Lightened vs. Standard Flywheel Acceleration Tests |
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| Flywheel Introduction |
| The flywheel's purpose is to conserve momentum within the engine and
give smoother running, particularly at idle and low speeds. Lighter flywheels
will pick up rpms faster. BMW's from the factory have fairly light flywheels.
Because we have reduced the reciprocating mass by about 2 lbs. in our
2200 HiFlo engines, we can get away with running a lighter flywheel with
no degradation in smooth idle or low speed running. Lightening the flywheel
to 13-14 lbs. will pose no problems. Often an aluminum flywheel will create
low speed bucking problems. Also, the ring gear can come loose if it's
not staked in. If the aluminum flywheel gets hot, it will expand much
more than the steel ring gear. When it cools off, the ring gear will lose
its press fit and come loose. |
| 2000 RPM/SEC ACCELERATION TEST |
| Showing the power loss from running - stock versus
lightened - harmonic balancer & flywheel.
| |
Loss
from a Stock 10.25 lb Harmonic Balancer
vs.
a Lightened 4.75 lb Harmonic Balancer |
Projected
loss from a Stock 22 lb Flywheel
vs.
a Lightened 13 lb Flywheel |
| RPM |
Torque |
HP |
Torque |
HP |
| 3250 |
0 |
0 |
0 |
0 |
| 3500 |
2 |
2 |
5 |
5 |
| 3750 |
2 |
1 |
5 |
3 |
| 4000 |
2 |
1 |
5 |
3 |
| 4250 |
4 |
4 |
11 |
11 |
| 4500 |
6 |
5 |
16 |
13 |
| 4750 |
10 |
8 |
26 |
21 |
| 5000 |
13 |
13 |
34 |
34 |
| 5250 |
11 |
12 |
29 |
32 |
| 5500 |
7 |
8 |
18 |
21 |
| 5750 |
6 |
7 |
16 |
18 |
| 6000 |
4 |
5 |
11 |
13 |
| 6250 |
2 |
2 |
5 |
5 |
| 6500 |
2 |
2 |
5 |
5 |
|
| 1500 RPM/SEC Acceleration
Test |
| Showing the power loss from running - stock versus lightened - harmonic
balancer & flywheel.
| |
Loss
from a Stock 10.25 lb Harmonic Balancer
vs.
a Lightened 4.75 lb Harmonic Balancer |
Projected
loss from a Stock 22 lb Flywheel
vs.
a Lightened 13 lb Flywheel |
| RPM |
Torque |
HP |
Torque |
HP |
| 3250 |
0 |
0 |
0 |
0 |
| 3500 |
2 |
2 |
5 |
5 |
| 3750 |
2 |
1 |
5 |
3 |
| 4000 |
2 |
1 |
5 |
3 |
| 4250 |
2 |
2 |
5 |
5 |
| 4500 |
2 |
1 |
5 |
3 |
| 4750 |
4 |
3 |
11 |
8 |
| 5000 |
6 |
4 |
16 |
11 |
| 5250 |
6 |
5 |
16 |
13 |
| 5500 |
3 |
5 |
8 |
13 |
| 5750 |
4 |
4 |
11 |
11 |
| 6000 |
2 |
2 |
5 |
5 |
| 6250 |
2 |
2 |
5 |
5 |
| 6500 |
2 |
3 |
5 |
8 |
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