note: During the voltmeter checks the starter should crank the engine without starting it. Petrol engines The low-tension circuit of the ignition coil should be disconnected between the coil and distributor. A voltmeter connected between the positive and negative battery terminals. The reading is noted when the starter switch is operated. The readings for a 12 volt system depends on the engine capacity, battery size (Ah) and type of starter. A typical figure for petrol engines is about 10.0 volts. Further tests in the Lucas Fault Diagnosis Service Manual pdf - http://www.gomog.com/allmorgan/LucasFault.pdf |
Nigel Atkins |
If I were a betting man (which I'm not) I'd guess the CCA for an A series engine wouldn't exceed 200A in cooler conditions and on a warmish day 100A might be nearer the mark. There'll be an initial surge in current as the starter gets the engine turning but that will then drop back somewhat. |
Bill Bretherton |
You'd have to be close Bill I was told when in my yoof to expect around 100A per litre engine size while cranking, naturally there will be a larger draw/surge initially |
William Revit |
many thanks for input....this community is indeed the Fount of all Knowledge.. Dave |
David Cox |
Coincidentally in the last couple of days I decided to check the cranking current of my B, using my late fathers AVO model 12 and 900A shunt. This is the first time I�ve used this since he died 20 years ago. After an initial flick of the needle it settled down to 150A, the temp wasn�t that low, I would guess about 17 degrees C |
R.A Davis |
This thread was discussed between 12/02/2020 and 13/02/2020
MG Midget and Sprite Technical index
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