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hansie Samba Member
Joined: August 29, 2007 Posts: 476 Location: Beach Lake, PA
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Posted: Tue May 22, 2012 3:31 am Post subject: Exhaust - HeaterBox Question |
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This may be a stupid question,but would it help to get rid of motor heat if you ran a type of tail pipe off the heater box out infront of the rear wheels ? Keep your heat on all the time and keep it moving off the motor. _________________ Karl Bower |
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50334
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Posted: Tue May 22, 2012 4:49 am Post subject: |
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Your system pretty much already does that. The heat is never "off" it is just not always directed into the cab. On '78 and '79 models VW did run pipes from the heater dumps to the bottom of the engine to get the waste heat away from the fuel tank, but later dropped the pipes when the tank was moved on the Vanagon.
If you keep you engine in tune and the cooling system in good shape, you aren't going to have any overheating problems anyway. |
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SGKent Samba Member
Joined: October 30, 2007 Posts: 41031 Location: Citrus Heights CA (Near Sacramento)
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Posted: Tue May 22, 2012 6:04 am Post subject: |
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in 1975 - 1978 VW changed the heat exchanger style to lengthen it which gave the exhaust more time to burn left over fuel. That is why the U is called an afterburner. In 1979 VW added an 02 sensor which raised fuel economy, power and HEAT. They also went back to the 72-74 style heat exchanger which moves the heat exchangers closer to the exhaust ports, and they added flat and wider flanges which could carry more heat away. Air blows across the heat exchangers all the time, whether the heat is on in the cabin or not. _________________ “Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin |
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Daverham Samba Member
Joined: August 27, 2009 Posts: 1397 Location: USA
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Posted: Tue May 22, 2012 11:37 am Post subject: |
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What year you working with? Not that it matters... Like Wildthings said, 78-79 did have "dump" pipes which are frequently missing from many buses. They look like an extra tailpipe just behind the wheel. Those did what you are describing, but earlier models pretty much did the same thing, just without the pipes. When the heater boxes are "off" they are just dumping the hot air outside, under the bus at the front of the heater box (at the control flap), instead of into the cabin. So it's pretty much already doing what you're describing - even all the way back to Type 1 engines. |
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