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Webster IC Engine build log.
raynerd:
Hi guys...
Stew - cheers. I must admit, the last month or so, I`m feeling much more confident. I still make too many silly errors in my thinking and planning which I follow through to the machine(you know, think of something the wrong way around and then machine the wrong side for example), but my actual machining skills are getting better, parts are looking good and are more accurate. John mentioned much earlier in this thread that I seem to be taking my time more and that is definately true. I still need to take more time in my planning (but with little free time I`m eager to get onto the machines!) but that being said, I am more relaxed in my approach. I`ve always been eager to try and get my engines finished just so I can say they are, but now I seem to have calmed down and happy to take my time. That being said, the last few days I`ve become twitchy in the run-up for the first fireup of this engine!!!
Nick, not sure how it would work vertical. The viewing window shows your tank level and also shows the nice "bubbling" or disturbing of the fuel created by the air intake. Also, I`m guessing here, but I expect these vapour carbs work better with a larger surface area of fuel (more evaporation) ???? and I expect vertical it would reduce the surface area. I`m sure it could be done vertically with some thought!
Doug - got your message too late :( I`ve just come up from the workshop after a few hours of building the one way valve. Damn annoyed to hear I didn`t need it but I read on HMEM that for the Webster engine I would. Your explanation as to why I didn`t need one makes perfect sense as it was my thoughts as well but I just listened to the advice that has been given on HMEM!!
To be honest, looks damn good and certainly looks the part attached to the valve block. I`m very chuffed with it! In fact, so much so, that I`m considering sneeking into the bedroom to get my camera out of my draw, but sha'n't for fear of waking my wife and getting a thump. I`ll post some tomorrow.
Thanks again for your interest and replies.
Bogstandard:
Chris,
As they say, patience is a virtue.
Thinking things thru and taking your time is the first major step in producing good results.
You have a choice, rushing things and still ending up with a lump of junk after a couple of goes at the same thing, or just taking your time and getting it right first time.
I work very slowly and only when I consider it right to work on a specific part. I force myself not to attempt to try to make difficult pieces just because it has to be done. If I feel in a good frame of mind, then I go for the hard stuff, if I don't, then I just make easy bits until I feel I am ready to tackle the difficult parts. I will also put down half finished items if I start to think it is getting a bit too much, and come back to it later.
You are proving not only to us, but to yourself as well, you CAN make great pieces when you put your mind to it. Do that with each part you make, and you will then be in the same league as many of the other people whom you admire for their workmanship.
ONE GOOD PART AT A TIME.
Keep it up.
Bogs
NickG:
Chris, good point about the surface area ... which made me do more thinking! If it does have much bearing on the running, keeping it vertical could be an advantage - the surface area will be constant as the fuel runs down, where as with it on its side it will start off small and peak when half full then diminish again.
Don't know how long the tank is, but if it's 50mm diameter for arguments sake and it looks about 75 long? If that's the case, the max surface area with it horizontal will be 3750mm^2. With it vertical it would be 1963mm^2 but constantly - surely that means less adjustment would be required and it will get a similar fuel / air ratio until the tank is run out?
Having said all of that, I'm not sure how much effect it really has because all the ones I've seen have the tank horizontal and run very well! Something for me to try when I do mine ...
Nice work, getting close now!!
Nick
raynerd:
John, you are correct, it is easy sometimes to get over excited want to try and build the entire engine in an hour. I`m getting there.
Well here are the pics. It all still needs a good polish.
Starting off with finishing the fuel tank. The images previous didn`t include the intake tube insert or the air intake adjuster nut..
Is that enough...or perhaps one more? :lol:
Then I went on to make the little one way ball valve as per Jan Ridders plans:
I`m getting close...I can almost smell the fumes. I`m joking as I know for a fact this won`t run :doh:
Infact, other than an exhaust pipe which I presume I don`t need to test it, I think that is everything other than a mounting block for the sensor!!
Chris
raynerd:
Nick, you made your post while I was posting an update. Yes, it is a good point! I`m not too sure how or if you would put a viewing window in a vertical tank, also the air inlet stream needs to blow down on the fuel to create the vapour. Jans first design was the bubble carb, where the fuel actually bubbled through the fuel. This seems like a really great way to vapourise the fuel so I`m not too sure why he changed it. With this new version, the tank is only filled about half full and the pipe intentially does not go below the fuel level. It is an interesting concept the vapour carb, I just hope it works for me :D
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