High compression turbocharged engines.


Kozy you should be workin in MIT or building engines for F1 with your knowledge!! Lol
 
Nah, I might be wrong for all I know, I just say the things I do with enough conviction, a myriad of numbers and pretty graphs to convince everyone I know what I am talking about. Bullshit baffles brains and all that... :D

These models are not complete anyway, I still need to incorporate valve timings and cylinder wall heat transfer (just an assumed constant at the moment) before they can really be given proper credit.

That said, the info they gave me was good enough to prove someone wrong, who had been paid a lot of money to create something similar for an OEM. I won't lie I was pretty smug when he came back and admitted that after arguing with vitriol that I was wrong, he was proven wrong by his own software. :dance:

Hopefully it'll go somewhere some day and I can escape the drawing office... :nice:
 
Firstly I must apologize I haven't really read all this thread.
But we made 450hp on a B16 with high comp pistons in it. (N/a forged). It was on pump fuel. I don't know the exact CR as we didn't build the engine, but it was certainly over 12:1.
 
Ricky@Race-Tech said:
Firstly I must apologize I haven't really read all this thread.
But we made 450hp on a B16 with high comp pistons in it. (N/a forged). It was on pump fuel. I don't know the exact CR as we didn't build the engine, but it was certainly over 12:1.
Click to expand...

Sleeved? Did it last long? Who mapped it? What rollers? Road car? ..............
 
Ricky@Race-Tech said:
Firstly I must apologize I haven't really read all this thread.
But we made 450hp on a B16 with high comp pistons in it. (N/a forged). It was on pump fuel. I don't know the exact CR as we didn't build the engine, but it was certainly over 12:1.
Click to expand...

Would you be able to share any more details?

What torque figure did it put out? How much boost?

How much ignition advance you were able to use?
 
I'll pull up the details.

The off boost torque was good. Obviously on boost wouldn't be massively different from another 450hp turbo car. (lower if anything)

You would gain more from changing cam's. I.e. Moving the power down the RPM range, or massively more from changing to a better turbo.

A high comp B16 will perform like a low comp B18 off boost, (roughly) so you have an approx 10% increase in torque off boost. But who cares about off boost.

It was open deck. Lasted fine in that respect. It wasn't built by us and some of the clearances weren't correct. However the pistons and bores were in perfect condition afterwards.

That said, I wouldn't advise it, and it will be a much more "volatile" engine. Should something differ slightly, I.e, fuel quality, things will come to an end very quickly.

Kozy said:
Would you be able to share any more details?

What torque figure did it put out? How much boost?

How much ignition advance you were able to use?
Click to expand...
 
Haha, that's a shame! :D

Best off to set the geometry to the same and have a look at the effects of compression ratio, boost pressure (BAR) and ignition timing. :blinx:

Lots more improvements in the pipeline for this, only got a 'factor' for thermal effeciency at the moment, which I want to replace with actual heat loss through cylinder walls etc.

Add in valve timing effects on cylinder pressure.

Add in head flow data and cam specs to determine breathing capability. Got this on another spreadsheet, which seems to work quite well.

Once this is done I should be able to get it to plot a virtual dyno curve of the entire rev range. :)
 
Last edited:
So I have just turboconverted my civic and this became more interesting right know. In post #36 you specify that the ignition timing is set to 45 degrees. What does that acutually mean? because in my hondata map its only retarded to about 25 degree before boost(col 10).
 
Merely a comparison between the two ignition timings. It is not to suggest that either is reflective of reality. ;)
 
Have you stuck your details in the calculator vs a standard NASP engine?

Here's what I'm getting:



Around 158lbft/225bhp if it's a B16?
 
Last edited:
Ah OK. Graph shape is the same but with a longer scale on the volume axis.
 
I have just read 5 and a bit pages of f**k knows what haha, very interesting read, don't think I understand some of it but interesting none the less.
 
Just realised the link I posted to my engine thermo calculator is not working:

Here's the current one: Black Art Dynamics - Engine Thermodynamics

The default inputs are close to a K20.

User inputs:

Engine geometry: Bore, stroke, rod length, compression ratio, IVC timing and RPM.
Air Fuel Ratio and Ignition timing
Volumetic efficiency and boost pressure.

Tells you:

Torque & Power
Specific Torque and BMEP (Corrected for boost)
Maximum RPM limit
BSFC & Fuel Rate

Mean & Max Piston Speed
Max Piston Acceleration & Wrist Pin Force at TDC

Peak & Average Gas Temp
Peak & Average Gas Pressure
 
Doesnt matter now with the new Hybrid Turbo's which will no doubt render N/A tuning a thing of the past.
 
You must log in or register to reply here.
Back
Top