Harddrive Hi-Volume/Pressure Oil Pump - Milwaukee-Eight
About Harddrive
Harddrive is the house performance and replacement line built for American V-twins, covering everything from engine hardware and electrical to controls, lighting and chassis parts. The range is aimed squarely at Harley-Davidson and Indian riders who want a direct-fit part without dealer pricing, and it spans decades of model years — from Evolution-era Softails to current Milwaukee-Eight baggers.
The Harddrive Hi-Volume/Pressure Oil Pump is specifically engineered for Milwaukee-Eight engines, providing significantly enhanced oil circulation and cooling. This pump is a critical upgrade for any performance-oriented M8 build, ensuring your engine gets the lubrication it needs under demanding conditions.
Why riders pick this
- Significantly increases oil feed and scavenge rates
- Boosts oil circulation and cooling for M8 engines
- Crucial upgrade for high-performance Milwaukee-Eight builds
- Helps maintain engine longevity under stress
- Includes four mounting bolts for direct installation
When you're pushing your Milwaukee-Eight engine hard, whether on the street or the track, adequate oil pressure and flow are paramount. This Harddrive oil pump is designed to deliver a substantial increase in both feed and scavenge rates compared to the factory unit. This improved flow helps maintain optimal oil temperature, reduces aeration, and ensures consistent lubrication to all vital engine components, contributing to better performance and longevity for your M8.
Optimized Oil Flow for Performance
- Enhanced feed and scavenge rates over OEM specifications
- Designed to improve oil circulation and engine cooling
- Helps maintain consistent oil pressure in high-stress situations
- Essential for high-performance Milwaukee-Eight engine builds
- Includes four mounting bolts for installation
Installation Considerations for M8 Engines
This Harddrive hi-volume/pressure oil pump is a direct fit for Milwaukee-Eight engines. It's important to note that this specific pump does not include the factory oil seal, which must be purchased separately. This allows builders to choose their preferred seal or replace it as needed during a performance engine overhaul. Upgrading your oil pump is a fundamental step in building a reliable, high-output M8, ensuring your engine's heart beats stronger and cooler.
Specifications
- Brand: Harddrive
- Manufacturer Part #: 81080
- UPC: 191361165412
- Length: 5.11 in
- Width: 6.3 in
- Height: 3.94 in
- Weight: 2.09 lbs
- Country of Origin: China (Mainland)
Common questions
Do I need to buy an oil seal separately for this pump?
Yes, this Harddrive oil pump does not include the factory oil seal. You will need to acquire one separately to complete the installation.
What kind of performance improvement can I expect over the stock M8 pump?
This pump is designed to deliver increased oil feed and scavenge rates compared to the OEM Milwaukee-Eight pump, leading to improved oil circulation and cooling, especially beneficial for performance applications.
Is this pump a direct bolt-on replacement for the Milwaukee-Eight?
Yes, this Harddrive oil pump is designed as a direct replacement for Milwaukee-Eight engines. It includes four mounting bolts, but remember the oil seal is separate.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Harddrive |
| TYPE | Engine |
| SKU | 820-50002 |
| WEIGHT | 2.09 lb |
