ESE's works engine tuner

[ief]

lol........

[Muhr]

Here some data Muhr

Thanks looks great!

I'm trying to get together a 100cc v twin.

Yep one barrel Ief

9.1 trapped

Like a 1,3-4 head?

Yep. Some more pictures of Nico's 50cc twin:
Attachment 334120 Attachment 334121 Attachment 334122

Is a amazing peace of mean machine

[TZ350]

Programming hmm?

Attachment 334128

........

[Askor]

.

I will be using the classic If/Then/Else routine in an endless loop.

If its fired Then do nothing Else activate the relay.

The first step is to be able to identify and refresh the signals then develop the application to discriminate between firing or not and activating the relay.

And at a total processing cycle speed of 200 hz all this should be possible.

Lookup a comparison of "interrupts" vs "polling". You're going to use polling to determine when there's a signal, using interrupts could/should be more reliable.

[jbiplane]

Hi Ief, those Engmod pics look rather familiar. You don't happen to be working on a Dutch 50cc twin, are you?

Carbon. It used to be hard to get, but nowadays you can simply order it: http://www.emot.nl/.

Thanks Frits. I have an experience to make reed petals of carbon. Will try to make disks of carbons and coated TiN steel and compare.

Other question. Can I use common tuning pipe? For inline this work fine, but for V... May be use headers of different length?
Could any software like Engmod correctly simulate exhaust behavior for 2 headers and common tuning pipe for different 2-cylinder configurations
(opposite, inline, V)?

[Vannik]

Still think there should be a dedicated forum for engmod....

https://www.kiwibiker.co.nz/forums/s...gMod2T-Q-amp-A

[Frits Overmars]

Can I use common tuning pipe? For inline this work fine, but for V... May be use headers of different length?

You can use a common pipe on a 180°-firing twin, on a 120°-firing triple, etc, but not on a 90°/270°-firing twin; not if you want any pipe efficiency.

[jbiplane]

You can use a common pipe on a 180°-firing twin, on a 120°-firing triple, etc, but not on a 90°/270°-firing twin; not if you want any pipe efficiency.

So on 2-stroke with common crankpin impossible make good (not excelent) muffler?

[Vannik]

So on 2-stroke with common crankpin impossible make good (not excellent) muffler?

If you are talking about a non-tuned pipe it is possible to make a good common exhaust, also if you have just two quarter wave straight pipes terminating in a common box will work. But this will be for a specific speed and for an UAV type engine where mass and space is a big issue. The UAV engines I worked on (Zanzottera and Limbach) had either a stub exhaust which was very noisy or two quarter wave pipes with absorption silencer included which was less noisy. You have to decide what is best for your application.

[jbiplane]

If you are talking about a non-tuned pipe it is possible to make a good common exhaust, also if you have just two quarter wave straight pipes terminating in a common box will work.

Yes, Vannik. "two quarter wave straight pipes terminating in a common box will work" completelly suit me. I want to get just one vital point - 20hp at 7200 rpm using Stihl 090 cylinders.
One 137cc cylinder stihl 090 with simplest muffler connected directly to cylinder without any header (piston driven intake) produce 8.5hp.

[Niels Abildgaard]

Yes, Vannik. "two quarter wave straight pipes terminating in a common box will work" completelly suit me. I want to get just one vital point - 20hp at 7200 rpm using Stihl 090 cylinders.
One 137cc cylinder stihl 090 with simplest muffler connected directly to cylinder without any header (piston driven intake) produce 8.5hp.

Bore 66mm stroke 40mm ca and 120 rps means a mean effective pressure of 5 bar to make 20 horsepower and a piston speed of ca 10 meter per second.
My MZ301 ran around 800 hours at PME 6bar and 11 meter per second and plug was changed once.Very long and happy life.

[Niels Abildgaard]

If you are talking about a non-tuned pipe it is possible to make a good common exhaust, also if you have just two quarter wave straight pipes terminating in a common box will work. But this will be for a specific speed and for an UAV type engine where mass and space is a big issue. The UAV engines I worked on (Zanzottera and Limbach) had either a stub exhaust which was very noisy or two quarter wave pipes with absorption silencer included which was less noisy. You have to decide what is best for your application.

Can we see a picture of a quarter wave pipe with silencer?
Please?

[jbiplane]

Bore 60mm stroke 40mm ca and 120 rps means a mean effective pressure of 5 bar to make 20 horsepower and a piston speed of ca 10 meter per second.

2 cylinders 66bore 40 stroke and common volume 274cc, but very short 73mm conrod. We made some opposites for paramotor use and 274cc heavy to start with pull starter on someone the back. And 7kg opposite have terrible torque vibrations on idle. We sucseed to get only 16,8hp...

So I want make V90 with common crankpin which will much more easy to start and still want to use OEM cylinders. I will make new crankshafts, disk valve intake, exhaust system, but complete engine should weight below 8kg.

I planing to simulate it in Engmod2t and Ricardo Vawe 2017 before production.

[Haufen]

When preparing a freshly cast cylinder for the first plating, is it advisable to put a bevel or radius at the end of the bore at tdc? What is this good for? From a combustion chamber point of view I don't like this idea at all.

But as the combustion chamber is going reach into the bore by 1mm anyway, this should not do too much harm. Would you have the same radius at the chamber to minimize trapped volume? I would like to do so, but suspect that the shape of the radius will have changed once plated.

[Niels Abildgaard]

2 cylinders 66bore 40 stroke and common volume 274cc, but very short 73mm conrod. We made some opposites for paramotor use and 274cc heavy to start with pull starter on someone the back. And 7kg opposite have terrible torque vibrations on idle. We sucseed to get only 16,8hp...

So I want make V90 with common crankpin which will much more easy to start and still want to use OEM cylinders. I will make new crankshafts, disk valve intake, exhaust system, but complete engine should weight below 8kg.

I planing to simulate it in Engmod2t and Ricardo Vawe 2017 before production.

Is it direct drive or belt-reduction between crank and airscrew?