Cosworth V8 1:12 scale

[HopperParticipant @hopper]

I am totally in awe. Yes, brilliant.

I have a similar-ish gear-driven DOHC V4 Honda motorbike. Ohh but those many and multiple gears make a glorious whine when they get wound up!

Edited By Hopper on 20/02/2022 12:31:02

[Steve CrowParticipant @stevecrow46066]

It's time I resurrected this thread. I've had a couple of months off metalwork but I'm back into it now.

Yesterday, two years to the day from the first idea and drawing, I finally finished making all the major components.

I've completed the task I dreaded most. The valves, guides, tappets and springs – 32 of each.

The valves took the most time as they are rather small with quite tight tolerances. Each one needs 8 machining processes.

Here's 16 of them on a penny.

And a close up of one so you can see the slot.

At this magnification, you can see bits of paste from when I ground them into their seats.

Edited By Steve Crow on 28/05/2022 17:17:15

[Steve CrowParticipant @stevecrow46066]

Here's how the valve parts fit together, open and closed.

The valve guides are brass and reamed with a 1.026mm carbide reamer (Jurassic Tools – great price). They are a friction fit in the cylinder head and the springs keep them seated.

The tappets are adjustable using the 3 holes and the slot in the valve using a tool that I have not finished yet.

Here is a tappet and an untrimmed spring. And a penny.

Steve

[Andy_GParticipant @andy_g]

Jeepers!

Very impressive work.

[Andy_GParticipant @andy_g]

Jeepers!

Very impressive work

[Edit: Duplicate post, but it bears saying twice, anyway.]

Edited By Andy_G on 29/05/2022 09:26:25

[Steve CrowParticipant @stevecrow46066]

Here is one cylinder head with valve gear installed and a cam carrier behind it.

Valves, tappets and springs (and spares) for the other head.

[Ady1Participant @ady1]

Amazing workmanship

Can't wait to see her turning over

[Author]

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