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Welded and Balanced Fan Question
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Hotrodvw
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PostPosted: Sat Oct 29, 2011 8:09 pm    Post subject: Reply with quote

I had my stock, unwelded fan to 7K+ on accident.......it held up. Would I do it again? Heck no. Laughing I'm building a new IDA motor, going to weld the fan. I should say, that you can gain a bit of 'buffer' if you will, by running a smaller power pulley at the track to keep that fan from spinning so fast. This of course all depends on what RPM you're shifting at if it's isn't too obnoxious.
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Glenn Premium Member
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PostPosted: Sat Oct 29, 2011 8:15 pm    Post subject: Reply with quote

15 years ago I missed a shift and had the stock fan explode. Had to replace the shroud, oil cooler, alternator and fan shroud. Also had 2 fins broken on the right side head.
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mxracer
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PostPosted: Sat Oct 29, 2011 8:42 pm    Post subject: Reply with quote

I tig'ed my T3 fan without issue. There is enough tab bent over at each fin to weld it without filler rod so throwing it out of balance isn't an issue. I had everything from pulley to flywheel balanced and the fan was still dead on after welding it. It's an easy job with a good tig welder and a little skill. If anyone is interested PM me and I'll weld it up for a fraction of the cost of a Berg one. Then you can get it balanced (or at least checked) when you get the rest of the parts done. I also plan to make a jig for my balance machine so I can take care of that part as well.
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69 Jim
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PostPosted: Sun Oct 30, 2011 12:06 am    Post subject: Reply with quote

Didn't research it well enough prior to purchasing one from Kustom1. What a wobbling piece of crap. Will be calling Berg on Monday. Live and learn...
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[email protected]
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PostPosted: Sun Oct 30, 2011 11:24 am    Post subject: Reply with quote

You can prevent some of the fan issues by running a GOOD BELT, "race loose". The fan will hit a speed and won't go faster, even with increasing engine speed. That's one problem with Serpentine Belts, they grip "too well".
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rkeller
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PostPosted: Wed Jan 18, 2012 5:34 pm    Post subject: Reply with quote

Is there a market for a better fan?
We are thinking about manufacturing an advanced fan design.
http://www.thesamba.com/vw/forum/viewtopic.php?t=494873&postdays=0&postorder=asc&start=0
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58 Plastic Tub
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PostPosted: Wed Jan 18, 2012 10:43 pm    Post subject: Reply with quote

I would be interested. There's one....
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PostPosted: Fri Jan 20, 2012 1:21 pm    Post subject: Reply with quote

Hotrodvw wrote:
So, welding them is the easy part. How does one balance one themselves? I know how it's done, but have any of you done it yourself at home?

sure, anybody can do it themselves at home. you just need to own a balancing machine. do you have a balancing machine at home?
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Hotrodvw
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PostPosted: Fri Jan 20, 2012 1:32 pm    Post subject: Reply with quote

I do not.
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catbox
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PostPosted: Fri Jan 20, 2012 1:46 pm    Post subject: Reply with quote

Lawn mower blade balancer....


Laughing
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Hotrodvw
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PostPosted: Fri Jan 20, 2012 1:49 pm    Post subject: Reply with quote

Think Harbor Freight sells balancers.....
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PostPosted: Mon Jan 30, 2012 12:21 am    Post subject: Reply with quote

X2 on racin jason.
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adalcanto
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PostPosted: Tue Jan 31, 2012 1:38 pm    Post subject: Reply with quote

The bottom line is you never want one to explode as it tears things up beyond belief. I had one explode at Sacramento (BOM) and it took out the fan shroud, alternator and broke a few fins off of one cylinder. The noise.... holy crap! My linkage got tweaked and what not. Letís just say that night I was in the pits doing a teardown and repair with a mediocre fan I bought from a vendor. On race day I pulled the belt so there was no chance of another grenade going off. I now run a Berg fan with a serpentine belt and have taken it up but still uncomfortable with it so I pull the belt when I race. Even if you use a v-belt and run it loose it is risky in my opinion and most time the belt just rolls off and you lose it at halftrack.

1LOW67
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rs58rag
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PostPosted: Wed Feb 01, 2012 11:14 pm    Post subject: Reply with quote

Fully tig welded German fan is the way to go and remember to torque fan nut to 40-45 lbs.
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Joost
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PostPosted: Mon Feb 27, 2012 6:50 am    Post subject: Reply with quote

http://www.gwd-weiser.de/?luftkhlung=hochleistungs-lufterrad
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hpw
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PostPosted: Mon Feb 27, 2012 3:12 pm    Post subject: Reply with quote

Joost wrote:
http://www.gwd-weiser.de/?luftkhlung=hochleistungs-lufterrad


345,00 Ä=$462.00 Shocked Did I convert that right?
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Hotrodvw
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PostPosted: Mon Feb 27, 2012 3:30 pm    Post subject: Reply with quote

Sounds appropriate due to the weak USD. There are other ways than spending $462.00.
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thebucket
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PostPosted: Mon Feb 27, 2012 9:11 pm    Post subject: Reply with quote

Glenn wrote:
Berg.

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Trust me... it's not pretty one a fan explodes... i've been there.
Dittp!
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youngstah
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PostPosted: Sun Jan 11, 2015 6:20 pm    Post subject: fwiw berg doghouse fan 2105 Reply with quote

After reading this older yet informative thread and speaking w a berg late last year i figured a purchase was in order. It seemed at the time there were only a few German OEM fans hanging around still.

I waited until now to place the order. I thought od share woth you what i received and let you comment: Prumsa (sounds brazilian?)

Im NOT completely on the up and up re good vs bad practices with welded fan production but upon inspection i did notice the following so perhaps you could comment:
- good weld penetration
- it seems filler rod was used
- the veins dont appear to be perpendicular to the axis
- the edges are ground for circumference rounding - is this how its balanced?
- clean bare metal, coated w a wd40 like substance (do folks have theirs painted / powder coated and will this affect the balance?

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Eaallred
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PostPosted: Sun Jan 11, 2015 7:40 pm    Post subject: Reply with quote

It certainly does look like filler rod was used. Using a TIG to simply melt the existing tabs over works extremely well though....
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