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my civic
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Discussion Starter #1
for an after market clutch such as stage 3 or 4 i know on there websites they always say to use with lightweight flywheel but why
 

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I no longer haz teh pink eye! Iz got STINK EYE
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i dont like lightweight flywheels, love the stock ones. but other people like the rpm's to go quick for quick shifting.
 

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92 cx
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If you want good gas mileage i hear heavier is better (more inertia cuz of more mass). I like the lightweight ones for performance, quicker revs, less rotating mass, feels like its accelerating faster cuz it revs quicker. Our D's are stroker motors in a way so id imagine the heavier flywheel is a better combo to help torque. But on a B series engine id want a light flywheel cuz it'd help in the high revs where its meant to make power spinning its azz off.
 

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88 ED6
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For gas mileage I don't see how heavier would help. The CXs have lighter flywheels; about 3lbs lighter, than the other D-series(not sure about the VX though). A heavier flywheel would soak up more energy to spin at the same rpm as a lighter flywheel.

From my experience, the benefits of a heavier flywheel is driveability and launching.
 

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92 cx
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Stock flywheel will help with mpg cuz it stores more momentum at cruising speed. So at steady speeds you'd save more gas.

And you'd probably see better mpg with a lightweight flywheel where you do lots of stop and go driving.

A lightweight one is more fun. On a D engine id just get one thats not super light. Somewhere around 8.5-11 lbs
 

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88 ED6
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:werd:

If you're cruising, momentum and energy to store that momentum still comes from "the gas". An instance where a heavy flywheel would help would be in maintaining a set cruise speed; like driving through slightly hilly areas.
 

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91 CRX Si
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I'd go with a D15B8 (92-95 CX) flywheel if I had to do it over again. It's really light for OEM.
 

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my civic
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Discussion Starter #11
Well I have a clutch masterr lf n my car but on my buddies vitura build we wanted a bigger clutch and all sites tel u to use with lf and I didn't know if it was needed but thanks guys for the help
 

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Brokedick Millionaire
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40,422 Posts
Well I have a clutch masterr lf n my car but on my buddies vitura build we wanted a bigger clutch and all sites tel u to use with lf and I didn't know if it was needed but thanks guys for the help
translator please!
 

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1993 Cobra
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hell, i got a 6.7Lb. flywheel now. I have zero problems with launching, driveability or mpg's...weird? And i have had the same clutch with this flywheel for the better part of 4+ years now. Still holds strong.

Its all on what the car will be built for, whether its a n/a build or turbo, auto-x or drag or even a DD.
 

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Red '95 EX
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well ive drivin my stock 18lb flywheel on my 95 civic and then drivin an 89 si crx with a 7lb fidanza. both grabbed really well for me. of course the 7lb was on a built motor with a stage 3 6puck sprung clutch and so it grabbed like crazy but either way i would say buy a light OEM flywheel like the z1 which is 13lbs. right in the middle, so it would more than likely be very versatile and be good with any kind of build, NA, boosted etc etc.


also, i wouldnt get an aluminum one, fuck that. high heat + aluminum = warpage! STEEL FTW
 

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88 ED6
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I have a 7lb flywheel too(I'm actually looking into purchasing a twin-disc clutch that should help reduce rotational inertia also)! I can tell you, it's not as forgiving as a 18lb flywheel. My brother can drive it just fine, but the room for error is much less(much easier to bog), and it's harder to start as smooth as a heavier flywheel setup. Though, when I had a 7lb flywheel on my Accord...it didn't make much of a difference.

As for launching, this has been discussed before so I won't go into that.
 

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'89 CRX HF
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hell, i got a 6.7Lb. flywheel now. I have zero problems with launching, driveability or mpg's...weird? And i have had the same clutch with this flywheel for the better part of 4+ years now. Still holds strong.
This. I got used to my 11lb flywheel quick, don't even notice it anymore.
 

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Lighter flywheel = less rotating inertia
Which means that you will accelerate faster.

Lightening the driveline at any point (Flywheel, driveshaft, axles, wheels, etc.) has a much bigger improvement in the acceleration characteristics of the car than it would if you took that weight off of the chassis.

Its supposed to be roughly a simulated gain of 2 hp for every pound taken off of the driveline at engine speed (i.e. the flywheel, clutch, crankshaft, crank pulley) and a simulated gain of 0.5 hp per pound at axle speed (i.e. axles, wheels, tires, lug nuts).
As opposed to a simulated gain of 0.15 hp gained for every pound taken off the chassis.

That being said, there could be some situations where a heavier flywheel is needed, like in drag racing. Or possibly helping staying in boost while shifting with a really big turbo.
Im not a drag racer so I dont know.

But on a track car, the lighter the better.
 
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