ESE's works engine tuner

[Flettner]

Husaberg, here is a crude diagram of the uniflow concept, it gives you an idea at least.
I would say this is how the "Barker Headless" worked.

[Flettner]

Crazy Man, yes, as it happens I've just got all the 100 uniflow bits out from under the bench about an hour ago. I can see I'd already made new exhaust pistons. It's biggest problem was the nitrided steel sleeves. They kept distorting, so I made cast iron sleeves these worked but the rings were also cast iron ( weed eater ). At 14000 plus rpm the ring life was about 20 minutes. It needs nikasil or chrome barrels. I'm looking at what it would take to re make them now that I know how to cast twostroke cylinders. Also the ignition was a home made CDI and ALWAYS gave trouble. Now I would just fit two ignitec's.
What ever happened to that aluminium ? did it get used? I think I still have an ingot stored under the bench some where.

[husaberg]

Husaberg, here is a crude diagram of the uniflow concept, it gives you an idea at least.
I would say this is how the "Barker Headless" worked.

likely but it is the 4 carbs and 4 exhausts that intregue me with it. my last guess was a twin slit single on a common crank-pin like a Garelli

The Garelli is a real oddball split single. Most are tandem cylinders with either two rods or a forked rod. the garelli is side by side with a very long gudgeon pin. You're looking at the right hand cylinder which has the inlet ports at the bottom and two exhausts - one at the front of the cylinder and one at the back. No problems doing that as the transfers are all in the other cylinder.

So - sucks in on the right hand pot, transfers in the left hand one from a common crankcase , common combustion chamber , exhausts from the right hand pot as it's transferring fresh mix up the left barrel.....

Wob would approve of the long blowdown possible - and the uncontaminated fresh charge.

Frits - I see we overlapped - no factual differences which is pleasing - and no, I'm not old enough either.

PS if you click reply with quote you will see what i did with your pic

[Flettner]

That's a very crude picture, you would probably want four carbs, one for each piston. And four exhausts would also be desirable. Yes I'm sure they use a single crank pin like the old split singles. It looks like just two split singles head to head, with a chain drive to join them. Almost as crude as my picture, is there any record of how it ran??

[koba]

Husaberg, here is a crude diagram of the uniflow concept, it gives you an idea at least.
I would say this is how the "Barker Headless" worked.

Would it be better to have a hot side and a cool side?
Both exhausts on one crank and inlets on the other?

Would make heating and distortion more predictable, therefore manageable?

I'm not sure at all, it's just my first thought when I see that pic...

Edit: Nevermind, now I see the 'transfer?' port arrangement...

[TZ350]

Tests of Reverse Uniflow-Type Two-Stroke

Paper Number: 2004-32-0040

Abstract:
Conventional two-stroke engines have defects such as unstable combustion, high fuel consumption rate and high HC emissions. In order to overcome the defects, a direct fuel injection system and a novel scavenging system were adopted. The authors tested a newly developed reverse uniflow-type two-stroke direct injection gasoline engine that was designed by numerical simulations. In comparison with the base engine at low engine speed, HC emission was decreased by up to 80%, and BSFC was reduced by around 40%. Power and BSFC were superior to those of a latest port-injection four-stroke engine. Furthermore, it was found that engine performance of exhaust gas emissions, fuel economy or output power can be selectively optimized by switching homogeneous and stratified combustion.

[Flettner]

Mine has 6 degree crank out of phasing, exhaust piston ahead of the transfer piston. Helps with blow down time and gives the transfers a little more open time. The exhaust piston always gets the most thermal load, this is the feature that needs most attention, but certainly won't just melt as I was told it would .
Another useful feature is the the engine is rated as a twin, only two combustion chambers. Good for a twin cylinder class.
I'll get some pictures of the engine bits if anyone is interested?

[koba]

I'll get some pictures of the engine bits if anyone is interested?

I'm sure I speak for pleny more here when I say:

Yes!

Please.

[Yow Ling]

I'm sure I speak for pleny more here when I say:

Yes!

Please.

This vintage motorcycle stuff is causing quite a stir with the racers in the old peoples home

[Flettner]

What?? are we talking fuel injected F9?

[F5 Dave]

Crazy Man, yes, as it happens I've just got all the 100 uniflow bits out from under the bench about an hour ago. I can see I'd already made new exhaust pistons.. . .

Time to get it ready for the next Bucket GP. Promise it won't get a special award this time.

nah seriously cool, just didn't have a camera in those days.

[wobbly]

Allah or God save us - the Uniflow Psychos have infiltrated the thread.
HELLLLPPP, we need the team that took out Osama to do a night raid on the terrorist training ground in Eureka.
I can point to the location on Google Maps to make it easyer.
BE VERY AFRAID.

[Grumph]

Allah or God save us - the Uniflow Psychos have infiltrated the thread.
HELLLLPPP, we need the team that took out Osama to do a night raid on the terrorist training ground in Eureka.
I can point to the location on Google Maps to make it easyer.
BE VERY AFRAID.

I agree 100%....but we of the old folks home have another target. However it's proving hard to come up with enough ready cash to get a taxi to the Yow Ling residence....

[crazy man]

Crazy Man, yes, as it happens I've just got all the 100 uniflow bits out from under the bench about an hour ago. I can see I'd already made new exhaust pistons. It's biggest problem was the nitrided steel sleeves. They kept distorting, so I made cast iron sleeves these worked but the rings were also cast iron ( weed eater ). At 14000 plus rpm the ring life was about 20 minutes. It needs nikasil or chrome barrels. I'm looking at what it would take to re make them now that I know how to cast twostroke cylinders. Also the ignition was a home made CDI and ALWAYS gave trouble. Now I would just fit two ignitec's.
What ever happened to that aluminium ? did it get used? I think I still have an ingot stored under the bench some where

the aluminium is still under the bench still waiting for a project maybe the 3 clinder 100 me and brent are having a go at .l had the 100 water cooled twin the day you brought your uniflow out . remember you saying your 100 went good in a gokart and then somthing was going wrong when you put it in your bike . looked cool though

[Flettner]

Yes it was that bloody home made ignition, it had two units running four plugs. It needed both to keep the advance to a reasonable number, one unit would spark in atmosphere but not under pressure! It was working properly in the go kart but on the change over to the bike it was damaged and it took months to finally find the problem. Just like being very retarded ( because it was ) I was over it by then!
Here's looking down the barrel of a 440.