[Kevin wilding]

Would a 1 ½ inch hose generate more suction than a 2 inch hose?

Or am I just thinking silly thoughts? 🤷‍♂️😂

[john martin]

no , not really , as in if you put a lift guage on both setups ... it will read the same  , the time to reach max lift mught vary a fraction between both but negligable over typical runs .
2" is said to preserve airflow better over long hose runs .

I see you other post ( in some obsure place )   
http://www.cleanitup.co.uk/smf/index.php?topic=216874.msg1972708#msg1972708

how can you get more performance from your powerflite  ,  are your motors 2011 ?   if so just new vacs should give a bit more performance as id say the ones you have are tired  ,  there are different wattage 5.7 vacs  ....   two of these 1400w should work
https://www.worldwidecleaningsupport.com/lamb-electric-240v-ac-3-stage-1400w-tangential-117123-29

There is also a 1600w + a 1200w combo often used by ashbys that would work .  You can get those vacs from many suppliers , alltec , restormate others

[Kevin wilding]

Thanks for the replys to both....appreciated

Not sure why my other post ended up there lol

Thanks

[john martin]

There is a reference here  to that motor  model number in your pic .

https://shop.monsterjanitorial.com/powr-flite-1989-a-motor-2-stg-230v-061000049-01-replaced-1989-ie/

If thats what they are , two stages ,ancient weak things  , you would see a good improvement switching to the vacs i linked to .