Problems with balancing after installing aftermarket flywheel
 

Has anyone experienced flywheel balancing problems after installing an aftermarket one? I´m about to install a aftermarket lightweight flywheel and have my eyes on several ones. I find the design of all flywheels to be very different, material, one piece flywheel or several pieces, where the weight is located etc...
Here are my thoughts:

MS leightweight flywheel:
I like the look of this one. It´s a one piece leightweight flywheel wich theoreticly minimizes the chance of unbalancing. Looking at the design I find that most of the weight is located at the center and the drilled holes at the outside minimizes the weight and G-force at very outer end. The MS flywheel is a bit heavier than others (and it´s not made of aluminium), but the design of it (most of the weight located at the center) should compensate for that. I actually believe that this is prefered if you compare it to one that has the exact same weight but more evenly distributed over the surfase. I don´t think one should stare oneself blind at the total weight only but rather where the weight is located.

Racing Beat
Looks like a 4 pice wheel... Which SHOULD mean that the chances of inbalance increases. I belive RB makes good quality products but a one piece wheel SHOULD minimize those chances. It´s lighter than the MS one but the weightdistibution seems backwards. Judging by the picture it looks as if it´s heavier at the outer edge than the MS one and its lightest part is at the centre. More rotating mass and higher g-force...

SR Motorsports
The lightest of the 3... Nice design and painted... :eek: :D Reminds alot of the RB one designwise. Not much to add here...

Those of you who has a aftermarket lightweight flywheel installed: Have any of you done a correct balancecheck of the wheel. Inbalance would put an enormous stress on the engine and reducing its longlivety. Is it safer to go with the more expensive MS onepiece fw that any of the others? What´s your experience?

Happy new rotaryear!

All flywheels require balancing as an assembled unit. This compensates for variables such as assembly hardware, dowel holes, dowel pins and friction surface variations. Unfortunately not everyone who claims to balance flywheels after assembly actually does so.

I have an ACT 9lb. flywheel installed. Why ACT? Because Mazda Motorsports sells it. That's all the endorsement I require, and $265 is a great price.
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BULB VAPORIZER

I see that all flywheels require balancing, but at the same time I feel that those that ain´t onepiece acually may require rebalancing after been used for a while...(?) $265? Man that´s cheap! :eek: Where did you get it? Website? Doesn´t hurt to take a look at others as well...

Can you cite any references that support this theory?
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PREGNANCY

Sorry no ref... just my thoughts. :rolleyes:
Since the renesis is a high rev engine it puts alot of stress on the flywheel, and the flywheel puts alot of stress on the engine (especially if it ain´t balanced correctly). A flywheel that is 2,3 or even 4 pieces + bolts may prehaps "settle" after driving with it for a (longer) period of time. This would then cause for another balancing... Or am I just paranoid? :D With this in mind (although no refs) I personally would feel much better off with a one piece fw. Or would anyone else care to convince me?

Don´t get me wrong, I would rather pay $300 instead of $600 if they can be proven equally.

isn't that only 265 for the flywheel? (counterweight is anouther 180ish isn't it?) i thought the racingbeat weighted in at 12 pounds..and the sr one was 9.75 lbs (not including counter wieght which is a lill over 3 lbs)

the ms counterweight is 3.6lbs
I have no previous experience with flywheels, but the ms i have has no problems at all. there were 2 important features for me, warranty and drivability, with that piece, a have them both;)

Counterweight is $34. Same one used for automatic transmissions is also used for a manual tranny w/lightened flywheel.
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WENDIE 99

I have had the whole SR kit with the 9.75 lb. fly and ACT clutch kit for almost 6 months. With much abuse and racing the clutch and fly have held up nicely. No vibration issues and the fit was perfect. Just make sure to rent to input shaft bearing removal tool. It makes life much easier. It should also be noted that much of the kit besides the pressure plate and flywheel are Mazda part numbers.

Charles