KZ650 C2 Fuel Injection Conversion

I was out doing some work on my lathe so decided I would modify the Ford injectors to take a 5/16" fuel injection hose.

Here are the stock injectors setup for a fuel rail (O rings on top) :



The molded plastic needs to be trimmed from the rail side enough to hold a band clamp. The steel tube is exactly .31" so does not need to be touched.





They are how ready to have a hose crimped on.

Another step closer , what sort of fuel pressure will you be running ?

Those stock injectors are flow rated at 43.5 PSI but I am not sure what the maximum output of a stock ZX6 fuel pump. As far as I could gather the ZX6 manual says 41-44 PSI but that is to be determined. I do have a adjustable regulator but not even sure how much effect it will have, its off a 914 Porsche.

At 43.5 PSI the maximum HP those injectors can achieve is 25 each. This engine will not be capable of that in its current build configuration, probably somewhere in around 85 HP total. Anywhere between 30-50 PSI to where it runs optimally, I will have a pressure gauge installed right at the regulator.

That is the crap shoot of mixing and matching non stock components, I just don't know until I start it up.

I guess ultimately HP will be determined by "flow rate" and the duty cycle of the injector pulse

Wookie58 wrote:

I guess ultimately HP will be determined by "flow rate" and the duty cycle of the injector pulse
 

Yes, that flow rate is at a normal 80% duty cycle you would expect in a street application, you could turn it up higher to race spec (95%) but that just creates extra heat for not much more HP gain (4 HP per injector) There are plenty of tuning options on the fuel and spark maps stored in the ECU.

Once I get the engine built I will probably run it on carbs for the initial break in, that way I can take my time tuning the injection.

Wet and miserable out so decided to bolt the injectors onto the throttle body in my office.



Cut and crimped one outside supply line so I can see how badly it fouls with the petcock when installed. I cut the hose to 4" which I think is plenty to see where the GPZ fuel rail will sit. Once I establish the optimal location I will cut the rest to match as I may end up trimming some length off.



I have a Pingel petcock that I am using on this build and will be fabricating a custom mount plate so I can mount the petcock anywhere between the stock tanks 43mm bolt locations.

Will try to dublicate your fuel injection conversion, have multiple sets of all GPZ 1100 UT (ZX1100A) injection parts.
But have to finish my frame, wheel and the 530 chain coversion on my Z1 first.
My buddys HD WP USD fork/brake conversion also took a lot of my wrenching time i don´t have....