Build Your Own V8

[Alastor187]

From: http://www.metalbashatorium.com/V8%20engine.htm

Specification 1/2" bore, 3/4" stroke approx 1/6 scale. Length 5 5/8", width 6 5/8", height 7 7/8" over air cleaner, 6 1/8" under bonnet. Capacity 19.31cc - 1.178cu" Idles around 800RPM.

You'll need access to a lathe and mill. Everything else is done with ordinary hand tools. Drawing set includes plans for simple jigs and tools to make the job straight forward for the average hobbyist.

This engine is designed for the beginner, and email support is available to all registered builders.

Plans cost: $40.00Au

Stock V8 develops 2.1hp @ 4100RPM

[RandomTask]

Just to point out, you do know those aren't real running engines. In relation to the scale, firstly, the HP would be at an extremely higher RPM. Remember, since HP is in distance traveled its a product of piston speed. Going from a 3.5"/4" stroke to a tiny stroke like that, drastically reduces piston speed and as such, you have to increase your RPM to compensate the HP.
Also, do they even make spark plugs that small, even better, carbs thats small!?

I could keep nit picking further, but sorry... im a nerd.... :P

[Alastor187]

Originally Posted by RandomTask

Just to point out, you do know those aren't real running engines. In relation to the scale, firstly, the HP would be at an extremely higher RPM. Remember, since HP is in distance traveled its a product of piston speed. Going from a 3.5"/4" stroke to a tiny stroke like that, drastically reduces piston speed and as such, you have to increase your RPM to compensate the HP.
Also, do they even make spark plugs that small, even better, carbs thats small!?

I could keep nit picking further, but sorry... im a nerd.... :P

Yea I was trying to figure out how it would actual work and didnt make sense. Think it would possible as a 2-stroke?

[bjdm151]

Sure it works!

I have one in my, i don't know i can't think of anything truly amusing enough today.

[curtis73]

I don't see why it couldn't produce 2.1 hp. I've seen some 20 cc large model airplane motors make well over 14 hp at 20,000 rpms. I think 2 is possible at 4000. Unlikely, but possible.

That's probably also their source for carbs... model hobbies

[Alastor187]

Originally Posted by bjdm151

Sure it works!

I have one in my, i don't know i can't think of anything truly amusing enough today.

So its a functional 4 stroke motor? Does it have valves and cam shafts?

[RandomTask]

The designs are done in jpg! THATS Microsoft PAINT! They just dont seem real to me. I just can't understand why it would make its peak HP at 4k rpm. For the minute size of the cams and heads. ALSO! If you notice on one the pictures of the motors, theres one with the cam looking thing on top of rocker looking things, you'll notice, there is NOTHING driving the cam... Its just freefloating/pivoting... I just can't see it being a four stroke... So then if its a two stroke, back to my first question, 2.1hp at 4k rpm? Just way to low... But I did think of that about the carbs curtis, but right after my post... to lazy to edit it though... :P

So who wants to be the first person to drop $40 and find out if its real or not?

[CBFryman]

i have 20 and am taking donations....lmao

[bjdm151]

Its in my beard trimmer, thats what it is. It is a little bit noisy and gets some oil on the face, but the ladies love that nice smooth skin. I am also planning on attaching one to a vibrator. Wow this is going downhil quick.

[public]

I would have machined the outer surfaces to make it look better. As a long time hobbiest model builder it looks bad. I have a small end mill and I always want my work to look good.