Worth the cash for a D17 N/A engine. will i see any gains?

 

anyone>?

 

No save the cash for UR pulley set if you are gonna put pulleys on.

 

UR pulley's, meaning underdrive pulleys? or no

 

Unorthodox Racing pulleys. Less underdrive and a hell of a lot lighter. Consider motor mounts and/or a torque dampner also.

 

No, don't bother.

OEM honda underdrives have a harmonic dampener in their pulleys, UR, AEM, etc do NOT. This will cause excessive vibration under load to the pulleys and eventually your crank. Premature wear is pretty much inevitable with these things... for the small gain, it's really not worth it.

 

They are not harmonic dampners, ALL Honda engines are factory balanced, it's an inertia dampner, which motor mounts and/or an engine dampner will take care of.

 

Okie-dokie...

Have you ever looked at a Honda pulley before? You'll find that it's not a single piece of metal. Typically, there's a nodular iron or steel hub and another "ring" of iron or steel surrounding it containing the belt grooves. The two parts are joined by a rubber layer. Now, what good does this do. Everytime a cylinder fires, it creates a "shock pulse" of sorts, firing the piston with an extreme force downwards rotating the crank. So basically, when fuel and air ignite, the piston is launched violently down, after the initial burst and with the crank creating an opposing force, the piston is quickly slowed down. Imagine this happening at 5000rpms, the crank consistently speeding up and slowing down. Now, connect that to a hub (pulley) that is rotating with far more mass than the crankshaft. As Neuton says, an object in motion stays in motion. So basically the hub is rotating more mass than the crankshaft is (which is btw connected to your pistons and rods!). That small bit of rubber located in their that Honda put in place (AKA, the harmonic balancers) keep the hub from moving directly with the crankshaft by allowing a little bit of give. By doing this, the hub rotating with the amount of mass that it has will not put extra stress on the crank and therefor breaking it in the end.

To put it simply, the harmonic balancer is a shock absorber for the engine and thus prevents the individual pulses from destroying everything in the engine. Take them out (IE UR or AEM pulleys) and you're just killing it.

All engine dampner or motor mounts will do is keep YOU from feeling the impulses... your engine feels every single one of them.

 

Um you can't have differing harmonic waves on a balanced engine, so NO it is NOT a harmonic balancer, no matter how much you would love to think so. I agree that the rubber serves a small purpose and the engine dampner absorbs vibrations which is what is created by the fuel and air igniting.

So do engine mounts and an engine dampner.

 

that's an interesting post.
i have talked to a mechanic that said that they (small engines like in hondas) do not have harmonic balancers. but i think he was just a shade above "shade tree" anyway.
i just rebuilt a 88 honda 1493 cc.
did not think of the 2 parts and did not see the rubber layer. or is it hidden ??