Kawasaki KR-1RR IFI Build

Show us that box of bits in your shed!
User avatar
KR-1R
Premix Junkie
Posts: 1535
Joined: Wed May 16, 2007 2:24 am

Re: Kawasaki KR-1RR IFI Build

Post by KR-1R » Mon Apr 27, 2020 1:22 pm

Image

Image

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

User avatar
JanBros
Avgas Sniffer
Posts: 3185
Joined: Wed Jul 26, 2006 11:50 pm
Location: the land of Francorchamps
Contact:

Re: Kawasaki KR-1RR IFI Build

Post by JanBros » Mon Apr 27, 2020 11:27 pm

the higher the BMEP, the more dificult it gets.
My ultimate goal is to die young as late as possible !

User avatar
KR-1R
Premix Junkie
Posts: 1535
Joined: Wed May 16, 2007 2:24 am

Re: Kawasaki KR-1RR IFI Build

Post by KR-1R » Tue Apr 28, 2020 12:14 pm

.
.
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

User avatar
JanBros
Avgas Sniffer
Posts: 3185
Joined: Wed Jul 26, 2006 11:50 pm
Location: the land of Francorchamps
Contact:

Re: Kawasaki KR-1RR IFI Build

Post by JanBros » Tue Apr 28, 2020 11:38 pm

KR-1R wrote:
Tue Apr 28, 2020 12:14 pm
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.
My ultimate goal is to die young as late as possible !

Post Reply