Fuel injection.

I'm working on a fuel injection system for my 850 Commando.
The circuit board, small as a cell phone, is finished and the general mapping has been sketched out.
I suppose it will take me a year or so to get it sorted out and bug free.
The program is based on PYTHON, the architecture is borrowed from video and game boards. And a flash of insight I stumbled upon by chance.
The idea is to have 4 operator selectable parameters, 1; carb feel. 2; city. 3; cruse. 4; thrash it. The rider will be able to press an appropriate button to select the mode.
The whole gestalt will be a simple bolt on kit type of thing. But it will mean that sensors will have to be welded to the exhausts and the head tapped for a sensor there. All parts should be simple off the shelf items. However this may all change as the prototype reveals issues, or not as the case may be.
The rider will be able to change the parameters with a lap top or smart phone. Basically you just need to know how to control "F" curves and you are ready to go.
Because of the parametric feature the unit will able to be recalibrated to accept any engine modifications.
Not telling about the electrickery. Have to sort out intellectual property rights etc.
All I need now is a big pile of spare cash to move this along.
Will put up a photo of the board soon as I get it registered.

Very neat thing to put your talents too. I've sort of in market for this if it can fit in thin space like other flat slide fuel injectors. Powerarc makes a four programmed time curves in one unit that manual or sensor selected plus has out puts to trigger other stuff. Cell phone often don't work out here but I'd get one for this fueling feature. I"ve done the simple add on TBI for chevy V8 and got dramatic increase in response and performance over the 4 bbl dual accelerator pumper Holley carb.
In back of my mind is running on propane EFI.

I guess you have not been here long enough to see that Jim here has a working fuel injection, and has for some while.
Talk of it being available for sale 'sometime soon now', but that seems not to have happened.

Interested to hear what you find though.

Someone near me has had injection on an old yamaha for decades now, he loves it.
Knobs to twiddle while he rides along (?!!!?).
But thats yamaha riders for ya...

Hurry it up will ya ? Once you taste fuel injection there's no lookin' back.

Comstock's is sold through CNW and cost at least $2500, so there's room for less expensive versions. Its been online about 3 yr.

Good luck on this project, but why do it. The engine design is from 1948. Don't see many trying to put electronic fuel injection on a '48 Ford flat head V8. The elegance is in an analog world.

Yeah, do you really want to install sensors into the exhaust?

I guess someone has to do it. It'll be interesting to see.

Dave
69S

EFI brains use wide band O2 bung welded in a header or a bit past where a 2>1 joins. Knock sensor is a type of microphone of ring type under a bolt or a bolt type threaded in. Also need a throttle position sendor and hi pressure fuel pump and maybe a return line to tank. Royal Enfleid of India offers EFI in their big twins, might be worth investigating how they do it and snag their brain box?

Get em going too quick and the handling quirks limit you but the drags are fun too.

Is python able to time slice in fine enough increments for EFI, or is it just talking to some underlying dedicated controller?

A friend recently installed a fuel injection kit made for old carburated American V8 engines. It does not inject directly into the cylinder head, instead it injects into the intake manifold. A sensor in the exhaust tells it how to alter the ratio with rpm and loading. The motor is an early seventies 500 cubic inch Caddy engine stuck in a 53 Ford pickup.
It went well before, now the acceleration is brutal! And the engine just runs better, smoother thru the range and idles perfectly.
The kit can be set for any number of cylinders between 2 and 16. The fellow who installed it feels it would work well on a 2 cylinder motorcycle. Cost is about 2 grand tho. Bet it will come down over time.

Glen

http://www.ecotrons.com/

These guys already make a unit that we could use on our Nortons!!!

Thanx for the input you guy's.
As I said, I am doing it for my 850.
I'm doing it partly just for the challenge and partly to avoid carburettor problems.
I know what is involved.
If it all works out I may well offer it at a price to cover costs and a bit of vig.
Lots of work to do yet. Just got excited and had to open my yap.
I'm not trying to set the world on fire or offering a one way trip to Mars.
Just doing the Burt Monro thing, ie; having a go to see if I can do it.
To reiterate: Not saying about the electrickery.

Throber said:

I'm doing it partly just for the challenge and partly to avoid carburettor problems.

Click to expand...

Full ACK on this.

One hint, I don't know whether you have this on the screen already: The std sensors of modern ECUs usually have a relatively high lower threshold so the problem will be kick starting the bugger as cam- and crankshaft don't reach sufficient speeds. Once the speed is high enough all works find but this is a big issue.

Jim has his own solution for this but I prefer leaving it to him to explain this.

Good luck with this project!


Tim

Electric start will have no problems.

Most EFI need between 2 and 5 complete revolutions to synch and fire.

This factor will govern what system can be used on Kick starts

Good luck.

[This factor will govern what system can be used on Kick starts]

In my opinion it is easy to achieve this. Prepare a function / program that injects an adjustable (via mobile or PC) amount of fuel by activating a push button. By pressing a certain number of times according to the temperature, the engine start without using the sensor signal. After some trial and error will work fine I think.

Good luck, cheering for you!

Fuel injection with a tickler button, Amal will be proud

Yes, keep it simpel. And you have't gas om your finger!

Nortiboy said:

Electric start will have no problems.

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It entirely depends on the individual setup, been there - done that - no shirt. I once went almost mad when we tried to put EFI on a 600cc Jap four for a Formula SAE car. We tried to go for sequential immediately but the cam sensor did not reach the critical voltage threshold required. Once we went to crank-only batch ignition the engine fired at first try. Years later we had the same problem on a V10 LFA race car where the original sensor did not fit the requirements of the bespoke ECU.



Tim

I'm a bit embarrassed by the support from you guy's on this issue.
Overwhelmed actually.
I will take into consideration all the sage advice you have given me.
Any suggestions will be considered.
I have a solution for the kick start dilemma.
Now I will have to get it happening quick fecking time.
Thanx so much.

I have a solution for the kick start dilemma.

Click to expand...

you've let no pm tag so pray tell what you mean by this. The ignition system is often used to trigger aftermarket EFI as does Jim's EFI. Some systems require a water temp signal and that temp range can be gotten by sensor near the intakes which varies in similar range and reasons.

Would like to know the ping sound rang of detonation in our heads to select a knock sensor that more attuned to it. There are methods to calculate but measure would be better.