i've decided to ditch the mechanical fan and go with the efan setup.....and chose the permacool 16 incher....as many of u guys know.....it doesnt come with a shroud like the blackmagic one...so i went to home depot and picked up some Alumium flashing 14"x10' for ~8 bucks....bought a rivoting tool 9.95 and some rivots 2x2.49 ...this is the end result...




took about 4-5 hours including making the various pieces and rivoting them together...

 

if anyones interested in more pics......let me know now before i put it back on the car

 

plz! more pics! i wanna do this now!! lol

 

looks good...... let me know how good it works.......

 

Thats gay, ur gay!




J/k looks good, you have inspired me.

 

Sorry to be a downer, but you need to throw that shroud away and start again, as you've made two major mistakes.

Firstly, the hole in the back of the shroud should definitely not be smaller than the fan. All you're doing is restricting the fan's performance and unnecessarily restricting flow through the radiator at high speed. The shroud should have ~1/4" clearance from the fan blade tips.

Secondly, the depth of the shroud should leave half of the fan's depth inside the shroud and half outside. Look at any OEM fan, electric or machanical, and you'll see the same thing. This optimises the shroud's effect. Your fan is completely within the shroud, which will create a lot of flow-killing turbulence.

Making a shroud is a very good idea, you just need to improve you design to make it worthwhile.

 

damnit!!!!!...i know i shoulda made a post before i started rivoting........i hate rivoting.....

 

back to the drawing board

 

Yeah, riveting does suck. Thats why pneumatic rivet guns rock. You dont get the nice shock though your arms.

 

just make another one without the fan being totally underneath the shroud. check out the stock fan shroud and the way its designed... its pretty good even though its huge, just check out the way the fan blades are positioned with the shroud.

and make the hole a little bigger than the blades.

 

yeah....i figured...im just gonna start trimming the sides of hte circle to make it bigger.......i aint gonna chuck this....so many hours of rivoting.....so many hours......with a POS rivoter

 

hey man, look at it this way..

you got some experience working with the metal and riviter, and you also learned how to make an efficient fan shroud. so just get er done and you're golden

 

^ Ditto.

You have 3 options for placing the fan blade:
1) Place the blades half way in the hole, as indicated by NZConvertible.
2) Enlarge the hole to about the same size as the fan blade arc, then place the fan blades completely behind the hole (toward the engine). Then add a metal strip around the edge of the fan blade arc to act as a circular duct. You will see many e-fans in this configuration if they come with a plastic or nylon shroud body.
3) A combination of the two above, with the fan blades half way through the hole, but also adding the metal strip around the rear half of the blades.

Either way, you want the hole as close as possible to the fan blade arc without hitting (no more than 1" clearance).

Best way to help avoid mistakes: Make a cardboard mock-up shroud before you cut, bend, or rivet any metal. This way you can also test the shrould to make sure it fits in the car without any clearance problems. Duct tape and wood glue work great on the cardboard.

Things you did right:
1) At least 1" between the fan and the radiator.
2) Edges of the shroud angled toward the fan.

 

thanks...but i need pictures to explain what ur talking about....my faced turned into @c@ when i was reading it

 

Just cut the hole bigger.

 

I did something similar a while back, photodocumented here:
http://pengaru.com/~swivel/cars/rx-7/pics/07-23-2004/

The riveting is easy, what problems are you having? You just drill the hole, pop the rivet in with the rivet tool, and pull the handle -Snap! done. Whats so difficult about it?

I paid a few extra bucks to get a 'contracter quality' riveting tool when I bought the rivnut tool @ menards, it works flawlessly and supports quite a few different rivet sizes.

BTW, What are you using to cut the sheet metal?

 

now thats how ya do it. VITO STYLE

 

the problem is when i try to pop the rivot i need to clamp it twice... the insert is too long for the arm lever....then when i try to tighen it again...the clamp inside hte rivoter gets stuck and i'd have to loosen the back to get it out....overall..PITA....

 

buy a better riveting tool with a good tool it's sooo easy, the PITA part will be the drilling then.

 

X = What you have now.
1A, 2A, and 3A are as I described in examples 1, 2, and 3 earlier.
1B, 2B, and 3B are variants that may be a bit more efficient, but are probably more difficult to fabricate and may not be as strong as the A variants.

 

This is a good thread, should be archived.

 

great...now i'll go down in history as the person who made the bad fan shroud!!!!

 

yea the crappy one!