Flat 8 3.0T DOHC VTEC CAD Design

[Domesticated]

Home sick and schools out so I got bored today and started building my dream engine. About 6 hours in and here's what I have done. It won't look so blocky, just trying to get the functionality taken care of before I take all the extra material off.

[apuforyou]

Looks sick man. Wish I knew how to do that kind of stuff

[Domesticated]

So far it's 30" across, 18" deep, and 16" tall at the top of the manifold. Current assembly weighs 173lbs.

[toycar]

Cool approach.

Any better pics of the crank shaft design? Seems like the stroke will have to be minimal to keep the assembly balanced being flat and all. And this would be a quad cam right, not a DOHC? Theres 2 cams/valvetrains per side, so 4 cams and 32 valves right?

I think its pretty cool idea. Im not sure why the "flat" is appealing to you over the v or w, care to elaborate? Doesn't seem very efficient for space, and the angle of the rod would limit the amount of stroke you could have.

I think the size of the cylinder portrayed in the image vs the size of a cylinder that would be required are very different. Actually, theres basically no cylinder in the image.

Lol


Pretty cool art though man. I'd like to see a finished design. Keep it up man

[Jarrett]

What would the harmonics in a flat-8 be? When RUF made the RGT8 they used a V configuration instead of sticking with a flat design so something tells me it's not ideal.

Any better pics of the crank shaft design? Seems like the stroke will have to be minimal to keep the assembly balanced being flat and all. And this would be a quad cam right, not a DOHC? Theres 2 cams/valvetrains per side, so 4 cams and 32 valves right?

It's still a DOHC design. You're referring to the cam orientation per head or bank of cylinders. There are hundreds of cars out there that this applies to.

[toycar]

What would the harmonics in a flat-8 be? When RUF made the RGT8 they used a V configuration instead of sticking with a flat design so something tells me it's not ideal.

I agree, the flat approach with any real stroke at all will be impossible to balance. The least bit of tiny amount of stroke, with higher compression piston and designed for boost, with enough R&R and I think someone could do it.

Without much stroke it would be easier to balance, but it would require forced induction to make any real power at all. Thats what I think anyways.

[Domesticated]

Cool approach.

I think its pretty cool idea. Im not sure why the "flat" is appealing to you over the v or w, care to elaborate? Doesn't seem very efficient for space, and the angle of the rod would limit the amount of stroke you could have.

I think the size of the cylinder portrayed in the image vs the size of a cylinder that would be required are very different. Actually, theres basically no cylinder in the image.

Lol


Pretty cool art though man. I'd like to see a finished design. Keep it up man

A flat engine is very space efficient. The engine is less than a foot and half tall even though I still have an oil pan to make. Porsche and Ferrari used them. Ferrari had a flat 12 5L which had about the cylinder displacement. Subaru only uses them, and they're boosted. And as far as balance, a flat engine is naturally balanced. Equal forces going both directions at the same time.

The cylinder size is also correct. It's a 78mm bore, same as an Yamaha R1 or a Honda D series. The 78mm stroke is also shared with the VW crowd.

In the image you can see the cylinders. The far cylinder is complete and is currently a chunk of aluminum with sleeves. The near side you can two sleeves around the two far pistons.