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Old 10-12-2019, 10:01 PM
RICE RACING RICE RACING is offline
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Join Date: Oct 2003
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Default Re: RICESP Water Injected RX7

Quote:
Originally Posted by Rub20B View Post
I assume here you mean per rotor? an NA streetport REW engine (9:1) at sealevel with xcessive LIM makes 170-180 crank hp.

Offcourse as you say depending on the knock tolerance of the fuel the spark efficiency will generally get lower the higher the chamber chrarge and charge temp.

I will post here how it turns out.

At work we ran 1 cyl DI development engine with a pre chamber, 10:1 CR, port water inj at 7000 rpm 32 bar bmep with lambda 1 and optimal spark (50% burn around 8 deg atdc). water rate 50 to 55% of fuel mass. this is could be considered state of the art but if the water stops piston is gone before you can count to 10.

I assume on this evo you could run similar water rate but perhaps are still a bit more knock limited. the burn duration of the pre chamber combustion process is very short, giving the mixture less time to knock. Do you have cylinder pressure indication system? I would be interested what kind of spark efficiency can be reached on a port fueled engine running these loads and pump fuel.
180/2.616 = ~69bhp/lt/bar
NA engines always runs worse map/tip which effects the power output in a negative manner, and without knowing what level of street port as well means that your figure could be in the mean average of what to expect?

Video here to watch > https://www.youtube.com/watch?v=Hlbcnjc53mE



Maybe easier to email me mate?
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