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Topic Review (Newest First)

  • 26-05-2016, 21:53
    nikb
    Have you tried clamping off each wheel in turn with a brake pipe clamp, this would hopefully show up if it was a braking issue
  • 25-05-2016, 23:25
    trevelyan
    dont know if this will help. but from time to time we have cars failing mot with a brake imbalance that cant be solved with brake repairs. occasionally this is rectified by resetting the tracking. so your theory of front end geometry could result in one brake working harder than the other. to be fair ive never seen it on a beam axle, only on ifs, but it may apply.
  • 21-05-2016, 10:56
    ivanhoew
    sounds like a good plan , i know that with my turbo '72 mini any increase in scrub radius is terrible ,i was taken for a ride in a turbo mini with 7x10 splits on it and lots of outer rim ,and when accelerating hard in 3rd it would go right 2 metres and forward a metre lol.

    , on mine i machined the wheels/hubs etc to reduce it 10mm and it was better , but stock scrub would be best ,you cannot get the same scrub as that axle had on it originally can you ?


    regards
    robert
  • 21-05-2016, 10:32
    redoxide
    Quote Originally Posted by ivanhoew View Post
    "and if you let the wheel go ( walking pace) it spins full tilt all the way left "


    that would suggest the castor angle is going the wrong way .can you measure the castor angle?
    I haven't measured the castor angle but I can tell you that there is castor there the axle is visibly tilted back, the thing is it drives and steers and return steers fine .. its just this pull that's a mystery... will be swapping wheels and ditching the spacer/adapters later today to sort out the scrub radius... well see how it reacts to that
  • 21-05-2016, 09:08
    chaley
    When you test the brakes are you doing it in the same place? I know it's not just happening when you have it, but is the car darting to the kerb each time? Could it be the camber in the road is not helping with poor castor on the axle? Try driving on the wrong side of the street and see what happens? Maybe? Under full braking there could be enough dive to sort out the castor? (note use of lots of question marks )
    From experience with Tetanus on deep dish wheels, it would dart all over the place and would pull which ever way you had the wheel pointed under braking, proper et wheels sorted it out straight away. ( things you remember are being propted. Well it was almost 20yrs ago o.O )

    Chaley
  • 21-05-2016, 07:31
    ivanhoew
    "and if you let the wheel go ( walking pace) it spins full tilt all the way left "


    that would suggest the castor angle is going the wrong way .can you measure the castor angle?
  • 21-05-2016, 00:38
    redoxide
    Quote Originally Posted by robo1 View Post
    Have you still not found time to shove the car in the brake rollers? For the wheel to be wrenched out of your hands the way you say it does would point to a serious amount of scrub radius , does the car have big offset rims?

    Bob
    Now Bob, you and I are singing from the same hymn sheet... I was staring at the car today and going through everything in my head. I always mentioned we were missing something very obvious .. and there it was

    Scrub radius... I was trying to explain it to my buddy but he wasn't getting it and I wasn't seeing what could be causing it ... but It struck me ...

    The car does run skinnies, 550 /16s if I remember right, but not only that, the obvious bit .... wheel spacer/ adapters around an inch and a half maybe 2 inches thick...

    When he went away I got to thinking why it should do this with no other eliminated reason... Its also the only part that's been common between both brake set ups and still remains on the car that can effect the geometry and cause a pull on the wheel like that ...

    were going to shift the wheels off it and drop on some deeper off set rims and /or ditch the spacers .. I'm keeping my fingers crossed this is the answer... It has to be something as simple as that that was staring me in the face but it didn't register.... I'm not 100% sure but I think my buddy is coming around to the fact that the car might benefit from a rebuild, just to put a few things right without messing with the look of the car...

    Its definitely the fastest car in the Valley, the valley of Strathmore
  • 20-05-2016, 22:06
    robo1
    Quote Originally Posted by redoxide View Post
    Yep cross steer, but It doesn't have any bump steer, Ive driven other rods, mainly with independent fronts and some were scarry to drive they had such bad steering and horrific bump steer ..

    My own beam axled cars had forward steer and one TCI based chassis with vega cross steer none of them bump steered, the best one was a B coupe with VW split screen box it steered like a dream and had loads of feedback, A roadster had a VW box too but a bay window, steering was heavy but never a problem drove great, A coupe had vega , had the usual vagueness about it but never wandered or bump steered ... This car drives OK its a bit wandery and vauge I feel, but it doesn't bump steer or pull or play up at all until you dab the brakes a few times ..... then after say four or five dabs you really have to put serious effort into pulling the wheel right to couter the pull to the left and if you let the wheel go ( walking pace) it spins full tilt all the way left ... and quite violently at that... Hmmm kinda like bump steer I suppose , but without the violent jerk that often manifests itself, and it would appear only when you brake .. a brake induced slow acting gradual bump steer...
    Have you still not found time to shove the car in the brake rollers? For the wheel to be wrenched out of your hands the way you say it does would point to a serious amount of scrub radius , does the car have big offset rims?

    Bob
  • 20-05-2016, 20:25
    redoxide
    Quote Originally Posted by JackGriffin View Post
    Vega box = cross steering. Does it have a panhard bar? Not sure if a lack of one would cause these symptoms, but if the drag link and tie rod angles were wrong, braking could cause bump steer?
    Yep cross steer, but It doesn't have any bump steer, Ive driven other rods, mainly with independent fronts and some were scarry to drive they had such bad steering and horrific bump steer ..

    My own beam axled cars had forward steer and one TCI based chassis with vega cross steer none of them bump steered, the best one was a B coupe with VW split screen box it steered like a dream and had loads of feedback, A roadster had a VW box too but a bay window, steering was heavy but never a problem drove great, A coupe had vega , had the usual vagueness about it but never wandered or bump steered ... This car drives OK its a bit wandery and vauge I feel, but it doesn't bump steer or pull or play up at all until you dab the brakes a few times ..... then after say four or five dabs you really have to put serious effort into pulling the wheel right to couter the pull to the left and if you let the wheel go ( walking pace) it spins full tilt all the way left ... and quite violently at that... Hmmm kinda like bump steer I suppose , but without the violent jerk that often manifests itself, and it would appear only when you brake .. a brake induced slow acting gradual bump steer...
  • 20-05-2016, 20:10
    redoxide
    Quote Originally Posted by garagebench View Post
    How about Weaker leaf spring tempered different end to end / twisted missaligned axle
    I considered swapping the entire front end out of it and dropping in mine just eliminate any axle /spring issues ... I didn't have time to do all that buit I can see it happening ...

    still got to drop if on the brake rollers ,I will eat my hat if there is a brake issue ... its nothing physical in the brake set up, all the components are sound so I cant see an issue,, and remember it did the same with a whole different brake set up on there previously....
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