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Thread: Prop out of balance?

  1. #1
    Guest DeanS15's Avatar
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    Prop out of balance?

    A couple of years back I had a hyper single clutch fitted by a specialist and ever since I've had a vibration off throttle between 3500-3000 rpm. Anyway I don't believe it's a quirk of the clutch as it's been fitted to others and there haven't been reports of this problem, plus the fact that the gearbox is still fine and performs well, as does the diff. Anyway, seeing as the clutch was the only thing drivetrain related that was changed I'm starting to wonder whether the prop shaft was rotated at the centre joint and wondered if my symptoms would likely be caused by this? The only other thing I can think of (but it's with a limited understanding of exactly what it does) is whether the spigot isn't located properly? If I was to rotate the joint to see if it gets any better, is there a danger from doing so? Cheers in advance for any info

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    Guest jon200's Avatar
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    The prop will have been balanced off the car so there should be no difference which orientation it sits in. At work we balance shafts to 25,000rpm which are then fitted to other equipment, normally things are balanced between centres so cant be done on the car. mines been off a few times and i know its gone back in different positions with no problems.
    Whats the centre bearing like? could be a damaged flange possibly.

  3. #3
    Home Counties Rep LED sandwich's Avatar
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    I had this on my s13 when i mis alligned the prop after re fitting, i think they are balanced as a pair so if there not put back on in the correct orientation they will wobble.

    You could try undoing and rotating it as there are only 3/4 options left.

  4. #4
    Guest DeanS15's Avatar
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    Well here's the strange thing - when it starts to vibrate there are two ways to silence it.... Reapply the throttle or push the clutch in. In both cases the noise dissappears instantly. Thats why I'm confused-the prop will still be spinning - unless the particular resonance range is literally in that rev range without load on it..... There is nothing physically touching anywhere that could produce this noise/vibration. I just did a full refurb and stripped and refitted everything . I kind of hoped it was something vibrating against the body but that's completely eliminated now

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    I <3 BBS LM Actual_Ben_Taylor's Avatar
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    Possibly dual-mass flywheel on its way out?

  6. #6
    Guest DeanS15's Avatar
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    That's in my loft, the exedy is a clutch/flywheel all in one kit.....

  7. #7
    Home Counties Rep LED sandwich's Avatar
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    is it just a noise? or can you feel it vibrating?

  8. #8
    Guest DeanS15's Avatar
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    It's both really, it's like a vibrating noise. Something is clearly resonating but I'm stumped which is why I suspect it could only be prop related unless the clutch was incorrectly fitted but then that functions perfectly....

  9. #9
    Guest DeanS15's Avatar
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    Aaron, what were the symptoms of yours mate?

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    Did you get this sorted? as mine is the same after converting to manual. Just ingnoring it at the mo, as it tends to only happen between that rpm on corners, possible center bearing?

  11. #11
    Guest Hesky's Avatar
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    Hi Dean, did you get to the bottom of this?

  12. #12
    Guest DeanS15's Avatar
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    In a word, no. It's been like it ever since I spent 4+k having work done with a trusted tuner on here. I don't know what was done to my car but ever since I picked it up it's had this vibration... I've since tried a different clutch and flywheel, different gearboxes (x2), 2 props (both balanced by prop specialists) and the problem still persists.... I originally took it back to the tuner but he said it would start coating me money for him to delve into the source and I couldn't afford it nor be bothered to argue. It's basically taken a lot of the enjoyment out of driving the car and I know for certain it's not exhaust, bush or panel related because I've had the car in a million bits since then... Sorry for the rant but I'm at my wits end with it...

  13. #13
    Guest Hesky's Avatar
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    In a way its comforting to know I’m not the only person that has been losing their hair over this issue! See mine to vibrates under decel, but also viciously vibrates under acceleration at low rpm, this is the one that has concerned me the most and has basically prevented me from driving the car for the last couple of years while I try changing countless parts. I’m simply not happy driving it until its sorted

    Like yourself it all started after fitting a new performance clutch and flywheel. I’ve since tried countless aftermarket clutch and flys. Un-sprung, sprung hub, paddle and hd organic clutches. Light and heavy pressure plates. lightweight, less lightweight flys and standard. Every combination other than completely stock cause these frustrating vibrations, although if you concentrate you can definitely hear/feel the vibrations even with the stock fly and clutch setup, just far less detectable. Could quite possibly have been present since the day I bought the car and just never noticed it.

