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Author Topic: Stock t/p fans  (Read 3647 times)
gizago
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« on: July 13, 2011, 21:31:11 pm »
What is the safest recommended maximum engine rpm for a standard fan?? Non welded, non balanced original german doghouse type. Just wondering if I need a welded one for the mild motor I'm building for the other halfs car, it wont see past 6K. Cheers, Mat.
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Taylor
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« Reply #1 on: July 13, 2011, 22:13:41 pm »
I have a non welded fan that saw 6-7000 regularly but I took it out and am going to have it welded. Its like $60 and well worth the piece of mind. $.02
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kingsburgphil
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Posts: 876
« Reply #2 on: July 14, 2011, 03:39:04 am »
Quote from: gizago on July 13, 2011, 21:31:11 pm
What is the safest recommended maximum engine rpm for a standard fan?? Non welded, non balanced original german doghouse type. Just wondering if I need a welded one for the mild motor I'm building for the other halfs car, it wont see past 6K. Cheers, Mat.
Funny you should ask. I just spent 3 hrs cleaning up a previous repair/welding job on my extra heads. The results of an exploded fan, I don't want
to show you the damage to an IDA.

Won't see past 6K ?  Picture this, you let your new girlfriend drive your car.  She upshifts at 5,800 back into 2nd instead of 4th.  Shocked
« Last Edit: July 14, 2011, 04:48:55 am by kingsburgphil » Logged
Bruce
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« Reply #3 on: July 14, 2011, 04:37:03 am »
Quote from: gizago on July 13, 2011, 21:31:11 pm
.... it wont see past 6K.

Rev limiter or a cam that quits at 6k?
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gizago
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Posts: 188
« Reply #4 on: July 14, 2011, 21:51:01 pm »
Quote from: kingsburgphil on July 14, 2011, 03:39:04 am
Quote from: gizago on July 13, 2011, 21:31:11 pm
What is the safest recommended maximum engine rpm for a standard fan?? Non welded, non balanced original german doghouse type. Just wondering if I need a welded one for the mild motor I'm building for the other halfs car, it wont see past 6K. Cheers, Mat.
Funny you should ask. I just spent 3 hrs cleaning up a previous repair/welding job on my extra heads. The results of an exploded fan, I don't want
to show you the damage to an IDA.

Won't see past 6K ?  Picture this, you let your new girlfriend drive your car.  She upshifts at 5,800 back into 2nd instead of 4th.  Shocked

Ouch Shocked  Now Ex Girlfriend??
Quote from: Bruce on July 14, 2011, 04:37:03 am
Quote from: gizago on July 13, 2011, 21:31:11 pm
.... it wont see past 6K.

Rev limiter or a cam that quits at 6k?


Rev limiter.
Its a 74x92 single valve spring motor, with treuhaft 010, c35 cam, 043 heads, 40 IDF's and sensible c/r, until she gets used to it- she's only had a warmed over 1600 t/p in the car up until now.
« Last Edit: July 14, 2011, 21:58:32 pm by gizago » Logged
.
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Posts: 1768
« Reply #5 on: July 14, 2011, 21:56:51 pm »
Quote from: Bruce on July 14, 2011, 04:37:03 am
Quote from: gizago on July 13, 2011, 21:31:11 pm
.... it wont see past 6K.

Rev limiter or a cam that quits at 6k?

Block of wood under the accelerator pedal ? lol !
 Grin
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gizago
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Posts: 188
« Reply #6 on: July 14, 2011, 21:59:12 pm »
Quote from: Richard Roth on July 14, 2011, 21:56:51 pm
Quote from: Bruce on July 14, 2011, 04:37:03 am
Quote from: gizago on July 13, 2011, 21:31:11 pm
.... it wont see past 6K.

Rev limiter or a cam that quits at 6k?

Block of wood under the accelerator pedal ? lol !
 Grin


 Grin Grin
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Zach Gomulka
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Don't piss down my back and tell me it's raining.
« Reply #7 on: July 15, 2011, 00:07:30 am »
Stock fan will be fine unless you plan on over driving it more than factory.
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Born in the '80s, stuck in the '70s.
Rennsurfer
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« Reply #8 on: July 15, 2011, 01:09:45 am »
Quote from: Zach Gomulka on July 15, 2011, 00:07:30 am
Stock fan will be fine unless you plan on over driving it more than factory.

 Huh

The factory hasn't produced these air cooled cars in Germany since I was in high school. Besides, they never over-drove their cars. At least not to our knowledge.

Moving forward, a welded fan (like what's been previously suggested) is more than solid peace of mind. Even on a mild engine, I highly recommend one. But... to each their own.
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"You can only scramble an egg so many ways."
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stealth67vw
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Posts: 2261
« Reply #9 on: July 15, 2011, 02:35:13 am »
Quote from: DKK_Fred on July 15, 2011, 01:09:45 am
Quote from: Zach Gomulka on July 15, 2011, 00:07:30 am
Stock fan will be fine unless you plan on over driving it more than factory.

 Huh

The factory hasn't produced these air cooled cars in Germany since I was in high school. Besides, they never over-drove their cars. At least not to our knowledge.

Moving forward, a welded fan (like what's been previously suggested) is more than solid peace of mind. Even on a mild engine, I highly recommend one. But... to each their own.
I think Zach means using a larger bottom pulley or smaller top pulley to increase fan speed.
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John Bates
JB Machining Services
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Zach Gomulka
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Don't piss down my back and tell me it's raining.
« Reply #10 on: July 15, 2011, 06:20:00 am »
Ding ding ding!!!
 Roll Eyes
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Born in the '80s, stuck in the '70s.
Jeff68
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Posts: 394
« Reply #11 on: July 15, 2011, 14:12:37 pm »
I think the rate of acceleration of the fan also has to be taken in to account when you consider if you need a welded fan or not.  A stock engine will not rev or acheive rpm as quickly as a tuned engine.  If the engine will be very mild you'll probably be fine, if it will rev quicker and is capable of 7000 rpm I would get a welded / balanced fan.  How much money is in the engine? A welded fan could also be considered cheep insurance.
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Rennsurfer
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D.B.O. Not a club; a state of mind.
« Reply #12 on: July 16, 2011, 04:55:41 am »
Quote from: Jeff68 on July 15, 2011, 14:12:37 pm
How much money is in the engine? A welded fan could also be considered cheep insurance.

BINGO.
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"You can only scramble an egg so many ways."
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Dave Rosique
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nobodyouno
« Reply #13 on: July 16, 2011, 05:09:10 am »
Quote from: DKK_Fred on July 16, 2011, 04:55:41 am
Quote from: Jeff68 on July 15, 2011, 14:12:37 pm
How much money is in the engine? A welded fan could also be considered cheep insurance.

BINGO.


Ditto.
 
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gizago
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Posts: 188
« Reply #14 on: July 16, 2011, 14:10:21 pm »
Quote from: Dave Rosique on July 16, 2011, 05:09:10 am
Quote from: DKK_Fred on July 16, 2011, 04:55:41 am
Quote from: Jeff68 on July 15, 2011, 14:12:37 pm
How much money is in the engine? A welded fan could also be considered cheep insurance.

BINGO.


Ditto.
 

When you put it like that it makes sense  Wink
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