Line Pressure???

Transmission to Rear-end

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mustangcobra438
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Line Pressure???

Post by mustangcobra438 » Mon May 23, 2016 2:53 am

1,200hp turbo sbf has ati puke tank and has a vent on the tail housing.
Every pass the car makes it pukes fluid out of trans from either the vent on the puke tank or possibly somewhere else.
Sick of cleaning underside of car every pass and eveb more worrid about getting oil under the tires.
Have bot checked line pressure yet but was wondering what can be the cause and solution for fixing this problem.
Aw46hyd fluid
Jw trans with 1.80 straight cut gears
Externally adjustable valve body

Thanks!!

Greenlight
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Re: Line Pressure???

Post by Greenlight » Thu May 26, 2016 11:11 pm

During a hard launch, a lot of oil can fill the tail housing area. That oil MAY cover the vent on the tail housing. Then it will only take a slight pressure in the transmission non-pressurized area (1.5 psi) to push the fluid up the vent line (1 psi will push the oil up about 28" or so). The higher the puke can the better. I don't know what transmission you have but a typical line pressure will be in the 180 to 220 psi range. The oil that exits the pressurized areas has a small amount of pressure that MAY cause the pressure in the non pressurized areas to build up when the vent is covered with fluid.

Once the "g's" decrease to less than about 1 or so, the fluid no longer covers the vent.

Try restricting the hole in the vent line to 0.080" or so and moving the puke can higher (if possible). Also, if the vent can be moved further forward on the tail housing it will help.
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mustangcobra438
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Re: Line Pressure???

Post by mustangcobra438 » Tue May 31, 2016 1:00 am

Thanks

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