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| Jan Ridders Otto 4 stroke build |
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| madjackghengis:
--- Quote from: dbvandy on February 28, 2011, 12:07:10 AM ---I'm running out of things to do without belts and ignition parts. Belt and cogs will be here tomorrow... I hope I got the right size... I redesigned the muffler. It looked like it might be a bit fragile and exposed and easily damaged or knocked off. Not that I am going to be tossing the motor around, but things happen, so I made it with a mount that bolts to the tappet cross member. It is high temp loctited together. The intake was the same idea. I will connect the nipple to the vapor tank with some silicone hose or some aluminum tubing. And a view of it on the motor. Starting to look pretty complete now. More to come... not much more, but more just the same... --- End quote --- Doug, it takes a lot of gall to say you're not going to toss it around or anything, when you just posted a video of you tossing it around and everything :poke: :lol: I guess my thoughts on using four bolts for the bottom of the cylinder would be another problem too. That is a very nice connecting rod, and you are definitely making it "your own", by the unique modifications from the design, I'm really looking forward to seeing and hearing it run. :beer: cheers, Jack |
| DavidA:
Doug, You should have an email with a copy of my pdf. If not let me know and I'll do a screen dump of the relevant section. I note that my version is dated October 2007. You may have an updated set. I echo the 'nice build' comments of the others. I made a cylinder barrel and roughed out the head months ago before I retired from work, whilst I still had access to big machines. Haven't done anything else on it yet. The only thing that does raise an eyebrow is that you have a brass piston pin running in a brass small end bush. Don't know if that will last very long. One way to get around the problem of the steel pin scoring the bore is to shorten the pin a bit and fit some small brass 'end pieces' that will prevent the pin touching the bore. Just an idea. Dave. |
| dbvandy:
--- Quote from: DavidA on February 28, 2011, 09:40:17 AM ---Doug, You should have an email with a copy of my pdf. If not let me know and I'll do a screen dump of the relevant section. I note that my version is dated October 2007. You may have an updated set. I echo the 'nice build' comments of the others. I made a cylinder barrel and roughed out the head months ago before I retired from work, whilst I still had access to big machines. Haven't done anything else on it yet. The only thing that does raise an eyebrow is that you have a brass piston pin running in a brass small end bush. Don't know if that will last very long. One way to get around the problem of the steel pin scoring the bore is to shorten the pin a bit and fit some small brass 'end pieces' that will prevent the pin touching the bore. Just an idea. Dave. --- End quote --- Wow! these plans are great! There is just something about hand drawn plans that feel right. He also includes the info about the piezo igniter, I am still on the fence on where to go there. The CDI is looking better and better, but the piezo is really clean looking. On the brass wrist pin: I had a stainless wrist pin in the webster and it was starting to mar the cylinder, so I did some research and the jury is about 50/50 on the use of brass on brass. Being as this is not a high HP or RPM engine, it will probably be fine. The new one in the webster (brass on brass) has about 20 hours on it and it looks about brand new. I have some old school IC engine books that talk about that same thing: using steel rod with brass buttons on the end. Being as it looks like I have some time before it runs (not that I am on any deadline anyway...) I think I might go ahead and make one up and use it. You should pull that cylinder off the shelf and see if it speaks to you.... Doug |
| sorveltaja:
Brass is good, and some small commercial 2-stroke glow engines, like Thunder Tiger, used to have ptfe wrist pins. Maybe they still do. That piezo ignition is a very interesting, and compact alternative. But as Jan has stated, it works reliably only on his 4-stroke engines, but not on 2-strokes. I guess, that the speed limitation isn't in the piezo itself, but in the mechanism, that drives that piezo. All of the local market/grocery store barbique grill/gas stove igniters, that I've had, have exactly same size piezo unit in them. Could make them easy to replace. |
| DavidA:
Doug, ...You should pull that cylinder off the shelf and see if it speaks to you.... I did; it said 'sod off, can't you see I'm asleep?' Dave. |
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