Flywheel Question, Is lighter better? |
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Flywheel Question, Is lighter better? |
ScottD914 |
May 31 2010, 07:24 PM
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#1
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Member Group: Members Posts: 69 Joined: 27-December 07 From: New London, CT Member No.: 8,506 |
(IMG:style_emoticons/default/idea.gif) Gentlemen and Ladies;
I've spent the winter rebuilding my 1.8 up to 2142 (or there about). The question I would pose is about the weight of the flywheel I need to purchase. My new Eagle Rods and KB pistons are much lighter than the stock equipment from 1974, does the sum of the mass in the case need to correspond with the mass of the flywheel somehow? I've seen two choices: 17lbs and 12 lbs. Your thoughts? Thanks. ScottD |
PRS914-6 |
Jun 1 2010, 10:32 AM
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#2
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Excellence Magazine Project 914 3.6 Group: Retired Members Posts: 1,278 Joined: 20-May 06 From: Central California Member No.: 6,031 Region Association: None |
Look at a flywheel as a device that "stores energy"
For a daily driver a heavy flywheel allows for easier stop and go driving since you have mass spinning that is more difficult to slow down. Let the clutch out a little too quick and the stored energy prevents stalling. A lightened flywheel will rev quicker and have better throttle response since it doesn't have to accelerate or decelerate as much mass. A nice touch for racing. It also helps to brake the car when you lift off the gas pedal since there is less mass to slow down. However, if it's too light the engine does not have enough spinning mass and becomes overly sensitive to letting the clutch out...it will want to die. Many engines need a little mass to idle smoothly, others don't. Light cars and low gearing reduce the negatives of a light flywheel A common complaint with Porsche engines is the rattling that comes from shaking the syncro assemblies at idle. Lighter can aggravate that. Bottom line, it's personal preference and the decision should be based on the primary use of the vehicle. Like most things in life, you give up something to gain something...... |
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