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The question, initially posted May 23, 2005, was:
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What did you get done on your Bolt today????


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Fan Blade Balancing?
#1430259 Mon Nov 15 2021 09:21 PM
Joined: Dec 2003
Posts: 3,971
S
'Bolter
Saw an episode on youtube where a builder cut down his fan blades by an inch. He then mounted them in place and the motor ran smoothly. I was of the impression that once you removed metal from a fan blade it should be balanced. Seems strange.
Spoke to my neighbour who is an expert on everything and he said balancing was unnecessary. He is a nice guy but unless he knows the answer he will make up one. He also broke two crankshafts on his diesel Land Cruiser over the years. He is now on his fifth rebuild.


"Sedgewick"
1949 Chevy 1/2-Ton
1989 Caprice

Re: Fan Blade Balancing?
Sedgewick #1430262 Mon Nov 15 2021 09:35 PM
Joined: May 2015
Posts: 5,313
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
If you cut the same amount off of each blade, then there probably wouldn't be a need to rebalance it. The outer portion of the blade has the most effect on balance, and if it was OK beforehand, it'll probably be OK afterwards.
Now if you cut one blade out of 4, then it would definitely be unbalanced. I have a fan that one blade broke off and they cut the opposing blade off to get it back in balance.


Kevin
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
#2 - '29 Ford pickup restored from the ground up.
First car '29 Ford Special Coupe
Busting rust since the mid-60's
Re: Fan Blade Balancing?
Sedgewick #1430265 Mon Nov 15 2021 09:42 PM
Joined: Apr 2005
Posts: 10,663
Grease Monkey, Moderator General Truck Talk & Greasy Spoon
It’s done fairly frequently in the hotrod world. They use a template and etch a fine line with a scratch awl. Cut a little short and sneak up on the line with a abrasive wheel. No issues.


Martin
'62 Chevy C-10 Stepside Shortbed (Restomod in progress)
'47 Chevy 3100 5 Window (long term project)
‘65 Chevy Biscayne 4dr 230 I-6 one owner (I’m #2) “Emily”
‘39 Dodge Businessmans Coupe “Clarence”



"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line"! Hug a cop!
USAF 1965-1969 Weather Observation Tech (I got paid to look at the clouds)

Re: Fan Blade Balancing?
Sedgewick #1430270 Mon Nov 15 2021 09:59 PM
Joined: Aug 2019
Posts: 132
D
'Bolter
Poured or hammered metal has inconsistencies, so nipping a little off the edges could throw it out of balance but we can’t be too certain how balanced it was from the factory. If you put it back on and hear vibration I guess you’ll know.

Last edited by DES57; Mon Nov 15 2021 10:01 PM. Reason: Changed molded to hammered

1957 Chevy 3200
PS, A/C, Tilt column, Rebuilt 350, Rebuilt TH350, Reupholstered Bench Seat, sound proof/insulated
Re: Fan Blade Balancing?
Sedgewick #1430271 Mon Nov 15 2021 10:08 PM
Joined: May 2015
Posts: 5,313
Housekeeping (Moderator) Making a Stovebolt Bed & Paint and Body Shop Forums
Most fans are pressed sheet metal and any inconsistencies in thickness would be pretty minor. Again as long as the same amount is cut from each blade, then no problems.


Kevin
Newest Project - 51 Chevy 3100 work truck. Photos [flickr.com]
#2 - '29 Ford pickup restored from the ground up.
First car '29 Ford Special Coupe
Busting rust since the mid-60's
Re: Fan Blade Balancing?
Sedgewick #1430319 Tue Nov 16 2021 02:15 AM
Joined: Feb 2004
Posts: 24,250
H
Kettle Custodian (pot stirrer)
I won't even attempt to straighten a bent fan blade, let alone start whittling on one.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
Re: Fan Blade Balancing?
klhansen #1430332 Tue Nov 16 2021 04:33 AM
Joined: Jul 2004
Posts: 3,836
R
'Bolter
Originally Posted by klhansen
I have a fan that one blade broke off and they cut the opposing blade off to get it back in balance.


The same thing happened years ago on the '46 truck my Dad had. Ran it for years with a 2 bladed fan.


Rich

'47 Loadmaster [stovebolt.com]

1947 Chev. Loadmaster

1959 Chev. Viking 40

Genie: "I am the genie from a magic lamp and I have the power to grant you three wishes."
Me: "I want to be rich."
Genie: "OK, Rich, what's your second wish?"








Re: Fan Blade Balancing?
Sedgewick #1430334 Tue Nov 16 2021 04:49 AM
Joined: Nov 2006
Posts: 262
J
J M Offline
'Bolter
I would have to agree with Jerry. Fan blades can come apart, and you don't want to be in the area when they do.
Jim

Re: Fan Blade Balancing?
J M #1430349 Tue Nov 16 2021 01:56 PM
Joined: Sep 2013
Posts: 1,401
M
'Bolter
Originally Posted by J M
I would have to agree with Jerry. Fan blades can come apart, and you don't want to be in the area when they do.
Jim

Yep, my in his 30's cousin did a total nut and bolt down to bare frame on a M38 Jeep. Built a nice Buick V6 for it and it was a nice rig. While leaning over the front and with a hand on the throttle linkage a fan blade came off. A few days later I was at his funeral.

RonR


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A



Re: Fan Blade Balancing?
Sedgewick #1430355 Tue Nov 16 2021 04:03 PM
Joined: Feb 2004
Posts: 24,250
H
Kettle Custodian (pot stirrer)
Back in the 1950's it was common for the dirt track racers to shorten the fan blades on flathead Ford race engines. One night in Nashville a blade broke off as a driver revved his engine up. It hit a pit crew member in the sternum and pretty well destroyed his rib cage. He survived, but he was never able to work again.

If you want a small diameter fan, buy one.
Jerry


"Freedom's just another word for nothing left to lose"
Kris Kristofferson

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

WAG MORE- - - - - -BARK LESS!
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