Hudson/Hossack - Why bother? Part 11

[@andypdq]

So, you have more surface area for the same cubic capacity than you have with a round cylinder with the same stroke, so you lose more heat to the coolant, be it air or water, then you have the problem of making square seals work efficiently at the corners. Build one.

[@dirtygarageguy]

Run that surface area thing by me again. What is the heat flux at 15,000 rpm?

[@dirtygarageguy]

I think you've been watching too many D4A videos.

[@andypdq]

@@dirtygarageguy Make one, single would be fine, put it in a bike frame and demonstrate it.

[@dirtygarageguy]

That's what I'm doing...

[@andypdq]

@@dirtygarageguy Fantastic, theory is fine, but it means nothing, if nothing is built. I eagerly await the results. Actions speak louder than words.

[@JF42339]

One giant advantage this has over the wankel in sealing is only one side has combustion. The wankel burns the oil off from both sides of the seal, where the hossack can keep oil on one side like a normal piston engine.

[@alexbott7738]

Love the blackboard vids👍 A live stream blackboard session would be cool.

[@andrewjames6911]

Second this ^

[@pilot.192.7]

I can't wait for the next video. I have been loving these videos and i think that the hossack 2 stroke engine is a brilliant idea.

[@BlaineRush-b8h]

The dopamine I get from a new Hosssck engine video is enough to cure 10 men from depression! Can’t wait to see more

[@mauricevandoeselaar]

I missed this one because of all the "other kind of videos" that you are doing lately. Glad this subject is still alive

[@richardjones2151]

Refreshing that this subject is still alive 🙂

[@nathanquinlan2719]

Keep going Matt. I look forward to seeing the hollowed out pistons and weight drop.

[@riddioughp]

Finally some board talk! 💪

[@gafrers]

Yes for the Blackboard. Love the Hudson/Hossack, so glad it's back. 🙌🙌👏👏 These are your best videos 💯💯

[@Alan_Hans__]

Good to see an edumacational video again. I personally can't see the Hudson/Hossack working due to tip sealing, sealing as things heat up and expand and the bearing surface of the piston versus cylinder. My own personal rabbit hole that I have been looking at is a split single which has major benefits for 2 strokes and not a huge number of downsides.

[@dirtygarageguy]

"I personally can't see the Hudson/Hossack working due to tip sealing" - Wankels work...

[@gingernutpreacher]

​@@dirtygarageguy could they work/seal for 10 hour's?

[@gingernutpreacher]

@@raflozano597 kzbin.info/www/bejne/o5qpimdmhcifg7csi=H1OZZCXceHR0akke there's also a vid showing a stripdown so you know it is the a hossack engine

[@ShinyUmbreon765]

The huge downside is cost. You have to build an extra top end, and a special con-rod for marginal gains in low end torque. Something motorcycles don't typically need when the running rpm is so high.

[@Alan_Hans__]

@@ShinyUmbreon765 . On a video about the Hudson/Hossack video there's talk about extra cost and special bits :O

[@loddie9]

Great video. These educational type of videos are the reason I subscribed. More Hossack please!

[@nullbureau]

Been hoping for a Blackboard-Hossack series. Favorite engine subject + analogue visuals = chefs kiss 🤌🏻🤌🏼🤌🏽🤌🏾🤌🏿🔥

[@BlaineRush-b8h]

Yes! Please more Hossack engine videos

[@richardjones2151]

Superb!..nice presentation

[@megaidiot]

what an exercise in self control and avoiding certain words :D

[@michaeldemetriou1399]

Shorter stouter crank, Also know as BEEF lighter pistons, over square fast revving in a smaller package

[@michaels1953]

god i hope we see more of these green board vids, i learned more here than collage

[@Racing_Fox]

Why bother? Because it’s fun, it’s good to keep your mind working and projects like this are perfect for that

[@mr0.59]

Hi Matt, do you have a design for the rectangular, or square, piston seals which will be required?

[@dirtygarageguy]

Yes

[@beachboardfan9544]

Ayyyy a whiteboard (chalk board) vid! 🥳 Matt still looks english...

[@carlopitti7500]

The blackboard is Back 👍👍

[@DarkInovator]

best video in a looooong time :D keep em up

[@garyalexander2480]

That was a fun one ❤

[@leoa4c]

Is it exclusively a 2-stroke engine? The valvetrain could be challenging on 4-strokes. Being a 1000cc 2-stroke engine, it will likely end up as a victim of the emissions police. Regardless, I do like the idea, especially how compact it can be. You know a lot more than I do about engine design, and you are always very careful about unusual concepts, so I very much trust your judgment on this one.

[@dirtygarageguy]

"Is it exclusively a 2-stroke engine?" - Well exclusively but this one is. "it will likely end up as a victim of the emissions police." - What emissions, this isn't a production engine.

[@leoa4c]

@@dirtygarageguy Ah ok. I thought that you had future mass production in mind. Bur do you intend to produce a prototype or release the drawings for someone else to have a crack at it?

