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  1. Brian Rupnow

    Looking for hex wrenches with hardened ends

    I have a tough time with my hex wrenches. The brand I use is generally Bondhus, which have a good reputation. However I find that after about 3 weeks the ends get the corners rounded off and then I have to go out to my industrial belt sander and grind back the ends until I get past the rounded...
  2. Brian Rupnow

    Tabletop CNC

    This morning I'm setting here thinking about tabletop cnc routers capable of machining metal. I have been searching online, and right now I'm suffering from information overload. What has me thinking about such things?--Mainly machining cams for the engines I build. My cams are small, never more...
  3. Brian Rupnow

    Building a twin cylinder inline i.c. engine.

    I have built single, opposed twin, and v-twin engines. I want to build an inline twin engine, and I have the drawings for Malcolm Stride's Bobcat engine. I build in the imperial inch system, and I will be upgrading the Bobcat engine to a 1" bore and using imperial inch measurements as close to...
  4. Brian Rupnow

    Seeking plans for twin cylinder inline i.c. engine

    2023 has not been a great year for me. I have built 3 model engines of my own design, and they don't run at all or not as well as I had hoped. Now I'm looking for a complete set of plans for a two cylinder, inline, four cycle, air-cooled gas engine. Not a diesel, not glow-plug. Plans must be...
  5. Brian Rupnow

    Fabricated Ignition Distributor for 4 cy. model i.c. engine

    This morning I'm looking for a good "how to" article on building a distributor for a model i.c. engine. I have printed out a drawing provided by George Britnel on Aug 16-2023, and it has good information, but I am looking for more. I have tried searching on Google and on the forum, but my...
  6. Brian Rupnow

    Trembler Coils--(Constant spark)

    I am interested in trembler coils, similar to that used in Model T fords. In a conventional points style ignition, you get one spark at the plug when the points open. With a trembler coil system, you get a series of sparks whenever the points are closed. There are a ton of "How to" articles on...
  7. Brian Rupnow

    Compression tester for model i.c. engines

    I'm considering buying a compression tester to use with my model engines, 3/4" or 1" bore. I've been told not to buy a normal automotive compression tester, that it won't work on small engines like I make. Why??? If I have an end that matches my sparkplug threads or even a rubber cone shape tip...
  8. Brian Rupnow

    For Everyone who doesn't have a lathe, a mill, a drill press---i.c. engine

    Okay--I found this while cruising the net. am I impressed?--Oh Yeah!!!!
  9. Brian Rupnow

    Electric Starter System for Model Engines

    This week my lathe has been away being repaired, and I've been trying to think of what my next build will be. I can't finish my current engine until my lathe returns home. I don't feel like designing another engine until I finish the single cylinder vertical that I'm working on, and perhaps the...
  10. Brian Rupnow

    Question regarding hardening of 01 steel

    On the engine I am currently building, I have a situation where a mild steel gear is bolted to an 01 material hub. I want to harden the end of the hub which has a cam machined on it, but see no real necessity for hardening the flanged end of the hub. I haven't done this before, and I'm...
  11. Brian Rupnow

    Vertical 4 cycle engine from recycled parts

    You have probably all seen by now that I tried to build a "cross beam flame licker" engine and failed to get it running. I made two different cams for it, and took advice from several well intentioned people, but it just wasn't going to run. I have spent a happy day at my computer, designing a...
  12. Brian Rupnow

    Horizontal open crankcase engine in "The Home Shop Machinist" magazine

    If anyone is interested, one of my engines complete with pictures and engineering drawings is featured in the September/October edition of "The Home Shop machinist" magazine. They've done a very nice job on the article.---Brian
  13. Brian Rupnow

    My next build--A cross beam vacuum engine

    I just ran across this video today. I like this, hadn't seen one like this before. There is enough info in the video for me to design one from scratch. I've had a bad case of "engine building burnout" this summer, and am still working on my V-twin engine, but when fall comes I think I will...
  14. Brian Rupnow

    1/16" Allen wrenches rounding off corners

    I use a lot of #8 grubscrews on my engines, especially to hold the cams in place on the camshaft. I simply can't keep my 1/16" Allen (hex end) wrenches form rounding off when I tighten these grubscrews. I use "Bondhus" made in USA wrenches. Are there better quality Allen wrenches available, and...
  15. Brian Rupnow

    1/4-32 HELICOIL OR SIMILAR PRODUCT

    I have managed to strip the 1/4-32 threads out of a bronze cylinder head. (For a 1/4-32 sparkplug.)--Does anybody know of a supplier for this size of Helicoil or similar product? I can find lots of 1/4" inserts with coarse and fine threads, but none that are 1/4"-32.----Brian
  16. Brian Rupnow

    O-ring groove depth--Viton ring---another look.

    I have built a number of 1" bore internal combustion engines, using Viton 0-rings. The o-rings I use are 1" o.d. x 0.070" cross section, and I use one ring per cylinder. I use a 0.093" parting off tool and cut the groove 0.056" to 0.058" deep. My reasoning was, that if the o-ring is 0.070" cross...
  17. Brian Rupnow

    Cutting a cam with radiused flanks

    I've been out sick for a month. Very bad back pain and arthritis. Yesterday, I felt like designing something for the first time in a month. I have no CNC in my shop, only manual machines. I know of two ways to make a cam with radiused flanks. Both ways are somewhat tedious, although they do...
  18. Brian Rupnow

    Bought a new shop stool today---

    For the last few years, I have used a wooden stool to set on when I run my lathe or mill. (Damned arthritis). The poor old wooden stool has had it. All of the glue joints have been re-glued numerous times and one of the rungs is missing. Last week I began doing some research on the cost of a new...
  19. Brian Rupnow

    Flywheel Foolishness

    I'm bored today, and that is not a good thing. I haven't built much of anything since Christmas, but I woke up this morning thinking about a flat-head hit and miss engine. I did a web search and found a few flat-head Briggs and Stratton engines that had been modified to be hit and miss engines...
  20. Brian Rupnow

    Flathead hit and miss engine???

    Does anybody have information on a flat head hit and miss engine? I don't think I have ever seen one. Maybe they never existed. I am looking for a different type of i.c. engine to build. I have built many overhead valve hit and miss engines, side shaft hit and miss engines, horizontal engines...
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