Demon V8

raveney · Dec 22, 2022

Michael, Awesome work and thank you for posting the setups and details.

Have you considered using a dab of lapping compound to deburr the gear set?

I made a full set for this engine out of brass and they held up okay. I had to pin the bevel gear to the distributor shaft though, as the tiny set screw would slip while running even with Loctite. My water pump gears didn't come out too well.

Cheers!

michael-au · Dec 22, 2022

raveney said:
Michael, Awesome work and thank you for posting the setups and details.

Have you considered using a dab of lapping compound to deburr the gear set?

I made a full set for this engine out of brass and they held up okay. I had to pin the bevel gear to the distributor shaft though, as the tiny set screw would slip while running even with Loctite. My water pump gears didn't come out too well.

Cheers!

HI raveney
I did think of putting some past on the gears and see if it smooths them out, they don't need much

I'm thinking there is something like 1/2º of backlash in my 4th axis, its never shown up in anything else I have done in the 4th but gears might be a bit different
I Like your Demon the bell housing looks good too with the extra ribs on it

michael-au · Apr 19, 2023

Taking a break from the V8 and working on a Single Cylinder for a while

Build log here: Thompson Engine

michael-au · Sep 19, 2023

Slowly getting back to the Demon V8
made a start on the block, first I squared up the block of aluminium, then machined it to the correct size

Next was to drill the 1/8” holes that pass through to the Water jackets around the cylinders,
these holes have to be drilled from both sides because the drill is not long enough to reach all the way through
I first used a normal length drill, drilling all the way to the length of the flutes, the swapping to the longer drill
Using the shorter drill first gives a nice long pilot hole for the longer drill to follo the block was the flipped over and drilled to join up with the other holes
Drilling the second side only required the short drill

michael-au · Oct 20, 2023

Started to machine the block, drilling the holes for the bores and cam followers, for the left and right banks

michael-au · Oct 20, 2023

Machining the top of the block

Milling the bottom of the block

michael-au · Oct 20, 2023

Machining stock to the profile shape of the inlet manifold

Drilling holes for the inlet channels

Setting the vice to 5deg to drill the cross holes

Steamchick · Oct 20, 2023

Massive amounts of swarf produced! Great stuff!
Keep it up!
K2

Eccentric · Oct 21, 2023

Awesome, thanks for all of the great pics. I feel I am right there in the shop.

michael-au · Apr 25, 2024

Progress on the Demon has been a bit slow, I have been working on a 3 cylinder radial as well, I will put a build log up about the radial soon

This is a few of the parts I have made for the radial

michael-au · Nov 25, 2024

Finally back to the Demon
Made a new air cleaner for the twin carb setup

michael-au · Nov 25, 2024

Finished the Bell housing

michael-au · Nov 25, 2024

One of the most stressful parts is complete, the crankshaft

After cutting each journal I placed a disc of aluminium in the slot to stop the shaft from flexing

The ends were then cut off and turned to the correct length

One end of the crank was threaded

these are the discs that were in between the journals

Finished crank

michael-au · Dec 7, 2024

Finished Crank No. 2, The first one came out really good except I found out I machined the rod journals in the wrong order DOH

Anyway the second one is finished now so I can move on

gbritnell · Dec 7, 2024

Just change the camshaft to match the journals. (Different firing order)

Peter Twissell · Dec 7, 2024

I know that process! I made 3 cams for my Whittle V8 before I got one right. I also made 2 crankshafts for my boxer twin, but that was due to over-revving and twisting the first one.

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