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Message: [QUOTE="Tree Trimmer, post: 197842, member: 716"] on our demolition derby cars with roller 383's, we use header pointed straight up. to these headers, is a tube running from the top of the header to the valve cover. as the exhaust flows out the header, it creates a suction on the tube, this relieving any pressure in the crank case. its the same thing as the chimney on your house. air blows across the top, and sucks the smoke out. we have found, that if the angle of your bung is any greater than 30*, it will literally suck the oil out of the motor and spray it all over the car. we use about 15*. the manometer verified that this worked, as we ended up with about .12 psi of negative pressure in the case. we have since corrected this to have zero psi even. could the same thing be done on a turbo charged truck? the principle is there, but the additional flow through the exhaust from the turbo's is what i dont know. just throwing that out. carry on. [/QUOTE]

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