Topic: Fuel injection conversion progress

[750essess]

Using CBR600F4i throttle bodies. Mocked up new intakes using the two sets of old intakes and cuttin' and splicin' to the injectors. I will use these to make a mold for new ones. I have the microsquirt controller in my possession, still reading the instructions  . I have started to modify the gas tank. Pounded in a place underneath to mount a carter external fuel pump and welded some 1/4 inch pipe thread bungs for feed and return. Should be able to trigger it with either a dyna S or dyna 2000 pickup assembly. I need some help finding some pourable/castable rubber that resists gasoline to make the intakes out of. If anyone could help, it would greatly appreciated. Also need some ideas for a filter assembly. I'm thinking a large oval filter that would cover all the velocity stacks would be best, but am open to other ideas. I dont think there is enough room to make a large enough airbox. I need to plumb the fuel lines, which is becoming trick from the lack of space under the tank and install the oil temp sensor for idle speed control. The air temp sensor, map sensor and wire everything. I think I will just try to run the ignition with the microsquirt first to get a handle on operating it. Heres some cell pics for now, will take some with a proper camera later.

[Bob Wessner]

750,

Interesting project and well beyond my skill level.

I need some help finding some pourable/castable rubber that resists gasoline to make the intakes out of.

Found this. Is this, perhaps, something that would work?

http://news.thomasnet.com/fullstory/464306

[750essess]

Thanks for the link, Silicones usually don't resist gas, this supposedly does. I think a Viton rubber would be perfect but haven't found it for sale as a pourable liquid. The stock ones appear to be molded from radiator type hose probably by heat and dies.

[my78k]

Wow...cool project! Heck even my CBR doesn't have injection (it is a lowly F3!).

Dennis

[Hondell]

Hi;

Back in the day I used a pourable product by Devcon to make manifolds for my dragbike. I think it was called Flexane but can't be sure. Good luck.

[750essess]

Thanks Hondell, I found that also, but it says it has a low tolerance for gasoline. So it worked ok for you? Do you remember if it was Flexane 80 or 94.

[754]

Cool stuff...

GE silicone has always been gasproof for me..

I have been toying with trying  plastic rod and machining to make intake rubbers for my Webers. Ends would be like stock with very short reduced section in the middle..like 1/4 inch or so..   If I can get suitable Material..

[750essess]

I thought about machining them also out of machinable wax, but they are complex curved shapes and would be difficult to machine unless done on a cnc ( I.E. to costly )

[750essess]

Also, anybody getting ready to rewire your bike, I found a fuse block with built in relays from painless wiring that is sweet. I needed some more circuits to run the fuel injection. heres a link
http://store.summitracing.com/partdetail.asp?autofilter=1&part=PRF%2D70217&N=700+115&autoview=sku

[dusterdude]

this is cool

[750essess]

Thanks DD, been kickin' this around for years, but the efi controllers where too expensive until recently. The microsquirt was $400 and it can control the ignition too. It is actually a  reasonable alternative to a dyna 2000 to just run the ignition. Its fully programmable from a laptop.

[Pinhead]

Are you going to run MAP or MAS sensors? Hooking up a TPS? What about an O2 sensor? I've always wanted to inject my bike using a Microsquirt, but haven't had the time. I'll definitely be keeping my eye on this thread!

[750essess]

Map sensor, Tps is already on the 600 tb's. It is basically a GM TBI setup with four throttle bodies instead of 2. Already have a wideband installed in exhaust for setup, will switch it to a narrow band for running.

[Hondell]

Hey 750

The actual tubes were aluminum and I cast the flexane around each end to form the seals for the intakes. I didn't have any problems but it wasn't used on the street.... only 9.54 seconds at a time.

[750essess]

I will have to look into the kz900 setup. Are the ports angled inward on kawi? I wont have to machine the bodies, with the adapters I'm making.

Thanks for getting back to me Hondell, I ordered some of the devcon stuff. I figure it will work good for making some prototypes at least, I'll run some tests on it to see how they hold up. Everthing else I've found so far was pretty pricey.

[750essess]

They make a pretty nasty bend on cyl 2 and 3 dont they. Here is a better pic of the ones I'm making

I wanted to make them shorter, but its not possible with spacing and angle the ports come out at.

[LetoMoto]

hi there , ive successfully installed a Microsquirt system on my CB750. im in the tuning process right now and it feels very nice to run a fuel injected bike but you are gonna run into power problems very fast if you dont upgrade the charging system with a better stator/rotor .

the bike is outputing a max of about 14 amps at like 5k rpm . the gas pump will pull about 4A on itself , ECU and injectors , ignition module and good coils will pull another 5-6 ,  then add headlight wich is about 3 then tails and stuff .... the bike already drains itself when idling with no accessories added to it. i had to install a VFR800 charging system on my SOHC and it was quite a job with the lathe and mill i have here. works fine tho  , i get 14.5V on idle with the EFI running.

youre TBs fitment is looking good , i used 45deg silicone adapters and intercooler T-bolts but theyre pumpin over the vacuum on idle and they will eventually fail. my TBs are from a gsxr750 and they wouldnt fit the CBs booths.... will have to do something about this some day...

as i see you put them upside down , will help the fuel rail clearance , had to modify mine a bit ( flipped it upside down) or the gas intake would hit the frame. ill upload some pics if you want .

what trigger are you using ? i used a Hall effect with a small 36-1 wheel , mounted on the points shaft. tried the Ford VR but the teeth of my wheel were too small , couldnt send a signal strong enough to the controller but the Hall works best for me.

Hit me if you have some questions i will help . this is a great adventure you stepped in but is truly interesting learning experience.

