Thinking about buying a lightweight front pulley? READ THIS!

[lsbrasil]

Choose whatever you want to use and balance it in a machine shop (all the rotative set)... You'll have NO problems at all... Just remember to choose a machine shop that actually DOES balancing over 3,000 RPM. Mine (B16 and soon my D17 too) was 10,300.
My case, of course...

[transzex]

The moment of inertia of an object up at the front end of the engine is just such an exception. It's called a crankshaft tortional vibration damper, or crank damper for short. Back in the '80s, even top drag racers were substituting heavy crank dampers for lightweight aluminum "hubs" in the belief they would go faster. The reality is these hubs, although having a vastly lower moment of inertia, actually cut power, even under high-acceleration conditions. The reason they did so is that they did not suppress crank tortional flexure. Such vibrations were transmitted directly to the cam via the timing chain and, as a result, the valve event timing was adversely affected and valve bounce was aggravated. All this led to a reduction in power, and I'm not talking .5 to 1 hp here, but sometimes 12 to 14 hp on a 400-odd-hp engine. The bottom line here is, use a functional damper first and worry about its moment of inertia last. That way your motor will make more horsepower, longer.

[mschoaff]

if you balance a motor wile you build it it does not matter what you do not need a dampener. some engines are internally balanced and 90% of 4 cylinders are internally balanced. you can totally use light weight pulleys to reduce the rotational mass of the crank.




as long as it is balanced

[cmgreen50]

^ if know enough to have your engines balanced you wont be stupid enough to ask about putting a chinese crank pulley on your dd. which is why this thread was created.

[K2e2vin]

Originally Posted by mschoaff

if you balance a motor wile you build it it does not matter what you do not need a dampener. some engines are internally balanced and 90% of 4 cylinders are internally balanced. you can totally use light weight pulleys to reduce the rotational mass of the crank.




as long as it is balanced

:facepalm:

[cmgreen50]

oh snap i thought he was talking about rebuilt motors that were balanced and blue printed

[ddd4114]

Originally Posted by mschoaff

if you balance a motor wile you build it it does not matter what you do not need a dampener. some engines are internally balanced and 90% of 4 cylinders are internally balanced. you can totally use light weight pulleys to reduce the rotational mass of the crank.




as long as it is balanced

Please don't post until you've read the entire thread...

[cervan]

Originally Posted by K2e2vin

:facepalm:

x999

[Idahocrx]

Quick question. I have an a6 damper with a sizeable chip in the power steering pulley part, shich i'm not goin to use. Can I grind it off myself or should i take it to my machine shop and get it machined off?

[cervan]

Originally Posted by Idahocrx

Quick question. I have an a6 damper with a sizeable chip in the power steering pulley part, shich i'm not goin to use. Can I grind it off myself or should i take it to my machine shop and get it machined off?

I would think your fine, go ahead and grind it off, just make sure to leave the rest of it alone.

[95RedVXCivic]

if the light weight pulleys are so bad, then this would be worse because of imperfections in grinding it by hand. plus, i have a d15z1 (i know, they suck) and it does not have a harmonic balancer on it, it is just a pulley. i have never seen an inline four cylinder that was not internally balanced, and if it was a problem with the pulley, then you would have the same problem with a lightweight flywheel as well. balancing is best, but you will NOT harm your engine by just putting a light weight pulley on it.

[K2e2vin]

I'm going to assume you did not read anything in this thread.

[ddd4114]

Originally Posted by K2e2vin

I'm going to assume you did not read anything in this thread.

Haha. I wonder what tipped you off...

[cervan]

*long drawn out sigh*

[transzex]

I refuse to entertain this idiot.

[sabes]

Originally Posted by transzex

I refuse to entertain this idiot.

LMFAO!!!!

[TravisCadello]

I call BS on this do not use lighter pulleys. I ran a Aluminum pulley on my B16a from 99 till 2005 and put over 85K miles on it no problems. I sold it to a Friend And hes been driving the shit outa it since 05 and no problems. the motor still runs great. matter of a fact i met up with him today and he was driving it. I lighter pulleys takes stress off the crank and lets it rev up more freely. And SPeaking of lightweight pulleys. My old d16z6 block i welded the pulley off a bad Honda Alternator onto my crank because my cranks threads broke that hold the stock pulley. and it never messed up after a year of driving it. but the welds came off.

[cmgreen50]

Originally Posted by traviscadello

i call bs on this do not use lighter pulleys. I ran a aluminum pulley on my b16a from 99 till 2005 and put over 85k miles on it no problems. I sold it to a friend and hes been driving the shit outa it since 05 and no problems. The motor still runs great. Matter of a fact i met up with him today and he was driving it. i lighter pulleys takes stress off the crank and lets it rev up more freely. And speaking of lightweight pulleys. My old d16z6 block i welded the pulley off a bad honda alternator onto my crank because my cranks threads broke that hold the stock pulley. And it never messed up after a year of driving it. But the welds came off.

wtf is wrong with you

[K2e2vin]

I guess this thread shows how bad our school system is.

Honda, and many other companies who spend millions of dollars on R&D, obviously do NOT know what they're doing

[ddd4114]

Originally Posted by TravisCadello

I call BS on this do not use lighter pulleys. I ran a Aluminum pulley on my B16a from 99 till 2005 and put over 85K miles on it no problems.

How was it driven? What else was done to it? What's the b16a's stroke?

Please read the whole thread. If you chose to run a pulley without a damper, it doesn't mean that your engine is 100% certain the fail. It just makes it more likely, and the three questions I asked will tell you a lot about how reliable it will be.

Oh yeah, and how do you know it didn't have problems, aside from the fact that it didn't blow up? Did you ever tear the engine down?