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Webster IC Engine build log.
Stilldrillin:
Chris.
Regard the new engine as a little kid. Just bursting with enthusiasm! :D :D :D
Really nice saga, still unfolding....... :clap: :clap: :thumbup:
David D
srm_92000:
Nice one Chris :clap:
I bet your next con-rod will be a bit thicker !!!
I'm just starting a Webster build, made the first chips yesterday. I was planning on putting a butterfly valve of some sort beetween the vapour mixture control and inlet so that the mixture can be left right but the flow controlled, maybe something like that would help yours.
(And it'd help me if it works.... or doesn't ::))
I'm goint to start my log tomorrow (as it's Friday 13th today :zap:).
I'll be calling it a Webster-S cause I just can't help changing stuff.
Steve.
raynerd:
Thanks for your replies guys. I know I came up buzzing with excitement last week when it run for a few seconds but yesterday I really felt I understood what the engines needs to look like to run, if that makes any sense. I started the new Con rod last night and was very impressed with the bush I made for the big side rather than running in bearings like before. I just need to profile the round ends and then it`ll be done!
I obviously dismantled some of it last night so I could replace the con rod and I have to say that I`m really thrilled with the cylinder and piston and how good it just is without an o-ring. It was a little stiff when I put it in at first but it seems much smoother now and with a light skim of oil there is so little friction yet an amazing seal. Whether it wears over time is a possibility but I can always put the o-ring on in future if I feel I need to.
I started the wooden base last night. It`ll sit quite high because the electronics will be in a hollow below it but that way it`ll be nice and compact.
Doug, thanks for checking out my wordpress site. I get quite a few hits on it and am in contact with a few interesting people! It isn`t an example showcase work, just a little diary of the stuff I do.
Steve, I look forward to your build! I`m not really familiar with engines and so I really wouldn`t know how a butterfly valve would work. Could you give me any more details about how this would be made to fit the vapour carb / intake? How exactly does it work, is the air hole on the vapour carb getting a good mix and then is a butterfly valve just another valve further down the line which can add even more air to the mix? I do have the one way valve which I`m not using. The top screws out of there and I`m wondering if I could some how adapt the top piece to incorperate this valve if that is how it works.
Chris
srm_92000:
Chris,
I was thinking of something like Stew has just made (page 14 of his crank wall engine log).
It would be mounted after the mixture valve and before the inlet. It doesn't let in more air, just restricts the flow into the cylinder so the mixture stays about right but the engine is literally throttled and draws in less mix.
IN THEORY :smart:
I have no idea if it would work in practice, it would be best to try something rough to start, say clamping the flexible pipe to the inlet to restrict flow?
Steve.
dbvandy:
--- Quote from: srm_92000 on May 13, 2011, 05:16:01 AM ---
I'm just starting a Webster build, made the first chips yesterday. I was planning on putting a butterfly valve of some sort between the vapour mixture control and inlet so that the mixture can be left right but the flow controlled, maybe something like that would help yours.
(And it'd help me if it works.... or doesn't )
Steve.
--- End quote ---
Steve, I think you will find that having a butterfly valve between the engine and the tank will keep the tank from pulling an adequate vacuum and thus not pull in fumes. The mixture adjustment is more than satisfactory for throttle control, just not what we have been taught about how an engine should be controlled. The vapor carb is very forgiving, but needs to be adjusted as the volatile hydrocarbons burn off. My first incarnation on the Webster (http://madmodder.net/index.php?topic=4413.0) vapor carb works flawlessly and you can adjust the "throttle" from 500 rpm all the way to 5400 RPM (though I don't recommend it due to what you saw on Chris's engine...) just by adjusting the mixture. These engines are not designed to be and cannot be run for more than 20-30 minutes straight without a cool down period, so the vapor tank is perfect.
I believe my design of the vapor tank that I used on the Otto (http://madmodder.net/index.php?topic=4425.0) is about as good and easy as it gets. The Otto starts on the first pull every time even after the fuel has been sitting in the tank for weeks.
But, all that being said, the nice thing about building your own engine is that you can do whatever you want, and it it works... great... and if it does not... you can try something else.
I look forward to seeing your take on the Webster. Take tons of pics and videos and post frequently......
Doug
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