Announcement

Collapse
No announcement yet.

Rockerblock I.C.--Something a little different-

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • That new part is going to add much "techie" to the overall visual ... nice.

    PS: the nuts to hold the manifold fittings are missing from the graphic.

    Comment


    • Norman--I make the model. Then I make the drawings. Then I make the actual part or assembly . Then I go back and add the extra bits to the model and thus the drawings.--You've caught me in between things.--Brian
      Brian Rupnow

      Comment


      • I am constantly amazed by the amount of time required to make some of this stuff. I'm not slow at machining. Its just that there are so many steps and set-ups to make a simple part like this. I've just put in a complete 8 hour day making this lifter guide/bolster. It has turned out fine. I decided to make the rocker arm tower out of a separate piece, which will be bolted on. I will make it tomorrow.---Brian
        Brian Rupnow

        Comment


        • Originally posted by brian Rupnow View Post
          Norman--I make the model. Then I make the drawings. Then I make the actual part or assembly . Then I go back and add the extra bits to the model and thus the drawings.--You've caught me in between things.--Brian
          Hi, understood, it very ok by me. Please accept my apologies. For me; I am impressed by (na I am just following) the solid and steady evolution in your skillset crafting the metal. Was it some great historian (Leonardo or some such) who said I work in a manner where the "vision I see" is within and the man is simply bursting out of the stone I carve.

          Keep at it.

          Comment


          • This picture shows the finished bolster/lifter guide/rocker arm pivot finished and in place on the engine. The two open holes directly below the rocker pivot tower are where the valve lifters set. The camshaft and (as yet unfinished) cams set directly behind those two holes. (See picture without bolster in place.) The open slots on both sides allow me to get a hex wrench in there to lock the cams to the camshaft in the correct rotational aspect. The two open holes in the "cylinder head" are where the valves will be.

            Last edited by brian Rupnow; 05-19-2017, 02:47 PM.
            Brian Rupnow

            Comment


            • This has been a somewhat hither-thither morning. I made and installed two brass valve cages, dealt with a roofing contractor, and helped good wife sort out a ton of stuff in my garage as she prepares for a Parkinsons Charity yard-sale. The diameter of the valve cages are such that they can't be pressed into place with fingers alone, but slide in very smoothly when coated with #638 Loctite and pressed in with my 1 ton arbor press. I have sorted thru my box of springs and found the spring that will keep my valves in the closed position. The slight recess in the top of the valve cages contains the bottom 0.050" of spring so that it can't slide over and rub on the valves when they are installed. The picture showing the inside of the cylinder head shows up a lot of dirt that I didn't even know was there. The Macro setting on my camera sometimes does that. If I'm not interrupted in the next couple of hours, I may even have some valves made today.

              Brian Rupnow

              Comment


              • One valve down, and one to go. Both intake and exhaust are the same. The stem on these valves are almost ridiculously long, at 1.537", but once they are set into place in the cylinder head they look about right. The actual guided part of the valve in the valve cage is quite long. I turn these valves down to about 0.128" in 3 stages to keep from having a lot of deflection to deal with. The hardest part of the entire valve is to keep from turning the stem undersize. The last 0.003" or so, I work down to size (0.125") using 220 grit carborundum paper.
                Brian Rupnow

                Comment


                • And that's the second valve finished. I'd have been done sooner, but I had to run across town to my sons house and look after a sump-pump emergency. Tomorrow I'll machine a set of "keepers" and drill that tiny 0.040" cross hole in the valve stems that allows a cross pin to hold the keepers and springs in place.
                  Brian Rupnow

                  Comment


                  • The time has almost arrived to make my rocker arms. I wasn't totally happy with the original design, as there was no good way to lock the adjusting bolt which sets the valve lash in place. So--this morning a couple of hours were spent redesigning the rockers. I'm happy with what I've came up with. I have to attend a birthday party for youngest grandson at noon, so I may not get any actual machining done today.----Maybe---
                    Brian Rupnow

                    Comment


                    • Looking good, Brian. I am enjoying the build even though I will never likely build one.
                      Glenn Bird

                      Comment


                      • Glenn--I'm glad you are watching and following along. Miniature engines aren't for everyone, but they do call up quite a diverse array of machining techniques and problem solving. I'm having fun with this one, and hope more people are watching and enjoying how this develops.---Brian
                        Brian Rupnow

                        Comment


                        • Those rocker arms look like monsters. They aren't really, they are only a bit less than 2" overall length. I will probably attach two 1/4" plates together and do the side profile, which is where most of the work is, then separate them and do the top profile, thinning them out to 3/16" in the center.
                          Brian Rupnow

                          Comment


                          • Brian, I check this thread at least once a day. Very interesting and a nice job by the way. I sometimes get disappointed when someone calls you away for "real work" and nothing is happening here.
                            My mill is working beautifully now and a DRO is on it's way.
                            Larry - west coast of Canada

                            Comment


                            • Thanks Larry. I'm having fun with this build, and it is coming together nicely. Building an engine like this is a lot like baking a new kind of cake, with a bunch of ingredients that you are familiar with. You know what each ingredient tastes like by itself, and you have a reasonably good idea of how each ingredient reacts with the others, but you don't know whether the cake will taste good until it has been baked. I'm pretty sure this engine will run, but I won't really know for sure until all the components are finished. I should know in another couple of weeks, when I expect to have everything finished and assembled.----Brian
                              Brian Rupnow

                              Comment


                              • YOWZAHHH---we got rocker arms!!! I had forgotten that today was a holiday. I got ready to travel to my office across town this morning and good wife said "where are you going? It's a holiday today."---So, today I machined the rocker arms I redesigned yesterday. There is a lot of work in those rascals. I spent most of today making them.
                                Brian Rupnow

                                Comment

                                Working...
                                X