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Author Topic: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)  (Read 50500 times)

Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #70 on: Aug 10, 2013, 01:42:33 »
I'll look into it, but a potentiometer might not have a useable range where is needed.
Right now I have 2 and 3 10k @ 1/8 watt resistors in series on each side of a variable reluctor.( pickup coil )


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Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #71 on: Aug 10, 2013, 23:35:54 »
Got the resistors sorted out and dwell time/pulse width goes from 6.5 to 75+.
With fuel pressure set at 30 lbs. that is enough for 48 h.p., a little more than the engine will currently produce.
And 3.5 h.p. at idle. First thing tomorrow I'll test with the peak and hold injectors.
All testing so far has been with Bosch saturated injectors.
Went to the hardware store and bought some over priced brass fittings for a fuel rail.
These different injectors have hose barbs instead of a rubber o ring.
Oh, about the jetting on the Keihin carbs the 130s leaned out above 7000 r.p.m. and a spot  just above idle.
I'm thinking 140s.


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Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #72 on: Aug 12, 2013, 22:05:26 »
Peak and hold injectors will not work with this configuration.
They got warm and didn't produce the range needed.
So I had to Fab up a fuel rail for the Bosch injectors.
First pic shows a GPZ1100 fuel injection rack similar to the one used and the difference in the injector bottoms.
Plastic had to be trimmed and the o ring swamped for the one for the rack.
Other pics show the finished product with a different routing of the fuel lines.

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Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #73 on: Aug 12, 2013, 22:07:01 »
And the rest.

Offline teazer

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #74 on: Aug 13, 2013, 01:34:53 »
This is nuts.  I love it.

Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #75 on: Aug 14, 2013, 01:19:13 »
Mounted the electronics on a sheet of aluminum and rerouted some wiring.
Fired it up and did some testing with different fuel pressures and some variations of pulse width.
There are two problems I currently am dealing with. One is after reving it up and chopping the throttle it will die.
If I blip the throttle it will idle. Two is the highest it will run smoothly is 5k.
The more I twist it above 5k the more it will waiver up and down in r.p.m..
I'm thinking it's a little rich and want to increase r.p.m. then leans out and returns back to the original speed.
The reason I say this is because if I crack the throttle wide open for a split second I get some black smoke.
Also after I shut everything down for the day I realized I have only one throttle return spring on two butterflies
instead of three on four butterflies. I wasn't watching the throttle shaft for any strange movements so
nothing is confirmed yet. It is a single cable set up so movement is controled in one direction with the 
return spring limiting the other. 


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Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #76 on: Aug 14, 2013, 23:45:28 »
Did a little experimenting today.
The high r.p.m. waiver is caused but over fueling not by the butterflies moving.
Got it dialed in for below 5k. Then reconfigured the wiring and had it loading up at low r.p.m..
But it ran great up top.The reason I think it is over fueling is I have it firing every revolution.
And I believe the automotive industry fires every other revolution. Meaning I'm doubled up on fuel.
Why I say this is because when it was running good at high r.p.m. dwell/pulse width was reading
around 33%. If you double that for 66%, take 66/80 ( where injectors are rated ) = 82.5% of 14 lbs. per hour,
14 x .825 = 11.55 lbs.per hour x 2 ( .5 lbs. per hour for 1 h.p. naturally asperated ) = 23.1 x number of injectors,
 23.1 x 2 = 46.2 h.p.. Which is about what  this engine 'should' produce. Now I just have to get both ends of
the spectrum working together. I hope this doesn't mean I have to eliminate one of the lobes on the cam ring.
By just using the sensor on the cam and removing one lobe I'll automatically cut fuel in half.
The fuel pressure my need to be raised for a good idle and the the whole r.p.m. range would have more pressure.
Leading to over fueling up top again. I would rather use both sensors and cut pulse width down and raise
 fuel pressure for better atomization.


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Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #77 on: Aug 17, 2013, 17:53:09 »
Here is a little something for you to watch.
At about the 1:25 mark you can hear the r.p.m. rise and fall with the throttle held at 7k.
The only electronics for the fuel injection on the bike are the 2 pickup coils and
what is mounted on the aluminum panel. The hei module on the bottom is the only one
used during during the video. It needs more tuning/experimenting and maybe a Cartech
fmu ( fuel management unit ), they have one for naturally asperated applications.
 Vacuum is 10 in. just above idle when the needle settles down. It drops to around 5 in.
when the throttle is cracked open and up a o around 20 in. when the throttle is chopped.
But it is time to invest in a new gauge because with the bike turned off it shows almost
2 in.. As for the blue smoke, the plan is to do up another milled head with a reground cam
and a block punched out to 69mm. That should get me to around 45 h.p..



Hope the link works,first time posting my own you tube video.

Update:
               Cured  the high r.p.m. fueling problem. Hooked up the top module backwards off the pickup coil
 with no resistors and the bottom module has 10 10k resistors on the negative side of the reluctor.
I'll try to post another video tomorrow.

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Editted video to new youtube account.




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« Last Edit: Nov 26, 2015, 23:11:48 by Nebr_Rex »

Offline Nebr_Rex

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #78 on: Aug 18, 2013, 18:09:42 »
I have the new video up. Still a little lean off idle.
Going to try a little more resistance and maybe some more pressure.

http://youtube.com/watch?v=znVqXg4zchU&feature

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« Last Edit: Nov 26, 2015, 23:14:24 by Nebr_Rex »

Offline firebane

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Re: Dr. Jekyll and Mr. Hyde ( a pair of KZ400s)
« Reply #79 on: Aug 18, 2013, 18:25:32 »
I have the new video up. Still a little lean off idle.
Going to try a little more resistance and maybe some more pressure.

http://youtube.com/watch?v=znVqXg4zchU&feature

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I love how it hits 9k and just takes off