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Old 01-16-2021, 09:34 PM   #1 (permalink)
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Rake Back to save MPG

Has anyone Lowered the back of a fullsize van(15 Passenger) to create a Kammback Profile? I think I could get approximately 3 with 6" drop on rear axle . This would Make the very Back of the van 8" lower. This May also improve the windshield angle. it would lower Back of the van. I would add air Dam and ground effects to clean up the airflow under the van. I also Plan on adding My 1 wheel Kamm Back trailer Behind it.

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Old 01-16-2021, 09:45 PM   #2 (permalink)
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A slant chop would have the effect you want.

A tail-dragger stance would IMHO add drag, unless there is a full bellypan.

The more general question would be forward, neutral or reverse rake.

edit:
There is ecomodder.com/forum/showthread.php/deep-blue-suburban-streamlining.



He is adding plan taper. I think it's more work than a slant chop. Last post in December.
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Last edited by freebeard; 01-16-2021 at 09:52 PM..
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Old 01-17-2021, 10:43 AM   #3 (permalink)
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Thanks for your thoughts. I was hoping to maintain the interior dimensions But wondered if a 3 slope would help or if I should try dropping it's total height by lowering the suspension. I definately want to clean up the airflow Underneath the van.
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Old 01-17-2021, 01:26 PM   #4 (permalink)
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Height does not equal frontal area.

Lowered with an air dam is the quick and easy solution; a full bellypan with wheel spats would probably give a better result.

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