Supercharger Installation Cost
08-24-2009, 09:56 PM
#46
Instructor
Thread Starter
Join Date: Sep 2007
Location: Austin, Tx
Posts: 248
Likes: 0
Received 0 Likes
on
0 Posts
08-24-2009, 11:27 PM
#47
Drifting
Yes, missing the POINT entirely.
The more compression that is subject to intercooling the HIGHER the effective compression can become without the potential for encurring engine damage from detonation.
Basically this is also why the new Porsche DFI engine can run a 12:1 static/base/native compression ratio rather than 10:1 for SFI. Fuel depressurization/atomization/vaporization with SFI serves primarily to cool the intake runner, intake valve, and intake airflow, whereas DFI primarily COOLS the just previously compressed (and thereby HEATED) air.
DFI requires another new intake valve design beyond non-leaded gas..??
Toyota HSD Atkinson cycle engines have a static/base/native compression ratio of 13:1, reduced to an EFFECTIVE CR of 10:1 via delaying the intake valve closing. The latest designs use extended VVT-i to obtain an "effective" equal to static CR of 13:1 for low throttle openings and only switch to delayed intake valve closing mode under moderate to high throttle openings.
Shame they didn't yet "discover" DFI , 15:1 static, 12:1 effective.
How much is a Liter of LOX..??
The more compression that is subject to intercooling the HIGHER the effective compression can become without the potential for encurring engine damage from detonation.
Basically this is also why the new Porsche DFI engine can run a 12:1 static/base/native compression ratio rather than 10:1 for SFI. Fuel depressurization/atomization/vaporization with SFI serves primarily to cool the intake runner, intake valve, and intake airflow, whereas DFI primarily COOLS the just previously compressed (and thereby HEATED) air.
DFI requires another new intake valve design beyond non-leaded gas..??
Toyota HSD Atkinson cycle engines have a static/base/native compression ratio of 13:1, reduced to an EFFECTIVE CR of 10:1 via delaying the intake valve closing. The latest designs use extended VVT-i to obtain an "effective" equal to static CR of 13:1 for low throttle openings and only switch to delayed intake valve closing mode under moderate to high throttle openings.
Shame they didn't yet "discover" DFI , 15:1 static, 12:1 effective.
How much is a Liter of LOX..??
Last edited by wwest; 08-25-2009 at 12:02 AM.
08-25-2009, 07:25 AM
#48
Drifting
...why liquid oxygen? Did you mean 'NO2,? Wonder if nitrous (in manageble doses) is doable for the 996???
Yes, missing the POINT entirely.
The more compression that is subject to intercooling the HIGHER the effective compression can become without the potential for encurring engine damage from detonation.
Basically this is also why the new Porsche DFI engine can run a 12:1 static/base/native compression ratio rather than 10:1 for SFI. Fuel depressurization/atomization/vaporization with SFI serves primarily to cool the intake runner, intake valve, and intake airflow, whereas DFI primarily COOLS the just previously compressed (and thereby HEATED) air.
DFI requires another new intake valve design beyond non-leaded gas..??
Toyota HSD Atkinson cycle engines have a static/base/native compression ratio of 13:1, reduced to an EFFECTIVE CR of 10:1 via delaying the intake valve closing. The latest designs use extended VVT-i to obtain an "effective" equal to static CR of 13:1 for low throttle openings and only switch to delayed intake valve closing mode under moderate to high throttle openings.
Shame they didn't yet "discover" DFI , 15:1 static, 12:1 effective.
How much is a Liter of LOX..??
The more compression that is subject to intercooling the HIGHER the effective compression can become without the potential for encurring engine damage from detonation.
Basically this is also why the new Porsche DFI engine can run a 12:1 static/base/native compression ratio rather than 10:1 for SFI. Fuel depressurization/atomization/vaporization with SFI serves primarily to cool the intake runner, intake valve, and intake airflow, whereas DFI primarily COOLS the just previously compressed (and thereby HEATED) air.
DFI requires another new intake valve design beyond non-leaded gas..??
Toyota HSD Atkinson cycle engines have a static/base/native compression ratio of 13:1, reduced to an EFFECTIVE CR of 10:1 via delaying the intake valve closing. The latest designs use extended VVT-i to obtain an "effective" equal to static CR of 13:1 for low throttle openings and only switch to delayed intake valve closing mode under moderate to high throttle openings.
Shame they didn't yet "discover" DFI , 15:1 static, 12:1 effective.
How much is a Liter of LOX..??
08-25-2009, 01:20 PM
#49
Drifting
If DFI allows CR to be increased from 10:1 to 12:1 what do you suppose LOX, LIQUID oxygen, injected, vaporized, directly into the combustion chamber would allow....??
