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proxlamus©

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Posts posted by proxlamus©

    Turbo Intake Plenum

    in Fuel Delivery

    Posted

    the swirl effect in intake systems is designed to better atomize the air/fuel for a more efficient burn and prevent detonation.

     

    alot of the V8 guys have "swirl valves" which allow the air to swirl into the cylinder for better atomization. nameless examples of engines could use the swirl valve, or a variable intake design where the end of the runner creates a swirl before it hits the valve.

    how bad do I need a steel head gasket?

    in Turbo / Supercharger

    Posted

    Paper is the best gasket to use honestly.. consider a head gasket as a FUSE.. too much cylinder pressure or detonation and POP the air is expelled and no damage other then a few hours of work and $$.

     

    Metal won't pop.. they are pretty much permanent.. so if you detonate.. your pistons or valves or rods feel the damage.

     

    But if your running really high cylinder pressures with alot of boost safely and the paper head gasket is designed to blow at lower pressures then a metal one may be necessary.

    Turbo Intake Plenum

    in Fuel Delivery

    Posted

    I havent taken a thermo class unfortunately.. so I may have to look into that more..

     

    All i do know is the Total Pressure at the inlet is 14.7 psi while the Total Temp (F*) is 59* on a standard day on the JT8D. By the 13th stage the total pressure is 233 psi as the total temp climbs to 800* F.

     

    i dont know why staged compressor blades would

    reduce the total amount of entropy (and thus efficiency)
    . It seems that staged compressor blades would INCREASE efficiency and not reduce the efficiency?! Obviously HEAT is the energy.. and building the pressure and heat up more and more would increase the heat output therefore producing more thrust?!

     

    anyway... NO on the VG's in the intake tract

    Turbo Intake Plenum

    in Fuel Delivery

    Posted

    Has anyone thought of using vortex generators in the intake manifold? Since it "works" improving the aero of the Z body shouldn't it work in the intake tract?

    With the VERY high velocity they may be able to be used to create a counter-rotation that could cancel out the vortecies all-together. Have I injested too much bad cheese or does it make sense?

     

    I think the idea of a intake-tract set of vortex generators could create a counter-tornado that could work.

     

    I have talked to my aerodynamics and aircraft performance teachers in great lengths discussing the idea of vortex generators on the inlets of turbo jet engines..

     

    the universal answer is = NO

     

    In a reciprocating engine you want as much velocity as you can get.. while a turbo jet engine you want as much pressure as you can get... (in the inlet)

     

    For example.. turbo jet engines such as the CF6-6 engine in the DC-10-10 have 16 stages of compressor blades.. the more pressure on compressor section one.. the more the total output is after the 16th stage into the combustion chamber..

     

    As for an reciprocating engine.. you want a great velocity down the intake stream to fill the cylinder up with air as quickly as you can. This can be done by creating a high velocity intake stream to slam into the intake valve while its closed and build pressure while in addition allowing fast flowing air into the cylinder. As the air fills into the cylinder, the area from the intake runner and cylinder head to the cylinder greater expands.. slowing the airflow and building pressure.

     

    The other idea for providing power in a reciprocating engine is creating loads of pressure (turbo/supercharger) and the high pressure air will flow quickly into the cylinder as the intake valve opens. (high pressure always always flows to low pressure). Obviously you need high velocity air when the turbo is not producing boost for off boost performance. IF a reciprocating engine was always under pressure obviously this would be the best setup. This obviously isn't the case in any engine I know of.

     

    Adding vortex generators simply extends or thickens the boundary layer.. which lowers the overall diameter of the pipe/plenum. This will increase the velocity and decrease the pressure (bernoulli). The problem with adding vortex generators to stop the "tornado" would increase and decrease pressure in odd locations in the plenum. This would also redirect the fast moving airstream. Now your looking at a low pressure chamber with lots of swirling fast moving air without a direction...

     

    I dont know if I can write *my understanding* down in words.. but let me know if i'm off a bit.

    L series - Positive crank case pressure, too much.

    in Nissan L6 Forum

    Posted

    I should probably post a FIX to this problem from my experience..

     

    I simply added an inline PCV valve and this fixed the problem!!

     

    I added a vacuum tee from the brake booster line.. and added the inline PCV.

     

    block vent tube > hose > PCV valve > hose > vacuum tee to intake manifold!

     

    I ran the setup OPEN for one day to see what happened and the smoke poured out! I hooked the valve back up and NO smoke! I never need to refill my oil now! whoo!

    Speedometer failure.. where to buy new cogs?!

    in Drivetrain

    Posted

    hey guys..

     

    recently my speedometer stoppepd workin on my '78 280z.. after checking the connection on the transmission and the speedometer guage everything is hooked up properly.

     

    I am assuming maybe the speedometer cog went out, or the transmission is not spinning the speedo cable.

     

    The speedo and the odometer are not functioning which is what gives me the impression the cable is not rotating. The odometer is a gear reduction and the speedometer needle/display is seperate from the gear reduction.. thats why I came to this conclusion.

     

    Anyway!! i know people mention diff teeth speedo cogs and diff colors.. but where do you buy them?!

    Turbo Intake Plenum

    in Fuel Delivery

    Posted

    damn im impressed with all this research!

     

    tell me your considering a small production run?!

     

    excellent use of diverters and the bumps to stop the swirl.

     

    You may also consider using various sizes and angles of airfoils to manipulate the velocity and pressure in problem spots

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