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Flywheel: resurface or replace?
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Glenn Premium Member
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PostPosted: Tue Dec 24, 2019 8:42 am    Post subject: Re: Flywheel: resurface or replace? Reply with quote

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.
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74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
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Alan Brase
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PostPosted: Tue Dec 24, 2019 9:42 am    Post subject: Re: Flywheel: resurface or replace? Reply with quote

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.)
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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
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virusdoc
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PostPosted: Thu Dec 26, 2019 8:13 am    Post subject: Re: Flywheel: resurface or replace? Reply with quote

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. Wink
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1976 Convertible Super Beetle, "June Bug".
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volksworld
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PostPosted: Thu Dec 26, 2019 9:31 am    Post subject: Re: Flywheel: resurface or replace? Reply with quote

back to the 1st gear shudder...make sure you have enough pre load on the bowden tube
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