Canton Racing Products recently published a blog post covering the “Do and Do Nots” of Accusump installation. This piston-style oil accumulator is used in racing applications to prevent oil pressure drops and supply oil pressure to bearings prior to engine start-up. Proper installation will ensure the Accusump provides all its designed benefits. Along with a detailed Accusump installation guide, Canton provides some tips to help avoid common mistakes.
Clamp mounting location is vital for structural integrity and effective operation. The clamps should be mounted on the very ends of the Accusump. The end caps are a screw-in design and benefit from the additional structural integrity provided by the clamps. In addition, clamping force can distort the tube and limit piston movement when clamps are mounted anywhere other than the ends.
Locate the Accusump in an accessible location that provides protection from radiant heat. The piston design allows the unit to be mounted in a vertical or horizontal position, increasing mounting location choices. Avoid areas that are close to the engine or exhaust headers. Adding additional heat from these sources will increase oil temperature during operation and thermal expansion will cause a pressure increase inside the unit when the valve is closed. Header wrap can be used as an added layer of protection from radiant heat. Proper pre-charge pressure will help with thermal expansion. However, a low charge will allow internal pressure to rise rapidly. If the pressure relief valve is discharging oil, there is a good chance the pre-charge is low.
Clamps should be placed at the very ends of the Accusump unit.
Pre-Charge, Pressure Relief, and Oil Control Valves
Pressure relief valves are set to discharge oil at 175 PSI. Canton states that they often see the pressure relief valve removed due to oil discharge. However, the reason for oil discharge needs to be determined and corrected. Removing the relief valve only masks the issue. During installation of the oil control valve is the only time the pressure relief valve should be removed. After installation, the pressure relief should be re-installed with pipe tape.
Oil discharge is commonly tracked back to inadequate pre-charge pressure. The installed pressure gauge assists in diagnosing concerns by showing pre-charge pressure when empty and accumulated pressure when full. Keep the pressure gauge installed for quick pre-charge verification and helpful diagnosis information when needed. Canton’s tech support line is also available for assistance if needed.
Selecting the proper oil control valve is also vital. The oil control valve allows the Accusump to deliver oil to the engine prior to startup and keeps excess oil out of the oil pan after shutdown. There are three different types of valves available, so be sure to check out Canton’s blog post on valve selection.
Never remove the pressure relief valve other than to install the oil control valve. Make sure to use thread sealant when reinstalling.
Finally, Canton offers a rebuild service that should be utilized if the need arises to disassemble the Accusump. They have designed specific procedures and jigs to properly disassemble and rebuild the unit without damaging the tube or internal components. Any distortion in the tube will cause limited piston travel and improper O-ring seal. In the event of engine failure, flush the unit and then pressure check it. Take advantage of the rebuild service rather than trying to disassemble the Accusump yourself.
The Accusump provides an added layer of protection against costly engine repairs or replacement. All of the benefits the oil accumulator is designed to provide can be accessed by following these installation tips.