To get rid of the K24’s balance shafts we used 4-Piston Racing’s balance shaft removal kit. This includes aK20 oil pump, a K24 pump chain tensioner, chain, and chain guide. The balance shafts spin at 2x the engine speed and are responsible for a lot of oil heating and aeration while creating a lot of friction. The balance shaft help cancel an inline 4 cylinder engines inherit up and down shaking moments and have nothing to do with its dynamic balance so deleting them will not harm the engine.
The stock K20 oil pump begins to cavitate at 8000 rpm, heating the oil and reducing the pump’s flow. 4-Piston ports and smooths the pumps internal passages to increase oil flow by 25% and allow continuous operation above 9000 rpm. The pump has been tested to 11,000 rpm without issues.
One of the most important things often left out in an engine build is the windage tray. The windage tray helps strip oil off the rotating crank and rods and return it to the oil pan. The windage tray helps to free up power wasted on oil windage, reduce oil burning, lower oil temp and by helping keep more oil in the pan, improve lubrication by reducing the chances of oil starvation. The windage tray is part of the balance shaft removal/ pump installation kit.
For improved reliably we used ARP head studs, these replaced the original Honda torque to yield head bolts. The ARP studs are made of 8749 Chrome Molly and have a tensile strength of 180,000 psi, much stronger than the OEM bolts. They can also be tightened and loosened many times, unlike the stock torque to yield bolts. We used part numbers 208-4701
To help our engine balance at high rpm with its long 99mm stroke we used a Fluidampr part number 570601. Instead of the traditional tuned inertia ring bonded to the damper’s inner hub with elastomer, the Fluidampr’s inertia ring is free to move inside its housing that is filled with a thick viscous silicon fluid. By being free to move, the Fluidamp is able to work more effectively to damp out torsional vibration over a wider rpm range than a traditional elastomer damper. It is both frequency and amplitude sensitive being that the more the crank twists the harder it works. Long-stroke engines can use all the help they can get with torsional vibrations at high rpm and we have had great luck with the Fluidampr on racing K24 engines in the past.