typesiracing
Senior Member
I know lightweight crank pulleys exist, however, they still have spots for accessory belts. Does anyone know if there is a crank pulley with only one spot on it for the alternator belt.
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Originally posted by typesiracing@Jan 5 2004, 07:53 PM
thats what i was thinking of doing but i guess you are right about the gains......what's damping factor
cool thanks for all the help guys.....type r sound like the way to go
Originally posted by StyleTEG@Jan 7 2004, 12:05 PM
cool thanks for all the help guys.....type r sound like the way to go
No, because like I said it still does NOT have a pulse dampener. If you are going to run a pulley with out a pulse dampener, you might as well get the unorthadox since its lighter.
The pulse dampener is compressed rubber between the PS and the Alternator rib. If you were to machine off the other two ribs you would have to leave enough of the rib on the AC to keep the rubber in tackt.
Let me begin by saying that we have always called the pulley on the accessory drive end on the Honda cranks Harmonic Balancers. People never seemed to understand what we were talking about and so the word "pulley" was frequently used to avoid confusion. If you look carefully at a Honda "pulley", 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, which is highly compressed and sandwiched between them. Why rubber? If you notice, many four cylinder engines over the years have used counter rotating shafts to help make the engine "feel" smoother. Reciprocating internal combustion engines and especially in-line four cylinder versions, all produce shock pulses, which are very apparent to the occupants of the car. Every engine produces a shock pulse each time an individual cylinder fires. So, in the case of the four cylinder variety, there are four large individual pulses for each 720 degrees of crank rotation. Each time there's a pulse, it causes the internal components to do a rapid acceleration-deceleration event. When you consider the mass of all the internal components and visualize all these parts stopping and starting during their reciprocating and rotating motions, the additional stress "spikes" tend to make it all the more reason for one to wonder how any of it can work for any length of time. The harmonic balancer is made with the rubber coupling so that, when the individual "spikes" occur, the inner portion may move with the crank, but the rubber connected outer ring's mass helps prevent the hub and crank from going as far or as fast during the spikes or pulses. Remember that the outer part had considerable mass, so it tends to want to stay in motion at the speed that it's traveling and that's why it can prevent excessive harsh motion by the crank and other internal parts. 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.
just because honda made one peice for the CTR engine, doesn't mean its what you should run on your daily driver.
When a cylinder fires, that crankshaft journal pulses forward (yes crankshafts flex), and that journal also rebounds. Every journal on the crank goes through the same motions, and the greater the engine's power, the more violent the pulsations.
Try to picture this now....the crank is rotating, but the individual journals are ocillating back and forth at the same time, meaning that there's vibration in the crankshaft. This vibration is transmitted into everything connected to the crank. Ask someone in the aircraft industry about the effects of vibration sometime.....it doesn't take much to break pieces that appear very substantial...and the same is true about the bottom end of an engine.
There is a lighter 1.8 lb chromoly steel Honda N1 crank pulley made for the N1 CTR race cars. It has the 3 timing marks just like the stock pulley but the accessory (eg. power steering and A/C ) grooves for the belts have been cut off to lighten it. This is a factory crank pulley made for racing.
Originally posted by KFBhonda@Jan 8 2004, 10:57 AM
i read all those words on the last post, including the bulky quote.
it said nothing.
the honda ctr pulley was designed for a daily driver.
the car is called a civic type-r.
just because honda made one peice for the CTR engine, doesn't mean its what you should run on your daily driver.
i guess the aftermarket companies always know better... :roll: :roll:
Originally posted by StyleTEG@Jan 8 2004, 01:33 AM
Sigh, again..
just because honda made one peice for the CTR engine, doesn't mean its what you should run on your daily driver.