Topic: Fuel injection conversion (edit) fixed a few things

[IronicJ]

Have you looked at the shape of the gsxr fuel pump ? they are not that big, I guess it wouldn't be so hard to make a flange on our tanks to bolt the pump on. Plus, they are cheap, there is one for sale at 20$ on ebay right now. ( 0 bids, 4h remaining ) and there's another one for 50$ ( Buy it now ). Is it that much of a gamble to try it ? I don't think so.

[Retro Rocket]

Is it possible to post the links to those auctions?

Mick

[Laminar]

Searching eBay for "GSXR Fuel Pump" turned up a lot of results.

Auction 1

Auction 2

[lordmember1969]

Hi Just bought one of the Sportster fuel pumps... Will let you know how that works:)

[750essess]

Was reading on the ms forum and saw this pic of a rotor off an 07 kawasaki ex250. The stater clutch looks a heck of alot like the cb750's. Might be easier to adapt this part.

Anybody making any progress on their EFI setups?

[HavocTurbo]

Just to throw another wrench in the mix...

84-85 GPZ750 Turbos used an inline pump. There's a cheap aftermarket replacement for the crappy stock one from the auto parts stores.

Mr gasket I think? I'll have to look for the PN.

Then all you need is a return line bung on your tank and you can use ANY tank you like.

[Retro Rocket]

Just to throw another wrench in the mix...

84-85 GPZ750 Turbos used an inline pump. There's a cheap aftermarket replacement for the crappy stock one from the auto parts stores.

Mr gasket I think? I'll have to look for the PN.

Then all you need is a return line bung on your tank and you can use ANY tank you like.

Thanks Joe and i'm glad to see you active again.....

Mick

[Laminar]

Just to throw another wrench in the mix...

84-85 GPZ750 Turbos used an inline pump. There's a cheap aftermarket replacement for the crappy stock one from the auto parts stores.

Mr gasket I think? I'll have to look for the PN.

Then all you need is a return line bung on your tank and you can use ANY tank you like.

What psi did they run? Current draw?

[lordmember1969]

Was reading on the ms forum and saw this pic of a rotor off an 07 kawasaki ex250. The stater clutch looks a heck of alot like the cb750's. Might be easier to adapt this part.

Anybody making any progress on their EFI setups?

Got the wiring left, just don't seem to get there:( The Harley fuel pump got to big for my tank so i went for a in line fuelpump and adjustable regulator:)

http://forums.sohc4.net/index.php?topic=70333.0

[HavocTurbo]

What psi did they run? Current draw?

I think it was like 3-12 psi .... you got me on draw. I could tell you if I found the part number.

[HavocTurbo]

Ok... it was a walbro pump. More like 25-60 psi.

I forgot that my older pump was for carbs.

Cannot find the PN but it drew 3-3.5amps at full tilt.

You are thinking of using a regulator right?

[dusterdude]

advance auto sells a mr gasket inline pump for carbs,it has about 3-7 psi iirc.

[Laminar]

A pump for carbs will be insufficient for FI. You'll typically want 40+ psi.

[Syscrush]

I would really like to convert my 550, but have a lot of back-and-forth about if it's worth it.  Marking this thread for later voracious reading!

[Laminar]

Don't bother. Electrical system most likely can't handle it and the cost of conversion would probably exceed the value of the bike.

[Syscrush]

Don't bother. Electrical system most likely can't handle it and the cost of conversion would probably exceed the value of the bike.

What I have planned for this bike will far exceed the value of it anyhow. 

My concerns are a combination of the electrical system plus the amount of tinkering/tuning it takes to get a Microsquirt system set up correctly - plus sourcing injectors for a ~40-50hp 4-cylinder may be a problem.

The reason it appeals is because it's a nice differentiator, the parts are not a lot more expensive than a set of CR carbs, it's easier to tune in some ways (although harder in others), and for a bike that will sit for long periods between uses I think it would be less hassle than carbs.

Plus I've been interested in MS for a long time now...

[MasterChief750]

prolly just use a set of oem sport bike injectors. you set the duty cycle in the tuning you would want to find the lowest possible rating. i have a calculator for what you will need somewhere around here. here it is. its all the way at the bottom i put in 45.0psi for fuel pressure. http://www.rceng.com/technical.aspx

[cb550fcafe]

plus sourcing injectors for a ~40-50hp 4-cylinder may be a problem.

The reason it appeals is because it's a nice differentiator, the parts are not a lot more expensive than a set of CR carbs, it's easier to tune in some ways (although harder in others), and for a bike that will sit for long periods between uses I think it would be less hassle than carbs.

Plus I've been interested in MS for a long time now...

I work on Onan generators often. We have a fuel injected model twin cylinder is based on Delphi electronics, they use the new GM mini pico style injectors. The motors make a small amount of HP, the bore is 80mm stroke is 65mm i.e. 653cc displacement. The injectors have a resistance greater than 12.5 ohm. They cost around $40 each. I can get more info if you need.

edit; I also have a GSXR fuel pump taken from an 01 750, I'll donate it if you want to try it.

[dusterdude]

advance auto sells a mr gasket inline pump for carbs,it has about 3-7 psi iirc.

damnit you`re right,i didnt engage my brain before i typed.

[HavocTurbo]

I would think an inline pump would be the easiest way. No major cutting of the stock tank (just weld in a hose bung for the return line) and you can mount it literally anywhere on the bike.

Then with a regulator mounted on the fuel rail (or off) you can change fuel pressure to suit your needs.

A lot of earlier FI bikes had them. Kawi's especially.

[750essess]

The auto inline pumps draw to much power and flow too much. The fuel heats up and boils. The best fuel pump I have found is a Suzuki ltr450 quad fuel pump. It is readily available used and external. I am planning on using switching to this pump this winter istead of the modified internal pump I'm running now.

[Soos]

 
I've said it once, and will say it again.
Thanks for doing the testbed work to prove whether fuel injection will work or not on a cb!!


Seriously tempted to do that on my next big motor.



l8r

[Retro Rocket]

I've said it once, and will say it again.
Thanks for doing the testbed work to prove whether fuel injection will work or not on a cb!!


Seriously tempted to do that on my next big motor.



l8r

I am looking forward to doing this as well, the only problem i can see is i need an already sorted system to run my engine in so i will probably use carbs for the initial run in period then switch to injection.......Lucky i have another engine that needs carbs....

Mick

[750essess]

You guys are welcome, been a fun and frustrating, at times, project. I have a page long list of things to change or refine for the winter such as the wiring harness, its gotten pretty messy from alterations. I still can't say I recommend anyone starting a conversion on an expensive modified engine unless u have the means to repair it if something goes wrong. Get it set up on a junker and then switch it over after.

[J.Webster Designs]

I just scored some 01-03 GSXR 600 throttle bodies for 50 bucks shipped!!!

so what are the fuel pump specs that I am looking for?

What kind of regulator are you running?

My plan right now is to simply get everything running and sorted. I have decided to pull the bike back apart, so once i get the fuel injection sorted on it, I will tear the whole thing apart.

The throttle bodies should show up today or tomorrow!!!

I am excited! can you tell?