If we can get enough interest out there, Pete will fire this bad boy up and make some real noise in the neighborhood. This massive 20-liter V12 was designed and built by Pete Aardema, Kevin Braun and Kevin Aylesworth. It’s a big one and was designed to run in an H1 Unlimited Hydroplane which is Kevin’s forte. This video is Informal, nothing special, We just want folks to hear how and why this Mega V12 was made. Again, if we get strong interest on YouTube, Pete said he will light it off and make some noise.

, https://i.ytimg.com/vi/yhLOl4rEi6E/hqdefault.jpg

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40 Comments

  1. OMG, EXACTLY WHAT I NEEDED

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  2. 5.625 bore x 4.0 stroke in 12 cylinders makes 1192 cubic inches. That's very oversquare. That thing should rev to 8000 rpm, if you can find strong enough rods. Problem is, the heavy exhaust valve will limit valvetrain operating speed, and unless it's properly cooled, will be a source of detonation. Many manufacturers have designed and put 3-valve engines into production once. They don't do it twice. Go to 4 valves if somebody comes up with some money for you to continue.

  4. Who in their right mind would like to hear that convert money to noise? No one, BUT ALL the rest of us. Hell yeah

  5. Do you all have a degree in engineering or physics. Building while you're sleeping lol.

  6. Is this supposed to run low RPM direct drive propeller? Turbo-prop uses gears. So it would be okay to have 4 valves and cam over rockers. For me it is: In a piston engine you've got this excotic material in the spark plug and in a turbine you have it in the blades. For this reason at least the number of spark plugs should be minimized, like one per cylinder. Water can keep everything cool but the exhaust valves. So knock happens there. So we place the plug in between the two exhaust valves so that it almost interferes with the exhaust valves. In cheap road going off-the-shelf engines the spark plug thread is so that the plug opens towards the exhaust valves ( and is protected from the fuel spray ). So I guess that on these large cylinders there would be space to rotate the plugs. On the one hand the hot exhaust touches the exhaust valves the longest time, but on the other hand there would be no knock.
    The intercooler looks so small compared to the engine.
    If I tried to improve on battle proven WWII engines I would want to have some joker. For example I had the idea to start with a HEMI head and add small valves on the sides. So we get optimal spherical surface to volume on combustion, two places for the beloved air craft twin-spark, all surface covered with valves, and the small valves would not hit the one big in the center. Small valves need less power so we don't care about a small pushrod at 6kRPM.
    With extractor header and the super charger and proper fuel injection, is it possible to flush out the hot exhaust out of the cylinder far before TDC? And then blow past the exhaust valves so that those only touch cold lean air most of the time. Stoichiometric fuel would back fire / emit, so it is only allowed to come later.

  8. how about building a supercharged 1948 V twin Indian Chief engine .. it would be cheaper to build and easier to sell

  11. Need to find a shorter wheelbase real bus (not the van) and drop that into it

  12. The size of this engine is close to the Rolls Royce Kestral and the Curtiss Conqueor. Nice piece of work.

  17. dutch engenering from Pete Aardema , vol gas met die dikke v12 meneer Aardema

  18. All the pieces are there, that's an absolute beauty. The dual plugs are a must for timing to be efficient. 87mm is about optimal bore size for peak efficiency of a single spark plug. Over a 5 inch bore and a single plug on that chamber would have timing near 40 degrees advance on gasoline would be my estimate. Dual plugs should put it in the 25 degree range I'm guessing?
    I'd love to see Blowdown turbines where the superchargers are in concert with the mechanical drive. Blowdown turbines are like a turbocharger but not as responsive. However the drive pressure is nothing. If it had a set of dual or triple turbine blades per supercharger, not only would the exhaust take the drive load off the cams, (That's what I think I'm seeing) but it would also put the excess force back into the motor mechanically. Sending it directly to the flywheel would eliminate the friction losses and material strength to handle the additional horsepower. I'm thinking 5000hp if they are expecting 3000hp with mechanical drive forced induction.
    Man I really want to visit these guys.
    The Napier Nomad used a 12 blade single blowdown turbine connected directly to the crankshaft. With the right kind of crowd funding, that motor would have no equal in boat racing. Turbines would be a joke in comparison. BSFC could be down 👇 in the low point 3s even high 2s with today's technology. The guys at Swaintech used to be in Loudon NH by me when I raced snowmobiles. The thermal barrier coatings go so far in keeping the heat energy in the exhaust. We were playing with turbocharging 2 strokes in the early 90s. Life got in the way lol. There's definitely room for more weird science out there. Thanks so much for the videos man. You are in the presence of greatness with those guys.

  20. G'day from West Australia, very cool gents Veeeeerrrryyy cool.😉🙂👍👍👍

  21. i think we can "JUST" fit that into my 1991 chevy s10,,,,,,and,,,,,under the "HOOD"!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!?

  24. Has Kevin and Pete looked into finishing or creating their own design for the Chrysler A925 project DOHC 426 Heads the Doomsday engine There is still a demand for these engines in the Fuel world…

  26. I can only imagine if they turbo-supercharged the thing like the P-38's Allison V-12 had. They are already making double the hp; that would be two points shy of looney asylum. (Racing boats back in the 50's commonly used surplus Allisons).

  27. I have made some small scale engines and that is a lot of work, just imagining the amount of work that went in to that beauty is mind blowing. Awesome work gentlemen just awesome.

  29. Those old piston powered thunder boats were awe inspiring .Miss watching those run…..

  31. Get a old 4×4 truck, leave it in 4wd, making it front drive, cut and extend the frame, connect that monster engine to a gear box and directly to the axel, so it can be chassis Dyno rested, and drive the truck onto a trailer, test Riggs?! 😂 I'd love to see that, heck I'd love to build it myself! Happy Thanksgiving everyone!!

  33. Awesome, I have ad similar ideas myself , these guys are awesome 👍😎

  38. That works out to about a 4 inch stroke with 5.625 inch bore, 4000 fpm piston speed would be 6000 rpm. I would love to hear this big boy sing in real life…"Daddy sang bass…"

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