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giorgio67

912 engine ultralight flywheel

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Hi all guys,

next month I will start to reassemble and rebuild my upgraded 912 engine and I'm interested to fit a lighter flywheel.

I have found two options as the Garry Kemp unit is out of my budget...so does anyone have some experience with these two units?

http://qedmotorsport.co.uk/qed-shop/lotus-907-/-910-/-911-/-912/flywheel-and-clutch/steel-flywheel-ultralight-7%C2%BC-clutch

http://lotusbits.blogspot.it/search?updated-min=2011-01-01T00:00:00Z&updated-max=2012-01-01T00:00:00Z&max-results=20

The QED unit seems very interesting for the price, any feedback?

Thanks

Giorgio

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Not wishing to teach you to suck eggs, but I'm sure you're aware that lightening a flywheel will alter the power delivery characteristics.

I've heard that reducing the f/w by 1kg is equivalent to 100kg off the chassis weight - although only in first gear. Acceleration benefits are lower in higher gears.

Given that, why not have your existing f/w lightened/balanced by a competent machinst - unless you're going for an out and out racer (cost circa £80 - 100).

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Giorgio

Something to consider. Unless your car is for "track" use only I would shy away from a lighter flywheel. Yes, it will help in acceleration but it decelerates just as fast. What you will notice in street use is it being harder to maintain a cruising speed, which can be a bit annoying in my experience. The stock flywheel is pretty light as is. The other thing is it works as a vibration dampener. The 2.2 is a bit of a buzz motor and reducing the reciprocating mass will most likely make it more noticeable. Again, if its for racing, who cares........ but for street use?

Best,

Jeff

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Hi Jeff, good advice thanks.

I was thinking at a lighter fly to reduce bearings and crankshaft stress not for acceleration improving so I will see, annyway thanks for your advices guys.

Ciao

Giorgio

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Giorgio,

Meant to mention that by way of a compromise I had about 2kg taken off my existing f/wheel.

As such I'll gain a bit of acceleration in lower gears without losing too much f/wheel 'effect'.

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For my 912hc/907 build, I'm using a steel '84 turbo flywheel. Inch larger clutch disk than the 907, plus weighs 12.2 pounds verses the stock cast 907 flywheel weighing in at 19.4 pounds.

Brian

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