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Webster IC Engine build log.
dbvandy:
Well done!!!
With my webster if I plug the intake hole the motor dies instantly, but with the Otto it runs on for another 10 seconds before choking out. I don't really know why this is as of yet.
In working with Jan, it seems that the theory is that a mixture of 14 to 1 is best and the vapor carb gives this out a bit on the rich side so the air bypass allows you to adjust this mixture to exactly 14 to 1. I love how the fuel is bouncing around now, that is what it should look like. Taking off the tube will reduce this, but should make the fumes more consistent.
From the video it looks like it is turning about 2000 RPM and that should be commended. Try fiddling with the timing in 2-3 degree increments to see if throttle response improves. Also, the hole in the bypass might not be big enough to lean out the mixture and with the Aspen fuel it might need a ton of air (just a thought)...
Again, very well done! Now you can study it and fine tune it until it is exactly like you want it. Maybe you can make the carb in the drawings????? I never did and even the designer says that he had problems with it, but maybe you can be the one to perfect it!
And also, 3-in-one oil works really well is dripped into the intake valve to lubricate the cylinder (that is what I don on the Otto...)
Doug :coffee:
saw:
Nice work congratulations :clap: :clap: :thumbup:
NickG:
Nice 1 Chris, I will be extremely chuffed if my first i.c. turns out as good as that. :thumbup:
I think it might be worth a try with the butterfly valve still, am sure I've seen one working somewhere. I see what doug is saying about the vacuum, but then again, it's still pulling the same air through per revolution so it should still work I reckon.
It doesn't have to be as complex to make as a butterfly either. It could be something like the attached diagram.
Nick
doubleboost:
Very nice :bow: :bow:
A credit to your determination :thumbup: :thumbup:
metalmad:
nice one mate :clap:
Pete
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