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Henry Yunicks Red Hot Vapor Engine Re-Creation

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pmuller9
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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #101 by pmuller9 » Wed Apr 24, 2019 11:13 am

LOL, I meant the bottom of the lower chamber as in cylinder orientation in the direction of piston travel.
If I'm looking at this correctly, the intake ports are on the top of the engine but are more towards the crankshaft than the original design and seemingly on top of the bushing plate.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #102 by DeltaV » Wed Apr 24, 2019 11:29 am

Yes, the intake charge is coming directly from underneath the piston. This should allow for an ideal volumetric flow and superior pre-charge than any other two stroke via having higher compression under the piston than usual to force the charge into the combustion chamber.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #103 by pmuller9 » Wed Apr 24, 2019 11:51 am

Having intake charge enter under the piston during the entire piston upward stroke and not having to pull a high vacuum like the traditional 2 stroke eliminates that particular pumping loss and results in a higher volumetric flow as you stated.

Normally a high compression under the piston is required for transfer especially as piston speed increases with rpm.
What are you doing differently during the piston down stroke to accomplish transfer?

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #104 by DeltaV » Wed Apr 24, 2019 12:00 pm

I'm just using reed valves coupled to a reduced vacuum intake coming directly under the piston to increase flow. Nothing special, really. The super low clearance/volume from the piston underside and valves allow for a higher compression than whats normally possible going through the crankcase.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #105 by pmuller9 » Wed Apr 24, 2019 12:29 pm

Perfect!

May I suggest as you benchmark this first prototype that you add a pressure sensor to the combustion chamber so you can observe the cylinder pressure versus piston position.
You will want to know when the engine is in detonation mode and if it comes out of detonation operation.
You also want to know what the detonation pulse timing is and what effects the timing.

This testing should be done on some type of dynamometer where you can apply load at various rpms.
You can put an Eddy Current Dyno together quite easily using a generator.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #106 by pmuller9 » Tue Jul 16, 2019 9:53 am

Progress report?

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #107 by DeltaV » Tue Jul 16, 2019 11:00 am

Progress Report:
I've purchased all the hardware and a small lathe for the completion of the project. The lathe is probably inadequate but its what I can afford and have room for. After 3D printing all the components. That took almost 2 months to configure the 3D printer correctly. 3D printing is hard to get right! I tried to melt enough aluminum to cast my own components but I found that after 8 hours of blown extremely hot bonfire levels of heat using logs of walnut I just could not melt enough aluminum fast enough to justify casting it myself. I thought about building my own electric arc furnace but my 100 amp breaker box can't provide enough power to do that, either. So I'll have to make the engine, hook it up to a generator and use the power from that to cast more engines. So I found a foundry that is willing to cast the block, combustion chambers, pistons, intake manifolds, cover plates, and various other components to make not just 1, but 2 prototype 49 cc engines for free. Shout out to Art Castings of Illinois for their immense generosity in assisting with the project! The castings will arrive in less than a month as of writing this. By the time the castings come in my charcoal kiln should be done, I have an anvil and will be needing a a lot of charcoal for the forging of the yoke and crankshaft. For the yoke I'll be hand forging it using old leaf springs from an F150 layered with old bandsaw blades, because I flat out lost the last piece I welded up specifically for that task :bang: . This will give me a steel thats considerably stronger than mild steel without costing an arm and a leg (good alloy steel plates 1" thick would cost a lot of money). As far as the old engine blocks go, I set them aside because the cost of a rebuild would run about 1000 dollars and I'd rather just put that money towards the Bourke engine project at this time. If you want to buy them from me I'm more than open to the idea of selling them, otherwise I'll set them aside for a future project (would make for awesome tractor engines for an old restomod tractor).

As far as sensors goes, I'll run the engine and see how it does. If its stable I'll immediately start adding sensors just about everywhere for everything hooked up to a generator that can double as a dyno. If that works well I'll just flat out go off grid with it and live stream the 24/7 operation continuously until it breaks. The other 49 cc engine I'll try to mount it on a small motorcycle to make a motorcycle that doesn't require a license plate yet can still go on the interstate.

I'll give you all pictures of the castings the day they come in the mail!

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #108 by pmuller9 » Wed Sep 11, 2019 9:20 pm

How is the Bourke engine parts production coming along?

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #109 by DeltaV » Fri Sep 13, 2019 10:10 am

Yes! I outsourced the casting to a specialist foundry, Art Castings of Illinois. Harry has incredibly generously offered to cast the prototype parts pro-bono. I just got the castings in the mail two days ago. However, these are the preliminary castings. They didn't come out well, and Harry was iirc going to melt them down to try again. Instead I had him send them to me anyway to see if I can get at least some good components out of them. I was glad I did! I got good transfer port covers, some decent cover plates, and a few other parts. More importantly, I screwed up. I am now redesigning the block's intake dog ears because the reed valves don't fit. So I'm re-doing the model. However, the blocks I received I'll still try to make good use of them despite not having reed valves.
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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #110 by pmuller9 » Fri Sep 13, 2019 12:14 pm

Outstanding generosity on the part of Art Castings of Illinois.
Great work on your part also.

