Quiet Lightweight Flywheel?

[siamkazi]

At the moment, we only do the lightweight S62 flywheel. We are discussing doing it for the S54, but there just isn't as much material to remove. IIRC the OE dual mass weighs 24ish pounds. It's already just over half the weight of the 62's flywheel. The bigger issue, though, is where we would remove the weight from. The aspect ratio of the E46 clutch disk to the flywheel is a good bit wider than with the S62, so it takes up a lot more space on the flywheel. This means there is less meat on the perimeter to remove, and, as discussed previously, removing weight from the middle, if any, has a minimal impact on the flywheel's acceleration compared to the perimeter.

It's a simple enough project, but it would be $800-$1000 for a flywheel that MIGHT(?) save a pound or two. It just doesn't present any sort of value proposition, it wouldn't make a material difference in performance/responsiveness, and it would take our CNC operator away from more meaningful projects. All to create a product that we do not necessarily believe in, for the sake of turning a little more profit.... That's not our style, so since we've discussed it internally, it looks unlikely that we will be doing the S54.

Sorry guys, I know that's not the answer you wanted to hear from us- we just dont want to sell something that doesnt make sense to us.

As an apology you should send us all 50% off coupons for a stroker build.

[1000hp]

As an apology you should send us all 50% off coupons for a stroker build.

Still couldn't afford it.

[1000hp]

Not sure if adding a heavier Ross/ATI damper could offset this?

I think it's the changing speed/motion of the crank and not the shock that rattles the transmission. Kind of like turning the input shaft back and forth with your hand and feeling the lash. The damper would absorb the resulting shock that goes through the crank but not change the actual motion. The damper that interferes between the crank and the trans is the 900lb dual mass flywheel we're trying to get rid of.

[jvit27]

I think it's the changing speed/motion of the crank and not the shock that rattles the transmission. Kind of like turning the input shaft back and forth with your hand and feeling the lash. The damper would absorb the resulting shock that goes through the crank but not change the actual motion. The damper that interferes between the crank and the trans is the 900lb dual mass flywheel we're trying to get rid of.

Ah makes sense. I've actually handled the shaft and felt that.. LOL

I was thinking back to s52 days when ltw flywheels would eventually rattle the rotating assembly apart due to the imbalance/lack of damping. But I guess the upgraded crank dampers target actual engine harmonics more than our trivial nonsense.

[1000hp]

Ah makes sense. I've actually handled the shaft and felt that.. LOL

I was thinking back to s52 days when ltw flywheels would eventually rattle the rotating assembly apart due to the imbalance/lack of damping. But I guess the upgraded crank dampers target actual engine harmonics more than our trivial nonsense.

This engine might also rattle apart with a light flywheel and stock dampener 🤔 But then again my S52 is still alive with one after many years and miles with 400whp (and it wasn't too noisy).
I think a good dampener is a good idea but it isn't gonna stop this engine from making noise.