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Hello all, after a long break from this forum I am briefly returning. Unfortunately, I don't think this engine will ever make it to a physical model. Ive been extremely busy with my car, robotics, and have development. If I ever find time in the future, I'll pick up this project again but in the...

Thank you septic. I do agree with what you have advised me to do. I haven't started building it, it's still in the design phase and I do agree that a single cylinder would be a great deal easier. This project unfortunately has been put to the side though because I am working on my car. I hope to...

Well this thread is about camshaft lobe timing and I can say that with the help of the kind individuals on here, I figured it out. So I'm not throwing it completely aside, but I have taken into consideration all of the carburetor and air intake suggestions that everyone has provided and modified...

Hey guys! It's been a long time. Thanks for your support, I figured everything out! Right now it's a twin turbo SOHC mini V8, the ball bearing turbos from turbokeychains.com. (I know it won't create any meaningful boost, but it's just so cool) :D

Thanks, Till! I was wondering how equal distribution of fuel would work without the proper manifold. So, if I have a 7/32" intake port diameter, is that sufficient? I would like it to have a deeper, low idle sound. I figured out the timing for each camshaft, thanks for your help you guys!

Yeah, I see your point! I have already begun designing a single carb intake manifold for my engine that will be 3D printed with the help of a friend of mine. Should I have the inlet of the manifold be centered over the block or can it be towards the front?

And to answer your question, yes I have! It will accept a standard 1/4-32 glow plug. Thanks for the support you guys! I'm learning quite a lot that I did not know about IC engines ;D

Hmm, I guess I never really thought of that. Will it run off a single 2.5cc carb if the engine is 25 cc? (roughly). dman: I agree. Thanks for your input guys! it really helps.

Great, sounds good. Compared to the .625 bore, how large should the valves be? As of now I have them set at .28 (about the diameter of a #5 countersunk flathead machine screw, what I will be using for the valve stem with a few modifications), is this sufficient?

Another question, What would you recommend for lift distance? I'm not sure what is sufficient and what is too much. I'm trying to design the lobe but I don't want to design it wrong so that it may break the valve stems. Thanks for the reply dman! I'll have to look into this more.

Till: Also, I figured that the displacement for each cylinder was roughly 3.1 cc. Is using a carburetor designed for 2.5 - 3cc engines logical for each cylinder of my engine, or would it being a four stroke make it completely different?

I agree, but I may find it more challenging with the resources available to make an effective 8-way split manifold. It's still in the development phase however, so anything can change so I may redo the intake setup. To steve: Thanks! This should help greatly.

Oh, was it? Thank you! I can delete this thread if necessary

Hello! I am new to this forum, and I have a question. I am currently designing a SOHC 16-valve miniature V8 engine that I plan to build after I finish the CAD model. There is one major problem that I am running into, and that is how to position the camshaft lobes for proper timing. As of...