    After giving up with trying different clutches to resolve the problem I moved onto the gearbox, I’ve now tried 3 boxes, original s14a, a rebuilt s14a stock box and an old s14 box. All do the same except the s14 box whined due to an oil starved input shaft gear.

    I’ve also tried 3 different diffs, stock s14a viscous, s14a auto diff and an s15 helical in a s14a case. Also rebuilt the rear subframe with new bushes all round including diff. Fitted new engine and trans mounts as well.

    The only things I haven’t changed is the propshafts, although I got these checked over by a transmission guy who said they were fine and it was my gearbox that was at fault.
    I think I will still get the probs replaced or at least rebuilt with new u-j's and complete balance, centre bearing will also be replaced.

    Its mental really but I’ve simply not been able to enjoy the car because of this, I know it’s not me being too fussy as my mates easily pick-up on the almighty racket when I take them for a spin and they make comments like “what the hell was that?!” the vibrations are that aggressive!
    Last edited by Hesky; 14-05-2012 at 19:24.

  14. #14
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    i also have a vibration... but mine is at about 60mph, which surely will be either wheel or prop realted. the prop spins in relation to the wheel speed, not engine speed. mine also started after manual conversion but i cant feel it through the gearbox, which i thought i would be able to if it was the prop.. im thinking maybe rear wheel out of ballance...

  15. #15
    Guest DeanS15's Avatar
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    Ah Hesky, that does not sound good and doesn't fill me with confidence of getting to the bottom of my issues of all the specialists/experts on here it seems this is a really rare phenomenon as not many people seem to know seem to know anything about it let alone have a solution??!! I'd have thought someone would have come up against it and sorted it...

  16. #16
    aka Droolingorc Ghazoobe's Avatar
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    I know its a pain to do, but maybe worth swapping the clutch+flywheel for a standard one just to see if it stops?
    bovvered?

  17. #17
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    if it relates to engine speed it cant be the prop...

  18. #18
    Guest DeanS15's Avatar
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    The standard clutch and flywheel won't work any more because I'm using s14 box now, but it shouldn't make a blind bit of difference because its still an sr with an sr flywheel and clutch, otherwise everyone would have these problems I know it's not the prop now having tried 3, the only thing I've come across is something to do with compression strokes being out of harmony with the drivetrain but I know very little about that and surely the tuner would be aware of such a thing should it come up?

  19. #19
    Guest Hesky's Avatar
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    Quote Originally Posted by Ghazoobe View Post
    I know its a pain to do, but maybe worth swapping the clutch+flywheel for a standard one just to see if it stops?
    I’ve tried the original clutch and fly setup and the vibrations are very much reduced, but as I said are still detectable if you listen for it.

    Basically I’ve tried quite a few combinations already. I've tried the standard original fly but mated up to a tame organic performance clutch, I’ve tried a lightweight performance flywheel with a stock clutch setup and every damn combination other than totally stock causes high level vibrations.

    Thing is sticking with a weak stock setup simply isn’t an option for me

    Its mad really, but a very tame stock fly and organic clutch setup right up to a silly 5kg racing flywheel and unsprung 6 puck racing clutch setup all produce exactly the same amplitude of vibrations!
    The only why you can tell each setup apart is the varying levels of drivetrain chatter and drivability you get with each setup.

    I’ve got so obsessed with it I have a stock pile of Nissan pilot bearings and new release bearings to make sure I'm not carrying over a part that has failed. even tried different bellhousing bolts and shim

    Testing and swapping transmission components has become less of a pain and more of a necessity to diagnose this issue

  20. #20
    Guest hooky's Avatar
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    Quote Originally Posted by Karlos28 View Post
    if it relates to engine speed it cant be the prop...

    This^^^...

    Its been said a couple of times now, If its RPM related in more than one gear then it MUST be gearbox/clutch/engine.

    If The prop/diff/wheels are at fault it will happen at a certain SPEED not RPM.

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