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> Guess I'm kind of anal, Balancing flywheel bolts
DNHunt
post Nov 19 2005, 04:11 PM
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I wanted to remove a little off of the heads of the fllywheel bolts because the flywheel is lightened. At the same time I didn't want affect balance so I used a beam scale to make sure the bolts were the same weight. They actually vary quite a bit. It's probably not that big a deal cause they are close the center of the revolving mass. Oh well something to do.


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DNHunt
post Nov 19 2005, 04:12 PM
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This is actually a swingweight scale for golf clubs.


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DNHunt
post Nov 19 2005, 04:13 PM
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You can see there is a big difference in the amount of material removed.

Dave


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messix
post Nov 20 2005, 12:27 PM
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Dave your gonna eclipse jake in the over the top detail. don't for get to polish hone the starter ring gear teeth to make smoother start ups.
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J P Stein
post Nov 20 2005, 01:01 PM
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Kinda' anal? Anal obsessive doesn't even cover it. (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)
Balancing your lug nuts is next, eh?
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736conver
post Nov 20 2005, 01:10 PM
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Are you going to measure out the loctite for each bolt? Otherwise that would kind of defeat the purpose? (IMG:http://www.914world.com/bbs2/html/emoticons/huh.gif)
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DNHunt
post Nov 20 2005, 01:23 PM
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I can thank dental school for that. 4 years of it's not good enough. Always be critical cause you can find things you can do better.

Actually, I can't eclipse Jake. All of the pressure plate bolts are numbered so they end up in the same spots. I don't know how much 8mm X 20 bolts (?) can vary but it must be enough to foul up the balance. They are further from the centerline.

Dave
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SpecialK
post Nov 20 2005, 01:28 PM
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Nothin' wrong with being anal when it comes to putting your engine together! The little things add up! (IMG:http://www.914world.com/bbs2/html/emoticons/beerchug.gif)
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jsteele22
post Nov 20 2005, 01:40 PM
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Ooh, now you've done it. The way you went about removing mass from the bolts has the unpleassant consequence of making each bolt head a slightly different length, so the mass distribution in the direction perpendicular to the flywheel is no longer balanced. If you don't do something about that, there's gonna be a tendency for the flywheel to want to flutter out of its plane. If you rev the engine up to, say, 50,000 RPM you'll see what I'm talking about...
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Jake Raby
post Nov 20 2005, 04:51 PM
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I have tried flip flopping flywheel bolts on the balancer many times.. They are so close to the radisu of the crank that their imbalance has to be several grams befaore they make an impact that can be noted.

Pressure plate bolts are a different story- being so far from the radius increases their imbalance greatly . 1 gram of difference @ 5" radius can be well over 100 pounds of imbalance about 6,000 RPM. Thats why I index them all.

Good work Dave! You can never be "Over the top" NEVER
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Katmanken
post Nov 20 2005, 05:19 PM
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Iffen he was REALLY ANAL he would be custom grinding the length of a bunch of sockets so that the length of each socket EXACTLY matches the ground length of EACH custom balanced flywheel bolt..... (IMG:http://www.914world.com/bbs2/html/emoticons/blink.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif)

Go for it Dave.... (IMG:http://www.914world.com/bbs2/html/emoticons/happy11.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/happy11.gif) (IMG:http://www.914world.com/bbs2/html/emoticons/happy11.gif)

Don't forget to match number them.....

Ken
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maf914
post Nov 21 2005, 07:54 AM
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Dave, way to go.

Now you might want to drill a series of holes in each one to lighten them. (IMG:http://www.914world.com/bbs2/html/emoticons/laugh.gif)
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IronHillRestorations
post Nov 21 2005, 12:37 PM
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Am I the only one who noticed that Dave is using a golf club swingweight scale?????

I'm with Jake on this, too close to the center of the rotating mass to make much of a diff.
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bd1308
post Nov 21 2005, 01:58 PM
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QUOTE (Jake Raby @ Nov 20 2005, 04:51 PM)


Pressure plate bolts are a different story- being so far from the radius increases their imbalance greatly . 1 gram of difference @ 5" radius can be well over 100 pounds of imbalance about 6,000 RPM. Thats why I index them all.

whoops.

i guess its okay tho. no earth shattering vibration.
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