SLIC outside air flow pareto

[Jerryl]

So I looking at the shrouding of a SLIC and it got me thinking . . .
[COLOR=yellow ]The air flow seems to fit a pareto analysis, i.e; 80% of the flow goes through 20% of the IC.[/COLOR]

Has anyone ever complete an analysis of the outside air flow through the SLIC via the ram air/shroud?

 

[~JM~]

What you talkin' 'bout Willys.

~JM~

 

[mgmshar]

Great question. Seems like the bottom of the IC would get a lot more airflow than the top. But, I don't know for sure. Got some pitot tubes or thermocouples?

I also wonder the same thing when running with or without the little fan that bolts to the crank...

Mike
Sent from my HTC Droid Incredible using Turbo Buick

 

[DR BOOST]

What you talkin' 'bout Willys.

~JM~

Jeeps?

 

[DR BOOST]

So I looking at the shrouding of a SLIC and it got me thinking . . .
The air flow seems to fit a pareto analysis, i.e; 80% of the flow goes through 20% of the IC.

Has anyone ever complete an analysis of the outside air flow through the SLIC via the ram air/shroud?

it would appear that the inside airflow does the same thing.

 

[SPOOLFOOL2]

I don't have any data, but have played around with fabbing a more efficient shroud. I feel that there is worthy gains, for not much money.

Here's a link to what I did. Will try and hook up my Gopro camera under the car this weekend.
http://turbobuick.com/forums/threads/how-to-maximize-your-slic.305569/

Happy spooling.

Mike Barnard

 

[Jerryl]

Clarification;
I am NOT really looking for an increase in HP, as I know that the system works, especially with alky.
It is realized that "solving the puzzle" may result in an increase in HP, but that is not the objective of this discussion.
The objectove is to "learn something", and I am not really interested in discussing FM IC's.
There are 1,000,000 threads on that already, JUST on this board. LOL!
I am just wondering . . . . if the efficiency of a SLIC can be improved by equalizing the pressures accross the IC.

it would appear that the inside airflow does the same thing.

Well . . . since the air inside the IC enters at 90 deg to the flow path, I would say "no".
The outside air through the IC enters at 0 Deg (relative) and finds the path of least resistance, which is the bottom part of the IC.
So you get 80% of the airflow through a section that sees 20% of the heat.

If the SLIC could be layed down a bit (45-60 deg), I think the pressures would equalize significantly.
That is almost an impossibility, but that is what my gut feel tells me.

Great question. Seems like the bottom of the IC would get a lot more airflow than the top. But, I don't know for sure. Got some pitot tubes or thermocouples? I also wonder the same thing when running with or without the little fan that bolts to the crank... Mike.

I do not have direct access to measuring equipment , but . . . just MAYBE I can rig something up. (LOL!)
To be fair . . . It may not be the most scientifically designed experiment, but it would be interesting.

I don't have any data, but have played around with fabbing a more efficient shroud. I feel that there is worthy gains, for not much money. Happy spooling.

Mike Barnard

Mike,
I had seen your handy work and pictures of your car. I am amazed about your handy work and knowledge!
I am SURE your set-up works a LOT Better than the stock design. Thanks for sharing the info.
What I was wondering . . . . if there was a simple way to minimize the pressure drops across the IC.
I tried talking to someone about doing a CFD, but he is too busy with projects right now. (Imagine that! . . . . LOL )

 

[BIGONTS]

How but adding some fins (1-2) to distribute the air flow to the uppper part of the IC?

 

[Jerryl]

How but adding some fins (1-2) to distribute the air flow to the uppper part of the IC?

EXACTLY what I was thinking!

 

[Mike E]

Are you comparing the area available for air to flow through the core, or the pure area of the core( L x W). In reality the majority of the core is blocked by aluminum tubes and fins and there is little air space for air to actually move through the core. Same goes for the inside.

 

[Jerryl]

Are you comparing the area available for air to flow through the core, or the pure area of the core( L x W). In reality the majority of the core is blocked by aluminum tubes and fins and there is little air space for air to actually move through the core. Same goes for the inside.

You are correct. The area available for airflow is much less than the sq of the core.
If the IC inlet would be at the bottom, and the IC outlet at the top (Stock location), than most of the charge heat would be in the area that sees the highest cooling.

 

[RED LS1]

What your saying has already been covered before by Keith Mease. He builds an intercooler which is 24 row stock location stretch. The main shroud will draw air into the over all bottom half of the IC and it has 2 diffusers that are even adjustable which bring seperate layers of air directly to the middle portion and top portion of the intercooler.
This is a picture of mine which doesn't do the design any justice. the welds and quality of work are amazing but hard to see in the picture from the angle and lighting. I have munipluated mine a few different times because it was origanally built for a Turbo Iroc so it need to be redone under the rad support. I also refused to drive without a sway bar so more cutting for that....
Origanally, the whole shroud would be down a few inches to cover the whole core. I had to bring it up to work with the G-body. Again, this one was made for an F-body but GM High Tech did a whole article on a G body version when he first made it years ago.


