52 replies to this topic

[minimender]

Mini starters can only turn the one way - no matter the battery polarity. But if you have used a different starter - all bets are off. However - I know of NO engine that runs anticlockwise!

Gardner diesel engines can run backwards, they will rev to about 1500 rpm running backwards.

You always get one

[Cooperman]

Mini starters can only turn the one way - no matter the battery polarity. But if you have used a different starter - all bets are off. However - I know of NO engine that runs anticlockwise!

As a bit of light trivia, the 1935 AEC 'Q'Type' bus had an engine which rotated anti-clockwise. (Google it).

[minimender]

Mini starters can only turn the one way - no matter the battery polarity. But if you have used a different starter - all bets are off. However - I know of NO engine that runs anticlockwise!

As a bit of light trivia, the 1935 AEC 'Q'Type' bus had an engine which rotated anti-clockwise. (Google it).

That was to allow for the camber of the road in foreign countries

[Dan]

Loads of engines turn anti-clockwise, but also starters are not always fitted from the front of the flywheel. Not all engines are fitted to cars.

Your PRV isn't going to be doing anything with the banjo bolt and transfer pipe removed, it's unlikely it's moving at all, if anything it'll just be rattling as the oil hits it but an open system can't build enough pressure to open it. The oil is spurting because the Mini uses a pump with few lobes and the starter turns it slowly. At 60rpm a 4 into 5 pump will only produce 2 pulses per second for example. Other cars use gear pumps which effectively have far more lobes in operation and so a more constant supply. The surprising thing is it's only shooting an inch up from the port, an unregulated supply from the pump even at cranking speed should be pumping a good distance and connecting the pipe should make little difference to this. I would tend to suspect a problem with the pickup at this point.

Every now and then someone posts about an engine that simply cannot build pressure for some reason and then suddenly fires up right. I wonder if it's a case of poor quality pickup gaskets becoming air tight as they soak up oil and swell.

[liirge]

Loads of engines turn anti-clockwise, but also starters are not always fitted from the front of the flywheel. Not all engines are fitted to cars.

Your PRV isn't going to be doing anything with the banjo bolt and transfer pipe removed, it's unlikely it's moving at all, if anything it'll just be rattling as the oil hits it but an open system can't build enough pressure to open it. The oil is spurting because the Mini uses a pump with few lobes and the starter turns it slowly. At 60rpm a 4 into 5 pump will only produce 2 pulses per second for example. Other cars use gear pumps which effectively have far more lobes in operation and so a more constant supply. The surprising thing is it's only shooting an inch up from the port, an unregulated supply from the pump even at cranking speed should be pumping a good distance and connecting the pipe should make little difference to this. I would tend to suspect a problem with the pickup at this point.

Every now and then someone posts about an engine that simply cannot build pressure for some reason and then suddenly fires up right. I wonder if it's a case of poor quality pickup gaskets becoming air tight as they soak up oil and swell.

When it was cranking the right way round it was probably shooting more like 3 inches if I'm honest, I'm wondering if tightening those bolts on the back of the box may help to seal the gasket if its a pick up problem.

Im quite tempted to now build a little electrical system and install the manifold, carb, LCB and dizzy and see if I can get it to fire....

I need to get it on the floor though I can see it falling off my bench if i start it there.

[Cooperman]

Loads of engines turn anti-clockwise, but also starters are not always fitted from the front of the flywheel. Not all engines are fitted to cars.

Your PRV isn't going to be doing anything with the banjo bolt and transfer pipe removed, it's unlikely it's moving at all, if anything it'll just be rattling as the oil hits it but an open system can't build enough pressure to open it. The oil is spurting because the Mini uses a pump with few lobes and the starter turns it slowly. At 60rpm a 4 into 5 pump will only produce 2 pulses per second for example. Other cars use gear pumps which effectively have far more lobes in operation and so a more constant supply. The surprising thing is it's only shooting an inch up from the port, an unregulated supply from the pump even at cranking speed should be pumping a good distance and connecting the pipe should make little difference to this. I would tend to suspect a problem with the pickup at this point.

Every now and then someone posts about an engine that simply cannot build pressure for some reason and then suddenly fires up right. I wonder if it's a case of poor quality pickup gaskets becoming air tight as they soak up oil and swell.

I had a new-build 850 which simply would not build up pressure on the starter despite back-feeding the oil, etc. I was convinced everything was correctly built and set, so I got mad with it and started it. The pressure came up to 75 psi within about 8 seconds at around 1200 rpm so all was well. If the pressure had not come up within about 15 seconds I would have stripped it all down to find out why.

[liirge]

This shows the situation as it stands:



Yup, I tightened up the bolts on the back of the gearbox and Voila must have created a seal on the pickup gasket and I have oil pressure!
Got 50Psi on that slower turning over, but I had it upto 75Psi on a faster spin!

Does this also confirm that I have some nice tolerances between the shells and the crank,,

Thank you to everyone who contributed to this thread! Especially everyone who suspected the pick up to be at fault!

Alastair

Edited by liirge, 11 August 2011 - 09:40 AM.

[minimender]

This shows the situation as it stands:

http://www.youtube.c...h?v=V5OZ-cJ5AJc

Yup, I tightened up the bolts on the back of the gearbox and Voila must have created a seal on the pickup gasket and I have oil pressure!
Got 50Psi on that slower turning over, but I had it upto 75Psi on a faster spin!

Does this also confirm that I have some nice tolerances between the shells and the crank,,

Thank you to everyone who contributed to this thread! Especially everyone who suspected the pick up to be at fault!

Alastair

Somethin and nothin then after all.

glad you got it sorted mate.