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 |
J P Stein |
May 31 2010, 09:47 PM
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#2
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Irrelevant old fart Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
Let's not forget the inertia provided by a spinning flywheel. The heavy wheel provides much more energy for launching the car which was not mentioned by the ricer tome.
Back in the day, drag racing, the standard rule was: big motor, light wheel, small motor, heavy wheel. The small motor needed the extra stored energy that the heavy flywheel provided. This was back in the days of "heads up" class racing where the first guy across the finish line won. We used to launch at 7k rpms with a 301 chebbie & a 40 lb flywheel. I found a comparo in Hot Rod where a light flywheel showed an improvement of .7 mph over the quarter mile on a given car. I don't recall the car set up. The light clutch/flywheel combined with a tall 1st gear in the shitbox has made it a stone bitch to launch around the typical 90 deg start box. It does provide an overall weight loss for the car, however, and that is a plus. |
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