Gary Vansleve
24th July 2014, 10:34 PM
For those that havn't read my last post I have gone water to air on my 06 4.2tdi. As the scoop is no longer required I have reversed the scoop to see if I can achieve some sort of airflow to get rid of some engine heat. Something like the A9X Torana and Chevy Camero and also of course the old hot rodders favourite raising the bonnet with some wedges to get that airflow effect.
After removing the scoop and rubber surround I find only two of the holes line up and the front of the scoop ( now the rear ie the closet to the windscreen) does not sit pround to the bonnet. At this point in time I figure this doesn't matter much as I am only fart arsing arround to see if the revsal has any effect.
Next I get a piece of paper towel and cut one side into fine pieces and then I stick it over the opening. I now have a birds eye view of what is goin to happen. Start the truck up and low an behold the fine meshed peice of paper towel flicks out to the windscreen. This is of course the engine fan pushing air out the vent. All good so far.
I start moving the truck and the paper towel flicks out a lot quicker lookin good reach 40 k and all of the sudden the paper towel flicks the other way indicating the air is now flowing back into the motor cavity not lookin good. After drivin for a while an reaching speeds of upwards of 80k the air is continueing to flow back into the engine bay this is not what I wanted.
I come back home and move the paper towel further into the scoop cavity figuring the air flow over the scoop might be having an adverse effect on things but alas this achieves nothing.
Have been driving for three days like this and the flow seems to work up to about 40k in speed then all goes to shit with the flow going back into the engine bay once speed goes over the 40k mark. I have noticed though the area in opening of the scoop closet to the guard (about a third of the opening) the flow seems to be comming out towards the screen when doin 80k. Go figure.
So summing up I think there is some benifit in what I wanted to achieve but I was supprised at how much flow was going back into the motor . I think there is enough merit in the idea for me to go ahead and make a proper install drilling some new holes to make it a flush fitting.
Cheers Gary
After removing the scoop and rubber surround I find only two of the holes line up and the front of the scoop ( now the rear ie the closet to the windscreen) does not sit pround to the bonnet. At this point in time I figure this doesn't matter much as I am only fart arsing arround to see if the revsal has any effect.
Next I get a piece of paper towel and cut one side into fine pieces and then I stick it over the opening. I now have a birds eye view of what is goin to happen. Start the truck up and low an behold the fine meshed peice of paper towel flicks out to the windscreen. This is of course the engine fan pushing air out the vent. All good so far.
I start moving the truck and the paper towel flicks out a lot quicker lookin good reach 40 k and all of the sudden the paper towel flicks the other way indicating the air is now flowing back into the motor cavity not lookin good. After drivin for a while an reaching speeds of upwards of 80k the air is continueing to flow back into the engine bay this is not what I wanted.
I come back home and move the paper towel further into the scoop cavity figuring the air flow over the scoop might be having an adverse effect on things but alas this achieves nothing.
Have been driving for three days like this and the flow seems to work up to about 40k in speed then all goes to shit with the flow going back into the engine bay once speed goes over the 40k mark. I have noticed though the area in opening of the scoop closet to the guard (about a third of the opening) the flow seems to be comming out towards the screen when doin 80k. Go figure.
So summing up I think there is some benifit in what I wanted to achieve but I was supprised at how much flow was going back into the motor . I think there is enough merit in the idea for me to go ahead and make a proper install drilling some new holes to make it a flush fitting.
Cheers Gary