[rusEfi] Two stroke Efi (#14)

What engine are you torturing? Is it inside some car?
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Two stroke Efi (#14)

Post by Number-One »

Hello.
This is my project. I´m converting a 50cc sachs engine to 100cc Efi.

Original engine is like that
Image

my itb
Image

fuel pump

Image

my engine converted to liquid cooled

Image

https://svn.code.sf.net/p/rusefi/code/t ... /sachs.cpp

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Re: Two stroke Efi

Post by AndreyB »

The VR board you have asked about is http://www.jbperf.com/dual_VR/v2_1.html

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Re: Two stroke Efi

Post by Number-One »

Thank you.

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Re: Two stroke Efi

Post by kb1gtt »

Nice. Looks like you are going liquid cooled as well. Do you know what pressure you get from that fuel pump? It looks much nicer than what I did for my small engine. Do you know what kind of current it draws? I'd bet it draws less than mine is drawing.
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Re: Two stroke Efi

Post by Number-One »

Hi, pressure i don´t know yeat. In normal utilization arround 300/400 ma. This is original from a Honda cbf125, i think cbr 125 uses similar pump but inside of the tank. Cbf 125 is outside of the tank.

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Re: Two stroke Efi

Post by kb1gtt »

Your probably going to need an external regulator, it doesn't look like that's got a regulator. They seem to sell such items here http://www.ecotrons.com/products/small_ ... ction_kit/
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Re: Two stroke Efi

Post by Number-One »

No, this pump already have a internal regulator.

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Re: Two stroke Efi

Post by skeeters_keeper »

Neat project! I like my air cooled motorcycle (Moto Guzzi Breva) for simplicity.
Some day I may try converting my carb'd '90 Kawasaki Ninja to EFI just because, but for now the carbs are doing a good job.

What is the motivation behind the changes? Or "just because"?

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Re: Two stroke Efi

Post by Number-One »

skeeters_keeper wrote:Neat project! I like my air cooled motorcycle (Moto Guzzi Breva) for simplicity.
Some day I may try converting my carb'd '90 Kawasaki Ninja to EFI just because, but for now the carbs are doing a good job.

What is the motivation behind the changes? Or "just because"?
Only for fun, and to do different. One old bike like a fresh bike. :lol:

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Re: Two stroke Efi

Post by Number-One »

kb1gtt wrote:Nice. Looks like you are going liquid cooled as well. Do you know what pressure you get from that fuel pump? It looks much nicer than what I did for my small engine. Do you know what kind of current it draws? I'd bet it draws less than mine is drawing.

Pressure 250kpa, found this today.

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Re: Two stroke Efi

Post by AndreyB »


Wow!
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Re: Two stroke Efi

Post by kb1gtt »

Nice, looks like it was fun, and very clean. I like the gauge display.
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Re: Two stroke Efi

Post by Number-One »

This white is one of my bikes. This is a Casal, made in Portugal.

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Re: Two stroke Efi

Post by Number-One »

Let´s start close the engine.
New handmade crank stroke 46 (original is 44)
Image

New gearbox , on the left is the original , on the right is the new one (sachs 125),same as Penton, Dkw, Hercules etc

Image

New cilinder, original vs new watercooled (44mm bore vs 54)

Image

News soon
Last edited by Number-One on Sun Nov 02, 2014 9:25 pm, edited 1 time in total.

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Re: Two stroke Efi

Post by rus084 »

this engine look like GY6 ?

what about your hardware?
what is fuel injector you will use?

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Re: Two stroke Efi

Post by Number-One »

No, gy6 is a 4 stroke, my engine is a old 2 stroke sachs.
I will use this itb (Honda cbf 125)

Image

fuel pump
Image
Last edited by Number-One on Sun Nov 02, 2014 9:27 pm, edited 1 time in total.

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Re: Two stroke Efi

Post by rus084 »

you engine was 67cc ?
now its 105cc

new cylinder looks much better, and the scavenging ports quite effective.
yes, quite unlike the cylinder GY6 1P40QMB

you'll make a new cylinder head?
Oxygen sensor to put you?

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Re: Two stroke Efi

Post by Number-One »

rus084 wrote:you engine was 67cc ?
now its 105cc

new cylinder looks much better, and the scavenging ports quite effective.
yes, quite unlike the cylinder GY6 1P40QMB

you'll make a new cylinder head?
Oxygen sensor to put you?
Original 50cc. I will use a yamaha cylinder head. Oxigen sensor i don´t have , i can´t use it once this engine is 2 stroke.

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Re: Two stroke Efi

Post by Number-One »

Ready to fit the engine

Image
Last edited by Number-One on Sun Nov 02, 2014 9:28 pm, edited 1 time in total.

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Re: Two stroke Efi

Post by AndreyB »

My wife was passing by, she saw the pic and sad: "No way you are getting a bike" :)
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Re: Two stroke Efi

Post by Number-One »

Hope she said " oh beautiful bike ".

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Re: Two stroke Efi

Post by AndreyB »

more like "oh beautiful COLOR, but don't you dare think about a bike"
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Re: Two stroke Efi

Post by kb1gtt »

Very nice very nice. You make me want to start the work on my Jawa.
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Re: Two stroke Efi

Post by rus084 »

I have two stoke engine chainsaw "drujba" , but inginion is not working ( i have CDI rotor, but Mount does not fit else contact a woodruff key rotor broke )

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Re: Two stroke Efi

Post by puff »

jawa! my dad had jawa somewhat 30-40 years ago. didn't know they exported it to the us. could you share some pics of it?

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Re: Two stroke Efi

Post by Number-One »

In progress

Engine
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rusefi
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Last edited by Number-One on Sun Nov 02, 2014 9:23 pm, edited 1 time in total.

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Re: Two stroke Efi

Post by Number-One »

Trigger wheel and sensor.

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Re: Two stroke Efi

Post by AndreyB »

Do you have VR circuitry ready? You should be able to spit it by hand and see some LED flashing - if you have an LED :)
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Re: Two stroke Efi

Post by Number-One »

My Frank board isn't ready to test.

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Re: Two stroke Efi

Post by AndreyB »

Number-One wrote:My Frank board isn't ready to test.
You only need ~15 components to test VR input
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