660Z Posted June 16, 2002 Share Posted June 16, 2002 IM CHANGING MY R180 OVER TO AN R200 AND ON THE R200`S FRONT CROSSMEMBER THERE`S A PLATE WITH WEIGHTS THAT ARE POSITIONED UNDER THE DIFF. I COULD UNDERSTAND IF THEY WERE MOUNTED TO THE DIFF MOUNT FOR COUNTERBALANCE BUT I JUST DON`T SEE THE PURPOSE OF THEM. DOES ANYONE REUSE THEM? IM GOING TO USE THE ORIG.240Z CROSSMEMBER BECAULSE IT LOOKS STRONGER AND HAS THE BOLT HOLES ALREADY THERE FOR THE MOUNT BRACE. SO IM JUST WONDERING THANKS...MARK Quote Link to comment Share on other sites More sharing options...
660Z Posted June 16, 2002 Author Share Posted June 16, 2002 sorry it`s a work thing Quote Link to comment Share on other sites More sharing options...
Guest scca Posted June 16, 2002 Share Posted June 16, 2002 i believe the iron on the mount was to help absorb vibrations in the driveline from the factory Quote Link to comment Share on other sites More sharing options...
Mike C Posted June 16, 2002 Share Posted June 16, 2002 I agree with Mike. It's like a bar end weight on a street bike. Keeps the vibrations down to a minimum. Quote Link to comment Share on other sites More sharing options...
CruxGNZ Posted June 17, 2002 Share Posted June 17, 2002 Hmm, I guess that makes sense. Didn't notice any difference after I took mine off though. !M! Quote Link to comment Share on other sites More sharing options...
Guest scca Posted June 17, 2002 Share Posted June 17, 2002 i have probably removed 25-30 of them on customers cars and no one has ever told me it is worse... Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 17, 2002 Share Posted June 17, 2002 My vega had one of those deals on the rear of the transmission, it was a cantalevered weight that hung about even with where the driveline goes into the rear of the tranny only below it. Guess it had to do with driveline harmonics or vibrations or whatever, ironic on a car that had a engine that shook like a one legged maytag on spin. Regards, Lone Quote Link to comment Share on other sites More sharing options...
CruxGNZ Posted June 17, 2002 Share Posted June 17, 2002 Yeah, I was curious about the same thing. I pulled mine off a while back, because I just didn't think it was doing anything. I would love to know why these weights were put on there, it makes no sense to me. Anyone know why? Oh yeah, 660Z, turn your caps lock off, otherwise it seems like you are yelling at us. !M! Quote Link to comment Share on other sites More sharing options...
Drax240z Posted June 26, 2002 Share Posted June 26, 2002 Sounds like a dynamic vibration absorber. Basically its a mass mounted on a spring (everything is a spring technically, even a thick piece of steel) that will move the natural frequency of the system away from the range where resonance occurs normally. For instance, you may have a diff with a natural frequency that coincides with 2500rpm cruising, adding this dynamic vibration absorber can move the natural frequency of the system so that it is at 750rpm, or 7500rpm for instance. As a result you don't feel or hear the resonance occuring as often as you would if it were a 2500rpm natural frequency... Sorry, I have a vibrations midterm in a few hours. Quote Link to comment Share on other sites More sharing options...
stony Posted June 26, 2002 Share Posted June 26, 2002 i thought it was a place to jack the car Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 26, 2002 Share Posted June 26, 2002 Any chance we can hook one of those to the exhaust system to stop the resonance? Regards, Lone Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted June 26, 2002 Share Posted June 26, 2002 Dynamic vibration absorber? I think aliens put it there as dead weight to slow your car down. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 26, 2002 Share Posted June 26, 2002 Originally posted by Lockjaw:Dynamic vibration absorber? I think aliens put it there as dead weight to slow your car down. Probably Toyota sneaked it into the plan, industrial sabattoge is such a nasty business (and so is my spelling ). Regards, Lone Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 27, 2002 Share Posted June 27, 2002 Page 1378 of 19th Edition of Datsun Folklore; paragrapgh 11 :"Self excersize. The diff gets stronger by working out with the weights. That is why these old 200 rear ends are so tuff. The 160 and 180 rear ends dis not come as heavily equipped and their workouts never produced the strength like the 200's." Quote Link to comment Share on other sites More sharing options...
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