FI builders ?

could something like this work? or would it be too easy?
Flygp, thanks for the drawing

 

Here's what the Brits have done to put Fuel Injection on the New Bonnieville.


The Bonneville's fuel injectors are disguised within this carburetor-like assembly, and what looks like a choke lever is actually a fast idle knob.

The Injector is miniaturized and fits in the Diaphragm Cavity.

I imagine the device seen at the side of the Carb Body is a Throttle Position Sensor???

 

a aluminum adapter to fit the O D of the slide bore and a I D to fit the injector. now figure out where the MAF goes. even get to keep YICS

 

Yes it would work, but one issue with this idea is the fact that you still have a restriction at the venturi. I tried a few ideas along these lines a few years ago, and there is not enough metal in the carb to machine out the venturi.

The second issue is you do not want to inject fuel on the back of the throttle valve as you will get low speed and idle problems. The Triumph set up has the injector angled so the fuel exit is on the engine side of the throttle plate.

 

At the end of the Airbox Intake Rubber Snorkel that directs Atmosphere toward the Air Filter.

 

If I were to go this route I would do something similar to darkfibres post. But I would weld in a bung. SDsfi (i think) has some bungs that have a top cap that holds the injector in place and a barb for a hose.

personally I wouldn't waste my time. Plus the amount of time, money on bungs and money for a tig machine or a welder to do it would be cost prohibitive.

Especially when efi throttle bodies can be had in the $100 range.

CV Carbs can be tuned just as good as efi for performance. but if you looking for performance and economy and the ability to "rejet" on the fly EFI is the way to go.

Even for boosted applications carbs work great. Although packaging efi is nice.

I have a 83 rx7 that was efi with staged injection on a pair of dcoe patterned 52mm throttle bodies from extrudabody.

It was nice. no more left turn fuel starvation. My economy went from 15mpg to 18mpg street and 22 average highway. It had to come off because its not emission legal and the car needed to pass smog. I hate the nikki carb on the car with all the emission crap. It makes the car run like crap.

ironically the car ran cleaner on the megasquirt efi.

I have an efi setup for my 660 conversion fzr600 for when ever I get around to finishing that bike.

 

I'm surprised, ... after all these years ... that somebody didn't come-out with a "Bolt-on Kit" to install Fuel Injection on these Bikes.

 

Not exactly our carbs, but same thing different bike. Here is a guy that created a conversion for CV Carbs.


http://roadstercycle.com/yamaha_vmax_fu ... cv_car.htm

 

I reviewed the information at the LINK provided.

After you get the Injectors ... you still have a Boat-load of Fabricating to do.

And, ... the price ... even if you are skilled enough to do it all yourself ... doesn't justify the minimal gains for all that money, time and effort.

 

Injecting at right angle to airflow is not optimum. Agree with DF's points, maybe the venturi can be bored out?

Edit missed the bit where he said can't be bored out

 

I agree with you. Until they come up with a plug and play kit, doing it is worth more than my bike. I like the concept of what he did.

 

it gets pretty expensive to reinvent the wheel
this
is more my speed

 

Too much work.

I thought I went over-the-edge when I ColorTuned the SnoBlower.