Turbochargers design and related parts

johnboggs21 wrote:

the way i understand it, a turbo essentially raises your effective compression ratio.

True to a point. The piston and cylinder head will have the most effect on compression ratio. The reason FI does increase compression ratio (to a point) is the boost forcing more air then normal into the cylinder when the intake valves open.

johnboggs21 wrote:

The higher your compression ratio, the higher your cylinder pressure. Correct me if im wrong in my thinking.

Not always true. Like I said before, cylinder pressure is the force applied to the piston as it moves down. It has more to do with the fuel type and burn effiency then compression ratio.

Wow ok...






All this diesel talk is gonna give mean anurizum!! lol

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WTF!!!

lol.. yeah its been one of them days,, haha

You and me both man!!! Found out today that H1N1 is in my neighborhood and that 2 schools in my town have cosed for illness!! Been one of those days for sure!!!

this is what we have for closings ATM:
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merlin5577 wrote:

Not always true. Like I said before, cylinder pressure is the force applied to the piston as it moves down. It has more to do with the fuel type and burn effiency then compression ratio.

So your saying that the force of compression on a piston doesnt affect cylinder pressure? I understand that fuel type and burn efficency can affect it, but a high compression motor with something like a 24.5:1 compression ratio, the high compression does create pressure on the piston and cylinder. The air inside does not want to be compressed, and when its compressed it creates heat and PRESSURE.

Your turn my friend.

johnboggs21 wrote:

merlin5577 wrote:

Not always true. Like I said before, cylinder pressure is the force applied to the piston as it moves down. It has more to do with the fuel type and burn effiency then compression ratio.

So your saying that the force of compression on a piston doesnt affect cylinder pressure? I understand that fuel type and burn efficency can affect it, but a high compression motor with something like a 24.5:1 compression ratio, the high compression does create pressure on the piston and cylinder. The air inside does not want to be compressed, and when its compressed it creates heat and PRESSURE.

Your turn my friend.

I thought we where talking about the differences in pressure, not the presence of pressure. So yes, there is pressure in the cylinder during compression, thats a given. But, cylinder pressure during the compression stroke is WAY lower then cylinder pressure during the power stroke. Think about this, if I threw a cup of air at you, and a cup of exploding fuel, which would make you move faster?

I rest my case.

OK i understand what your getting at now. I have to agree pressure on the power stroke would definitly be greater.

Speakin of that i heard something to help me remember the 4 strokes today that yall might like.

Intake=suck
Compression=squeeze
Power=Bang
Exhaust=Blow

So, suck squeeze bang blow.

Thats exactly the way my professor told us so we would remember it!