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#1
06-16-2006, 08:48 PM
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negative pressure zone at rear of 300td?
i just finished a 350 mile trip in brownie. i started the trip with a full tank of home brew bio d. during the first half i noticed and mentioned that the rear glass was getting dirty as we drove. at the half way point i looked at the hatch and glass and sure enough there were tiny bubles of moisture on the surface. i put in a few gal of bp diesel before heading home and the rear windo wcontinued to become opaque. the exhaust pipe tip it ends several inches before the bumper.
i know that some minivans have a wing at the rear to direct the wind over the rear glass to keep it clean due to a neg press area. is this what is happening to brownie? i went out with some dawn and 2 gal of water in a bucket and washed it off. there was the slick oily bio and grimey black stuff prolly from the bp fuel. how close is everyones exhaust tip from the bumper anyway?
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currently [1981 300 td tdidi 165500 dark brown/palamino-Brownie-mine-3k miles of ownership 1983 240d 162+++ Anthricite grey w/ henna red interior and hella lights-wifes car-Red the above two cars are for sale and can be seen on the cars for sale thread here. pix also available. 240d-144+ Manilla Yellow w/ palmino interior-greasecar kit-Blondie-the college kids car 23" gt 21 speed still on original tires-still got the nubs 21" khs tandem Last edited by 83-240D; 06-16-2006 at 10:27 PM. 
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#2
06-17-2006, 01:01 PM
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transportdiesel drivers any similar experiences? the exhaust tip is just between the bumper and body.
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currently [1981 300 td tdidi 165500 dark brown/palamino-Brownie-mine-3k miles of ownership 1983 240d 162+++ Anthricite grey w/ henna red interior and hella lights-wifes car-Red the above two cars are for sale and can be seen on the cars for sale thread here. pix also available. 240d-144+ Manilla Yellow w/ palmino interior-greasecar kit-Blondie-the college kids car 23" gt 21 speed still on original tires-still got the nubs 21" khs tandem
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#3
06-17-2006, 01:47 PM
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There is a low pressure zone at the back of the TD. I cound never keep my hatch clean no matter how much I washed it.
In some ways, it helps MPG by allowing air to cleanly flow over the body. Much like keeping the up tailgate of a pickup makes a low pressure area in the bed.
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#4
06-17-2006, 02:17 PM
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fi have you changed the position of the exhaust tip or left it the same?
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currently [1981 300 td tdidi 165500 dark brown/palamino-Brownie-mine-3k miles of ownership 1983 240d 162+++ Anthricite grey w/ henna red interior and hella lights-wifes car-Red the above two cars are for sale and can be seen on the cars for sale thread here. pix also available. 240d-144+ Manilla Yellow w/ palmino interior-greasecar kit-Blondie-the college kids car 23" gt 21 speed still on original tires-still got the nubs 21" khs tandem
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#5
06-17-2006, 02:40 PM
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Quote:
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#6
06-17-2006, 06:25 PM
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Blowby is what comes out the tailpipe along with the normal soot and gets puilled up by the negative pressure (vacuum) that exists because of the shape of the rear end of the TD. It sounds like you have a lot of ring wear.
A deflector might help.
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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!
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