Are you building a sick Kseries beast and plan on reving the engine over 8500 rpm? If so this is a must have piece. If your going to spend top dollar building an awesome engine you might as well add an extra layer of security and pick up this oil pump kit!
ERL has done a great deal of testing on the various pumps and have built an oil pump dyno that matches the crank w/the gear, tensioner, guide as they're mounted on the block. This gives them an actual assesment of the pumps in their mounted condition. They are then able to spin the pumps to over 10,000 rpm crank speed and measure the flow and pressure in increments. They can also test various oil wts., oil temps, head heights.
The ERL Performance Oil Pump is designed for the Honda K-series engines. This oil pump gives the Honda K-series engines the ability to run above 8500 RPM without cavitation. This product is the combination of a Honda F-series oil pump with an ERL Performance adapter kit. This conversion requires a Honda K24 oil pump chain, tensioner and oil pan.
"The ERL S2000 modified oil pump we sale does require the K24 oil pump chain, tensioner and oil pan. Obviously if you have the K24 block then your fine but if you need this to run on the K20 bottom end then you'll need those three things as well and they will just bolt right up. We have some brackets, bolts and some machining done to the pumps in order for it to work and works nice since it's just a direct bolt on. Our pump was used last season in the Clutchmasters white hatch a/m street class car and had no problem revving to 10.2k . We tested the K20 pump and the modified S2000 pump and found the K20 to start cavitating at 8700 rpm so that's why we modified the S2000 pump. You can send us the pump if you already have it and we can modify it if you like.(PM me for pricing on just the modifications)
- Sean of ERL"
The S2K pump has a different bolt pattern and lacks a provision for the tensioner.
Honda redesigned the oil pump for their 9K S2K motors rather than just using the pump they already had for a reason. We took all 3 pumps to the largest manufacturer of Gerotor gears ( make the gears for Porsche to Catapillar) and went over all the issues. There is a huge amount of info. on causes of cavitation, aeration, etc. , but the S2K pump is built about as good as can be and still work in the application. This has been went over in several previous threads.
The difference in the 2 can be seen on an oil pump dyno. The RSX begins falling of between 8500-9000 (with gallons of oil to feed it, so a baffle doesn't cause it not to fall off). A baffle is good for road racing, but helps with a different issue.
Quite simply Honda designed a pump to do >9K and one for <9K. Use the pump for your application. That's why we've offered both.
There has been some slight variations of the RSX pumps, but it doesn't seam to have a pattern of one being used on a particular model or have a definetive marking on them.
The changes I've seen only involve the shape of the step porting that will only work to remove "pulses" in the pressure. This won't have a large affect on the pumps performance and isn't worth hunting for a particular one.