I was thinking about modelling the stock twins including all the solenoids and actuators in some system design software I have available to me. Before you ask, I'm mostly doing it to learn the software. If it turns out really well, it might work for

Can anyone provide some information on the flow characteristics? Intake charge temps before and after the intercooler? EGTs? Does the Corky Bell book provide calculation methods to estimate it?

Dave

 

Corky's book has a lot of good info, but I don't think the formulas in his book will apply to the rotary. For example, the one to estimate your engine's CFM requires that you know the displacement in cu in. That's not hard to get, but we all know that the rotary is more like a 2 stroke than a 4 stroke in terms of air consumption.

Corky's book would be a good start and the cool thing is that he responds to e-mail. You could probably just e-mail him and ask him how to adjust the formulas for a rotary.

It's been awhile since I e-mailed him, but iirc, his e-mail is: corky@bellengineering.net

Sonny

 

Dave,

What kind of modeling s/w is it and what exactly is it going to demonstrate?

I might be able to help. I've calculated as well as empirically determined a number of parameters that might be of interest to you. Some of the data you seek could be specified as a single data point, a range or as a function... Hmmm. Perhaps you can give a bit more of an outline and I'll try and find my notes.

Joe

PS: I got your binary riddle, but don't you digital guys often use 00 as the first place (as 1)? I thought so... I often did during the course of digital circuit design. So I guess that could mean that there are 01 types of people in this world!

 

Joe, I'm not really a digital guy - but isn't what you're referring to as big-endian vs. little endian?

The modeling software I'm thinking about I have no experience in - it's Dymola - a system level pneumatics simulation software. The idea is to simulate the turbo control system, and the data I'm missing is the basic behavior of the engine. I don't know what phenomena will be important, since I don't have much background in engine behavior and the effects of turbos.

It would be cool because if I got a half-decent model of the system, 1) I'd be a whole lot better with this type of mechanical system (a benefit for my work), 2) it would be a great visual to explain how the turbo system works and 3) it could simulate turbo system failures and maybe helpful in diagnostics.

Dave

 

That's a pretty neat idea! It would actually be kind of cool to have a model of just the pneumatic control system for the turbo that you could play with - be good for people learning the system. You could change the RPM's and watch the various solenoids and actuators go.

Would be even cooler to have it so you could fake failures (say, pop off a vacuum line or have a solenoid fail) and see what happens.

That would be fiendishly complicated to make go, however .

Dale

 

Yeah, that's the pie-in-the-sky idea motivating me. Since most the system in binary pneumatics, the tricky stuff will be engine behavior and duty-control simulation. It would probably be good if the engine response was simplified to only WOT conditions, and I might have to back into the numbers that produce realistic duty-control behavior. But still that's a lot harder than it sounds.

Dave

 

this is an uber cool idea, and if you could pull it off many many people would thank you and have fun learning the ins and outs of our turbo system... if you were able to complete this, how could it be made availble to us (the lowly peons who just want to play with your cool program)? would we need the software you use, or can it be converted into some sort of applet format that would work on the net? or an exe that you download? sorry its been a very very long time since i touched any computer programing.... and im sort of out of the loop at this point. good luck!! -heath