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- Aug 18, 2008
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Has anyone built and used a vapor (bubble) carburetor based on Jan Ridders designs? If so, can you briefly relate your experience and any operating issues you observed?
Jeff
Jeff
I ran the intake pipe right to the bottom of the tank unlike Jans that only went to the surtace of the fuel.
How many of you guys have been concerned that a backfire on attempted start up may shoot a tongue of flame back the intake pipe into the vapour tank and causing a fiery explosion? Jan Ridders seems very concerned about it and supplys the plans for a ball check valve free with his vapour tank plans. This scared me enough that I built the ball check valve, but I don't know how realistic it is that could happen.---Brian
I don't have a check valve on the four stroke Bonzer, I just rely on the automatic intake valve. But I have noticed small spurts like a submerged whale which (I think) occur while the intake valve is closing but not quite sealed. I have not been able to determine whether or not this back and forth motion of the vapour in the intake system causes any of the problems I have had with the engine.
It is difficult to investigate because a ball check valve would have inertia similar to that of the intake valve and thus would not stop the back flow.
Of course, all of his is happening at the beginning of the compression stroke and is not really relevant to the subject of backfiring.
As a further observation on the use of vapour carburettors, I have tried putting a tube into the intake of the fuel tank and varying the depth of the end of the tube in relation to the surface of the fuel - from way above to fully submerged. And, as Chuck says, it makes no difference. So I still don't know why the fuel level has an effect on engine performance.
Jim
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