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| Jan Ridders Otto 4 stroke build |
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| saw:
A good one :lol: :lol: :lol: |
| dbvandy:
--- Quote from: DavidA on February 28, 2011, 04:52:51 PM ---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. --- End quote --- Googling " 'sod off "....... :zap: |
| dbvandy:
cogs and belt arrived today... yea... the belt calculator online was dead on! I bought one smaller and one bigger just in case. Tomorrow I strip the engine and cut some slots... Here is a link to the calculator: http://www.sdp-si.com/Cd/default.htm Vapor tank will be a glass tube with socket heads to adjust the mixture and throttle... we will see how well it works... More to come... Doug |
| NickG:
Really interesting to watch Doug with your own take on things. Thanks for the videos - that will be of great benefit to prospective builders. I think some people make their fits way too tight, but a video is worth 1000000 words and that shows the sort of friction people should be aiming for. It does many many revolutions when spun over. :thumbup: On the wrist pin, I usually make it a tight fit in the rod so the pin always stays central with enough clearance so that it never touches the bore - not sure whether it's good practice or not but seems to work. Nick |
| dbvandy:
I cut the slot today and mounted the 192 tooth belt, though I think a 191 would have been PREFECT, it was not offered. I had to bore the holes larger in the cogs to 8mm drill, still do not have an 8mm drill. I drove all over today looking for one. I used a 5/16th and then made a reamer with my chop saw and some 8mm rod. It worked ok. Might make one perfect then harden it for future use. To cut the slot, I had to mount the plate square to a piece of 3/8 x 2 inch aluminum bar so I had something the clamp to with the vise. I plunged the holes to start with, then ran the XY compound vise along the sides to clean them up. Not a perfect setup, but it is what I have and works good for cuts that do not have to be super precise. The finished slot. A bit wider than I wanted to clean it up good, the table moved just a bit between the first and second plunge, but unless you have the plans in front of you and a caliper, you would never know. This is a wide shot of my "mill" setup. I purchased the $89 XY compound vise from Harbor Freight for $13 (had a good coupon) and I have had the 8 in drill press for 15 years. Bounces around a bit, but plunges well, and then side cuts to clean up the edges. I made a locking bolt for the spindle so that I could set depth and lock it in place. The small cog with the spacers to keep the bearings apart. The top cog and belt. I will make the tension idler pulley, top spacers, and cut a slot in the middle support tomorrow. Ordered some lighters last night... we will see... A little video of the progress... still have to set timing, I think I will have the motor run toward me, front of cam going down... I think it looks better. More to come... Doug |
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