fabbed up cooling shroud

[CLKWRK]

Hi all,

last year i fabbed up a shroud for my 911 fan, here are some pics for everyone to review any suggestions or constructive criticizm are welcome.

basically i made it bolt in as a replacement for a type 1 shoud, I am not running an oil cooler in the stock location, it is at the front of the car since i am running a dry sump system. The engine is apart now, but i intend to run the stock warm up flaps and thermostat.

Bry

[zen]

will you be running dual CHT or something to judge the performance of the shroud? i am far from an expert, but looking at how Porsche handled the air coming off the front of the fan, i suspect you will see some issues. you have a vertical divider which i would think will starve the right side since the air wants to work around in a clockwise motion. Porsche used a cone on the front side of the fan, to keep the air swirling i assume. i would think you need to move that divider further away from the fan.

just my amateur 2 cents. i'm sure there will be some more accurate assessments coming. considering the amount of air flow study Jake has done over the past year with the T1 DTM and the 911 shroud testing, he could probably add some valuable input as well.

[Sandeep]

Bry,

I always wondered how you made that 911 fan fit the T1 cylinder tin

I have a datalogger that I built that could be used to monitor the temps, but you'll have to supply the TC's, could discuss at the April meet.

I have taken a closer look at the inside of an original 911 shroud from the -6, a 2.4L if I remember correctly. There is a cone-shaped diverter bolted to the back of the fan with 2 vanes, but the vanes on that diverter direct the air into a heat exchanger from what I could tell. The vanes point directly at a tube that connects to the shroud.

How did your engine run with it last year ?

I'll be fiddling with my 911 shroud this summer as well .. no cooling issues to report yet ! It will be fun to play around with diverters and such as all testing I have read about the 911 shrouds for VW engines has been using the shroud in its raw, unmodified form.

I bought one of those cheap fog machines at Walmart for Hallow'een ... would be cool to make a clear mold of that shroud and fill it with fog while the engine is running to see how the air flows.

Good Job.

Sandeep

[CLKWRK]

Hi,

Yes i did run it last year, but with only one TC on #3, i will be adding another one on #2 this year. head temps were kinda hot, but i suspect thats cause im running superflo 1's on the street... they only have 5 fins!
I was gertting an average head temp of 225cel on #3 spark plug, I am thinking of adding 911 style oil squirters under the pistons to keep the temp down.
Also, hot air from under the car has been "leaking" into my engine bay from an oil cooler that i had above the tranny, that problem will be fixed this year.
All oil cooling will be done at the front of the car from now on (just like petes car )

Bry

[Bad bug]

Hi Guy's,
I would really like someone to really produce a working shroud for this fan. I also have a 911 setup for my t4, its a Fat Performance shroud. I bought the engine just last december and haven't done anything to it as yet. Sandeep interesting point their my fan has a cone shaped divider on the back but i have noticed where it directs air down to number four piston and sleeve.

[Sandeep]

Originally Posted by Bad bug

I also have a 911 setup for my t4, its a Fat Performance shroud. I bought the engine just last december and haven't done anything to it as yet. Sandeep interesting point their my fan has a cone shaped divider on the back but i have noticed where it directs air down to number four piston and sleeve.

Can you tell me if that diverter will fit inside that shroud, as its the same shroud I have. My idea was to make some sort of cone to bolt to the back of the alternator, and then play around with fin locations on the cone, like what the stock cone fins look like.

The airflow off the back of the fan spins clockwise, and Porsche was able to almost redirect the air 90 degrees so it would enter that duct on the original 911-6 shroud.

So it can be done ..... My datalogger tells me I don't have any cooling problems right now, but I also am running a fairly stock engine.

Time to play ! Bryan .. I am with you on this, should be a cool project.

Sandeep

[NO_H2O]

Originally Posted by CLKWRK

Hi,

Yes i did run it last year, but with only one TC on #3, i will be adding another one on #2 this year. head temps were kinda hot, but i suspect thats cause im running superflo 1's on the street... they only have 5 fins!
I was gertting an average head temp of 225cel on #3 spark plug, I am thinking of adding 911 style oil squirters under the pistons to keep the temp down.
Bry

I'm running Street Eliminator heads on my 2275(same # of fins) 9.8 to 1 C/R and read CHT on 1 & 3. Using a Type-1 DTM my heads are within 15- 20 deg. F while running down the interstate and range 310 to 340 deg. F. depending on the grade (up or down hill). That style head can be cooled. I know lots of people would like to see a 911 fan shroud developed to run as well on a flat 4. Stay with it,,,, you just might come up with a shroud that works. Then sell the hell out of it.

[effvee]

Hi, looks good. Since you don't have the engine in, can you mount it to a bare block and use a electric motor to turn the fan? With a electric motor driving the fan ,tape one on each side of very large trash bags and start the motor. See wich side fills first, most likely it will be the right side. Then you can talor your vanes. With the stopwatch and the same size air collector (trash bags) you can continue your R&D, you are on the right track and it can be done on a engine stand. Good ideal :agree:

[Bad bug]

Jake will your 911 shroud be a bolton.

[Massive Type IV]

No, it will require machine work to fit under the decklid.

[oicdn]

You would think with the production of that shroud, R&D would have been done and they would have realized unequal cylinder cooling and adapt the vanes accordingly. Especially when adapting it to Beetle engines....

Just my noobie 2 cents, but wouldn't a + shaped vane placed closer to the fan blades, of course, sized to where the sizes of the "sqaures" are proportional to where the airflow comes be the optimal wy to divert cooling? Vanes closer to the blades prevents any turbulent "void" for the air to be in....couldn't that atleast help the cooling characteristics?

I remember in high school physics class I had a project of explaning why a ceiling fan, doesn't output the same amount of air in all 360 degrees when it's drawing the same amount of air in all directions. It output more air in certain areas. I can't remember why, but couldn't you just produce the vanes according to that fans' optimal air output areas?

I have no idea if that sounds jumbled...I'm on a Starbucks caffiene buzz....work sucks.