Topic: Getting closer...CB750A supercharged-fuel injected

[rickmoore24]

wowzers, the work you're doing is great!

[fmctm1sw]

Just noticing this thread.  3 words...  WTF!? (in a good way)

[Syscrush]

23tbucket, I like your updates so much I might offer to start giving $5 to the United Way every time you post one. 

[23tbucket]

The intake plenum; I originally carved out some foam from a spray can. I thought I could just cover the shaped foam with the fiberglass and then use acetone to eat away the foam......Acetone dosn't eat the can sprayed foam!!!, So then I went to the hobby shop and got some plasticine...shaped it, covered the plasticine mold in fiberglass, and cleaned out the plasticine with tools, gasoline, and the wifes dishwasher!!!!

I thought about using some sort of by-pass system as 750essess mentioned. It would have been a lot less work. I could have run some tubing out from my blow-off valve, set up some kind of linkage to control some sort of sliding sleeve valve or port. It would have to be open when the throttle is closed and would close as the throttle opened. It would have taken a lot of tinkering to get things just right.

I talked to a drag racing friend......he showed me where the carbs and throttle bodies were on his dragsters.....Yep! on the intake of the superchargers................

[lordmember1969]

Hi:)
LOVE YOUR BUILD:) Question.. do you think i can go kick only onthe fuel injektion with the mickrosquirt.. Will it work? Or do i have to keep the starter?

Thanks

LM

[Old Scrambler]

Awesome..........I knew I should have kept that A!

[23tbucket]

Lordmember: I'm sure you will need the 12 volt starter motor when it comes time to first program the Microsquirt ECM. You will make many, many, many starts before you get it right. Just to have the engine start and idle on its own you need:
Required fuel set correctly......
Cranking pulse widths set correctly......
Warm-up enrichment set correctly...
After-start enrichment set correctly...
Volumetric Efficiency table close around the idle manifold pressure

Some of this stuff has to be within .5 milliseconds and in a "true" cold start condition......which means it's going to take a few days.....and a good battery!!!

Then you need to "tune" for the road......again...many, many days!!

Once you get everything set where you are happy..you may be able to kick start to your delight? They do start instanly when the fuel injection is right....and no choky needed...lol

[tweakin]

Amazing work! 

[lordmember1969]

Lordmember: I'm sure you will need the 12 volt starter motor when it comes time to first program the Microsquirt ECM. You will make many, many, many starts before you get it right. Just to have the engine start and idle on its own you need:
Required fuel set correctly......
Cranking pulse widths set correctly......
Warm-up enrichment set correctly...
After-start enrichment set correctly...
Volumetric Efficiency table close around the idle manifold pressure

Some of this stuff has to be within .5 milliseconds and in a "true" cold start condition......which means it's going to take a few days.....and a good battery!!!

Then you need to "tune" for the road......again...many, many days!!

Once you get everything set where you are happy..you may be able to kick start to your delight? They do start instanly when the fuel injection is right....and no choky needed...lol

Thank you and Merry Christmas:)

[luhojs]

Question.. do you think i can go kick only onthe fuel injektion with the mickrosquirt.. Will it work? Or do i have to keep the starter?

I have used a MegaSquirt in the past which is essentialy the same as a microsquirt just different type of electronics. The software in both are the same.
In order for the microsquirt to "know" that you want it to squirt when you are starting the motor it reads the ignition pulses. When it determines that the number of pulses is above a certain treshhold (I don't remember exactly but I think it was 300 rpm) it wil start to squirt.
This was hardcoded at the time, so you cannot switch it off. Well you can but you have to be an assembly and C programmer.
The answer to your question is then: yes you can kickstart providing you can make it go around fast enough.

Better start training them calves !!

[750essess]

you can set the cranking rpm now in the tuning software.. I think kick start with fuel only would be possible. Ignition too, adds problems.

[immortal]

Amazing project!...Keep us posted!

[Tintop]

Just got directed here, now to go to page 1, and read.

[Bankerdanny]

Somebody needs to introduce 23T to Brother Joeyput! Two amazingly original fabricators.

[Tintop]

Having read through your build 23T, the fabrication quality is amazing.  Did wonder how you were going to solve the pressurized throttle body issue.  Looking forward to more updates.

[tomsweb1]

I want to see this piece of art ripping down the road. I traditionally hate choppers, but this is gorgeous.

[23tbucket]

I'm sorry, I haven't been keeping you fellows informed on my progress. After having to do all the big changes to the blower intake...I kind of was disheartened with the whole idea of starting to reprogramme the whole fueling stuff again. But the snow is melting, the geese are back, and it will be soon riding weather again. I've been tuning things for the last two weeks. I had things real, real close. The engine start-up (cranking pulse widths) on cold and hot were dead on. Once the engine goes above the cranking speed (I got mine set at 500rpm) the after start enrichment comes in along with the warm up wizard programme. This was all tuned very nice. I got the VE (Volumetric efficiency) table set real close at idle and up to 2000rpm.
Another few days of tuning and I think the bike would be ready for the open road.

Then I got another huge setback.........I was tuning the VE maps when for no reason the engine just died!!! I thought maybe I ran out of fuel....nope, pressure still at 43psi. Checked all the ignition wiring etc. Started the engine...it's running on only #1 and #4? Rechecked everthing again and restarted the engine. This time only #2 and #3 are firing...WTF? Used an ohm meter to check all the wiring...all is good...? I then took the ignition cover off....I right away could smell the unmistakable odor of burnt electronics!!! I dropped down the Power/Arc ignition stuff and found the encoder had had a meltdown.....dam, dam, dam.

That bubble's not supposed to be there!!!lol


So, now I have to wait for a replacement. I think the failure was due to trying to run four "coil-on-plugs"? However, the folks at Power/Arc had assured me their system would work with what I was trying to do. We'll see!!...Now, whether they warranty things or not...... I'm going to scrap the coil-on-plugs thing. It looked cool, but too hard to troubleshoot and change plugs. I think I had a stronger spark with the coils that came with the Power/Arc kit.

Glad I got three other bikes to ride!!!

[Mantree]

So I didn't see if you had to modify the spacing on the throttle bodys to make it fit the engine