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  #1  
Old 09-30-2002, 12:53 AM
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16V flywheel diet

Hi all,
I'm currently rebuilding and turbocharging my 16V, and I was wondering how much I should lighten the flywheel and where the best place would be to remove the weight. Naturally, the weight should be removed from as far outside on the flywheel as possible, so I was thinking of machining out a 1.5" radius about .5" deep in between each of the holes for the pressure plate. This would remove the weight on the outside of the flywheel, which is desireable. Am I on the right track? Would this weaken it too much?
How do you racers lighten your flywheels and how much do you remove?
This is a daily driver, so I'd still like it to be halfways drivable, though I'm willing to put up with some lack of drivability for more acceleration.

Thanks in advance!

Later,

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  #2  
Old 09-30-2002, 07:34 PM
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Any ideas? I'd like to do this in the next day or so, so I'd really appreciate some advice!

Thanks!
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  #3  
Old 10-01-2002, 02:14 AM
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Hi Dan,
sorry that I can't help you with your question but I'll be very interested in the result i.e. how the car drives with a lightened flywheel. I'm planning on doing the same thing but that will be in 1-2 months. Actually a friend will do it for me.


later
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  #4  
Old 10-01-2002, 07:54 PM
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Location: Suwanee, GA, USA
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We haven't ever done this. I'd give it a shot and see what happens. The engine is balanced, so if you do cut the flywheel, have it rebalanced at 0 and you should be OK.
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  #5  
Old 10-01-2002, 08:46 PM
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Cool...I'll try it and see how light I can get it. I'm shooting for 11 to 12 pounds. That's about 5 pounds lighter than stock. Mine weighed in at 17.5 originally. That should make a difference.
Benzmac, just out of curiousity, is your Tec 3 set up for distributorless ignition or will you still use the distributor? If it is distributorless, then where are you getting the crank signal for the ECU? The ECU I'm installing requires a signal from a 30-1 or 60-2 tooth wheel. So, what I've done is machine down the two tabs on the flywheel that the current sensor picks up and bolt a custom made 60-2 tooth wheel to the back of the flywheel that lines up with the existing sensor. I really hope it will work... But, I don't see why not.

Later,
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  #6  
Old 10-03-2002, 08:46 AM
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Ok, I went ahead and lightened it. By machining in .600" between the six holes, I was able to remove 2.4 lbs from the outside of the flywheel. I'm curious to find out what kind of a difference that will make. Here's a pic of what I machined off:
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16V flywheel diet-flywheel2a.jpg  
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  #7  
Old 10-03-2002, 08:48 AM
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Here's how my crank sensor wheel looks. I spun the flywheel on the lathe and positioned the sensor next to it and I got a good reading, so I'm pretty confident that it will work superbly. Here's the pic:
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16V flywheel diet-flywheel1a.jpg  
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  #8  
Old 10-03-2002, 08:17 PM
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Location: Suwanee, GA, USA
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WOW, you humble me with your excellent machining.

I think the wheel will work.

Mine is a modified Electromotive stock unit mounted to the back of the balancer. I am using a custom pickup and their wheel.

I am using stand alone, coil ignition with no distributor. The resolution is unreal. I have a 16x16 3d map that I can just dial in any number I want for ignition timing and I can trim back one cylinder at a time if I have a detonation problem on just one.


What clutch are you using? Mine is already starting to slip.
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  #9  
Old 10-03-2002, 09:28 PM
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Yeah, isn't it amazing what a DIY freak can do with a CNC machining center? That wheel took me a looooong time to make--about 15 hours. But, if I had to make another one, I could make it much faster.
I got the kevlar-carbon-fiber clutch from clutchnet.com for $195 (http://www.clutchnet.com/image/fiber.jpg). It's stock size and is rated at 550HP. I think it should work well, but there's only one way to find out!

Later!
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  #10  
Old 10-05-2002, 08:47 PM
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Will you modify or replace the pressure plate. Or, will the new disc do fine?
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  #11  
Old 10-06-2002, 10:47 AM
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I'm planning on using the stock pressure plate because it's still in really good shape. That should work! But, I have no way of knowing for sure until I have the car running again.

Later,

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