Minimum battery voltage required to start a 22R

[Harold]

Using a 643 battery what is the minimum voltage needed to start the motor?

Next question; when fully charged what should the voltage reading be?

[CasKru]

There is quite a few factors involved when starting the vehicle. So to say 12.2V will still start the 22R is a guestimate because there are quite a few variables.

Your earthing connections, the state of your starter, the compression on your engine, timing on the engine etc.

If you've just disconnected the charger, the voltage should be in the region of about 13.6v but will steadily drop till about 12.7v.

[Moonunit]

AFAIK it comes down to cold cranking amps, the higher the better. Also a deep cycle will swing the motor at just below 12 volts(Mine will swing my Lumina's engine which needs quite a bit of juice to turn over). I am planning on upgrading my battery in my lux fairly soon, with a Varta deep cycle battery. They are quite a bit more expensive than normal batteries, but are worth it in my opinion.

[CasKru]

Not sure if that is adviseable. The load on a deep cycle is supposed to be low for a long time where on a cranking battery you have a high load for a short time.

If you reverse these rolls you are going to damage your battery.

Typical values for deep cycle I would say would be 4 to 10 amps per hour for a few days. A cranking battery needs to deliver something like 200A for a few seconds each time you start.

[CasKru]

Also keep in mind the recharge time neccesary for the type. A high cycle (cranking battery) recharges in a few kilometers where as a deep cycle you will have to drive much further to recharge. So if you drive short distances, your battery is going to run flat eventually as it doesn't get enough time to charge (this is for a deep cycle)

[Hangover]

Not sure if that is adviseable. The load on a deep cycle is supposed to be low for a long time where on a cranking battery you have a high load for a short time.

If you reverse these rolls you are going to damage your battery.

Typical values for deep cycle I would say would be 4 to 10 amps per hour for a few days. A cranking battery needs to deliver something like 200A for a few seconds each time you start.

I agree totally... If you regularly draw more than 30A current from a deep cycle you might bend the internal plates... The deep cycle sees more than 30 amps as a fault condition...

[4x4BEES]

Interesting...........

[Moonunit]

Interesting info. Never knew this about deep cycles. Was always under the impression they are better, a lot of people I know use them for SQ grade car audio systems(Single battery).

[CasKru]

Interesting info. Never knew this about deep cycles. Was always under the impression they are better, a lot of people I know use them for SQ grade car audio systems(Single battery).

That should also be fine.... it's when it comes to the cranking part where the problem starts

[Mud Dog]

Also keep in mind the recharge time neccesary for the type. A high cycle (cranking battery) recharges in a few kilometers where as a deep cycle you will have to drive much further to recharge. So if you drive short distances, your battery is going to run flat eventually as it doesn't get enough time to charge (this is for a deep cycle)

The load on a deep cycle is supposed to be low for a long time where on a cranking battery you have a high load for a short time.

Totally agree with these comments. Deep cycle is not for cranking.