Accusump - pros & cons

[Chevy55]

Originally Posted by Larry Hill

Old car has an Accusump new car does not. During a freshen up in my backyard both engine bearings , 440 RB and 392 DP, look good. What I'm most happy about it the big end of the rod is still round. What I think is the biggest help in keeping the big end round is the clean neutral at the end of the run and engine shut off. It helps eliminates compression breaking of the engine.

I will install an Accusump on this years dyno session and install in the car to help on engine starts. I might want to install a sight glass on the pan to see where the oil level goes on a pull.

I'm assuming the volume of oil in the accumulator and its pressure follows the engine pressure. We charge the bladder to 20psi.

The only draw back I can think of is: three more places for a potential leak.

If you charge the bladder at 20 psi the accumulator will not start filling till it overcomes the set pressure of 20 psi. I set it up by opening the valve and putting in about 60 psi to insure the piston is at the bottom then drop the pressure back down to 5-7 psi. The accumulator will continue to push oil back into the engine until it reaches the set pressure then it will be empty. I do have a sight tube on the pan and by starting the engine with the accumulator valve closed then starting it with it open I can understand how much oil is actually in the accumulator.