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#1
02-08-2002, 01:23 PM
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Anyone have a lightened flywheel?
I was just curious if anyone has installed one on their h22's and what kind of power gains you noticed and how fast the rpm's went up compared to stock.
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#2
02-08-2002, 01:32 PM
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a common mistake is that a flywheel "makes" horsepower. it doesnt. it frees up some though if you want to think of it that way. it just makes it easier on the rotating assembly to turn the wheels. another factor you have to take into account if you are racing 1/4 mile is that off the line you want to "shock" the wheels as much as possible to get you goin'. with your stock ~22lb flywheel you can "shock" them quite well since something 22lbs spinning at 4000rpm's has a hell of a lot more force than a lightweight 11lb flywheel spinning at the same rpm level.
i have a JUN ultra light flywheel under my bed awaiting my h22 swap. from what i've heard and read the revs go up MUCH quicker. unless you go really super light like 8lbs or something, it still shouldnt be too hard to drive in traffic or anything. you will also be able to slow down through the gears a lot easier with the lightweight flywheel.
__________________
-Jeremy | [email protected]
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#3
02-08-2002, 01:45 PM
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Yeah, I knew that the lightened flywheel doesn't 'make' power, it simply doesn't steal as much from the wheels
 I'm about to drop an H22 in my accord and I'm replacing the clutch and flywheel while the engine is out so it's nice and easy to install. I didn't really know what a flywheel did until I really got into some cool things to do with my mechanic. I don't understand why more people don't get one of these things. I mean, if it's 1/2 as cool as I think it will be, it seems like a better addition than even an exhaust. Oh well, that's why I wanna know some real experiences here.
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#4
02-08-2002, 05:44 PM
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Quote:
that is untrue... shocking the driveline with motor power results in broken CV axles. a lightweight flywheel is advantageous to allow quicker revving... even in the drag arena. but in that case, you dont want it too light, so as to make it less durable. besides... if you have enough power, you dont need to rely on the flywheel's inertia to break traction at the line for a proper launch.
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#5
02-08-2002, 07:11 PM
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another important note...
with the lightweight wheel, your revs drop much quicker when you downshift, so you have to keep in the gas if you wanna keep up... i have heard that they have a tendency to rev really high really quick though, especially if you are speed shifting, which can get dangerous...
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#6
02-08-2002, 07:13 PM
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So I guess double clutching on down shifts would be a good skill to know how to do then huh?
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#7
02-08-2002, 08:43 PM
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Quote:
not really... revmatching works fine on synchro'd trannies
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#8
02-09-2002, 02:58 AM
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Quote:
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#9
02-09-2002, 07:15 AM
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Less Torque
I went to a good machinist for a quote on having my flywheel lightened and he stated that you will gain acceleration numbers but will actually loose a bit of Torque in the process lightening a flywheel. So if you have a few numbers to burn its fine I suppose but on a standard car I wouldnt bother. . :flash:
__________________
1994 2.2lt Jap import Vtec, Blown with a 1GGZE charger 300Hp or 220+kw Malpassi Reg, 500 injector, Unichip piggyback management system, Top gun leads, Map controller, Vtec controller, Custom FM Cooler, Custom fast flow exhaust and weight reduced (2640pds)
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#11
02-10-2002, 04:35 AM
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The funny thing is that the stock pressure plate weighs about the same if not more than the flywheel!! I put a CM on my SH about a month ago, the CM weighs about 8.5lbs and the stock one came up to 18.5lbs on my kitchen scale. I'll weigh the pressure plate tomorrow and let you know...
The flywheel helped my revs tremendusly, on the highway it pulles effortlessly past 130mph and engine brakes alot better. Rev matching is a sinch, just a little tap on the gas and downshift. The only thing is that you'll pick up a little more speed going down steep hills than with the stock one. The difference is not a big one but is noticable, a slight pickup in throtle response and acceleration. I replaced mine when I had my fith gear replaced, cost me 1/2hour labor at the dealership.
__________________
97 Prelude Type SH
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#12
02-10-2002, 10:56 AM
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Quote:
usually it's the other way around since there's a lot less rotational force to keep the motor spinning.
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#13
02-10-2002, 10:57 AM
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Quote:
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#14
02-10-2002, 12:17 PM
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Quote:
Maybe somebody should write a topic about the pros and cons of lightened flywheels because most people donīt really know how itīs working and just think that itīs kind of a `normalī bolt-on like a header or CAI!
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#15
02-10-2002, 02:12 PM
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The lighter flywheel will accelarate/decelerate faster no matter what; it all comes down to inertia or a resistance far an object to change speed or direction. For instance, take a piece of string and tie a weight to the end and spin it. Now try a heavier weight. The lighter weight is both easier to spin and stop than the heavier weight. Flywheels are much the same, the lighter the flywheel the quicker it will change speeds whether going up hill or down hills. The problem going down hill is that gravity pulles the car faster, which goes through the tranny and spins the crank. The lighter flywheel has less resistance to change so the car would speed up more. It's all basic physics...
__________________
97 Prelude Type SH
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