With the intake rubber fitment problem overcome, I could finally mount the entire throttle body assembly onto the bike. This was a moment long coming. Thankfully it all fit. The four throttle bodies slid into the intakes a lot easier than the carbs did, which isn’t surprising since the “barbs” are much smaller now. The …
Continue reading ‘Microsquirting the NC30, part #23: We have ignition’ »
Unlike previous posts, there will be no gasoline splashing in this episode. This one is all about CNC goodness. There is one final part to fitting the throttle bodies that I’ve not touched upon yet. The stock carbs mount to the intakes using short rubber couplers. The throttle bodies have a slightly larger diameter intake …
Continue reading ‘Microsquirting the NC30, part #22: Mounting the intake rubbers’ »
As mentioned in the last post, now that the injectors are mounted in the fuel rail and there are no leaks, it’s possible to measure the injector performance. A fuel injector is essentially a very fast-acting and well calibrated valve. It has an electromagnetically actuated plunger that opens when current flows through the solenoid, letting fuel …
Continue reading ‘Microsquirting the NC30, part #21: Injector characterization’ »
With the fuel rail parts completed, it was time to assemble it and see if it worked. Step one was to replace the seals on the injectors. I’d ordered a replacement seal kit from “Mr Injector” a while ago but didn’t want to replace the existing O-rings until I was mostly done with all the …
Continue reading ‘Microsquirting the NC30, part #20: Leaks…’ »
In the last post, the first half of the fuel rail, for cylinders 2 & 4, was made. Now it’s time to complete the other half. This will hold the injectors for cylinders 1 & 3 (the rear ones), plus the fuel pressure regulator. I fiddled a lot with the fuel pressure regulator to get …
Continue reading ‘Microsquirting the NC30, part #19: The other fuel rail’ »
The last post described how the injectors mount into the throttle bodies. The next step was was to get fuel to their upper parts. This is commonly done by using a “fuel rail”, in which fuel is pumped past the injectors, to the fuel pressure regulator, and then returns back to the tank. By having fuel …
Continue reading ‘Microsquirting the NC30, part #18: The fuel rail’ »
The throttle bodies I’m using originally used a different brand of injectors than the Bosch EV6 ones I’m going to use. Most injectors need a 14mm diameter hole, so that was not a problem, but the hole was too shallow to allow the EV6 injectors to seat fully. Thus, minor surgery on the throttle bodies …
Continue reading ‘Microsquirting the NC30, part #17: Mounting the injectors’ »
In the last post, I described the machining of the throttle body adapters. Once those were done, it was time to move along to make some brackets to hold the throttle bodies in position. Since it is a V-4 engine, the two rows of throttle bodies are at an angle to each other. They are …
Continue reading ‘Microsquirting the NC30, part #16: Mounting the throttle bodies’ »
It’s been a while since the last post on the NC30 EFI conversion. I was concentrating on getting the CNC mill up and running so I could make some parts. As you may recall, I had designed a bunch of little pieces for holding the throttle bodies and attaching them to the airbox that would …
Continue reading ‘Microsquirting the NC30, part #15: Production’ »
It’s been a while since the NC23 figured in the list of projects. It hasn’t been ridden much over the past half a year, because it would leak gas from somewhere around the carburetors, and I was busy with the NC30 project. However, finally the state of Hawaii ensured the NC23 got some love, since it …