- Joined
- Dec 7, 2020
- Posts
- 6,891
- Reaction score
- 17,445
- Location
- Minneapolis, MN
- Ram Year
- 2017 2500 Laramie Crew Cab
- Engine
- 6.4L HEMI
Today I wanted to test Hemi engine pre-lube functionality without AlphaOBD or other tuning. It was mentioned elsewhere in the Forum. My truck has been sitting unused for weeks. I'd been riding along in other's vehicles instead.
This consists of depressing the gas pedal to the floor and holding there, depressing the brake pedal and holding per usual for starting, then pushing engine start button.
The engine does indeed crank over without starting! A couple of bursts of this will send oil up through this marginally-lubricated engine before starting. This is helpful for those of us that don't drive every day, or much at all for that matter.
A bit of a surprise was the engine kept cranking until you push the start button a 2nd time! Be carfeul not to fry the starter motor by cranking too long! I recall something like 20 second start burst and 20 second cooldowns are suitable for electric starter motors. I'd estimate 3 of these cycles will circulate enough oil around for starting 'wet'.
Just to be complete - the process ends when you release the gas pedal. Then the engine will start.
Owners that want to complete their lubrication upgrade can do so with appropriate tuner adjustment to increase engine idle from 650 rpm to 750 rpm, the standard idle rpm before U.S. EPA CAFE regulations came along.
Disclaimer - my truck is fourth generation (I think), 2017 Ram 2500 Heavy Duty with 6.4L Hemi Engine. I can't vouch for all model years and Hemi engines.
This consists of depressing the gas pedal to the floor and holding there, depressing the brake pedal and holding per usual for starting, then pushing engine start button.
The engine does indeed crank over without starting! A couple of bursts of this will send oil up through this marginally-lubricated engine before starting. This is helpful for those of us that don't drive every day, or much at all for that matter.
A bit of a surprise was the engine kept cranking until you push the start button a 2nd time! Be carfeul not to fry the starter motor by cranking too long! I recall something like 20 second start burst and 20 second cooldowns are suitable for electric starter motors. I'd estimate 3 of these cycles will circulate enough oil around for starting 'wet'.
Just to be complete - the process ends when you release the gas pedal. Then the engine will start.
Owners that want to complete their lubrication upgrade can do so with appropriate tuner adjustment to increase engine idle from 650 rpm to 750 rpm, the standard idle rpm before U.S. EPA CAFE regulations came along.
Disclaimer - my truck is fourth generation (I think), 2017 Ram 2500 Heavy Duty with 6.4L Hemi Engine. I can't vouch for all model years and Hemi engines.