Quote:
Originally Posted by churchx
there are also EJ & FA engines that had crank bearings fail in relatively low mileage on cars with both lightweight flywheel & lightweight crank pulley installed, requiring engine rebuild. So feel safe to compromise reliability of your car and your engine according to what subaru states. subaru, which most probably mentioned that for engines with stock flywheel and stock dampened crank pulley, not for one with aftermarket ones.
Boxer opposite engines may have least balancing/vibration issues and need least heavy flywheels/dampeners and no need for balancing shafts/weights, but still firing is not happening at all cylinders at same time and each firing twists crankshaft and puts extra load on bearings. Least need != no need at all. Going past reasonable may work on race engines where high budget and well equipped teams don't expect to last them past 10-15K miles prior rebuild/overhaul/replacement, but will not work for car daily driven or lightly tracked, but still owned by someone expecting it to last for 100K or more.
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every single one had forced induction. There are no vibration issues in a rev range our engine can actually hit, that is what internally balanced means.
Besides I did it to piss people like you off. All your theoretical bs is just that. Someone needs to actually test this stuff out in the real world.
Quote:
Originally Posted by 86TOYO2k17
Yes on FI it will matter more. And bone stock the car should come from factory perfectly fine, although they still put a dampener on for a reason.
However even NA after tossing on intake, bpb, full headerback, a tune, engine mounts, trans mounts, diff inserts/bushing, Fd swap, accessory pulleys, CF driveshaft, changing the cars factory weight distribution/reduction. All these would have effects on vibration that wasn’t originally intended/calculated from factory.
Not saying to the point of being detrimental to the engine. But possibly enough that adding a better dampener with a wider frequency of dampening could be beneficial.
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there is no damper on the car, that is a myth. Any vibration issues are going to be tuned for rpm's that the engine cannot possibly hit. That is what internally balanced means.
Any car that is as heavily modified as you mentioned could have issues that have absolutely nothing to do with vibrations.