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| dbvandy:
Now that I have the Webster complete (http://madmodder.net/index.php?topic=4413.0) and the Otto running (http://madmodder.net/index.php?topic=4425.0), I am looking toward the next project: designing a V4 OHC from the ground up. I have a good grasp of how to build and redesign an engine from others plans from proven designs, but now I want to design and build one of my own. I plan to put the plans out for public consumption once I have it how I want it, but that might be 6 months + out. One problem is that I have limited CAD skills so there will be a little learning curve there, but I am not so worried about that. I have a vision of what I want and will document the process the best I can here. This is what I have so far: I want it to be: completely open design with ball bearings on the crank and cams belt driven and out of bar stock clean, exposed, and compact as possible square 1 inch bore 1 inch stroke fork and blade connecting rod with roller bearings throughout 90 degree V4 CDI ignition single carb (or vapor tank) Should be an interesting journey... More to come... |
| dbvandy:
I have started to layout the V4. Man, this thing is going to be huge! Maybe I will rethink the over head cam thing and go with push rods on a single central cam or two overhead cams with rockers and the cams inboard of the heads... or... a DOHC system on each bank with rockers to push the valves... that would be cool... something to think about... I laid out the cylinders and upright supports. The 2 inch high 12L14 cylinders will be mounted on two 5 inch pieces of 3/8 x 2 6061 flat bar. I sticky taped the cylinders to the bars... Those bars will then be mounted to two house shaped pieces of 3/4 x 3 6061. I taped on some chunks of 6061 round bar that I had laying around to get an idea of the scale with the heads on. The flywheel will be 4'' OD and about 1 1/2 inch thick. About 1'' of the house shaped uprights will be cut off and the engine lowered. I laid out a rough idea of what the heads will look like. This will change of course as the engine develops. There will be 2 bearings on each side of the crank to help keep it steady. They are 6001 28mm x 12mm x 8 mm. Ignition is under development... I am going to go with a CDI system of some sort with a distributor driven off the cam belt. Fuel delivery will be a single carburetor centrally mounted with intake tubes in a riser configuration like a V8 intake manifold. More to come... Doug |
| dbvandy:
This engine is a "design as I go" thing, so there will be multiple changes as it begins to spring to life. I am not trying to come up with a better way of doing things, just what will look cool and be fairly simple to machine. As I sat and looked at it on my coffee table today, I think I might try a DOHC setup with rockers. I do not know if I am going to do 4 separate heads or two heads, one for each bank. decisions decisions... I have a few heads from a Honda gold wing that I might try to emulate. One thing I thought about today was to enclose the crank with Plexiglas and put some oil in it to lube the pistons and crank. The ignition might end up being a singe coil CDI unit with a distributor that will be driven off the cam timing belt. More to come... Doug |
| saw:
I will follow this project with the biggist intresst. :thumbup: |
| ieezitin:
Hey Doug! The pictures of the cylinders and such all duct taped together reminds me of a engine made by Skoda, that was a car made in Russia back in the 70ies and sold in Europe, I owned one for about 7 hours back in 78, and then some crack head stole it while I was in the library returning books. Even though it was irritating I in my mind thanked him for it. I like your style in laying out your project I like to do the same thing it really helps with analyzing what is needed and where problems will occur. All the best on the build. Happy Days. Anthony. |
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