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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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02-12-2017, 02:25 PM | #15 |
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Oh no.
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02-12-2017, 02:41 PM | #16 |
extra what?
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Meh, I'm waaaaay over this debate. People will do what they wish. I won't be buying their beat up engines so what do I care?
Good call, OP. Get a lightweight flywheel if you wish but if you want cool functional up front, @Somerandom18 is on point.
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02-12-2017, 04:12 PM | #17 | |
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Our engine is a boxer engine. You literally cannot get more balanced. My Yaris, which is a i4, has had an NST pulley set for 60,000 miles. My BRZ has a pulley set for almost 10,000 miles. Our stock pulley's are crap. If I was going to add power I'd switch pulley's first thing. It is obvious they were made simply to last forever and not much else. Subaru's have a history of all sorts of idiotic issues that go back to their engineers compromising their engines in some way for the US market. If you really are worried about harmonics you need to go buy that fluidampr damper, hell it supposedly makes more power on a dyno as well. |
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02-12-2017, 04:29 PM | #18 |
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So I've put the OEM pulley back on and there is no vibration. Must either the way I installed it the first time or the it was the fault of the aftermarket pulley. Either way I'll leave it alone since its working now.
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02-12-2017, 04:37 PM | #19 | |
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"Would you buy that the OEM crankshaft pulley is a "elastomer style harmonic balancer" ....?? Allow me to rephrase the question for you. Would you agree that the OEM crankshaft pulley on a FR-S, is considered to be a "elastomer style harmonic balancer" ....?? humfrz |
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02-12-2017, 04:41 PM | #20 | |
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02-12-2017, 04:53 PM | #21 |
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There's a reason why the lightweight pullies lower horsepower..
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02-12-2017, 04:56 PM | #22 | |
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And that is how I got KO by your strong "I bought it therefore it works" cognitive dissonance arguments! Looks to me like you use "balanced engine" without even knowing what the harmonic balancer does. This is not a tomato/tomatoe case! Heck, a simple google will bring you this info: Every time the cylinders fire, torque is imparted to the crankshaft. The crankshaft deflects under this torque, which sets up vibrations when the torque is released. At certain engine speeds the torques imparted by the cylinders are in sync with the vibrations in the crankshaft, which results in a phenomenon called resonance. This resonance causes stress beyond what the crankshaft can withstand, resulting in crankshaft failure. But wait ...there is more: To prevent this vibration, a harmonic balancer is attached to the front part of the crankshaft So you see why no matter how "balanced" an engine is internally, if it requires a harmonic balancer (aka crank pulley damper, crankshaft damper, torsional damper, or vibration damper) and is being equipped with one from the factory by qualified engineers with years of experience, don't remove it! Especially if you rev this engine high enough to feel like you drive the car! Hope it helps! |
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02-12-2017, 05:16 PM | #23 | |
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02-12-2017, 06:33 PM | #24 | |
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"Second order comparison between the OEM tuned elastomer damper and Fluidampr performance damper. The dominant second order represents the firing order in four-cylinder, four stroke engines. Clear start and stop damping range spikes of the tuned elastomer damper are present at 3900 and 5250 rpm, or 130Hz to 175Hz, for a narrow operating range of only 45Hz. Note the smoothness of the Fluidampr damping capability through the same rpm range." Also, the third and fourth graph actually shows "The Fluidampr performance damper was able to cut amplitude of the excited 3rd order vibration generated by the 260Hz crankshaft resonance in half, down to below .1 degrees peak." I dare ask, do you even know what that means? You know, different frequencies and grades of vibrations, etc. I am not by any means an engineer but i have a somewhat clue about the complexity of it. If you really want it simplified, the fifth chart shows the extent of vibrations at different rpm. Next time, when you challenge the findings of a professional test, please make sure you really know what you are talking about. Also, please stop spreading wrong info. "What this article tells you is harmonics don't exist at all for our cars." Yeah it so does hey! Totally! Please read my previous post for educational purposes! |
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02-12-2017, 09:44 PM | #25 |
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....... how DARE you correct ME ....... I've already made up my mind and "don't give a crap what anyone says"! ......., to quote a recently self declared expert in the field of pulley things........
Seriously, I'm simple minded and just remembered this from what that guy Wiki had to say: "A harmonic balancer (also called crank pulley damper, crankshaft damper, torsional damper, or vibration damper) is a device connected to the crankshaft of an engine to reduce torsional vibration and serves as a pulley for drive belts.[1]" Is there a difference or are you just slapping around an old man for giggles ...?? humfrz |
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02-12-2017, 10:00 PM | #26 |
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Oh boy!
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02-12-2017, 10:13 PM | #27 |
extra what?
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I'm pretty sure "balancer" versus "damper" is a semantic argument. Where "damper" is functionally accurate, "balancer" has been used way more and so we're stuck with it.
For instance, I gave up making the distinction between "motor" and "engine." Yes, I know in this application an engine is the motor but I still cringe a little on the inside whenever I hear it.
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02-12-2017, 10:44 PM | #28 | |
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To me an "engine" is something you pour fuel into to make it run; a "motor" is something you plug in to make run ...... humfrz |
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