ESE's works engine tuner

[marsheng]

I'm going to cut up my spare barrel tomorrow so I can verify my port measurements and hopefully get a more accurate model.

Use a 2 part silicon potting mix to copy the ports. Much better than cutting a barrel open. !!!

Cheers Wallace

[Sketchy_Racer]

Use a 2 part silicon potting mix to copy the ports. Much better than cutting a barrel open. !!!

Cheers Wallace

Normally I would agree, in this instance the barrel is beyond economic repair so it can be a offering to the gods of speed

[Sketchy_Racer]

Do you understand how to input the correct numbers for your actual combustion parameters, as this is very important to detecting, then eliminating deto.
If not I will do a show and tell as TeeZee likes.

Please do, I'm eager to gain a better fundamental understanding of the software and how to most accurately use it. Much like FEA i'm sure with enough fudging you can get it to say whatever you would like it to.

[wobbly]

Dont mention the word "fudge" or Neels will cancel your software licence , he hates the word with a passion.
OK, so here we go with getting the correct combustion parameters into your sim.
Firstly be aware that the squish geometry is one of the inputs that the code uses to generate the parameters that govern the combustion numbers.
So this must be optimized or at the very least close to what the engine is/will be running.
Firstly enter the combustion page with the default entries - I have shown that page for the TZ400 engine, along with the actual ignition timing.
Then run the sim, and if you get any obvious area of deto at one rpm point, then that can usually be fixed by pulling some timing.
If on the other hand you get deto all over the shop, then something is very wrong with the compression for the fuel entered, or the stinger is way too small.
What I am saying is get the sim working reasonably happily initially, using the defaults and Burnrate Prescribed.
Then - change to Turbulent Model with the current setup and save that Combustion change - but you dont need to rename it.
Run the sim, and call that run say TurbMod,this will take forever, as its now actually calculating what is happening in the chamber.

Once its done open the Post Processor,and select Performance and Efficiency.
Open the engine files you are working on, and select the last sim run called TurbMod,now the page with the parameters you want to be looking at will open, and
on the RH side is a Write Combustion File radio button.
Click that and enter a new name for that file, like in my case TZ400 Reed TurbMod, and enter the other parameters needed.
This will then save to the 2Stroke folder with that new name.
Then when you reopen your EngMod Dat2T engine sim, you can select Existing Combustion Data, and select that newly named file.
This will now have all the correct Wiebe functions etc for your setup.

Very occasionally the new file will crash, due to one of the calculated numbers being out of range ( like duration at say 100+ on one line ) if so ask Neels to look at your packed up file.
You are not annoying him, as seeing the error helps him refine the code each time to prevent it occurring in similar circumstances.
Now you have the correct numbers, you can save the file with Burnrate Prescribed again, and it will now run as fast as before - just alot more accurately.

[crbbt]

I would also like a thermostat Wob

[Brett S]

The Italians make bypass thermostats for karts at 45deg cheap.
Dunno if pipe sizes are correct for your application.


Righetti Bypass thermostats

[chrisc]

Would like to buy two as soon as you have them available.

I now want two please .....

I'm pretty keen to get one for my RS125 Wob and I think one or two other 125 riders I race with might be keen also.

The Italians make bypass thermostats for karts at 45deg cheap.
Dunno if pipe sizes are correct for your application.

Righetti Bypass thermostats

Any idea on the price of those Brett?

[Brett S]

I just had a look and the americans are retailing them for $85US, with the NZ and AU dollar being worthless again not as cheap as i remembered.

So maybe best to give the work to Neil and fund his experiments

[Frits Overmars]

Any idea on the price of those Brett?

You will find bypass thermostats here for €72,60: http://www.hvg-engineering.com/index...al=thermostaat

[ief]

Wob, tnx! (again!)

[Frits Overmars]

Use a 2 part silicon potting mix to copy the ports. Much better than cutting a barrel open.

Use Vinamold. Much better than messing around with two-component stuff. Vinamold is meltable and reusable. The red version is ideal for duct copying.

[Tim Ey]

+1 Vinamold

Anyone got a source for CFK which is suitable for reed valves? The only source I got at the moment are the Polini plates - but they are quite expensive compared to other CFK plates on ebay...

Cheers
Tim

[nasone32]

I want to share this exhaust rescaler i made some time ago.
very useful for engmod.
You want to try an aprilia rsa exhaust on your engine? or the honda rs one?
easy!
you put in the data of the original engine the pipes come from, and the data of your engine, and it spits out the corrected geometry, as a good starting point.
Of course it works better for engines with similar state of tune.

It does not take into account the lenght and diameter of the exhaust duct in the cylinder, some manual tinkering required here.

the data already provided inside is aprilia tubo 102

I wrote it with an italian version of openoffice, please check it and report, as it uses RADQ() instead of SQRT() to make the square root function.
EDIT: now it uses elevation to 0.5 to make the square root. there is still the comma/point issue as decimal separator, please check if it works for you.

exhaust rescaler3.xls

[2005bully]

+1 Vinamold

Anyone got a source for CFK which is suitable for reed valves? The only source I got at the moment are the Polini plates - but they are quite expensive compared to other CFK plates on ebay...

Cheers
Tim

Seems that internet searching for carbon fiber sheet mainly brings up cosmetic products. Try searching for FRP, and or G-10 sheets, that should get you some business's that also work with industrial carbon fiber sheet. Here is a link to an aerospace based company that I have had excellent results from...
https://www.acpsales.com/Fiberglass-Sheets.html

Hope this helps.... Kermit Buller

[adegnes]

Various carbon fiber products here
http://www.easycomposites.co.uk/#!/c...lat-Sheet.html

Not the widest selection of sheet thicknesses.