Speeduino 2T EFI Project

[ceci]

As always my impatience defeats me, it is already clear if it is,

[TZ350]

.
(Single?) Fuel Injector. It would be interesting to know more.

[ceci]

.
(Single?) Fuel Injector. It would be interesting to know more.

I can't find information about this engine, but I have a theory, but I can't find a relationship between my theory and the engine.
I suspect it is the design of Marconi Pierluigi who is the designer of the Bimota Vdue, this is the patent, the location of the injector is the same.

https://patentimages.storage.googlea...93022545A1.pdf

In this engine it is between that patent and the GasGas patent also from the same engineer. Which makes it also a combined injection

[ceci]

The engineer will not be the one I suspect, but the type of injection is combined

[TZ350]

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It will be interesting to know which port is used for slow running and which for full noise up on the pipe.

[ceci]

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It will be interesting to know which port is used for slow running and which for full noise up on the pipe.

I am not sure that it is from that engineer.
In the Spanish patent the main injection is in the cylinder.
The one in the carburettor body is like a powerjet

[TZ350]

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Does the cylinder injector squirt only under the piston like mine does. Or both above and below?

The injector in the throttle body for main fuel at higher power when the engine is on the pipe makes sense.



I squirt my small low speed injector under the piston for best mixture homogenization at low throttle opening. The big injectors for power are in the B ports.

[husaberg]

the Bimota system injects direct to the bore

plenty of pics here
https://www.kiwibiker.co.nz/forums/a...p?albumid=5064

[Flettner]

Interesting isnt it. All this complication just to try to avoid fuel / air spilling out the exhaust port.
Uniflow, throw the exhaust down the other end of the cylinder, and it all becomes so much easier to control.
I would bet it would be easier to have a clean exhaust with a carburetor Uniflow than with an injected loop scavenge twostroke.
Add some injection control to Uniflow, there is your answer. 😆😆

[Drew]

Forced induction, direct injection.

The problem is quite easily solved.

[ceci]

Forced induction, direct injection.

The problem is quite easily solved.

And why don't they market it

[Drew]

And why don't they market it

Never heard a train go by?

[sidecar bob]

Never heard a train go by?

Detroit 53 cu in per cylinder two stroke diesel engine went into production in 1957.
https://www.dieselhub.com/specs/detr...ke-diesel.html
Never understood why the same concept never evolved as a spark ignition petrol engine.

[husaberg]

Detroit 53 cu in per cylinder two stroke diesel engine went into production in 1957.
https://www.dieselhub.com/specs/detr...ke-diesel.html
Never understood why the same concept never evolved as a spark ignition petrol engine.

https://www.dieselhub.com/specs/detr...ke-diesel.html
http://usautoindustryworldwartwo.com...20to%20win.htm
Detroits were in production in ww2 twins in shermans, quads in landing craft but there is a reason you and drew seemed to have overlooked in why they have fallen out of favour despite their ruggedness, simplicity, power denisity and their cool noise.
they could not meet modern emissions

it looks like there was a methanol version was trialed though

https://www.sae.org/publications/tec...ontent/831744/

[Flettner]

Simplicity? Valves, x4 per cylinder camshafts and a super charger.

Poppet valves are rubbish anyway, piston opening a port is far superior.

https://youtu.be/BPr694nlUKE

No poppet valves, no heads, no supercharger, no camshafts.
just simplicity, and uniflow.