Originally posted by SRV1 question for you guys, maybe you can help me understand this. why in the world would you take out balance shafts in a motor? i know what they do and i know they have some weight to them, but what are you gaining? why would you want to unbalance an engine? it sound like you want to destroy it or cut its lifespan in half. also, i assume you wouldnt be able to rev this thing high if removed. Ok you get 8 horses to the wheels. is it worth the trouble and the expense for the engine? i would find somewhere else to make my 8 horses. please someone explain this to me. maybe the new Nissans do something differently?
Originally posted by CopperSol between the maf and filter .... all you need to do is cut the adapter plate to the maf just enough to get rid of that ridge and the bypass valve will fit perfectly.
Good I was a little concerned it was the other way.
There is nothing to agree with that statement, it is wrong, it will not unbalance your engine. It is a race proven safe mod that gives 8-10 hp to the wheels when combined with JWT's windage tray pan baffle and 6-8 hp to the wheels when done alone.
i just ordered the kit. A friend of mine is going to do the install on nov 24. Then my club is having a meet at Gainesville raceway on dec 6th, so I will see what i get. I only have an aem and a universal exhaust. I am waiting on the aebs header and for greddy to come out with their exhuast.
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2002 Aztec Red Spec V - AEM CAI - Progress Springs - Enkei CDR9's (18in) w/Yokohama Parada Spec 2's 225/40/18Z - JWT Blance Shaft Removal Kit - Grounded Knock Sensor - UR Pulley - AEBS Header Pix Of My Car StreetWise Imports
Originally posted by morepower2 There is nothing to agree with that statement, it is wrong, it will not unbalance your engine. It is a race proven safe mod that gives 8-10 hp to the wheels when combined with JWT's windage tray pan baffle and 6-8 hp to the wheels when done alone.
Mike
But Mike why did the factory put it there? They freak about every penny that a car costs them to make, and this balance shaft assembly looks quite elaborate and expensive (remember 100k+ engines per year at least).
Logically you would think if the factory spent that kind of money on it, it's not for just creature comfort vibrational reasons, but for engine integrity/longevity.
Although I am not on the inside track with Nissan as you are, it makes no sense to me that they would do it as tight and bean-counter like as factories are. That is unless you can explain their reasons.
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Originally posted by Thomas Reynolds But Mike why did the factory put it there? They freak about every penny that a car costs them to make, and this balance shaft assembly looks quite elaborate and expensive (remember 100k+ engines per year at least).
Logically you would think if the factory spent that kind of money on it, it's not for just creature comfort vibrational reasons, but for engine integrity/longevity.
Although I am not on the inside track with Nissan as you are, it makes no sense to me that they would do it as tight and bean-counter like as factories are. That is unless you can explain their reasons.
Contact me privatly and take my word for it.
Mike
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Originally posted by morepower2 I can't talk about a lot of the specific details but I know its safe from race testing amoung other things.
Mike
Facts assuming the balancer assembly are "useless":
1. The parts are expensive to manufacture and install.
2. They are moving, and fast: they lower expected reliablity of the car.
3. They potentially lower the redline of the car.
4. They are parisitic dead weight: horsepower is stolen.
5. They lower gas milage.
Why on earth would they do this? If they wanted to slow the car down adding weight would have done it. Or better, use the ecu.
Please, someone destroy my facts or give me a good reason that they would do something every a person from marketing can see is foolish. My assumption is that they balance the engine in a critical way. (Like they do in almost all large displacement straight 4's)
Originally posted by Foof Why on earth would they do this? If they wanted to slow the car down adding weight would have done it. Or better, use the ecu.
Please, someone destroy my facts or give me a good reason that they would do something every a person from marketing can see is foolish. My assumption is that they balance the engine in a critical way. (Like they do in almost all large displacement straight 4's)
To reduce the vertical shaking moment, a chariteristic of in-line 4 cylinders is the main reason that the balance shafts were added. However due to the QR's low reciprocating weight, the shaking is not that bad. In fact its amazingly good for a 100mm stroke.
The NVH target for the QR was the VG30 so Nissan was trying all the tricks to get vibration as low as posible, hence the balance shafts, the ultra stiff block, real low reciprocating weight and the super heavy dual mass flywheel.
I am amazed to how smooth a QR with no balance shafts is. If you study what balance shafts do you can see that the are designed to cancel out up and down shaking, not damp harmonic twist of the crankshaft which can destroy an engine.
Even harmonic twist is usualy not an issue with an internaly balanced 4 cylinder untill somewhere over 8000 rpm.
Mike
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hey mike, i've been hearing things about addiding the pulley to the QR with balance shafts removed and that it is a bad thing to do.
I don't see how it could being that the engine is internally balanced. I just got the JWT kit today and will have it on sometime within a week or so. I will also be ordering the UR pulley and I want to make sure none of what I am hearing is true.
any info would be greatly appreciated.
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2002 Aztec Red Spec V - AEM CAI - Progress Springs - Enkei CDR9's (18in) w/Yokohama Parada Spec 2's 225/40/18Z - JWT Blance Shaft Removal Kit - Grounded Knock Sensor - UR Pulley - AEBS Header Pix Of My Car StreetWise Imports
Originally posted by Spec V Tuner hey mike, i've been hearing things about addiding the pulley to the QR with balance shafts removed and that it is a bad thing to do.
I don't see how it could being that the engine is internally balanced. I just got the JWT kit today and will have it on sometime within a week or so. I will also be ordering the UR pulley and I want to make sure none of what I am hearing is true.
any info would be greatly appreciated.
I feel that the pulley will be safe, enough thatif I had a spec v, it would be going on my car. Speaking to the UR guys at SEMA, they said their prototype made 8-10 wheel hp!
Mike
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There can only be one Icy Hot Stunta, Don't Hate.
I geuss I knew it was a vertical cancellation that the balancer harmonically dampens. I thought this might be the problem. (i.e. the motion that would rip up the engine.)
So you (morepower2) seem to believe it is a smoothness issue alone. In the competitive world of compact cars, this may be. Thanks for the response.
Actually, thanks for about 3 years of information. I've been a 1.6 lurker at sentra.net for about that long. Your completely scientific approach is second to none in the car info. world.
Now don't let it go to your head. Get back to work. There is no rest for the wicked.
Originally posted by morepower2 To reduce the vertical shaking moment, a chariteristic of in-line 4 cylinders is the main reason that the balance shafts were added. However due to the QR's low reciprocating weight, the shaking is not that bad. In fact its amazingly good for a 100mm stroke.
The NVH target for the QR was the VG30 so Nissan was trying all the tricks to get vibration as low as posible, hence the balance shafts, the ultra stiff block, real low reciprocating weight and the super heavy dual mass flywheel.
I am amazed to how smooth a QR with no balance shafts is. If you study what balance shafts do you can see that the are designed to cancel out up and down shaking, not damp harmonic twist of the crankshaft which can destroy an engine.
Even harmonic twist is usualy not an issue with an internaly balanced 4 cylinder untill somewhere over 8000 rpm.
Thanks
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