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| 90 degree V4 OHC |
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| Rob.Wilson:
Hi Doug :bow: :bow: :bow: :bow: wow having just read this post your sure doing a mighty fine job of designing :smart: and building this engine :dremel: nice one :thumbup: Rob |
| saw:
Your'e engine is coming up just fine :D |
| dbvandy:
--- Quote from: Rob.Wilson on April 10, 2011, 05:03:39 AM ---Hi Doug :bow: :bow: :bow: :bow: wow having just read this post your sure doing a mighty fine job of designing :smart: and building this engine :dremel: nice one :thumbup: Rob --- End quote --- Rob, It's funny that because there are 4 of most things to make, the third one is usually the one that is right... ::) :whip: Doug |
| dbvandy:
--- Quote from: Da_Kengineer_Meister on April 10, 2011, 05:14:06 PM ---Hi Doug. This is looking great, nice progress! Hoping to learn something here, help me to understand the function of the two large square extrusions bolted to the sides of the cylendar heads, connecting them. It is hard to tell in the photo but I would guess it is 1-in square. Is this to align the cylinders during the build and is removed later, or is this part going to be used mount additional items later that have not yet been fabricated? -Just be being curious, hope it is not a bone head question. :doh: Keep up the great work, I am really enjoying this thread, thank you! --- End quote --- The 1/2x1/2 bar stock is part of the design of the intake manifold. I tapped two holes per head for exhaust and intake on each side of the ports just in case I wanted to go with 4 carburetors or a setup that uses separate manifolds per cylinder. Right now they are just there as I sit and stare at the engine designing it in my head. Now that the cylinders are bolted in their final positions, I will start putting some effort into designing the intake manifold. I am leaning toward one centrally located carb with a combination of bar stock and tubing loctited together. I have had some success with aluminum brazing, so that is an option as well. Right now I am stuck on what to do with the crank. It has to be in 3 parts so that I can get the connecting rod bearings on, but I am concerned about making it solid. I think I am going to go with 2 bearings in the center to support the crank... still more mental design to go there. I had to borrow some bolts... ran out of 5/8 inch 6-32's.... After you get that robot finished (in a decade or so :poke:), maybe you can make something that goes putt-putt... :beer: Doug |
| dbvandy:
Looks like we lost a few days worth of posts.... bummer... Well, here is a pic I posted holding the engine to give you a better idea of scale... I have also decided to go with a "half fork" design for the connecting rods. I was thinking about a fork and blade setup, but I really think that this engine is low enough horsepower to be able to pull off the offset connecting rod. This is the fork and blade setup: I purchased some bearings some R4 (1/4x 5/8) for the connecting rod big ends and some R8 (1/2 x 1 1/8) bearings for the crank. I am also going to use 6 bearings on the crank to help support it and keep it aligned, two on each output shafts and two on the center support block. This might be overkill, but It will be solid and not fly apart at 5k RPM. More to come when the bearings arrive... Doug |
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