Okay yet another question. I was looking at an unorthodox ss pulley kit for my 03 civic 1.7l. My question is on the crank pulley is there enough room to pull the stock pulley off and put the unothodox pulley without picking the engine?

 

why would u want those on (im guessing here) a stock engine :eh:

 

You don't need those. Spend the money on something else. But yes you can get the crank pulley off without pulling the engine. You can try an impact wrench or a crank pulley tool.

 

So there is no decent gain from reducing the weight from the crank? And yes its a stock engine I see no reason to put a new engine yet this is long term project still have a 150k to throw on the engine before I swap it out just wanting to get a little more HP and a little more gas mileage. Plan on working on suspension and having that done before I get to far into it.

 

Yeah, it's really not worth it. Just use that money towards a nice suspension or LCA's or something.

 

There is a dyno difference with the UR pulleys, depending on the model of the car. You'll gain some hp and torque out of having pulleys, there's not drawbacks, only gains all the way across. I gained around 5whp with just the Underdrive Crank Pulley. I bet they'd work best with Superchargers. I recently bought a p/s pulley, all i need is an alternator pulley and i complete my set. They're nice under the hood too.

 

this is utter and complete dogshit...and yes there are drawbacks to underdrive pulleys...changing the diameter of a pulley greatly increaes wear on parts that were designed with a different pulley size intended to spin them within a certain range. Also the underdrive crank pullies manufactured are nowhere near as well balanced as the stock pulley. You can end up doing alot of damage. Also this claim of 5whp from an underdrive pulley is utter and complete bullshit.

 

Okay okay... wow i better not drive fast if these items (a.c. and p/s) need to be operated at a certain speed. According to your logic, faster speeds, turbo, superchargers would destroy everything that the crankshaft spins.

These systems are driven by the crankshaft speed. Also the Alternator is NOT underdrived by these pulleys on several models.

They're not harmonically balanced, that will only reduce longevity in the long run. I don't think people mod their engines for racing and expect it to last for ever. 5whp isn't a lot but it's been proven on the dynojet and for the price it's nice.

 

underdriving the crank is detrimental to engine life keep that in mind

 

actually under driving your P/S and Alternator does put alot of stress on the components. Your logic behind the turbo and superchargers is retarded. A: a turbo isnt spun by the crankshaft...B: the speed at which a supercharger spins is directly proportional to the diameter of the pulley. Changing pulley size therefore dictates the amount of pressure created by the supercharger. That is what it is for. Now your alternator and P/S pump are made to run within a certain RPM range dictated by the diameter of the crank pulley and the diameter of the pulley on said device. When you underdrive you effectively spin the p/s pump and or alternator faster than they were ever intended to be spun, and for lengthy periods of time.

Please stop giving shitty advice out because you think you know what the fuck you are talking about. You wanna underdrive your shit...thats fine its your car. Do not however try to shoot down what other people have to offer based on real life experience and knowledge because you think you got 5whp out of an overdrive pulley.

now if you want to get lighter weight pulleys but keep the same effective diameter than by all means. Less rotational mass is always a good thing.
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