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Engine + Driveline / M42 Aluminum Flywheel options
« on: October 03, 2009, 10:36:26 PM »
I have a JB Racing aluminum flywheel in my M20. I just had my engine rebuilt with S50 M3rods so have lightend the rotational mass on my engine. Just keep in mind you will hear rattling from your main transmission shaft with the aluminum flywheel; it's more pronounced with the S50 rods. I only hear it when the car is in neutral at idle with the clutch engaged. Lower mass makes it spool up a little quicker, but having less mass means starting on a hill a bit more challenging. I commute in San Francisco and my flywheel friction surface was in excellent shape with over 60K miles on it; I had it replaced by JB even though they said it did not require it. I have no regrets on having an aluminum flywheel. If you decide to buy one, I recommend JB Racing; they have the facility to rebuild it later. Also, they have excellent customer service. If the prices seems too good to be true, I would question the quality of the flywheel; you do not want this piece of equipment failing when you are winding up your engine. Consider JB Racing if you want a quality made flywheel.