[johnsiddle]

Hi Guys.
I guess this is the start of a very long project, I have been sorting things for my build and will start to post the pictures in the next submission.
But I have a quick question, is there any reason why the vacuum pump can not be belt driven off the main motor. I have already sorted a Vacuum buffer tank (old fire extinguisher) and searching around for electric pumps seems a fruitless and expensive exercise.
John

[Woodsmith]

Not really a problem in doing that. It was how I was going to drive the AC compressor to raise a vacuum for the MR2 project.

I found the AC compressor could get max vacuum, 11"hg, in about 5 seconds, about the time I would take to drive to the end of my drive in 1st gear.

I guess your problem would be in switching the vacuum pump on and off but as a mechanical pump fitted to an ICE is always running that might not be a problem. Some do need an oil pressure supply though, from the ICE oil pump. The ac compressor had an electric clutch pulley

I suppose you could put the pump on a motor and power it up to see how long it takes for the vacuum tank to be evacuated and how many inches of mercury it can draw. It is worth getting a vacuum gauge from Ebay to monitor it.

[Woodsmith]

This is the bench test of the system.


Then out on the car.


The set up of the vacuum system.

[jackbauer]

I'm running one of these :
http://www.ebay.co.uk/itm/AUDI-TT-EL...item1c20f930f5

works great.

[johnsiddle]

Originally Posted by Woodsmith

Not really a problem in doing that. It was how I was going to drive the AC compressor to raise a vacuum for the MR2 project.

I found the AC compressor could get max vacuum, 11"hg, in about 5 seconds, about the time I would take to drive to the end of my drive in 1st gear.

I guess your problem would be in switching the vacuum pump on and off but as a mechanical pump fitted to an ICE is always running that might not be a problem. Some do need an oil pressure supply though, from the ICE oil pump. The ac compressor had an electric clutch pulley

I suppose you could put the pump on a motor and power it up to see how long it takes for the vacuum tank to be evacuated and how many inches of mercury it can draw. It is worth getting a vacuum gauge from Ebay to monitor it.

Thanks Woody, I will get the original pump back from the farm tomorrow and see how it connects. Seeing as it is original it should run ok there was only two connector pipes and these are still on the car.
Wont an AC pump seize eventually as there is no lubrication once the refrigerant is removed?.

Just waiting for the paint to dry on my cradle then its all systems go.
John

[johnsiddle]

Originally Posted by jackbauer

I'm running one of these :
http://www.ebay.co.uk/itm/AUDI-TT-EL...item1c20f930f5

works great.

Thanks for that Jack, being a tight a?e I dont really want to pay £100 for one, although at least I now know which car uses them. Will go to the breakers tomorrow and have a root.
John

[Woodsmith]

Originally Posted by johnsiddle

Wont an AC pump seize eventually as there is no lubrication once the refrigerant is removed?.

Just waiting for the paint to dry on my cradle then its all systems go.
John

Ummm, someone either here or elsewhere suggested a particular lube that the compressor could be soaked in that would then lube it for a long time. Some Land Rover people have used them as a pressure pump for on board air supplies. That's where I got the idea from.

I hope the cradle is square and accurate.

[johnsiddle]

Originally Posted by Woodsmith

Ummm, someone either here or elsewhere suggested a particular lube that the compressor could be soaked in that would then lube it for a long time. Some Land Rover people have used them as a pressure pump for on board air supplies. That's where I got the idea from.

I hope the cradle is square and accurate.

I have seen some Surf owners use the AC as an onboard compressor but no mention of the life. But an occasional compressor is different to continuous running albeit being controlled by a pressure switch.
They tend to be a bit heavy as well

There was no vacuum tank on the car but I suppose that is taken care of by the fact that the ICE is always running. I should be able to get a flat belt around my coupling.
I think I have an old Vacuum gauge down the farm.

The cradle should be OK I need to buy a piece of 8 or 10mm steel plate for the motor to sit on. I am waiting for a 17.5mm drill to come so I can re-drill the mounting holes to tap 20mm the 16mm fine thread holes were rubbish.
I have drilled 16mm as an interim using my drill press, which has cleaned that hole that went off a little. The next drilling should clear it. 20mm bolts wont fall out anyway.
The cradle is in 50mm box, so what were you saying about over engineered??
john

[Woodsmith]

Originally Posted by johnsiddle

The cradle should be OK I need to buy a piece of 8 or 10mm steel plate for the motor to sit on. I am waiting for a 17.5mm drill to come so I can re-drill the mounting holes to tap 20mm the 16mm fine thread holes were rubbish.
I have drilled 16mm as an interim using my drill press, which has cleaned that hole that went off a little. The next drilling should clear it. 20mm bolts wont fall out anyway.
The cradle is in 50mm box, so what were you saying about over engineered??
john

I think you should start saving for lithium.

Do check and double check everything is square and true to the face of the bell housing and gearbox primary shaft. That will keep shimming and adjustment to a minimum.

I am still not happy with the coupler though I am sure that we can do better with that. Have you still got the rest of the clutch plate?

[mora]

How about using original Volvo V40 electric vacuum pump?

http://www.ebay.com/itm/2000-2004-vo...738929&vxp=mtr

Mine came from V70 and was 50eur. Works great.