The Triumph Dolomite Club - Discussion Forum

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PostPosted: Sun May 13, 2018 7:25 pm 
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Location: Staines Upon Thames
I have tried to resolve this but I am getting nowhere so far.

I am running trackerjack brakes with Sierra discs and calipers. All new when fitted and probably only 2000 miles since. The car is lowered on Spax and polybushed.

Discs and pads checked and all seems ok.
Disc run out is 3 thou
I greased the guide pins.

Wheels look like they could have lost a weight but it has no shake at 100mph ( on the track of course )

Could it be something in the suspension ?
Is 3 thou still too much ?
Could the wheels be ok at speed but still give issues under braking ?

Any help appreciated.

At Goodwood next weekend but no time to sort it now.

Tks

Mick

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1980 Vermillion Sprint - 174bhp


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PostPosted: Sun May 13, 2018 8:06 pm 
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Location: Nr Kenilworth
3 thou is too much for me. I was always told to aim for 1.5 thou max. Ive said before on this subject,the hub to disc interface can affect this a bit and in my experience (2x TJ conversions) the hub needs gentle filing to mach the disc. Mark the hub to disc so it goes on the same way every time you strip and build it. (of course you can try all 4 positions first to get the lowest number. Even cruddy/dirty hubs can upset the numbers.
Just remove a tad of metal/crud for a good clean up and keep checking. Got mine to under a thou in the end, worth the effort.

Tony

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PostPosted: Sun May 13, 2018 9:05 pm 
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Location: Highley, Shropshire
I've fitted 4 sets of TJ now without a problem (must confess one set, on my Sprint, has not yet been tested) the set on the Carledo has done 10k + including trackdays, it will need new pads soon! But i'm pretty careful on assembly, making sure everything is spotless.

It definitely SOUNDS like disc warp though and 3 thou is right on the upper limit of what I would accept as viable.

FWIW, might be worth checking BOTH faces of the disc for "bulges" as this can give judders too, just tip-ex 8 or 12 marks around the edge of the disc and gather readings on both faces at each point and compare.

Steve

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2 door '73 Toledo with Vauxhall Carlton 2.0 8v engine OWF 797M (The Carledo)
'78 Sprint Auto with Vauxhall Omega 2.2 16v engine EGP 247T (The Dolomega)
'91 Cavalier 2ltr 8v auto
'95 Cavalier 2ltr 16v auto
Spectrum Auto Services, Servicing, Repairs, MOT prep. Apprentice served Triumph Specialist for 45 years and home of Maverick Triumph.PM for more info or quotes.


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PostPosted: Sun May 13, 2018 11:14 pm 
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Joined: Fri Oct 06, 2006 8:57 am
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Location: Auckland, New Zealand
A few thoughts from my experience:

I always adjusted the wheel bearings up so that I had zero play, but just ran freely. Sometimes I used shims so I could get a setting between the turns of the castellated nut. Good grease and Timken bearings (Chris Witor).
I tried to get as close to zero run out on the discs. Thoroughly cleaned both surfaces and used small pieces of wet paper between disc and hub for the final adjustment. Only wet so they stick while disc is refitted.
Tyres would need a cleaned up with a wire brush to remove rubber they had picked up from the track and the fronts would need rebalancing often.

I would do the above after every second race meeting, or sooner if any issues arose.

I also found that the poly bushes on the front drag struts (mine are adjustable) would wear /tear themselves to bits unbelievably quickly so I had some very hard / tough ones made. They have lasted well and tightened up the front end.
Quote:
Could the wheels be ok at speed but still give issues under braking ?
Yes, absolutely. Braking on the track is always full on and changes the dynamics significantly. Any deficiency will be magnified hugely.

There's an example of steering judder in my car in this video https://www.youtube.com/watch?v=6-iVG8Gtgo4

Geoff


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PostPosted: Mon May 14, 2018 12:14 pm 
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With this appearing in the 'last post' section of my browser titled "Steering judder under bra..." I had been hoping for a somewhat different content of discussion!


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PostPosted: Mon May 14, 2018 12:15 pm 
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Location: Over here...can't you see me?
https://www.youtube.com/watch?v=UiU_HVl_dH4 :)


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PostPosted: Mon May 14, 2018 12:48 pm 
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Location: Huntingdon
Oh my! :boggle2:

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Current fleet: Triumph Dolomite Sprint '75, Daihatsu Fourtrak, Honda CG125, Yamaha Fazer 600, Shetland 570

Disposal fleet: Golf GTi 16v MK3 Anniversary

Past fleet: Triumph 2000, Lancia Beta Coupe, BL Mini Clubman, Austin Metro, Vauxhall Cavalier MK1 & MK2, Renault 18 D, Rover 216 GSI, Honda Accord (most expensive car purchase, hated it on pickup from dealer, was made out of magnetic metal as only car I've ever been crashed into, 4 times), Golf GTi MK3 16v x 3


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