some technical vocabulary...

[English_Learner]

Hi there!

what's:

1/ power density
2/ charge dilution
3/ engine breathing
4/ residual gas trapping
5/ fuel composition

thanks :-)

[Thorin]

4/ I had some this morning, had to open the bathroom window for a bit.

[JamieP]

4/ I had some this morning, had to open the bathroom window for a bit.

Carefull ths is technical, you will get points:p

[English_Learner]

4/ I had some this morning, had to open the bathroom window for a bit.

lol :- D

I'm looking for a good explanation of the above-mentioned terms...

[Need4Speed]

They don't seem to mean much to us English speakers... are they American terms?

[Digsy]

Hi there!
what's:
1/ power density
2/ charge dilution
3/ engine breathing
4/ residual gas trapping
5/ fuel composition
thanks :-)

My best guesses:

1) Power density: Power divided by the engine size (also "specific power"). I.e 320bhp / 3 litres = 106hp per litre.

2) Charge dilution: Anything that dilutes the "burnable" fuel-air fixture on the induction stroke. For example: Blow-by gases and EGR.

3) Engine breathing: Could mean two things: (a) The intake and exhaust "gas exchange" process during the intake and exhaust strokes - that is, gas moving into and out of the comustion chamber. (b) The function of the crankcase ventilation (or breather system).

4) Residual gas trapping: Trapping residual (exhaust) gases in the combustion chamber, either intentionally by early exhaust valve closing (for "internal" EGR) or unintentionally through poor blow-down, reversion, big cam overlaps, etc.

5) Fuel composition: Not sure on this one. The chemical makeup of the fuel?

Hope these help.