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#83 (permalink) |
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Member
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Hello, I am a Mechanical Engineer. I do not work for Honda so take my opinions as they come.
I understand Freerides point that the stock pulley has the rubber ring for a reason, to dampen, reduce NVH. I personally don't think that by replacing that rotational device by a solid pulley will result in any great engine damage. In my humble opinion it is safe to say that the engine will probably fail due to normal causes (wear and tear) before the pulley's cause. If and only if the pulley had true balancing characteristics (a bulging counterweight on one side) and it was to be removed than that could be dangerous. A lot of V8s use external balancing because the V orientation of the engine introduces forces in odd directions. Race and some modern V8s undergo zero balancing, sort of like the inline 4s. Inline 4s are much easier to balance than V8s because the V8s like i said, produce extra force components that must be accounted for. In any case, looking at the system as a whole. It is safe to say that through the belt, clutch, bushings, engine mounts etc... there is enough damping. Now if you were to go with solid engine mounts, solid bushings, 6 puck clutch, FI and shave 400 lbs you are going to reduce the damping characteristics of the car as a whole. Other than that, the pulleys seem fine in my book. My 2 cents. - Dan |
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#85 (permalink) |
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Member
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But you got to think, why would a company put out a product that is going to cause damage, they would be responsible for destroying thousands of engines and would be screwed. Also I am sure they could replicate the dampener and balancing of the stock pulley without much cost.
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#86 (permalink) |
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8thcivic Sponsor
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All of these topics, frequently asked questions, discussion, etc can now be found at the following link. Add to that, the testimonials of hundreds of NST customers who use these pulleys on their Honda Civic and Honda Civic Si engines...
the COMPREHENSIVE thread on NST (NonStopTuning) Pulleys Please feel free to post your thoughts and comments there in that thread everyone. |
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#90 (permalink) |
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Senior Member
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Im a mech. engr. and I dont see an arguement. Based on facts, the solid pullie will not absorb harmonic vibrations as well as the one with a rubber ring. However your engine will die of wear and tear before the pullies really damage anything.
And honda will not include/design anything in the car without a reason. Everything has a function, because they will do whatever it takes to save money, as any business would. |
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#94 (permalink) |
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Senior Member
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the crankshaft is internally balanced on the Civic Si, and the pulley has no effect on the balance AT ALL. older pulleys with harmonic dampeners would affect the crankshaft balance, but todays modern engines it wont.
PS> NST, if you read this...Thank you for your support/patience with my order. I cant wait to install...... |
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#95 (permalink) | |
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Senior Member
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Quote:
Fluidampr |
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#97 (permalink) | |
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Senior Member
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K20 engines are balanced internally
Quote:
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#99 (permalink) |
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Metal Head
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Yes!!!
I installed mine today, here's few more pics to add to the numerous others on this site. DIY: NST Pulleys for Civic Si |
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LinkBacks (?)
LinkBack to this Thread: http://www.8thcivic.com/forums/engine/23858-nonstoptuning-nst-k20-si-kit-diy-pics-dynos.html
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| Posted By | For | Type | Date | |
| NST Pulley Update!!! - Page 4 - 8th Generation Honda Civic Forum | This thread | Refback | 01-04-2008 03:46 AM | |
| NonStopTuning (NST) K20 SI Kit DIY, Pics, Dynos... - 8th Generation Honda Civic Forum | This thread | Refback | 12-14-2007 03:39 AM | |
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