Hello, this is Ava with Think Crucial.
The main difference between the V6 and V8 Dyson models is the mprovements in power and run time of the unit. The Dyson V6 has the V6 motor that pumps out 24 air watts in normal mode. In max mode that number goes up to 100 air watts. While the Dyson V8 comes equipped with the latest V8 digital motor that produces almost 20% more power than the V6 motor. It has the same 2-tier radial cyclones that capture fine dust and allergens. A post-motor HEPA filter keeps those allergens inside the bin. There is also the Bin improvement as Dyson was able to increase the capacity to 0.14 gallons for Dyson V8. This is around 0.03 gallons bigger than the V6.
You can purchase a wide variety of high quality Dyson replacement parts for your Dyson vacuum direct from Think Crucial with free shipping and an exclusive 10% coupon for Fixya.com readers, use code: FIXYA10
I hope this was helpful.
Think Crucial Customer Care