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Glenn Mr. 010
Joined: December 25, 2001 Posts: 76902 Location: Sneaking up behind you
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Posted: Tue Dec 24, 2019 8:42 am Post subject: Re: Flywheel: resurface or replace? |
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Balancing is well worth it. I've built stock engines that run so smoothly you dont know they are running unless you see the fan belt moving. _________________ Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
#BlueSquare |
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Alan Brase Samba Member
Joined: March 28, 2004 Posts: 4532 Location: Cedar Falls, Iowa
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Posted: Tue Dec 24, 2019 9:42 am Post subject: Re: Flywheel: resurface or replace? |
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virusdoc wrote: |
Good news: I found a semi-local machine shop (less than an hour drive from home) that can properly machine both surfaces of my stock flywheel for $35.
He will also balance the entire rotating assembly for me (flywheel, pressure plate, crank, rods, pistons). The balancing may be unnecessary, but it's not that expensive and I've worked with too many unbalanced centrifuges in my career to be not do it. At 3000-4000 rpm, a small percent imbalance makes for a really rough spin. I have to imagine the same is true for the lower end of an engine, and that unequal force can't be good for bearings and other force-bearing parts. |
I pretty much agree about balancing reciprocating parts. Most any careful person can do a lot for a motor just balancing the pistons and rod.
Electronic scales are pretty cheap right now.
Critical balancing of the rods need to balance the END WEIGHTS, rather than overall. So that takes a little special rigging.
I would actually be rather surprised if you find a lot of correction on a factory crank.
(I'm a big fan of fully counterweighted cranks, but that's kinda beyond the scope of this thread.) _________________ Al Brase
Projects: 67 sunroof bug, 67 Porsche 912 Targa, 70 Westy
Dec 1955 Single Cab pickup WANT 15" BUS RIMS dated 8/55, thru 12/55
To New owners: 1969 doublecab, 1971 Dormobile
Vanagons:
80 P27 Westy JUL 1979, 3rd oldest known US
83 1.6TD Vanagon, 87 Wolfie Westy daily driver, swap meet home |
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virusdoc Samba Member
Joined: August 13, 2018 Posts: 525 Location: Durham, NC, USA
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Posted: Thu Dec 26, 2019 8:13 am Post subject: Re: Flywheel: resurface or replace? |
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Glenn wrote: |
Balancing is well worth it. I've built stock engines that run so smoothly you dont know they are running unless you see the fan belt moving. |
Thanks for the tip Glenn. I will make sure my guy balances the fan belt too. _________________ 1976 Convertible Super Beetle, "June Bug".
FI-->34PICT3 carb conversion-->now dual 40 IDFs
Self-rebuilt 1904 (after totally botching a 1641 rebuild, cussing a lot, and throwing lots of cash in the fire) |
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volksworld Samba Member
Joined: November 26, 2011 Posts: 2529 Location: formerly NY currently NC
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Posted: Thu Dec 26, 2019 9:31 am Post subject: Re: Flywheel: resurface or replace? |
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back to the 1st gear shudder...make sure you have enough pre load on the bowden tube |
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