Anyone using Honda S2000 engine

[Maverick1]

For those of you who have the WCM ultralight sevens, do they offer a vinyl top for your cars? From the pics I have seen you don't have doors like the Caterhams.

cheers

[WestTexasS2K]

tops are an option. The old website had pics of a blue car with a top but he updated the site and tooks some of the pics off. The top use to be a 1500.00 option. I am not sure if that price is still good or not.

[WestTexasS2K]

My Honda factory service manual states the stock internal oil pump's capacity as 58.4 L/min at 6000 rpm and it's pressure limit as 85 psi at 3000 rpm. I have a hard time believing that the factory manual is wrong and the actual pump output is 100 L/min.

Based on my industrial hydraulics experience, for the 100L/min the recommended line size ID would be nearly 3/4" on pressure side (this is based on a recommende 20 ft/min max velocity, hydrualic oil viscosity, and typical hydraulic system pressures of 1000 psi and up). The recommended suction line size would be a wopping 1-5/8" ID. I know the stock Honda oil passages are smaller on both accounts. By comparison, the line sizes would be 9/16" and 1-1/4" for the 58.4 L/min. The 9/16" seems to closer match the stock engine.

I am dry sumping my engine, but a still a long way off getting to the point where I know whether I've sized the pump and belt drive ratio correct. I used the info from the service manual to size the pump. I figured this was safer then basing it on unconfirmed information. I have the flexibility in my setup to speed the pump up and get significantly more flow out of it if required, but hopefully it will work correctly as intended.

 

Ok good to know. I have not looked in the manual because I have not dry sumped and dont intend to anytime soon. Manual says 58.4l at 6000 the 100l is was quoted at 9k. An additional 3000 rpm at crank will be 6000 more rpm on the pump. I am not sure if the flow is proportionate to engine rpm I would assume it is. That being the case the flow at 9k rpm has to be a good bit more than 58.4L. What it is I dont know. I will let all the engineers on the site do all the math if they want.

[Birkin42]

Oil pumps are positive displacement so the flow is directly proportional to the rpm minus a very small amount for internal leakage. Therefore the flow at redline (9000 rpm) should be 87.6 L/min. If the motor cannot flow this amount, the relief on the pump will dump the excess. You will know if this is happening since the pressure gauge will be pinned at the relief valve setting, which in the case of the S2000 is at 85 psi.

[Mondo]

I'm getting a top (weather kit) for mine. It comes with a driver's wiper (only get 6 inches of rain a year so it's not likely to be used). I bought it for the early morning winter rides. I will probably get some kind of bikini top as shade is more important than rainproofing around here...