 I would strongly suggest you upgrade your TunerStudio to get the autotune option . Im able to tune the bike with the wideband with a laptop in my backpack. drive around trying to hit lots of tuning cells , stop somewhere then burn the new VE map cells. then keep going around hitting the cells but not going hard little by little , burn changes then go again getting slowly higher in the RPMs . the autotune works for you , this is an insane feature. I will bring my bike to the dyno for the last settings and higher revs but it will get most of the job done and i can ride around.



 

[dragracer]

hi there , ive successfully installed a Microsquirt system on my CB750. im in the tuning process right now and it feels very nice to run a fuel injected bike but you are gonna run into power problems very fast if you dont upgrade the charging system with a better stator/rotor .

the bike is outputing a max of about 14 amps at like 5k rpm . the gas pump will pull about 4A on itself , ECU and injectors , ignition module and good coils will pull another 5-6 ,  then add headlight wich is about 3 then tails and stuff .... the bike already drains itself when idling with no accessories added to it. i had to install a VFR800 charging system on my SOHC and it was quite a job with the lathe and mill i have here. works fine tho  , i get 14.5V on idle with the EFI running.

youre TBs fitment is looking good , i used 45deg silicone adapters and intercooler T-bolts but theyre pumpin over the vacuum on idle and they will eventually fail. my TBs are from a gsxr750 and they wouldnt fit the CBs booths.... will have to do something about this some day...

as i see you put them upside down , will help the fuel rail clearance , had to modify mine a bit ( flipped it upside down) or the gas intake would hit the frame. ill upload some pics if you want .

what trigger are you using ? i used a Hall effect with a small 36-1 wheel , mounted on the points shaft. tried the Ford VR but the teeth of my wheel were too small , couldnt send a signal strong enough to the controller but the Hall works best for me.

Hit me if you have some questions i will help . this is a great adventure you stepped in but is truly interesting learning experience.

 I would strongly suggest you upgrade your TunerStudio to get the autotune option . Im able to tune the bike with the wideband with a laptop in my backpack. drive around trying to hit lots of tuning cells , stop somewhere then burn the new VE map cells. then keep going around hitting the cells but not going hard little by little , burn changes then go again getting slowly higher in the RPMs . the autotune works for you , this is an insane feature. I will bring my bike to the dyno for the last settings and higher revs but it will get most of the job done and i can ride around.



 

Any updates on your project you care to share with us. I'm toying with the idea of injection for a dragbike project.

[SOHC4 Cafe Racer Fan]

hi there , ive successfully installed a Microsquirt system on my CB750. im in the tuning process right now and it feels very nice to run a fuel injected bike but you are gonna run into power problems very fast if you dont upgrade the charging system with a better stator/rotor .

the bike is outputing a max of about 14 amps at like 5k rpm . the gas pump will pull about 4A on itself , ECU and injectors , ignition module and good coils will pull another 5-6 ,  then add headlight wich is about 3 then tails and stuff .... the bike already drains itself when idling with no accessories added to it. i had to install a VFR800 charging system on my SOHC and it was quite a job with the lathe and mill i have here. works fine tho  , i get 14.5V on idle with the EFI running.

youre TBs fitment is looking good , i used 45deg silicone adapters and intercooler T-bolts but theyre pumpin over the vacuum on idle and they will eventually fail. my TBs are from a gsxr750 and they wouldnt fit the CBs booths.... will have to do something about this some day...

as i see you put them upside down , will help the fuel rail clearance , had to modify mine a bit ( flipped it upside down) or the gas intake would hit the frame. ill upload some pics if you want .

what trigger are you using ? i used a Hall effect with a small 36-1 wheel , mounted on the points shaft. tried the Ford VR but the teeth of my wheel were too small , couldnt send a signal strong enough to the controller but the Hall works best for me.

Hit me if you have some questions i will help . this is a great adventure you stepped in but is truly interesting learning experience.

 I would strongly suggest you upgrade your TunerStudio to get the autotune option . Im able to tune the bike with the wideband with a laptop in my backpack. drive around trying to hit lots of tuning cells , stop somewhere then burn the new VE map cells. then keep going around hitting the cells but not going hard little by little , burn changes then go again getting slowly higher in the RPMs . the autotune works for you , this is an insane feature. I will bring my bike to the dyno for the last settings and higher revs but it will get most of the job done and i can ride around.



 

Any updates on your project you care to share with us. I'm toying with the idea of injection for a dragbike project.

You might want to hit up JWebster. He's using EFI on his 750.

[RAZZ]

I asked JWebster a year a go about a turn key EFI he did not Sound like it on its way any time soon - so i got a set of Webers..


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[bochnak]

We cast urethane at work to make proto parts. Give these guys a call and see if they have a urethane suitable for fuel:

https://bjbenterprises.com/

[01Thomas]

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[dragracer]

Any updates on this bike??? Trying to bring this topic alive again to see if anyone else has attempted to install EFI.

[HondaMan]

hi there , ive successfully installed a Microsquirt system on my CB750. im in the tuning process right now and it feels very nice to run a fuel injected bike but you are gonna run into power problems very fast if you dont upgrade the charging system with a better stator/rotor .

This was my first thought, too.
For testing/startup you can disconnect the voltage regulator (unplug the green wire) to let it run 100% all the time, but it probably will not be enough, based on other EFI projects I have seen with the CB750. The Dyna S alone will overtax the alternator on this bike, especially if you use 3-ohm coils: the charging system will not 'break even' with that setup until 5000 RPM with the standard OEM headlight, or 5500 RPM with a typicla 45/55W halgoen headlight bulb in use.