whats this?

[bob tweedy]

i acquired an issue of car craft for nov 84.
in an article concerning the svo there is a picture of and a disertation on the intercooler. part of the article states that there is a 'marine fan housing'
ducted to the bottom of the intercooler housing.
there seems to be an extra flex hose going to the bottom of the intercooler.
can anyone expand on this.
bob

little boys wear bowties
big boys drive ford

[bendutro]

Just a way of ventilating cooler air to the IC. You can get 5" fans now that are better suited to the task of intercooler ventilation. Supposedly stops the heat soak feeling at stoplights.

[bob tweedy]

what

just for the sake of arguement and the fact that i cant feature this in my mind why would you duct cooler air to the bottom of the intercooler?
and where do you get this fan and what would you ask for?
you know i ve been fooling around with these cars for a while and until i picked up the magazine/article i have never heard of this setup.
bob

[SVOeric]

Bob-- we've discussed before, that at speed, air actually comes out of the SVO scoop -- so a duct under it run from somewhere up front, would allow cool air to run through it.

[fordracing89]

There is a plate on the bottom of the intercooler where I can only assume the fan would sit, I was actually pondering this on my Frankenstein.
Realizing that the intercooler is sitting right over the frigging turbo and we all know heat rises this seems like a possible effective alternative at least in town speeds to keep the air pushing downwards.

( My view so far) I would have to set the fan up as a puller on the underside of the intercooler Right above the turbo, I was trying to think of a way to shield it from the turbo but yet allow it to ventilate air out without trapping more heat.

[GAboySVO]

This is what I'm using on the Road Warrior. It is a recent addition and works ok thus far.

McMaster.com - 1939K71

[THESVOTRUST]

Ok

http://www.turbotbird.com/techinfo/IC_Fan/IC_Fan.htm

[Raven855]

Has anyone ever done any actual testing of how much air flow there is through the hood scoop? It can't be much. Does using a fan drop the temps down significantly or any with the stock IC?

[GAboySVO]

The fan I just put on only draw 130CFM. If after a spirited run, you turn off the engine and keep the fan on, the core temp drops substantually after 3 -5 mins to where it feels to be ambient temperature while the IC body is very hot to the touch. A fan as posted by Mark with 330 CFM would reduce the time to cool by quite a bit.

[Raven855]

I could see where a fan would be beneficial in slow speed driving in any location, stock or front mount. But what should the direction of the air flow be in stock location? Unless you are ducting cold air to the ic at all times, top or the bottom, I don't see how it is going to work.

[chalkys_explorer]

Slightly of topic but related.........I've often wondered if a tube running from the lower valance, say a fog light hole, into some pipe ducted to near the turbo/ exhaust manifold would have a positive effect on engine bay temp/ air charge/ exhaust temp??? Would probably look ugly as sin though.

[svodad]

fan cooled intercooler

OK, I just put a 7 1/2 spal fan on the bottom of my SVO intercooler. I used the guide written a few years back by Jeff Korn on the thunderbird site http://www.turbotbird.com/ . Now I've read a lot of rumors about air flow thru the scoop at various speeds etc. Well I believe there is nothing better then hard data. I hooked a velecity probe (small propeller type that counts pulses from blade rotation, reads out in fpm) onto the top of the intercooler and drove at various speeds. I did this 10 mph up to 50 mph. I have pictures of the meter, testing and fan if I could figure out how to post them. In any case at a stop, as everyone can feel with thier hand, air actually moves up in the wrong direction thru the intercooler from heat boyancy of the turbo and manifold. In short order the interncooler becomes an interheater. The new fan moves about 350 cfm with 1/2 inch wc drop thru the cooler. With the hood down and testing flow, the fan moves the same amount of air as driving 40 mph. There is no problem feeling the air pull thru the scoop while parked and fan fits over the intercooler support brackets without interference. I measured the airflow at the front of the scoop measuring the cross sectional area and the several flow measurements as well.

Ok now for the engineering. Assuming the intercooler is 80 or better % efficient, on any given day, the goal is to move about as much air accross the IC as the engine is pushing. If you calculate from HP the lbs of gas you need burn, times that by 14 or so, and multiply that up by lbs air/cubic foot (0.075lbs/ft# at 70F) you can figure the flow into the engine is upwards of 350 cfm at high hp. Therefore you want at least as much air passing over the IC.

So..... for $80 including the new fan relay and manual switch, you can make big improvements to the stock IC, now add some stainless steel heat shields over the turbo (not wraps that hold in heat) and you really got something.

Jim
ps. If you want to prove if the hood goes negative or not, simply run tubing from the top of the IC into a water column in the car. As you drive at various speed if the pressure (and therefore flow) reverse, the column of water will reverse.

[GAboySVO]

I did this 10 mph up to 50 mph.

Did you do any testing above 50 mph? What was the results? Flow in or out?

[Raven855]

I would like to see your results at 50 and above also. I have an old manometer at home and this was one of those things that I wanted to test. Actually I have been wanted to pick up one of Dwyer Magnehlic gages, they go for cheap on the evil bay...

Mike, if I paint the IC red and make it faster, does the air move across it slower or faster? If the air is moving slower are my temps going to be higher and hotter making me slower, er the IC slower? If the IC is faster and the air is faster, will I be faster? Maybe a nice hot pink or some Cheby orange to slow it down abit? Guess this shows where the slow part is...

[DAVEZ84SVO]

Sounds like a good topic for an evening reunion discussion!

Sounds like we will be doing a lot of discussing at the reunion.. I'm bringing a note pad so I don't forget everything by the time I get home..

Dave