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Hi Guys,
I´m Max, 19 years old, and a 2 stroke small engine enthusiast.
I´ve built several small single and twin cylinder reed case engines for RC Cars.
Here are some pics of the twin cylinder reed case. It has 57cc with 2x 36mm bore x 28mm stroke.
And it works fantastic.
Here is a video
https://www.youtube.com/watch?v=OyyjH-jTLXY
Here is my newest project, that i have some questions about.
It is using two 32mm bore cylinders with 28mm stroke to make a 45cc twin, having only a single carburator.
The Reed blocks are built-in to make sealing the crankcases easier.
Carburetion is the part where i scratch my head.
In those small cc engines, we normally use "pumper" diaphragm style carburetors, as the fuel tank sits below the carb. I can´t use those in that situation because the diaphragm can only be connected to one crankcase.
So, while one cylinder sucks the mixture that was just enrichened by the fuel that the crankcase pressure just pumped into the carb, the second cylinder will run the carb empty because the first cylinder has already drawn all the gasoline out.
I think it has to be a float bowl carburetor as those dont have an internal fuel pump.
I was thinking of delivering the fuel either by an electronic fuel pump or by pressurizing the gas tank using the pipes.
Has anyone got any experience with a twin cylinder engine running on a single carb?
I was hoping, by using a slide throttle carb the fuel supply would be very steady, and with both cylinders sucking air through the carb, the airflow would be very steady, helping with fuel atomisation and preventing double rich mixtures.
Thanks,
Max
I´m Max, 19 years old, and a 2 stroke small engine enthusiast.
I´ve built several small single and twin cylinder reed case engines for RC Cars.
Here are some pics of the twin cylinder reed case. It has 57cc with 2x 36mm bore x 28mm stroke.








And it works fantastic.
Here is a video
https://www.youtube.com/watch?v=OyyjH-jTLXY
Here is my newest project, that i have some questions about.



It is using two 32mm bore cylinders with 28mm stroke to make a 45cc twin, having only a single carburator.




The Reed blocks are built-in to make sealing the crankcases easier.
Carburetion is the part where i scratch my head.
In those small cc engines, we normally use "pumper" diaphragm style carburetors, as the fuel tank sits below the carb. I can´t use those in that situation because the diaphragm can only be connected to one crankcase.
So, while one cylinder sucks the mixture that was just enrichened by the fuel that the crankcase pressure just pumped into the carb, the second cylinder will run the carb empty because the first cylinder has already drawn all the gasoline out.
I think it has to be a float bowl carburetor as those dont have an internal fuel pump.
I was thinking of delivering the fuel either by an electronic fuel pump or by pressurizing the gas tank using the pipes.
Has anyone got any experience with a twin cylinder engine running on a single carb?
I was hoping, by using a slide throttle carb the fuel supply would be very steady, and with both cylinders sucking air through the carb, the airflow would be very steady, helping with fuel atomisation and preventing double rich mixtures.
Thanks,
Max