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K&N cone filter and piping.

1787 Views 6 Replies 6 Participants Last post by  Nellie
The premise of Diesel is that it runs more efficiently on a very hot engine, compared to a gas engine. So, is the heat soak from the engine with a uncovered cone filter really matter in a diesel? I know it does for a regular gasoline engine... I think it would make it more efficient if the cone filter was pulling warm air from the engine bay and airbox area.... Thoughts?
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From what I remember, this has never been clarified. While it is said that warmer air is better for a Diesel and combustion, I don't believe there is any in-depth proof. I don't own a Diesel so I can't test this out myself.
 

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A diesel uses compression and heat to ignite its fuel, so I suspect a hot air intake would not have any negative effect.

I've been thinking even my 1.4T would benefit from a K&N short ram in the winter time, so Instead of sucking -20F outside air once the engine starts to warm should be getting air 50F+ or higher. Think this would help with warmup times slightly but more so help maintain heat I have already made(currently I loose heat coasting down hills, in city driving or if the heater fan is maxed out at speed less than 75mph).
 

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Cold air is more dense, providing a more complete burn, more power. You still want cooler air with a diesel.
 

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hot air is a negative for a diesel cold air is way better you need to cool the intake temps
 
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