Kawasaki KR-1RR IFI Build

[KR-1R]

I think if it works on a dirt bike it would work better on a road bike

[JanBros]

the higher the BMEP, the more dificult it gets.

[KR-1R]

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forced induction engines require higher fuel pressures to combat the environment (∆P ?) they are trying to inject into
similary a Gasoline Direct Injection engine typically may have fuel rail pressures ~1400 psi because you are trying to inject into an environment of 10-13 atmospheres
(you require more puff to start blowing up a balloon)

for a 2T have the Engine Management System sample the crankcase pressure (MAP) at say 70° ATDC (before any ports open) and make a decision against what the Mass Air Flow (MAF) sensor (upstream of reed block) sampled say 90° earlier. These two things would give you a good idea of how fast and how much air entered into the engine as well as the load on it. Add in throttle position sampling .... air temperature, RPM, and even EGT

all these parameters can be acquired (DAQ) on a test bike running carburetors
somewhat like how MJ43 reverse engineered the ignition timings (MJ43 hacks the curve with an oscilloscope
viewtopic.php?t=5308)
Then its a question of fuel necessary at each RPM for the output - eddy current dyno

calling Scooble who did alot of this for profession

control the fuel, gives you benefit you can then control the oil - the KTM/Husq fuel injected 2T run oil at 70:1 to 100:1

[JanBros]

for a 2T have the Engine Management System sample the crankcase pressure (MAP) at say 70° ATDC (before any ports open) and make a decision against what the Mass Air Flow (MAF) sensor (upstream of reed block) sampled say 90° earlier. These two things would give you a good idea of how fast and how much air entered into the engine as well as the load on it. Add in throttle position sampling .... air temperature, RPM, and even EGT

that way you know how many air/mixture has entered the crankcase, but you still do not know how many has gone into the cylinder.
when on the pipe, 2-stroke will keep running without reeds/rotary-valve, the pipe sucks directly on the carburetor. How much the pipe sucks depends on a lot of factors. it is not as straight forward as in a 4-stroke.

[Buldogo2]

Thought you guys would like a small update, so I have posted an update on the openings post of this topic.

The KR1 has a lovely place in the living room, but physical work is finally starting.


Not have been sitting still, but progress has been slow. A lot of work has going into planning, designing, revers enginering.

Me and my friend (who is building the same bike up with me) are trying to finish the rolling chassis this year so we can focus on the tank and body next.