the clean two-stroke thread

**ceci** · 6th October 2021, 19:13

Originally Posted by Muhr

why not an electromagnet like https://m.youtube.com/watch?v=bpA1xwVWJ-M
l

That pumping method reminded me of my youth, when I stole fuel from my father's car, for my motorcycle.
I don't see it as an injection, I see it more as a carburetor with fuel supply control

**ceci** · 6th October 2021, 23:45

Originally Posted by speedpro

If port 25 had CO2 fed to it controlled by an ECU, like they do to wastegates on high performance turbo engines, I can see it working quite well. TZs Arduino controlling a pair of PWM valves, one in and one out, would probably do it.

With this approach you do not need PWM valves, just turn the pump and relocate it, in addition to the passage and control valves.
As you can see now, cavity 13 is not connected by passage 25 but by a direct one from the cylinder and above the exhaust port 11.
Passage 25 is now for supplying control pressure in cavity 14 to control the displacement of plunger 15.
Based on the theory of TZ350, with increasing RPM passage 25 would supply less pressure to cavity 13

Originally Posted by TZ350

If the pipe is not sucking that hard you will have a higher residual pressure left in the crankcase. That explains why at idle and low throttle at low revs the crankcase pressure is higher than when the throttle is wide open and the motor is singing on the pipe. With high crankcase pressure exhaust gas pollution explains why when the throttle is closed the motor slows down to an idle.

At idle the motor is running on a very small amount of fresh air mixed with a lot of pollution that has back flowed from the exhaust. I am not sure if the crankcase is full of pollution or its full of clean mixture and only a small amount is being transferred to a cylinder full of un scavenged pollution, maybe a bit of both so the story is not completely told yet.

**ceci** · 7th October 2021, 20:30

The important thing is not when you inject.
The important thing is how and where it is injected.
The injection would begin when the exhaust port 11 was discovered.
It is injected into the transfer galleries B, creating a scavenger stratified .
Injecting with more pressure creates a better spray

**ceci** · 10th October 2021, 05:07

SORRY, for having done such a desecration by suggesting such a modification of a Yamaha project.
I know I have played with the two magic words that attract your attention "YAMAHA" "TPI" to show you something nonsensical

**Flettner** · 10th October 2021, 18:19

Im just waiting for lockdown to finish so I can go out and do some more riding / tuning, ripping around the back yard is fun but worthless.
Useless Chinese volt meter stopped working almost immediately, should have know better I guess.

**ceci** · 27th November 2021, 08:52

This is "yamaha" Minarelli, but it is not TPI.
Another like Vins, injection to the crankcase.
Along with Athena, Italians are not convinced by the TPI

**TZ350** · 27th November 2021, 12:43

Originally Posted by ceci

This is "yamaha" Minarelli, but it is not TPI. Italians are not convinced by the TPI

Only one injector. I would love to know more about the max power@rpm and torque@rpm.

**ceci** · 28th November 2021, 22:54

Originally Posted by TZ350

Only one injector. I would love to know more about the max power@rpm and torque@rpm.

the same as with carburetor

**TZ350** · 28th November 2021, 23:03

Originally Posted by ceci

the same as with carburetor

Ok, did a Google search but did not really know what I am looking for. Please help me out here and post the specs if you have them.

**ceci** · 29th November 2021, 07:40

Originally Posted by TZ350

Ok, did a Google search but did not really know what I am looking for. Please help me out here and post the specs if you have them.

The first thing is to understand that they intend to sell, they do not want to sell us anti-pollution, they do not want to sell us power either.
What do they want to sell, comfort at a low price.
Convenience: it is not having to have knowledge to be able to regulate the carburetion since it is done by software from your smartphone.
Low price, by using an existing motor and only slightly converting it.
This type of injection is not new, the engineer who created OSSA TRi, proposed it for the GASGAS "trial" and other brands.
He uses the principle of Ockham's razor (the cheapest is the best in equality of operation)

**mradil606** · 20th December 2021, 23:07

2 strokes engines are now almost no use but dirt bikes are still made with this engine, You may check out the best dirt bike helmet under 200 to secure your head during the drive.

**ken seeber** · 21st December 2021, 19:52

Originally Posted by mradil606

2 strokes engines are now almost no use but dirt bikes are still made with this engine, You may check out the best dirt bike helmet under 200 to secure your head during the drive.

What's the go here ?? Could you please explain what you mean re 2 strokes and, IMPORTANTLY, are you advertising helmets? Certainly not appropriate here...

**husaberg** · 21st December 2021, 23:00

Originally Posted by ken seeber

What's the go here ?? Could you please explain what you mean re 2 strokes and, IMPORTANTLY, are you advertising helmets? Certainly not appropriate here...

You need to use smaller words he's from the states a country were nearly 50% of the population voted for a criminal as they thought, who better to stop corruption than a tasteless mob linked con artist.