Mobile Dyno-Jet Question....

Hammer

Hammer

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Jul 3, 2006
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Ok Let me see how to ask this.....

This had come up recently at our drag/dyno event with a couple of members and to be quite honest with you I have never given it any thought.Most mobile dyno jets are run with the noses in the down position at event like we had last weekend.It has been said there is no difference in power numbers with the nose up or down.

BUT....

Those owners who are dynoing their trucks and running big rpms have they given any consideration to where the oil pickup is located at in the oil pan.At rpms levels run with most trucks on the jet(3200-above),and knowing the oil pickup is located at the rear of the oil pan,does anyone feel they are on borrowed time when their rides are ripping into high rpm orbit and the bulk of their oil is in the front of the pan being whipped by the front part of the crank.

After thinking about it and pulling out my spare pan and oil pickup I'd have to think the nose down and high rpm could be a recipe for a disaster.This is not meant to upset or flame any of the mobile jet owners,its just a couple of us who wonder the thoughts of other owners on this subject???........Andy
 
Never thought about it but you make a good point. Dunbars it configured nose up.
 
I am sure if it was problematic we would have already saw some issues or differences..
 
I think that with such a slight incline and the fact that the oil level is not above the level where it will spill over the flat portion of the front of the pan (the oil returning to the pan will be filling the front portion and spill backwards into the sump) you are ok in terms of oil starvation, but you may experience parasitic loss due to the crank in the oil at the very front of the pan. Now is there any negative effects of the crank being in oil like that other than parasitic losses?
 
ours isn't configured nose up. all trucks are as level as we can get them.sometimes due to the various terrain,we are up a couple inches in the front.

mike
 
The pickup is fairly deep in the pan sump, so unless it's way nose down I can't imagine it being that much of an issue. The difference between "fill" and "add" is over an inch, so there's certainly some wiggle room there.
 
JP Jr....
Here is what I meant when I tried to describe the nose down attitude.Look at the photo in link and one can see the vast difference in height.Again,While I do of course realize no one has documented proof of any failure from rolling like one has to consider what could happen due to oil pick up locations.

The difference in height is great enough to starve the truck at higher rpm for oil IMO.Now,one has to remember mine has been rolled like this and it never occured to me or did I give it a second thought,until this was brought up in a discussion later in the day.What the long term effects would be no one knows yet but just in principle I would not do it again..........Andy

http://picasaweb.google.com/MDTDCTD...ilCountyDragwayShow/photo#5225107046936265122
 
Hammer said:
JP Jr....
Here is what I meant when I tried to describe the nose down attitude.Look at the photo in link and one can see the vast difference in height.Again,While I do of course realize no one has documented proof of any failure from rolling like one has to consider what could happen due to oil pick up locations.

The difference in height is great enough to starve the truck at higher rpm for oil IMO.Now,one has to remember mine has been rolled like this and it never occured to me or did I give it a second thought,until this was brought up in a discussion later in the day.What the long term effects would be no one knows yet but just in principle I would not do it again..........Andy

http://picasaweb.google.com/MDTDCTD...ilCountyDragwayShow/photo#5225107046936265122
Click to expand...

There are no issues with it, and no long term problems.
 
I always wondered the same question, but it seemed like if there was a problem with it, the problem would have already reared it's ugly head and/or MADDOG would be the one with the answer...thanks MADDOG!! and obviously no one has had any problems.

I think the nose down could cause the blinker fluid to leak out though, so make sure to check that after each run - j/k lol
 
I guess the question has to be asked, how many people dyno nose down? I know when I was on Dunbars he did not, and I also know that the guys at Backstreet Performance do not do there's nose down and neither do the guys at Axcellerated Motorsports. All of which are mobile 248s that I have been on
 
I think Dunbar had his configured nose up for a specific reason. I can't remember exactly why though. :doh:
 
jtharvey said:
I think Dunbar had his configured nose up for a specific reason. I can't remember exactly why though. :doh:
Click to expand...

our dyno is built the way it is,because it is much easier to drive the trucks straight up then backing them down the ramps.versus the opposite. when David first got it we had to back them up.no fun at all.it was immediately stretched,front and back to what you see today.

mike
 
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