i searched on google about this and ppl have differing opinions. Based on ppl's own experiences w/ their xA's/xB's, what weight flywheels are best for our engines?
just lookin for some opinions/advice.

 

as long as its as durable as the stock flywheel it doesnt matter how light it is

 

well if its too light itll be way easier to stall the engine. im also interested in what a decent weight for a flywheel would be

 

The Jun Flywheel that I have is 10lbs. I think 7 or 8 pounds would be the best.

 

munch if you had it installed can you tell us how much it costs? there are somethings i wouldnt mind trying but installing a flywheel on a fwd car isnt one of them haha

 

I did it myself with a helping hand from my dad. I don't like people working on my cars. I do all my work myself.

 

oh awesome. how bad of a job was it?

 

I hope I never have to do it again Nah it wasn't that bad. I dropped the tranny one day and finished it the next day. Too much work for one day.

 

ok munch thanks a lot for the info!!!!!

 

No problem.

 

well, I've run as low as an 8lb flywheel on a few honda motors, and I absolutely love it.

There's both positive and negative points to the lighter flywheel... On one hand you get much quicker revs, and better acceleration. In between shifts the rpms also drop alot quicker since you don't have as much weight on the flywheel to maintain the inertia. This is good for me because I'd like to shift the box a little quicker.

Unfortunately with the positives come some shortcomings... On most inline-fours the flywheel also serves as somewhat of a harmonic balancer, so you can probably expect a moderate amount of vibration after installing the flywheel. You'll also find the car harder to drive when letting off the throttle in gear, in 1st or 2nd gear monstly.

I've heard others say that they lose gas mileage over long trips, and feel like they have less power uphil... Although I've never experienced any of these problems myself.

 

ok, thanks for all ur input. Munch says 7,8 lbs is good, but has a 10 lb flywheel...
Unorthodox Racing has a 9 lb flywheel - I think i've found a middle-ground, should go with that one huh?
Munch - ur revs drop real quick w/ the flywheel u have?

 

Nope but they go up a hell of alot faster

 

Id stick with 9lbs or above.

 

Like what others have said, get whatever is strongest and light weight.

A well balanced one will perform better than an outright lighter one.

 

with that being said, i'm goin w/ the JUN flywheel http://www.junauto.co.jp/products/dr.../index.html?en
now i just need some place to import one for me

 

When I started reading this topic I had a lot to say. Then I came to tws's post. He covered all the pro's and con's of running a lighter flywheel... for the most part.

Sure, you will rev faster but long term the engine will wear faster too. Also, as twc mentioned, is the harmonic balance the engine achieve with the stock flywheel. That rotational resistance from the extra weight is felt all through the engine. It is similar to back pressure in exhaust. Take too much away and you cause problems inside the cylinder and valves.

I'm not saying don't run a lighter flywheel, or that a 7, 8, or 9 lb. flywheel is better. Just sayin' to be careful with your revs, be religious about oil changes and be thinkin' your engine life may be a tad shorter. This is uncharted territory for this motor. Racing teams who do this on the track change out engines early. They don't let their motors grow old.

 

lighter is NOT always better! keep this in mind. match the weight with what you plan to do with the car. if it's an everyday car stock weight or just a couple pounds lighter then stock is more then enough. going overboard is just outrageous unless you're using it for a border line street car/track car.

like someone else mentioned if you go TOO light it will probably have idle/stall issues when coming off throttle/speed to a complete stop (a lot of the highly modified Z's and G35's i've seen with carbon clutches with ultra light weight flywheels provided as a combo kit tend to do this. nothing wrong with the car or clutch, it's just the pure fact the flywheel is so light) . revs will pick up quicker but will also drop just as quick. remember, the flywheel is used to store energy. if you do a lot of freeway driving i'd advise against it because you'll be on the gas a lot more frequently then a stock weight.

again, match the weight with what you plan to do with the car.