Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> 'fan' out of balance?, Factory Balance?
0396
post Oct 12 2013, 11:47 AM
Post #1


Advanced Member
****

Group: Members
Posts: 2,046
Joined: 13-October 03
From: L.A. Calif
Member No.: 1,245
Region Association: Southern California
Question for the brain trust.
Is the factory balance of the fan 'good ' or should it be rebalance on a rebuild?

Thanks in advance for your suggestions.
oh is so, where in the La area to do that?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Black22
post Oct 12 2013, 11:54 AM
Post #2


Senior Member
***

Group: Members
Posts: 886
Joined: 1-November 07
From: Creswell, OR
Member No.: 8,290
Region Association: Pacific Northwest
QUOTE(396 @ Oct 12 2013, 10:47 AM) *

Question for the brain trust.
Is the factory balance of the fan 'good ' or should it be rebalance on a rebuild?

Thanks in advance for your suggestions.
oh is so, where in the La area to do that?


Rebalance.

European Motorworks or Fat Performance should be able to do this.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
0396
post Oct 12 2013, 04:03 PM
Post #3


Advanced Member
****

Group: Members
Posts: 2,046
Joined: 13-October 03
From: L.A. Calif
Member No.: 1,245
Region Association: Southern California
Thanks for suggestion..
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
euro911
post Oct 12 2013, 11:31 PM
Post #4


Retired & living the dream. God help me if I wake up!
*****

Group: Members
Posts: 8,851
Joined: 2-December 06
From: So.Cal. & No.AZ (USA)
Member No.: 7,300
Region Association: Southern California
Peter, if you're taking it apart (to clean, blast, paint, etc.), make note of where the factory installed balance weight is on the pulley in relation to the timing notch in the cast fan part. It should go back together in the same position to avoid a big rebalance job (ask me how I know) (IMG:style_emoticons/default/dry.gif)

Have the whole rotating system balanced (crank, flywheel with clutch and pressure plate, and the fan/pulley all attached). Have the shop balance your pistons and rods as well. You'll be glad you did in case you ever over-rev the motor (IMG:style_emoticons/default/shades.gif)



Hi Mike.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post Oct 13 2013, 02:22 PM
Post #5


Custom Member
***************

Group: Members
Posts: 24,585
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States
Balance everything.
If you have one part out of balance, you wasted you time and money having the rest balanced.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
0396
post Oct 13 2013, 02:27 PM
Post #6


Advanced Member
****

Group: Members
Posts: 2,046
Joined: 13-October 03
From: L.A. Calif
Member No.: 1,245
Region Association: Southern California
That's my line of thinking
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post Oct 13 2013, 06:03 PM
Post #7


Engine Surgeon
*****

Group: Members
Posts: 9,394
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States
We don't really offer the service anymore (even though its still on the site) but this link will give you some information to support why everything needs to be balanced.

http://www.aircooledtechnology.com/index.p...namic-balancing
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
0396
post Oct 14 2013, 06:23 PM
Post #8


Advanced Member
****

Group: Members
Posts: 2,046
Joined: 13-October 03
From: L.A. Calif
Member No.: 1,245
Region Association: Southern California
Jake,

Your comments, you are well regarded on my end.
Most of the outfits that I've contacted mentioned that it's not needed as it's already balanced from the factory. Today, I found and dropped off my fan at Auto Dynamic Balancing in Baldwin Park Calif # 626-962-9136 for them to check / balance. Well.... it was almost 1/2 once OFF....YA factory all right! Now, if it were I and I just rebuilt a type 4 and just bolted the fan back on...I would take if off and send it to Rod the owner so he can balance it for you. FYI.. we learn some thing every day!


Attached thumbnail(s)
Attached Image
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
r_towle
post Oct 14 2013, 08:39 PM
Post #9


Custom Member
***************

Group: Members
Posts: 24,585
Joined: 9-January 03
From: Taxachusetts
Member No.: 124
Region Association: North East States
Have you balanced the stock pistons.(IMG:style_emoticons/default/smile.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
0396
post Oct 14 2013, 08:53 PM
Post #10


Advanced Member
****

Group: Members
Posts: 2,046
Joined: 13-October 03
From: L.A. Calif
Member No.: 1,245
Region Association: Southern California
QUOTE(r_towle @ Oct 14 2013, 07:39 PM) *

Have you balanced the stock pistons.(IMG:style_emoticons/default/smile.gif)
funny as I bought a digital scale to check how close my new JEs were. They were all spot on with a Zero gram difference!
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Jake Raby
post Oct 14 2013, 09:03 PM
Post #11


Engine Surgeon
*****

Group: Members
Posts: 9,394
Joined: 31-August 03
From: Lost
Member No.: 1,095
Region Association: South East States
QUOTE
Most of the outfits that I've contacted mentioned that it's not needed as it's already balanced from the factory


Everything is "balanced" if the tolerance of balance is great enough.

Anyone who tells you that the stock crank doesn't need to be balanced is totally off base. They are ASSUMING a lot, and in engine machining and building assumptions are not made- ever.
Everything is quantified- ALWAYS.

Consider this:
1- What if the unit was previously dressed, or attempted to be balanced by an idiot?

2- What if Klaus had a bad day at work 40 years ago.

3- What if someone removed the fan ring and did not have a jig to re-center it? If this happens the fan is greatly imbalanced and can often never be re-installed "true".

Cooling fans are the second most imbalanced T4 component that we interface with, the only thing worse is a new Sachs pressure plate, which isn't even round- none of them are.

Nothing is ever good enough, especially when it comes to dynamic balancing.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ThePaintedMan
post Oct 14 2013, 10:34 PM
Post #12


Advanced Member
****

Group: Members
Posts: 3,886
Joined: 6-September 11
From: St. Petersburg, FL
Member No.: 13,527
Region Association: South East States
Jake, it's awesome when you share the science of building engines! Quantification indeed. (IMG:style_emoticons/default/aktion035.gif)

User is offlineProfile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 2nd June 2024 - 04:27 AM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...