EngMod2T Q&A

[Vannik]

Not changing the pipe temperature method will give the same answer as before.

The biggest change was in the turbulent combustion model mass preservation coding. Before it could burn more mass than was there - obviously not right.

[41juergen]

Ok, got it, thanks a lot.

Just another "wish": it would be good to have a second y axis in the dat evaluation graphs, e.g. to show the power curve on the left (with a scale e.g. 20-50 kW, depending on values) and on the right side the deto's or efficiency factos (with a scaling e.g. 0-2).
I assume that would request some seriuos changes in the code, right?

[Vannik]

Yes, but already halfway there, the PV graph has it by default.

[Vannik]

I am working on a utility to show a schematic of the transfer port passages as many still get it wrong. Below a picture of where I got to over the weekend. It must still be corrected to use the same horizontal and vertical scales. Anything I should add? Any other ideas?

[sispeed]

Looks good. Can't wait to see my model with this new view
Regards Siggi

[41juergen]

Just another suggestion: have you ever thought about creating emission data as an output (e.g. mass flow in g/sec)? I know that most of the users don't need that, but for working on road going bikes it would be a perfect input for a catalyst design software...

[Vannik]

Yes, I have and plan to also add basic catalytic converters sometime in the future.

Currently I am working on a duct element that can simulate the increase in flow volume and the dropm in temperature as the result of NOX injection.

[Vannik]

I posted more small error fixes today, if you did not get the notification please email me.

It also adds a contra rotating crank engine layout option.

[peewee]

would it be feasible without much trouble to add a print function ? seems like this would be helpful especially when setting up a new engine for the first time. you could print off the pages and take them in the garage and fill in the data boxes then return to the computer and type in all the info.

[Vannik]

would it be feasible without much trouble to add a print function ? seems like this would be helpful especially when setting up a new engine for the first time. you could print off the pages and take them in the garage and fill in the data boxes then return to the computer and type in all the info.

Are you asking for something similar to the 4T version?

[peewee]

yes that looks like it would be great. then the pages could be printed blank and the data boxes filled in with pencil in the garage then transferred to computer later. I don't know how much trouble it would be for you however

[Vannik]

I have just released an update. Make sure you received the update links.

Next I will see about creating a blank document for manual completion when measuring.

[Vannik]

yes that looks like it would be great. then the pages could be printed blank and the data boxes filled in with pencil in the garage then transferred to computer later. I don't know how much trouble it would be for you however

Found an old one. Is this ok or do you need it updated?

[peewee]

Found an old one. Is this ok or do you need it updated?

old one will be fine

[Vannik]

Released an update. If you did not receive notification let me know please. Spam filters are overactive sometimes.

Summary of Major Updates to 2T Suite
9 August 2019

There has been some major updates to the software since the last official release. Twice in the last 6 months a new release was just about ready before being interrupted by either refinements or additional functionality.

• Short Summary of Major Updates:
• Updated pipe junction model
• Updated turbocharger and supercharger model
• Adding an opposed piston two crankshaft option
• Adding a tandem twin engine
• New Uniflow scavenging model and dialog box
• First version of poppet exhaust valve to model a Uniflow engine
• Extra output in the power output file, this will automatically create a new power file
• More options in the compression ignition model
• An ignition curve generator was added, use with caution! It is only meant to get started
• General small bug fixes and improved robustness

Read the detailed description of the new pipe junction model in Dat2T Help first before using it. It is quite different. The old one will still work though. This is applicable for 3-pipe junctions as used in ATAC, boost bottles, wastegates, T-pipes and internal stingers.

The first time a full run is done on an existing model with the older version power output file the older version will be renamed and will still be available for opening in Post2T while a new one with the extra headers will be created.

The poppet valve addition is not yet complete so only the generated lift profile is active, VVT, imported lift profile and flow bench created Cd maps are not yet working. They will be added over the next few months.

It is no longer possible to test all available combinations or permutations so please report any issues!