engine temp with deck lid open

[orangesuper]

Today leaving work I accidently left my engine lid open and drove about 20 miles before making a stop and realising. What I did notice on the drive though was that my oil temp was running about 15 degrees colder than normal. I have been told opening the decklid only interferes with vws design with the air scoops and actually makes the engine run hotter do to pulling in hot exhaust air via the vortex affect. I have all stock tin in place and all seals. I do notice that when working on the bus the horizontal part of the apron gets extremely hot from the exhaust header (cb performance quiet one). I think this must increase engine compartment temps considerably I bought some exhaust wrap tape today that I will put on this weekend to see if that makes a difference. anyone use that stuff?

[calebmelvin]

You can also try taking off the apron and making/attaching a heat shield on the underside to deflect some of the heat. General rules of thumb like running with the decklid open go out the window when your bus deviates from stock too much. You might be running a little too hot with your setup to begin with, who knows.
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Caleb
'68 Tagged Manx | My Wanted Ads
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[orangesuper]

my motor is pretty much stock except the exhaust and as of yesterday a maxi pump 3 with remote oil filter. I was thinking about adding a heat sheild or even just gluing some aluminium foil under the apron

[TRN9]

I have used the exhaust tape and over time it will just hold moisture and speed up the rusting process.
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'72 Panel ~ B-Bus
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Camper Special Club Member
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[borninabus]

i personally think that when you are "blowing" down the highway, like when you leave work and travel 20 miles, the more air the better. right? your engine is air cooled. under a load--as in driving around town, in traffic--the scoops and their location allow the engine to bring in (via the fan) relatively cool air and literally blow it over the beast and get rid of heat. just remember that Z Germans did an extremely good job at getting and air cooled engine to work at all! check out raby @ aircooledtechnology...(somebody)... i don't know how to post a link, but i do know how to keep a bus from cooking in lake havasu az and it's not hard.
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88 Van WBX, A/T - 13 JSW TDI 6M/T - 2012 Touareg TDI Sport

[udidwht]

I myself have heard from some pretty reputable ACVW guys that leaving the decklid (bus) cracked about an inch or so can shed as much as 10-15 degrees CHT temps.

[Desertbusman]

[orangesuper]

It does run a few degrees cooler with the full flow filter but not the drastic difference that the gauge showed with the engine compartment door open

[TRN9]

The air density could have also changed, changing the air/fuel mixture of your carb(s)
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'72 Panel ~ B-Bus
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Camper Special Club Member
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[El_Güero]

I leave the T4 theory out of this, but on a T1 pushing a bus, pop the deck lid completly open and you will find out that people who say it won´t help cooling the engine while continually runing, don´t know nothing about these beasts, just because it might not be legal to drive a car in the U.S with a door open, it don´t mean you got to go telling other people not to do it, on the basis that their engine will run hotter, yeah right... you might want to stop wasting money on those fancy CHT gauges and likewise and start knowing you vehicle better. Eaven the water cooled bays around here get the cooling efect from a engine compartment openden all the way, a lot of people around here would have a heart atack if they see this, or just think everybody else is stupid....

just my 0.20
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[TRN9]

[Wildthings]

Take a drive around Mexico city and you will see a high percentage of Combis running with their lids open. An open lid is also good to keep the local mounties from seeing what license plate number you have in case you are driving in the ciudad on the wrong day.

[El_Güero]

[El_Güero]

[deronmoped]

VW wanted that lid closed for some reason, they even sealed it up real good.

The only thing that jumps out at me is, if you leave the lid open the engine could be drawing in exhaust gases, road dirt/dust and hot air trying to leave from under the car. The reason I think this is, I see after driving my Bus for quite a while that the lid area gets dirty from exhaust gases...

Deron.

[deronmoped]

Come to think about it, the scoops for the engine compartment are purposely put real high on the Bus. Could be cosmetic, but they would pick up less road dirt and dust up there.

Deron.

[El_Güero]

[udidwht]

[greenbus pilot]