Air Intake Under Bumper (Like Sled Puller's)

[Mactruck]

When I was at Muncie I saw alot of Sled Pulling trucks with their air intakes mounted under the bumper. My belief is that they do this to get their intake temps reduced by sucking air from the front, thus a reduction in EGT's. (correct me if I'm wrong )

I was wondering if their is a possible street use of these intakes. I realize rain water getting the filter wet would cause some restriction so a marine filter would be neccesary. But mounting a non-restrictive shield may deflect some of the water.



I realize alot of trucks ride that ride lower will be at a disadvantage to a system like this. However I'm considering this for vehicles with at least a leveling kit.



What do you think???

 

[Jim Fulmer]

I looked at that set up that he and dave are using and I have some data for you, if you have ever seen the way my filter is setup it points to the right corner from the big turbo, what I do have is an autometer dual probe air temp sensor with memory recall. I have one probe in the intake hat and had one by the filter and noticed during runs that the air temp at the filter was only around 20 degrees hotter than the outside air, I now have the probe actually in the air stream between the filter and turbo. Having said that, in testing seeing 400 degrees after the turbos I was seeing 120 degrees at the intake hat, now you do the math, 20 degrees isn't much at the filter intake. If you put enough filter on the turbo it will find the air it needs, also folks like Procharger that do wind tunnel testing on blowers see that most of the air comes from AROUND the turbo and not straight in to it. Remember the gasser guys putting turbo's in the bumper down low... ..... have you ever been to the track when the track temp was at 150 degrees and they are pulling air 1 foot off the surface... . hum! Air is easy, like our Twins, lots of it in volume, less restriction if possible, and cool temps, if the air is hot, cool it. I've dropped 70 degrees of air temp at the hat with water.



Jim

 

[illflem]

I can see the benefit for racing or sled pulling but for a road truck I would think a low intake would just turn into a dirt and snow scoop.