Can you post a picture of the reed valves?

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #111 by DeltaV » Fri Sep 13, 2019 2:58 pm

I'm designing it to use standard Yamaha 2 stroke reed valves. No sense in making proprietary parts when we can have maximum parts compatibility.

https://media.discordapp.net/attachments/613088447162351622/621862093553008660/2133-1.png?width=640&height=640

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #112 by pmuller9 » Sat Nov 02, 2019 7:16 pm

Is it too early for a progress report?

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #113 by DeltaV » Sat Nov 02, 2019 8:40 pm

Unfortunately there are only a few updates. My 3D printer broke again so I'm outsourcing the 3D prints. I'm having a foundry cast the components for me for the sake of speed. I should be getting good castings back within a couple months.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #114 by DeltaV » Wed Nov 27, 2019 2:36 am

New updates! New 3D prints have been made and some improvements to the design. Instead of custom paper/flat gaskets O-ring glands will be machined into all faces so we won't ever have to worry about proprietary gaskets for the cover plates or combustion chambers. I feel very confident in the quality of castings moving forward. Also the Freedom Ship Project has agree'd that they want a series of Bourke engines and thermal cracker vapor fuel systems to power the worlds largest vessel ever to be made, on the condition that I build them at cost IE no profit. I'm more than happy to deliver!
http://freedomship.com
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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #115 by pmuller9 » Thu Nov 28, 2019 10:51 am

Great looking update. Love the different collors
How soon before you can assemble a mock-up?

Freedomship looks like a great place for the rest of my retirement.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #116 by DeltaV » Thu Nov 28, 2019 12:41 pm

Mockup? No, these will be used for investment casting directly. Once the castings are machined I'll assemble a "mockup" and post pictures, but from there is just a matter of machining the rod and yoke assembly and testing!

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #117 by pmuller9 » Sun Mar 08, 2020 4:43 pm

Update?

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #118 by DeltaV » Mon Mar 09, 2020 11:32 am

YES! I've been working on a charcoal kiln and charcoal fired furnace to melt the metal for the casting and they are both finally done. I should be getting to casting the metals sometime later this month or early next month. I've also built a wax sprue extruder and just gathered all the materials needed for the casting. Now I just need to find time between my business obligations to get the job done.
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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #119 by pmuller9 » Fri Sep 04, 2020 8:04 pm

Progress?

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #120 by DeltaV » Sat Sep 05, 2020 1:34 am

Yes, in fact. Amazing progress.

First order of news, I have obtained an original Bourke 30 CID engine straight from the 1950's. I've completely rebuilt it top to bottom and all I'm waiting now is the cerakoting. I've treated all the parts with RF85 and nikasil coated the cylinder sleeves. I've recently purchase a large leblond lathe a week ago with which I can turn my castings that I poured via the furnace I made to make parts such as pistons, cylinders, crankshafts, etc. My shop is much too small so I'm preparing a foundation for a shipping container to place my lesser used tools as of now. In a couple weeks I'll have the shipping container placed down and I'll unload my new (to me) lathe and install all the wiring to my phase converter. I'll finally be able to turn my castings into final parts and make new crankshafts.

Also good news, in a few weeks I'll be meeting with a private investor that is seriously thinking about kicking me 3 million dollars to construct a rapid prototyping facility for the production of these fickett-jacobs cycle pulse detonation engines.

If that goes well, because my company will have all the forging, casting, and machining equipment for limited niche production runs, I will co-develop a next generation cross flow 4 valve aluminum head with roller bearing shaft mounted rockers and roller bearing lifters for the old Ford 300i6 as a bolt on kit. Additionally, I'll reproduce forged cranks, fully skirted pistons made for 240 rods, and high flow exhaust manifolds for easy turbocharger installation. This should bring the old high nickel 300i6 blocks into the 21st century.

Once I get the lathe installed I'll post some pictures. Give me 3 weeks tops. When I get my original Bourke engine back from the cerakoting shop I'll post pictures of that as well.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #121 by pmuller9 » Sat Sep 05, 2020 7:21 pm

Yes. Amazing progress!
Congratulations on securing an original Bourke engine.
A lot of exciting parts for the 300 six.
Thank You for the update

Just as a side note: The 240 "no oil hole" rods are becoming scarce.
AFAIK I'm the only one that has put together a 300 with 240 rods for a street engine in recent years.

The 4 valve aluminum head will need a good 6.8" long rod for naturally aspirated use.

