arthuy said:I was a little surprised it was in a different place, especially as I didn't notice until I had the Old one off !!!
But glad to say it was a great fit on the P5. The one they sell if this doesn't is double Price.
darth sidious said:That's quite disheartening to hear (well, read anyhow!)
I seem to recall that diesel engines need to be cranked over at a higher (300+) cranking rpm to get them to fire than is needed by petrol engines. Anyone able to confirm/deny this?
LeeEFi said:darth sidious said:That's quite disheartening to hear (well, read anyhow!)
I seem to recall that diesel engines need to be cranked over at a higher (300+) cranking rpm to get them to fire than is needed by petrol engines. Anyone able to confirm/deny this?
Hello,
I believe the "spins over faster" saying is actually correct as in the gearing is reduced for more torque, so the armature spins more easily and faster, but as the gearing is reduced there is a lot more torque provided at the pinion.
[/quote][/quote]darth sidious said:I realise the armature/rotor spins faster, but what I was meaning/asking doesn't the actual rotation speed of the crankshaft in a diesel have to be higher in order for it to start than with a petrol engine? i.e. doesn't a diesel starter have to not only provide more torque in order rotate a diesel crank, but also have to get that crank rotating at a faster rate than with a petrol engine, in order to cause sufficient combustion for it to start?
darth sidious said:but also have to get that crank rotating at a faster rate than with a petrol engine, in order to cause sufficient combustion for it to start?
SydneyRoverP6B said:I'll repeat what I have been told on two occasions, one by a Rover / Land Rover / Range Rover parts specialist that has over been in business since the days of the P6. "Modern starter motors are not nearly as good as those fitted to the P6. Many from the 1980s onwards are just plane rubbish and will need replacing every few years" The second was by the Service Manager of a Range Rover business who said "Years ago starter motors would be sent away for repair, but these days it is easier and cheaper just to replace them. They don't last like they used to".
Ron.
Funnily enough I was discussing this with Pete the other day, and I realised that the starter in my 820 has so far lasted 22 years and over 200,000 miles. Not bad for a dodgy 80's starter ! In fact so has the alternator.
LeeEFi said:darth sidious said:but also have to get that crank rotating at a faster rate than with a petrol engine, in order to cause sufficient combustion for it to start?
High torque, low speed, so I wouldn't have thought so?
LeeEFi said:darth sidious said:I realise the armature/rotor spins faster, but what I was meaning/asking doesn't the actual rotation speed of the crankshaft in a diesel have to be higher in order for it to start than with a petrol engine? i.e. doesn't a diesel starter have to not only provide more torque in order rotate a diesel crank, but also have to get that crank rotating at a faster rate than with a petrol engine, in order to cause sufficient combustion for it to start?
I would think the high torque starter motor is quite important on a diesel to rotate the engine with a high compression ratio, ie; 20.0:1 Comp Ratio. Also I think a conventional starter would probably wear the pinion/ring gear more quickly, and possibly overheat trying to rotate an engine with a high compression quickly.