18cc V8

[Pixie]

http://www.moyermade.com/chevyV8.html

[AllanB]

Most impressive. A seven year project!

One question I have on these scale engines - the original full size donk revs to maybe 6,000, but the scale ones always seem to rev a lot higher. Anyone reason why as the bore/stroke etc are set in prefect scale so why don't the engines have the same limits?

[Pixie]

Most impressive. A seven year project!

One question I have on these scale engines - the original full size donk revs to maybe 6,000, but the scale ones always seem to rev a lot higher. Anyone reason why as the bore/stroke etc are set in prefect scale so why don't the engines have the same limits?

Reducing the scale of a mechanical system drastically alters some of the forces operating on the system.

An example is the behaviour of air around a beating insect wing - at that scale the air behaves more like treacle than a gas.

[cs363]

Impressive work, though personally I'd be a bit dissapointed that it sounds like a sick chainsaw - these guys seem to have got that aspect a bit better sorted:

http://www.nvbackflow.com/inprogress/V-8.mpg

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[xwhatsit]

I've been looking at these on Youtube recently. What really impresses me is the aero engines --- this is a 14-cylinder double-row radial:

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The tiny little V8s and V12s... someone needs to make one about 50cc then mount it in an SS50 frame and register it as a moped :D

[cs363]

I've been looking at these on Youtube recently. What really impresses me is the aero engines
The tiny little V8s and V12s... someone needs to make one about 50cc then mount it in an SS50 frame and register it as a moped :D

Yeah, it's amazing how many of these wee beasties are out there - I've been noticing quite a few of these popping up of late as well. Did you see the guy that hand built an entire Ferrari 512 in scale -all working, it was on Top Gear a while back:

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20,000 hours....... farkin ell... :blink:

[Big Dave]

It's a Pixie thing yeah? :-)

[smoky]

Imagine if these clever bastards actually put the same effort into something useful

[peasea]

Impressive work, though personally I'd be a bit dissapointed that it sounds like a sick chainsaw - these guys seem to have got that aspect a bit better sorted:

http://www.nvbackflow.com/inprogress/V-8.mpg

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I think nitromethane and a blower might have something to do with it.

[Laxi]

Imagine if these clever bastards actually put the same effort into something useful

you mean like a 50cc busa?:rofl:

[EJK]

If it's 1/6th Scale of a 365hp engine... Should it output 60.83 hp? That's alot!

[JMemonic]

That Ferrari is amazing, seems to be some folks passion to build these things, gotta say though the radial does it for me.

[EJK]

There was also a web site about a handbuilt home made Lamborghini Countach?

http://jalopnik.com/5065896/hand+made-lamborghini-built-in-basement-finally-sees-light-of-day

http://jalopnik.com/assets/images/gallery/12/2008/10/medium_2958752756_ce32b13172_o.jpg


Some insane, talented and commited people out there.

[Bass]

Most impressive. A seven year project!

One question I have on these scale engines - the original full size donk revs to maybe 6,000, but the scale ones always seem to rev a lot higher. Anyone reason why as the bore/stroke etc are set in prefect scale so why don't the engines have the same limits?
They actually have very similar limits but they are in terms of piston speed and more importantly piston acceleration which is mostly what determines the component stress levels.
As the size drops, so does the acceleration and so for the same stress levels, the revs can go up.

[slofox]

That Ferrari is amazing, seems to be some folks passion to build these things, gotta say though the radial does it for me.

Me too...although I love that V12 as well...

[Mikkel]

If it's 1/6th Scale of a 365hp engine... Should it output 60.83 hp? That's alot!

1:6 scale - in which regard? If, as is the custom, you mean length scale - then volume will be 1/216 compared to 1:1 (1/(6^3)).

[one fast tl1ooo]

nice little motor :woohoo:

[idleidolidyll]

Most impressive. A seven year project!

One question I have on these scale engines - the original full size donk revs to maybe 6,000, but the scale ones always seem to rev a lot higher. Anyone reason why as the bore/stroke etc are set in prefect scale so why don't the engines have the same limits?

Regardless of whether or not it is to scale, an engine with a shorter stroke will almost always be able to rev higher as the piston speed is less in the bore (as long as quality materials are used in both examples).
Piston speed, not revs, is usually the limiting factor as this determines when the components will fail; usually the piston itself or the rings.

No, higher revs may not mean higher piston speed if the stroke is shorteer.

Better metallurgy has helped but there is still an upper limit.

[cs363]

I think nitromethane and a blower might have something to do with it.


Well, if that's what it takes..... :lol:

:beer:

[Ronin]

I've been looking at these on Youtube recently. What really impresses me is the aero engines --- this is a 14-cylinder double-row radial:

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The tiny little V8s and V12s... someone needs to make one about 50cc then mount it in an SS50 frame and register it as a moped :D

'Tis a radial you be wanting then?

Mad German ahoy... Not all a slide show.

1TIdQFnUvCA

[cs363]

'Tis a radial you be wanting then?

Mad German ahoy... Not all a slide show.


Fark!!! Insanity has a new home....in Germany!

(again....)