For heavy turbocharging we have resorted to using the 6.385" small journal (2.100") Big Block Chevy rod.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #122 by DeltaV » Sat Sep 05, 2020 8:34 pm

Henry Yunick said that running the longest connecting rod to stroke ratio possible is better. According to him, there's lots of performance gains to be had. According to Reher-Morrison's "Championship Engine Assembly" there are virtually no performance gains to be had. I haven't built enough engines to hold a firm opinion one way or the other, however, here's what I do know. A longer connecting rod to stroke ratio WILL do the following: reduce piston sidethrust and slap, and reduce the angular load on the connecting rod, which will make the pistons and skirts last much longer. Coupled to fully skirted pistons for superior load distribution, and we will have ourselves a winner. Because our fully skirted pistons will be our own custom design, we can make the wrist pin bore as high as we like/can. Up and into the scraper ring if we like. With a new 4 valve head we may even be able to get performance high enough to merit putting the high nickel 300i6 blocks back in production for niche and special use cases. With modern technology like RF85, nikasil cylinder coatings, cerakote, and other technology thats come into being since 1965, we can bring this workhorse of an engine into the 21st century. I'd expect no less than a 500k mile lifespan from a next gen "big six" and no less than 2 million miles from the next generation scotch yoke engine.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #123 by pmuller9 » Sat Sep 05, 2020 8:45 pm

The 240 rod used on a 300 crank allowed me to reduce the piston and pin weight by 30% plus the piston no longer protrudes past the bottom of the cylinder wall.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #124 by DeltaV » Sat Sep 05, 2020 8:51 pm

Interesting, so you're actually reducing the skirt size to reduce reciprocating mass.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #125 by pmuller9 » Sat Sep 05, 2020 8:57 pm

The stock piston skirt travels 1.1 inches below the bottom of the cylinder.
Generally the piston height is 2 times the wrist pin height which keep the pin in the center of the piston.

If you want to do a fully skirted piston with longer skirts the weight will still be reasonable.
It depends on the application. High rpm performance or low rpm workhorse.
Our blower pistons are constructed with full skirts and have an added support around the inside bottom of the skirt.

If you cast a new block the bore centers are 4.480 and there is no reason why the cylinder bores can't be 4.125" and be Siamese for a very thick cylinder wall and better block rigidity.
The larger bore has less open valve shrouding or will accommodate larger valves.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #126 by DeltaV » Sat Sep 05, 2020 9:44 pm

Those are great ideas. All will become possible if this investment goes through.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #127 by pmuller9 » Mon Sep 07, 2020 11:16 pm

I forgot to add.
Piston skirt area is only part of cylinder side loading wear factor.

The other and possibly the more significant factor is piston balance.
If the piston's Center of gravity is off center then the piston tries to rotate in the bore during acceleration in both directions as well as the change of direction at TDC.
The object is to have the center of gravity at the center of the piston.

In addition the force on the piston during the power stroke is best centered when the piston has a flat top or Spherical dish.

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #128 by DeltaV » Mon Oct 05, 2020 1:20 am

Updates.

The investment did not go through, however this only delays inevitable success.

I've also greatly improved the design by turning it into a double acting engine, meaning both sides of the piston will be a combustion chamber. This means an 8 cylinder engine will produce 16 power strokes per crankshaft revolution, and I'll use schnurle porting to facilitate the use of a flat top piston. This will necessitate the use of a supercharger to replace the underside of the piston to pressurize the incoming charge.

I just purchased and installed a shipping container to store my lesser used tools make room in my shop for a lathe I just purchased. This is the last tool I need to be fully capable of producing my own engines entirely. I also have an original Bourke engine that will be back from the cerakote shop on the 17th.
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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #129 by pmuller9 » Mon Oct 05, 2020 9:58 am

DeltaV wrote:I've also greatly improved the design by turning it into a double acting engine, meaning both sides of the piston will be a combustion chamber. This means an 8 cylinder engine will produce 16 power strokes per crankshaft revolution, and I'll use schnurle porting to facilitate the use of a flat top piston.

Thanks for the update

You will only double the power strokes per rev in a single cylinder engine.

Once you go to multi cylinders the power stroke count stays the same because you have two cylinders firing at the same time, the top of one cylinder fires at the same time as the bottom of the adjacent cylinder.
What you will accomplish is doubling the displacement for nearly the same physical size engine. (not counting the supercharger)

I would have concerns over the longevity of a connecting rod seal against detonation pulses in the bottom chamber.

Since the two Schnuerle intake ports need to point upward will there be two sets of ports per cylinder, one set for each of the two piston chambers?

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Re: Henry Yunicks Red Hot Vapor Engine Re-Creation

Post #130 by DeltaV » Mon Oct 05, 2020 9:22 pm

I designed it so that one set of ports is all that is required to feed intake and pull exhaust from both sides of the piston by keeping the piston height shorter than the stroke by the same length as the height of the ports.

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