ESE's works engine tuner

[TZ350]

Thanks to help from a few friends, Gigglebutton, Kel and Chambers the Team ESE dyno finally has an exhaust extractor.



The last few days we have been working on improving the power spread on an air cooled 2T for the 2-hour.



Had a few problems, cracked piston, now that is not supposed to happen with forged pistons and a rotated ring that got court in the exhaust port. This is the third Wiseco piston that has done this to me. The ring peg gets pushed or works back in its hole and then the ring rotates.

[Flettner]

Had a few problems, cracked piston, now that is not supposed to happen with forged pistons and a rotated ring that got court in the exhaust port. This is the third Wiseco piston that has done this to me. The ring peg gets pushed or works back in its hole and then the ring rotates.

Shit wiseco.

[adegnes]

My thought is that the grooves allow the flame front(s) to access the squished gasses and allow them to be burnt as part of the combustion process.
i.e. The combustion pressure forces the flame deep into the squish via the groove channels. The descending piston allows room for the combustion.

If it actually works, it's a good thing.

Don't want them in a Ringless engine.

But the flame must be reaching the unburnt mixture in the squishband as it is opening up while the piston is descending from tdc with a conventional chamber too. Or? Just seems logic(yeah, I know logic doesn't apply to two strokes...}

I can see the possible sense in using a flame grove in a 4T but the talk is not positive about them for a 2T. But if anyone wants to front with a bike fitted with one of these heads and an identical head without the groves I would be happy to run a back to back dyno test on them for free so long as the results and pictures can be posted on here.

Great idea!

[Pursang]

But the flame must be reaching the unburnt mixture in the squishband as it is opening up while the piston is descending from tdc with a conventional chamber too. Or? Just seems logic(yeah, I know logic doesn't apply to two strokes...}

Squish band mixture is cooler and less dense as the gap opens. May burn slowly, and only from the leading edge, if at all.
Hence the need for a tight squish so as to reduce the waste of this part of the charge.

Hot dense columns of actual combustion, pushed into this 'dead zone', might heat and stir it up enough to be part of the main combustion burn.

I don't know....that's why it's just a speculative thought and not a theory. :

I'm not working (for money) at the moment, I'll happily accept a generous grant to run some conclusive tests.
( May involve a trip to NZ & a play with Team ESE's Dyno.)

By the way TZ, the extraction pipe looks great, but a bit too four stroke, needs a bulge in the middle.

Cheers, Daryl.

"First they tell you you're wrong, and they can prove it.
Then they tell you you're right, but it's not important.
Then they tell you it is important, but they knew it all along."
Charles Kettering.

[adegnes]

.

I don't know....that's why it's just a speculative thought and not a theory. :

Me neither...
Welcome to the forum!

[Grumph]

Singh slots have been discussed before on here. I asked the question at the time "would you want a stream of oily unburned mixture squirted at the plug?" It went a bit quiet after that....
There is of course the possibilty of arranging them at an angle so as to promote rotation of the mixture - but I have no idea how that would impinge on the existing squish regime. On balance probably badly IMO.

[41juergen]

Great stuff! Looking forward to seeing how it goes!
Is that the stock reedbox? Did you modify it?(other than changing reeds) Could be usefull in other applications with how it's angled!

Thank's Alex, up to now I only cleaned up the reed case rubber ridge were the reeds contact the case. I will start with Wob's recommendation how to set up reeds (with spacer and the stopper plates). Also I got reeds with 2 different stiffnesses, the upper one (named "oben" on the picture) will get the stiffer one, the lower reed will have a slightly lower stiffness.

[husaberg]

Also I got reeds with 2 different stiffnesses, the upper one (named "oben" on the picture) will get the stiffer one, the lower reed will have a slightly lower stiffness.

If you are going to name your reeds, may i suggest Frits and Wayne?

[F5 Dave]

Dyno extractor.

We dearly need one of those and ideally a clean air feed to the fan. Not likely to happen, but this dyno used to live in such an environment along with soundproof room. It was awesome.

Now the starter motor is f`d and its in a glorified shed, albeit with an industrial fan.

Didn't help much running methanol. Eyes started watering. Just couldn't stay in there. Poisonous stuff I'm sure.

Usually come home and jump into bed next to the wife ponging of 2 stroke smoke.

Not sure why she smells like that. I guess it could be me.

[Hemi Makutu]

Dyno extractor.

We dearly need one of those and ideally a clean air feed to the fan. Not likely to happen, but this dyno used to live in such an environment along with soundproof room. It was awesome.

Now the starter motor is f`d and its in a glorified shed, albeit with an industrial fan.

Didn't help much running methanol. Eyes started watering. Just couldn't stay in there. Poisonous stuff I'm sure.

Usually come home and jump into bed next to the wife ponging of 2 stroke smoke.

Not sure why she smells like that. I guess it could be me.

Could be worse.. a 4T flogged real hard on the dyno will more likely give off an oil smell like death, too..


( & @ huhubug.. FYI - Frits is a disc valve fancier, surely..)

[41juergen]

If you are going to name your reeds, may i suggest Frits and Wayne?

That's a good idea! May be that will give the engine even a bit more power?

[Hemi Makutu]

Singh slots have been discussed before on here. I asked the question at the time "would you want a stream of oily unburned mixture squirted at the plug?" It went a bit quiet after that....
There is of course the possibilty of arranging them at an angle so as to promote rotation of the mixture - but I have no idea how that would impinge on the existing squish regime. On balance probably badly IMO.

What would you have ignite a nice oily mixture ( & an oily 16-to-20:1 gives best power, no?),

HCCI?

[rgvbaz]

Thanks to help from a few friends, Gigglebutton, Kel and Chambers the Team ESE dyno finally has an exhaust extractor.

TeeZee,

What fan are you using for extraction?

We need to get one for our dyno.

Cheers

Dave

[adegnes]

TeeZee,

What fan are you using for extraction?

We need to get one for our dyno.

Cheers

Dave

I'm using a gutted propane heater, works ok(for 50cc atleast).


I've actually got a proper exhaust extraction fan, but that's used for cooling. When I think about it my bike always seems to be "overcooled" on the dyno, might switch them around.

[Frits Overmars]

Shit wiseco.

I was pondering about a polite way to express my opinion but you made it a lot easier for me Neil. All I need to add is '+ 1'.

If you are going to name your reeds, may i suggest Frits and Wayne?

Frits is a disc valve fancier, surely.

Used to be, Hemi, used to be. Now it's 24/7 all the time .

By the way TZ, the extraction pipe looks great, but a bit too four stroke, needs a bulge in the middle.

Like these after-dinner pythons? (they even look hydroformed)