[Mgs] Slow cranking, was Siphoning Gas

[PaulHunt73]

Yes it is a good value, but you need to measure the voltage at the starter battery cable terminal and body as well.

The starter is a bit chicken and egg.  As less voltage reaches the starter from, say, poor connections the battery voltage will go up even though the cranking speed goes down, because the starter voltage has gone down.  

If the circuit though the starter - which includes the solenoid on a pre-engaged is poor then voltage at the battery and the starter terminals will be good even though cranking speed is low.

If there is excessive mechanical load on the starter causing the slow cranking, then both battery and starter voltage will be lower even with a good battery.

And of course if the battery is weak then the voltage measured right on the battery posts will be low.

Geared starters are very good seemingly achieving the impossible of reducing battery drain whilst increasing cranking speeds and making starter easier, but are expensive.

A better bet is a modern non-geared starter which goes some way to achieving the benefits of a geared at a lighter weight and about half the price of an original.  Moss Europe for example have the geared at £223, the light-weight at £88, and the OE at £130 plus £15 returnable surcharge on a rebuildable unit.  The term 'hi-torque' can be confusing, some suppliers apply that to the geared and some to the lightweight.  The difference between the two is that in the geared the solenoid with its connections is in line with the output pinion and the motor is on the side, instead of being the other way round.  Also the solenoid and the motor are very nearly the same sizes, again unlike the others.  A drawback with the geared, and maybe the light-weight, is that they don't have the rubber bumper coil boost contact which aids starting.  The geared may well not need it, and it can be replicated with an additional relay, or more easily with a split-charge relay with two output connections, or a diode if you know what you are doing.

PaulH.

----- Original Message ----- 


   

  I measured the voltage on the posts while cranking = 10,5 volts. It is on a digital meter, so I wonder if that’s a good value.

  The same value is measured on the starter ingoing post.

  So no tension loss on the electrical circuits.


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