[@dirtygarageguy]

@leoarc1061 I'm doing the prototype

[@leoa4c]

@@dirtygarageguy It keeps getting better! I can't wait to see its development. I'm not seeing a way on how I can help other than the obvious financially help, but hopefully something will come up which will allow me to contribute in one way or another. This project will be really, really, really great to watch!

[@guillo88]

Yesss ! ! ! this is my favorite serie . Is part 12 coming soon? hope you catch up with hudson/hossack !

[@jonathanfernando-k3b]

yay i was wondering when u were gonna talk about this engine again

[@mateuszkasza]

Yes!! Yes yes yes!

[@untrainedprofessionals2374]

How would you go about manufacturing just the piston rod assembly as one unit? Being alloy rods are not cheap so combining both the rod and piston might be very expensive. Also when a rebuild is necessary you wouldn't just be replacing pistons but the rod as well. I have no idea of manufacturing processes but am curious how it would be done.

[@dirtygarageguy]

You've over-thinking this.

[@ShinyUmbreon765]

Matt has 10 other videos explaining questions like this. And another two or three on Mr. Hossack's prototype. For mass production: extrude the shape into long billets, cut into sections with a big ass slitting saw then cnc machining the rest. A line of CNC mills with pick and place robots could crank these out. For prototypes: lost foam cast, then clean up on a cnc mill.

[@tomkatt1938]

8:50 the only 1000cc V6 motorcycle that I know of is the Laverda from like, 1977 or something

[@dylancrow7919]

It opens an Avenue guys.

[@barebonesmc]

Laverda made a 100cc V6 🙂

[@luddite6239]

Now _that_ was fascinating - thank you. I'd never come across this design before. Is it naned after the same guy who designed the funny front-end suspension?

[@dirtygarageguy]

Yes it's the same guy. Norman Hossack, I talk to him frequently.

[@luddite6239]

@@dirtygarageguy Thanks. That must be quite an intellect! 🤯

[@victorgonza4528]

Nice blackboard videos are back

[@Stathis10]

Matt the piston and conrod will be lighter but, they have to be the same material since its one part, so if its made with forged steel like performance conrods are the piston part will be forged as well so it will not be lighter??

[@inevespace]

good question. As I understand you can make aluminum rods (you can buy them) but they "accumulate" stress and should be replaced more often

[@chrisdavidson911]

they could be joined, just not flexibly

[@BlaineRush-b8h]

The point of this engine is that it would be extremely cheap and simple. For example, Matt talks about how the case/chamber could be made from aluminum extrusions etc. So maybe you could make this single piece rod/piston from aluminum and just replace them more often as part of the maintenance schedule, since they’d very cheap and easy to replace. This is a 2 stroke after all, it’s just an extremely simplified version. I don’t think it’s trying to compete with 4 strokes on longevity.

[@Stathis10]

@@BlaineRush-b8h You are right, it serves a different purpose

[@rohi7412]

Why not just a square bore conversational? What's the benefit of removing the wrist pin?

[@guillo88]

less weight (more revs), fewer parts (simpler and cheaper to make)

[@untrainedprofessionals2374]

@@guillo88 Casting both the rod and piston as a single unit surely would be more difficult? A standard piston is alloy and the rod is cast steel/iron. Alloy rods are expensive .so wouldn't the new design also be expensive? I don't know anything about the manufacturing processes that would be involved making the design Matt is talking about.. Do any befits out weigh the cost? At present if I do a rebuild all I need are pistons and rings . I have never had to change rod s as well.

[@pnblondon1087]

You didn't explain at the beginning that the Hossack piston is not round! And it wasn't clear from the moving design either, because it was just 2D. It was only 11 minutes in, when you drew the diagram from above, that it became clear that the flippin' thing is oblong!

[@dirtygarageguy]

Apart from this is PART 11 of a series... Jesus christ.

[@pnblondon1087]

@@dirtygarageguy OK, but this is where I came in. Believe it or not, it was Norman Hossack himself who sent me the link! it wouldn't hurt to repeat the fact that the piston ain't round...just sayin'

[@dirtygarageguy]

@pnblondon1087 or watch the series in order, like an adult. Don't blame me for your inability to read.

[@pnblondon1087]

@@dirtygarageguy I can read perfectly well, thank you. I still think this section could have been presented more clearly, but I wish you well with your endeavours in getting a Hossack engine fully operational, and if possible, powering an actual motorcycle.

[@dirtygarageguy]

@pnblondon1087 clearly you can't. Well done on making your mistake my problem.

[@TOBERMORY-99]

Legs akimbo

[@Manuqtix.Manuqtix]

It’s your surname

[@bradtyson]

Aayyyyyy

[@richardjones2151]

@ kzbin.info/www/bejne/fYaQf5uQa9ydmsU "spherical"...slip of the tong...'cylindrical'?

[@dirtygarageguy]

Well yes...

[@TheDocChannel]

How do you seal the piston in the bore? Tips, like a Wankel? Same tip wear problems as a Wankel?

[@chrisdavidson911]

same ring wear problems as a 2 stroke

[@dirtygarageguy]

What tip problem?

[@TheDocChannel]

The rotor tips on the Wankel were a bastard for wearing out.

[@chrisdavidson911]

@@TheDocChannel depends, drive it incorrectly and they are