I’ve been poking around more looking at available throttle bodies online. Brand new after market throttle bodies run as cheap as $131 from JC Whitney. Once I get my hands on a set of PC800 carbs, I can start looking more in earnest at available automotive throttle bodies. Maybe I can even find one that has the injectors already integrated. Seeing all of the options on JC Whitney makes me hopeful that it will be easy to find what I need and inexpensive, too. Alternatively, like I’ve mentioned on here before, I’ll gut out a set of PC800 carbs and use the throttle bodies from them. There is a set on ebay at the moment for $185. That seems a bit high. Hopefully a less expensive one will come along.
I went on a quick jaunt out to Toledo to see Kellen and Melibe. Total distance was about 113 miles. This was the first time that I had seen Melibe since Tunisia when I was traveling with my parents. I know I saw Kellen since then but I can’t remember when the last time was we actually bumped into each other. Hopefully it won’t be another five years until we see each other again!
I really need to start logging my rides more often. My PC800 is now at 50400 miles. It’s just finally getting broken in.
The thinking, exploring, reading, and slow comprehension of how big and expensive this project is continues. Lately I’ve been thinking about injector manifolds and throttle bodies. I’ve also continued to think about longer intake runners.
Looking at where to put injectors into the engine for direct port injection, I could remove one of the two spark plugs and use the open spark plug hole to inject. However, there’s probably a reason that Honda put two spark plugs in the engines. I don’t think it would be wise for me to mess with that.
I could potentially drill into the intake header on the engine and install the fuel injector there. However, I’m very leery of drilling into the engine. I want to be able to reverse whatever I do if I screw it up.
Just below the carb insulators there is a flat spot that could be drilled out to accommodate a fuel injector.
To be on the safe side, I think I will get a couple of aluminum blocks, bore out the middle of them for airflow, and then drill and tap in holes for the injectors. One thing I still don’t know about is if I need to have the injectors angled in a certain way or not. Can they jut out at 90 degrees or do they need to be turned toward the valves? Would it be better to have the injectors staring straight down the barrel of the intakes and have the air curve around to the side?
One person on the IPCRC suggested I switch from dual throttle bodies to a single throttle body. Evidently many car engines ran on single throttle bodies. However, several websitessuggest (to me anyway) that it’s better to go with multiple throttle bodies because the rider will have more control and better response. I think I will try to stick with two throttle bodies. If possible, I’d like to reuse the ones in my carb. Just have to figure out how to hack off all the extra bits of the carb I’m not using…
Intake runner length continues to kick around in the back of my mind. A few conversations on the IPCRC got me thinking about it. It seems like it could be a nice little power boost if I could actually figure out the correct runner lengths. Perhaps I will setup the bike so I can change in and out different lengths of tube. Once I get FI timing and whatnot down, then I can play with tube length.
The Suzuki GSX1300R has nice fuel injector-equipped throttle bodies. The Honda CBR600 also has fuel injected throttle bodies. So does the CBR1000. I wonder if perhaps I can find one of the proper diameter to drop onto my engine. There certainly are enough sets of them for sale on EBay. What sport bike, street bike, or cruiser has fuel injection, only two cylinders, and has in the range of 1000cc worth of displacement?
