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The Pub For General Automotive Related Talk |
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06-08-2021, 10:45 AM | #1 | ||
DIY Tragic
Join Date: Apr 2018
Location: Sydney, more than not. I hate it.
Posts: 22,901
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A simple pondering.
If the bore size of two pumps is the same, and their applications similar (barring maybe a 10% difference in stroke), is it odds-on they will have a similar vane count? |
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07-08-2021, 07:45 AM | #2 | ||
FF.Com.Au Hardcore
Join Date: Dec 2015
Posts: 512
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The higher vane count will give a smoother delivery power steering pumps usually have a flow control valve in the output so it delivers a constant volume to your rack/ steering box the excess flow is delivered back to the reservoir the volume of the pump is matched to the requirements so what is important is the metered flow of the pump if swapping pumps is what you are looking at doing.
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07-08-2021, 06:10 PM | #3 | |||
Banned
Join Date: Nov 2016
Location: Perth Australia
Posts: 3,618
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Quote:
They were Atlas Copco compressors but no engineers to question, it was just " fit that there, machine grout, then run ya pipes " but I was always asking "why" about everything I did, do you have a reason about the benefit of vane over screw?....pumping ammonia not fluid or oil. Cheers Billy Last edited by slowsnake; 07-08-2021 at 06:11 PM. Reason: Remove misspelt |
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07-08-2021, 06:14 PM | #4 | |||
FF.Com.Au Hardcore
Join Date: Dec 2015
Posts: 512
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Quote:
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07-08-2021, 06:30 PM | #5 | ||
Banned
Join Date: Nov 2016
Location: Perth Australia
Posts: 3,618
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But I thought vane was better than screw, more efficient maybe, I asked an engineer mate 30 years later he said vane was better?...all these years later I still think about it, it interests me, and this thread sparked it off again, crazy eh, so your answer kicked it off in my head, I can read about the pros and cons but not experience?
You have an opinion on it, I know it's off track, but any input welcome, for my own curiosity Cheers Billy. |
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07-08-2021, 07:45 PM | #6 | |||
DIY Tragic
Join Date: Apr 2018
Location: Sydney, more than not. I hate it.
Posts: 22,901
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Quote:
Have been scoping a similar arrangement that has no similar issues with tension/wear on a 4 rib poly-vee driven pump with very close driven ratio and the same bore in the pump body. The only other difference I know is the stroke of the “possibility” rack is about 20-30mm more, and I wouldn’t be swapping it in. So, my take on the situation is, they redesigned it for a later model and got it more right. |
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07-08-2021, 08:31 PM | #7 | |||
FF.Com.Au Hardcore
Join Date: Jul 2005
Posts: 573
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Quote:
Vane = more efficient (lower operating cost) Screw = potential for greater volumes pumped (don't confuse pressure with volume) I'd imagine that in refrigeration Volume was important due to the PV=nRT relationship and adiabatic expansion (or something like that) As an aside Just had a new inverter RC air con installed - it runs at 100psi, replacing a 20 year old unit that required 250psi, so improvements have been made in these areas.... |
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08-08-2021, 08:23 AM | #8 | |||
FF.Com.Au Hardcore
Join Date: Dec 2015
Posts: 512
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08-08-2021, 06:06 PM | #9 | |||
FF.Com.Au Hardcore
Join Date: Jul 2005
Posts: 573
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Quote:
they are sometimes called positive displacement pumps. You'd find plenty on google search using positive displacement pump, i.e. Enerpac use to do a .manual lever screw jobbie, and they only get bigger from there. If swapping belts out, Gates have all the calcs you'll need if converting to Micro V (likely a K / PK type belt) |
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08-08-2021, 07:36 PM | #10 | |||
FF.Com.Au Hardcore
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