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Posted 23 November 2006 - 02:21 PM
Basically it's really not worth the time and effort to lighten the flywheel of a 73 HP N/A engine built for a 4WD D/R vehicle - in fact it's counter-productive because torque is the engine's best and most useful attribute. There are plenty of more productive changes that could be made to the engine - just having the distributor recurved is good for around 10 or more ft/lbs of torque and doesn't even require the engine to be pulled. I'm saying your money is better spent on other things.
Posted 23 November 2006 - 04:18 PM
I am with GD regarding money generally being better spent elsewhere.
Posted 23 November 2006 - 04:42 PM
It can be useful to improve shifting speed on race engines to lighten the flywheel - it improves the engine's "response" but does not by itself assist in making power - in fact if not coupled with other changes to the engine to improve power it will generally be a detriment to overall vehicle performance. It's a very specific enhancement done for specific race uses. I personally think it's entirely unappropriate for the EA81. Turbo engines and "street" engines such as the ER27 are another story.
Posted 23 November 2006 - 05:25 PM
Totally agree. These engines were given their flywheel's weight for a reason, and that reason wasn't because FHI was given a terrific deal on the cast iron. Street driveability can be greatly compromised by too low of a rotating mass, and offroad even much more so. For an offroad-only, rock-crawling vehicle I would rather have a flywheel with twice the PMI of stock.
...It can be useful to improve shifting speed on race engines to lighten the flywheel - it improves the engine's "response" but does not by itself assist in making power - in fact if not coupled with other changes to the engine to improve power it will generally be a detriment to overall vehicle performance. It's a very specific enhancement done for specific race uses. I personally think it's entirely unappropriate for the EA81. Turbo engines and "street" engines such as the ER27 are another story.
Lightened flywheels can feel like lots of fun in the fast and twisties, but a pain in the posterior in day-to-day driving. My thinking is that lightened flywheels go with proportionally lightened vehicles.
Posted 23 November 2006 - 05:52 PM
Posted 23 November 2006 - 06:13 PM
So, what vehicle are you installing this flywheel into? What will the primary use be?
And for the record, all my vehicles have lighter flywheels. Including my big Brat. Never seemed to have any problems with the bottom end torque or pulling people's stuck butts out of the goo!
Posted 23 November 2006 - 07:08 PM
My EJ wagon has an XT6 flywheel that I was fortunate enough to find at the parts yard (stock would have been fine with me but i found the flywheel at the right time). I haven't finished the car yet though so I have no idea how it runs
Posted 24 November 2006 - 10:05 AM
Posted 24 November 2006 - 10:13 AM
Posted 24 November 2006 - 08:29 PM
Posted 25 November 2006 - 01:26 AM
A lightened flywheel does not loose torque, it looses inertia:rolleyes:
AMEN!!! I'm shocked that that it took five posts to get the truth out. A lightened flywheel will:
NOT reduce torque
NOT change the torque curve for the worse (WILL look better)
make it easier to stall
make your clutch easier to overheat (You are lightening your heat sink)
NOT change your gearing
NOT make it harder to accelerate up hill
Posted 26 November 2006 - 08:08 PM
Posted 26 November 2006 - 08:53 PM
I thought i had their phone number, but it turns out i don't
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