Prometheus in a 1979 Honda CB650 Motorcycle.
Posted: Wed Apr 15, 2020 1:38 am
(THIS IS SUPER PRELIMINARY, I DON'T HAVE ANY OF THE PICTURES UPLOADED YET)
The scope of this project is to covert an originally carbureted motorcycle with an extremely primitive ignition system into a fuel and spark controlled engine using the Prometheus ECU.
Parts selection:
ECU: At the end of the day the choice to run Prometheus came down to three things.
1) It has built in bluetooth, this will be excellent when it comes to tuning.
2) it has a built in wideband controller. Space is a premium on this motorcycle so the smaller and more contained I can make this system the better.
3) The bike has some very weird CDI system on it and the potting has long leaked out. In an effort to save some money the Prometheus ECU is capable of driving dumb coils (no igniter built into them)
Throttle bodies (intake system):
The throttle bodies came off of a 2001 Honda CBR600F4I, the spacing between the two banks of 75MM was perfect to fit the 1&2 and 3&4 banks together. Slight modifications were made to the Throttle bodies in order to get them to fit in the middle where the spacing was 80mm. My throttle bodies included everything needed for the intake, Injectors, MAP sensor, TPS, IAT, and a fuel pressure regulator.
Fuel pump:
This was arguably one of the harder pieces to find. With these old charging systems you need to conserve as much power as possible. so finding the smallest fuel pump to fit the bill was critical, I ended up using [this] fuel pump to run the system.
(Attach image here)
Crank positioning:
The stock system had a mechanical advancer on it and a single tooth, this just wouldn't do so a tone wheel was designed in solidworks to replace the original ignition wheel but use the original VR sensor. I was able to get one of my machinist buddies to make this part for me which was able to drop in the factory location and cinch down with the original nut. No modifications necessary. I want to explore fixing the mechanical advancer to the shaft and try to run the system off of a single tooth trigger wheel in the future but that is at a further date.
(attach screenshot here)
Oxygen sensing:
Nothing special here, just the most generic 4.9 lambda sensor I could find on Amazon wired back in to the Prometheus ECU.
Assembly pictures:
Anything I didn't capture above will get stored here and then added to a category later.
Configuration:
( I will continue to fill this out as I go through the tuning process with the bike.)
The scope of this project is to covert an originally carbureted motorcycle with an extremely primitive ignition system into a fuel and spark controlled engine using the Prometheus ECU.
Parts selection:
ECU: At the end of the day the choice to run Prometheus came down to three things.
1) It has built in bluetooth, this will be excellent when it comes to tuning.
2) it has a built in wideband controller. Space is a premium on this motorcycle so the smaller and more contained I can make this system the better.
3) The bike has some very weird CDI system on it and the potting has long leaked out. In an effort to save some money the Prometheus ECU is capable of driving dumb coils (no igniter built into them)
Throttle bodies (intake system):
The throttle bodies came off of a 2001 Honda CBR600F4I, the spacing between the two banks of 75MM was perfect to fit the 1&2 and 3&4 banks together. Slight modifications were made to the Throttle bodies in order to get them to fit in the middle where the spacing was 80mm. My throttle bodies included everything needed for the intake, Injectors, MAP sensor, TPS, IAT, and a fuel pressure regulator.
Fuel pump:
This was arguably one of the harder pieces to find. With these old charging systems you need to conserve as much power as possible. so finding the smallest fuel pump to fit the bill was critical, I ended up using [this] fuel pump to run the system.
(Attach image here)
Crank positioning:
The stock system had a mechanical advancer on it and a single tooth, this just wouldn't do so a tone wheel was designed in solidworks to replace the original ignition wheel but use the original VR sensor. I was able to get one of my machinist buddies to make this part for me which was able to drop in the factory location and cinch down with the original nut. No modifications necessary. I want to explore fixing the mechanical advancer to the shaft and try to run the system off of a single tooth trigger wheel in the future but that is at a further date.
(attach screenshot here)
Oxygen sensing:
Nothing special here, just the most generic 4.9 lambda sensor I could find on Amazon wired back in to the Prometheus ECU.
Assembly pictures:
Anything I didn't capture above will get stored here and then added to a category later.
Configuration:
( I will continue to fill this out as I go through the tuning process with the bike.)