It works good though. Intake air temps drop down to about 70* from 85 while cruising.

Here's the top side with no shroud. the tanks and tubing are all hand tig welded and fat tubing.

 

[Jerryl]

What your saying has already been covered before by Keith Mease. He builds an intercooler which is 24 row stock location stretch. The main shroud will draw air into the over all bottom half of the IC and it has 2 diffusers that are even adjustable which bring seperate layers of air directly to the middle portion and top portion of the intercooler.
This is a picture of mine which doesn't do the design any justice. the welds and quality of work are amazing but hard to see in the picture from the angle and lighting. .........

Here's the top side with no shroud. the tanks and tubing are all hand tig welded and fat tubing.

Very cool!
It would be interesting to read the article.

I have a Mease SLIC and it does not have the difuser.
That guy did some Amazing work!

 

[RED LS1]

It's been posted here before. Do a search and it should be easy to find. I'll get a better picture of the center of the dividers. There set up real nice and efficient.

 

[Jerryl]

It's been posted here before. Do a search and it should be easy to find. I'll get a better picture of the center of the dividers. There set up real nice and efficient.

This is the info I found.
Not a lot of mention anywhere of the difuser . . . .
Thanks for posting the pictures!

http://www.gmhightechperformance.co...ance_intercooler_test_calculations/index.html
http://turbobuick.com/forums/threads/24-row-mease-intercooler-results.103433/

 

[Grumpy]

Clarification;
I am NOT really looking for an increase in HP, as I know that the system works, especially with alky.


Isn't Alky answering your own question ?? Anyone do back to back tests with mods to the scoop ??? We have used old CAS V4s for years in the fleet here. only thing we did do was take the fan off.. Didn't make any difference if it were on or off. Went 138+ with it.. Have used it from stockers (12's ) to a little quicker(9's) . Didn't notice any difference with the scoop opened more on the bottom either.

 

[Jerryl]

Isn't Alky answering your own question ?? Anyone do back to back tests with mods to the scoop ??? We have used old CAS V4s for years in the fleet here. only thing we did do was take the fan off.. Didn't make any difference if it were on or off. Went 138+ with it.. Have used it from stockers (12's ) to a little quicker(9's) . Didn't notice any difference with the scoop opened more on the bottom either.

About time you checked in.
You shared some good info. Thanks you! . . . . .
I am trying to learn more about the pressure drop accross the face of the IC. . . . . in the different areas of the IC.
The process to gain understanding of this is MUCH more important to me than the 0-200 HP that may be gained.

 

[grocerygetter]

take into effect that your alky system is probably doing as much if not more than your intercooler. IMO...messing with the distribution of airflow across the IC is smart...but surface area/volume of the intercooler would be a more substantial upgrade. More surface to distribute heat wins. Honestly, FMIC wins in efficiency. There's no lag from a properly designed one either. I had zero negative lag change going from a gbodyparts SLIC to a Cotton's FMIC. Actually, above 20 psi, it spooled faster on the front mount.

 

[blackdeathtrap]

i took a 3 dollar rubber made garbage cant mounted it to the bottom of the shroud and curlled it up inside the stocker it pushes air flow up belive it or not drove 165 km yesterday it was 22 out car would barely graze 172 deg with ac on max were before i use to be grazing the 192 nearing 200 with max ac

 

[turbofabricator]

Jerryl, It IS the alky that is causing you way too many problems. See.......Drinking methanol is REALLY....REALLY bad for you. I know it's cheaper than Jack, but, Jack won't make you "think" too much. (except "think" that Rosie O'Donnell is really cute) Go back to drinking Jack Daniels and quit listening to Razor about using methanol. He means in your CAR, not your cup!!!!

Years ago I tired to get more air though the intercooler by installing a hinged inlet with light duty springs holding it up for normal driving. As speed increased it would over come spring pressure and open the inlet about 5" more. (verified visually) I had limiting straps to prevent it from going too far. It made zero difference. Easy to verify at the track by a installing a pin. I agree with Gumpy on the fan, too. Put a piece of paper in the inlet and rev the engine to see if it sucks it in. Not usually. Liquid to air.........now were talking. (expensive)

For the most part.........the intercooler in a drag car is nothing more than a heat sponge. It won't start transfering heat out of it until the very end of the track. Prior to that there just isn't adaquate airflow across the core. Heat has to build before it can dissapate. Thermal delta P. (is there such a thing?) You can read and read all kinds of engineering on thermal conductivity and other such brainiac stuff but you need a full bottle of Jack to really absorb that kind of info. And it seems that everytime I start understanding the formulas, someone like Grumpy goes out and BLOWS all those theories away. (but he cheats and has a girl drive the car)