The 75 and ZT Owners Club Forums

The 75 and ZT Owners Club Forums (https://www.the75andztclub.co.uk/forum/index.php)
-   Technical Help Forum (https://www.the75andztclub.co.uk/forum/forumdisplay.php?f=11)
-   -   Have I a duff battery (https://www.the75andztclub.co.uk/forum/showthread.php?t=315756)

polinsteve 26th November 2021 12:31

Quote:

Originally Posted by macafee2 (Post 2907441)
I can try that. What fuse to remove, fuel pump?
15 seconds continuous cranking seems a long time, I just timed it my goodness that is a lot of cranking

macafee2

Back in the day, (late 1960s buses) our Leyland Leopards would take several minutes continuous cranking in cold weather, followed by a clouds of acrid smoke.

COLVERT 26th November 2021 22:22

Quote:

Originally Posted by polinsteve (Post 2909689)
Back in the day, (late 1960s buses) our Leyland Leopards would take several minutes continuous cranking in cold weather, followed by a clouds of acrid smoke.

I guess you could call that proof of rubbish design.---:D

Fast tick over to put a charge into a nearly flat battery is no better than just letting the engine tick over.--The modern alternators will hold 14.4 volts even at tick over.---:cool:

Ducati750cc 27th November 2021 01:31

Quote:

Originally Posted by COLVERT (Post 2909798)
I guess you could call that proof of rubbish design.---:D

Fast tick over to put a charge into a nearly flat battery is no better than just letting the engine tick over.--The modern alternators will hold 14.4 volts even at tick over.---:cool:




Rubbish design from the 1960's compared to what exactly ? :shrug:



Fast tickover compared to idle tickover to put a charge into a nearly flat battery is the same you say.


Can I suggest you experiment on your suggestions with a modern alternator with both a voltmeter and an ammeter connected.


Then come back to report that the amps produced is exactly the same at both idle and a high idle.


Volts is only half of the story :shrug:

MSS 27th November 2021 09:38

Quote:

Originally Posted by COLVERT (Post 2909798)
I guess you could call that proof of rubbish design.---:D

Fast tick over to put a charge into a nearly flat battery is no better than just letting the engine tick over.--The modern alternators will hold 14.4 volts even at tick over.---:cool:


Up to the late 1970's most vehicles did not charge the battery well at idle. Motorcycles did not at all. When Honda launched the CX500 V-twin in 1978, they made a huge thing of the fact that its alternator charged the battery even at idle.

COLVERT 27th November 2021 11:28

Quote:

Originally Posted by MSS (Post 2909846)
Up to the late 1970's most vehicles did not charge the battery well at idle. Motorcycles did not at all. When Honda launched the CX500 V-twin in 1978, they made a huge thing of the fact that its alternator charged the battery even at idle.

I changed the dynamo on my 1970's Fiat 500 for an alternator with dramatic improvement.--It made a real improvement of the headlights from 10 glow worms to 100 glow worms.---The light actually managed to reach the road surface---:D

COLVERT 27th November 2021 11:33

1 Attachment(s)
Worth looking at.---:D-----Live and learn is my motto.-----;)






COLVERT 29th November 2021 23:48

I guess the above pdf was too complicated for most folk.---:shrug:

macafee2 30th November 2021 18:11

Quote:

Originally Posted by COLVERT (Post 2910291)
I guess the above pdf was too complicated for most folk.---:shrug:

I dont do well reading a lot of material like that. I'm not good at technical reading, I just cant take all the information in.

macafee2

Ducati750cc 30th November 2021 20:47

Quote:

Originally Posted by COLVERT (Post 2910291)
I guess the above pdf was too complicated for most folk.---:shrug:


A bit technical in parts but otherwise not bad.


Remember when you said......... " Fast tick over to put a charge into a nearly flat battery is no better than just letting the engine tick over.--The modern alternators will hold 14.4 volts even at tick over.-- "


And I said .........."Fast tickover compared to idle tickover to put a charge into a nearly flat battery is the same you say.

Can I suggest you experiment on your suggestions with a modern alternator with both a voltmeter and an ammeter connected.

Then come back to report that the amps produced is exactly the same at both idle and a high idle. "



Could I suggest you read the PDF, taking note of Fig. 3 and Fig. 7 where you will find that there is a noticeable increase in current output at higher idle ( fast ) speeds







MSS 30th November 2021 21:52

Quote:

Originally Posted by COLVERT (Post 2909867)
Worth looking at.---:D-----Live and learn is my motto.-----;)



Did you hope to initiate a discussion on the basis of the paper? If so, to what end?


All times are GMT +1. The time now is 17:33.

Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Copyright 2006-2022, The Rover 75 & MG ZT Owners Club Ltd