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W Engines

by petropixel, published

W Engines by petropixel Apr 2, 2013

Featured Thing!

Description

No fooling!

Volkswagen wasn't the first to squeeze the two banks of a V engine together to fit under one cylinder head, but they were the first to wonder what they would get if they put two of THOSE together with a common crank. The result was an engine with four banks of cylinders, which they called a "W" engine (a name that had already been taken by a 3-bank layout, Wikipedia argues the double-vee or WR might describe it better). VW tiptoed in, bringing W8 and W12 engines to market first, but I'm skipping ahead to the ultimate version, the W16. You might recognize this as the layout used by the Bugatti Veyron.

youtube.com/watch?v=rDpSbhKXbOs

W8/W12 versions now available for download! I will be adapting this new (crossplane!) crankshaft design to fit my VR engine models.

Recent Comments

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The blocks only have "repaired" in the filenames because they've been run through Netfabb, the "originals" would be identical except for some flipped faces and tiny holes in the mesh that cause really weird print errors.
It could just be a problem with your printer's tolerances, try measuring diameter of the cylinder bores and the pistons you've printed and then scaling up the pistons a bit before reprinting them to make up the difference?
I've never really had a problem with the crank but you may want to try the remixed version, others seem to have had better luck with that

I tried printing one out, there is such a large gap between the piston and the cylinder it just binds up. Sanding it makes it worse. Ended up with 3 broken cranks!

Any tips?

Cheers

That's about the same layer height I used. Wish I had been more specific about what infill I used because I don't remember, but that should be fine?

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License

W Engines by petropixel is licensed under the Creative Commons - Attribution license.

Give a Shout Out

If you print this Thing and display it in public proudly give attribution by printing and displaying this tag. Print Thing Tag

Instructions

If you downloaded the W16 in the first few days and you're having trouble printing the crank, download the updated file, or the remixed one over there.-> Sorry!

Pick an engine. Print one crankshaft and two sets of everything else, using a high infill setting (unless you're printing the W8, then you just need one crank, two block halves and one set of "W16" pistons and rods). Sand or hone the parts until the pistons slide easily in their bores, rods spin on their crank pins, and the crankshaft actually fits together. Use 3mm filament as wrist pins for the pistons and rods. Slide one pair of piston/rod assemblies onto each crank pin (note that the pistons are not symmetrical, the lower edges of the piston crowns should face the center of the block. Each pair of piston sharing a crank pin should be facing the same way, if that makes sense.), then assemble the crankshaft minus the end pins. It's a pain, but I've added reference photos. Glue if necessary. Slide the pistons into each half of the block, then line up the crank holes. Press one of those end pins into the hand crank, then use pliers to press them into the ends of the crankshaft.

Comments

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jp911 on Mar 23, 2014 said:

I tried printing one out, there is such a large gap between the piston and the cylinder it just binds up. Sanding it makes it worse. Ended up with 3 broken cranks!

Any tips?

Cheers

petropixel on Mar 23, 2014 said:

The blocks only have "repaired" in the filenames because they've been run through Netfabb, the "originals" would be identical except for some flipped faces and tiny holes in the mesh that cause really weird print errors.
It could just be a problem with your printer's tolerances, try measuring diameter of the cylinder bores and the pistons you've printed and then scaling up the pistons a bit before reprinting them to make up the difference?
I've never really had a problem with the crank but you may want to try the remixed version, others seem to have had better luck with that

KLucky13 on Mar 2, 2014 said:

I'll print out one next week, looks awesome! Would 0,25mm layer height with 25% infill work ok?

petropixel on Mar 3, 2014 said:

That's about the same layer height I used. Wish I had been more specific about what infill I used because I don't remember, but that should be fine?

ncocivi_pw on Jan 3, 2014 said:

What can I use instead of 3mm Filament??

petropixel on Jan 3, 2014 said:

I open up the holes a little with a drill bit and use 1/8" wooden dowel

makermen on Jul 6, 2013 said:

how do you put it togther

makermen on Jul 6, 2013 said:

how do you connect the pistons to the rods?

Emmet_Brown on Apr 17, 2013 said:

When I try to connect the crank pins the crank parts are breaking. Are the files designed that way, so I need to sand them? Or do I need to change my printing settings? The other parts fit well.

petropixel on Apr 17, 2013 said:

Sanding the pins and opening up the holes with a drill bit helps.

bigpoopyhead on Apr 8, 2013 said:

Nice model. Used the remixes crankshaft and it works good.

helpmeimenglish on Apr 5, 2013 said:

Hi, anyone know if/where the download for the engine block design in this link is available?

THanks

http://www.youtube.com/watch?v...

Banjer on Apr 4, 2013 said:

One of the crank parts isn't leveled at z=0 wich can lead to problems during printing

JohnA on Apr 7, 2013 said:

Ha, just failed the print twice on that as well. Oops! Worse though, I'm trying to print all pistons, rods, and crank parts at once!

petropixel on Apr 4, 2013 said:

Fixed now. There were a few parts that broke free of the bed when I printed the crank, I hadn't considered that one of them might have never stuck.

3maxon on Apr 4, 2013 said:

9W is the answer. What is the question?

"Herr Wagner, you spell your name with a V?"
"Nien. W"

In all seriousness, I worked on VWs / Audis for a large chunk of my life, and this makes me grin hugely. Considering all the grueling hours of precise work it takes to machine parts for a miniature model engine, it seems almost unfair that we can do this with our printers in a few hours... except that our model would melt if ever operated.

abobotek on Apr 3, 2013 said:

'W' in German is named (translated to English) "double 'v'", so the W moniker isn't an error of the native tongue of the engine's designers.

Aggresive on Apr 2, 2013 said:

trouble slicing the block with kisslicer, lots of self-intersections, and degenerate faces. All the other parts slice great

badBrick on Apr 2, 2013 said:

Way Cool.. Put some gears on that thing. You might like this for some more inspiration.

http://www.wimp.com/tiniesteng...

CodeCreations on Apr 2, 2013 said:

Wait -- let me check the garage... Yep -- that's in the Bugatti Veyron alright. lol

Awesome model -- and educational, too. Thanks!

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