chunkielad
|
| posted on 7/2/05 at 01:05 PM |
|
|
McSorley and Sierra front end....
Don't worry we aren't going over old ground here again....
If you have a sierra back end and want the same track width at the front, could you use standard book bones and just add 2" width either side of
the chassis at the front? Would that cause any problems with bumpsteer etc?
I just thought that if getting larger wishbone measurements to make your own, is as hard as it is, standard size bones are there for everyone and
apart from body work changes, it may be a good option.
|
|
|
|
|
britishtrident
|
| posted on 7/2/05 at 01:15 PM |
|
|
Longer wishbones should reduce the bumpsteer a tiny bit.
If you want to build your own longer wishbones don't try to extend the book design GTS or MNR sell very nice plates and other bits for making
much better ones up at a very reasonable price.
[Edited on 7/2/05 by britishtrident]
|
|
|
chunkielad
|
| posted on 7/2/05 at 01:18 PM |
|
|
Thanks mate - the point is to NOT extend any bones though - just move them out 2" each side.
|
|
|
britishtrident
|
| posted on 7/2/05 at 01:32 PM |
|
|
Now I understand yes it will reduce bumpsteer quite a bit but the stiffnes of the brackets will need serious consideration.
Another area it might cause a snag is the SVA test --- sharp projections.
On my own chassis the lower wishbone is 0.5 inch longer and the rear pivots are moved out to the outside of FU1 and FU2 while the front pivots are
extended out, the top wishbone has been redesigned to suit and a lot of minor changes made to the chassis to stiffen and reinforce the lower pivot
bracket area.
On my own car also moved the upper wishbone pivots upwards by a little to lower roll centre as I intend to use an anti-roll bar at the front.
|
|
|
chunkielad
|
| posted on 7/2/05 at 01:34 PM |
|
|
Is there any real need for anti roll bar on such a light car?
I'd have though that with such a light weight and it being so low, there'd not be too much roll anyway.
|
|
|
britishtrident
|
| posted on 7/2/05 at 01:47 PM |
|
|
Roll is caused by the difference in height between the height of the centre of gravity and the axis of roll, the axis of roll is an imaginary line
joining the front and rear roll centres. By lowering the front roll centre I am making the car roll slightly more, I also intend using quite soft
springs at the front to improve the ride to put the roll stiffnes back in I am adding a fairy soft anti roll bar on the front which has the
advantage of being adjustable to let me trim the understeer/oversteer without having to change the springs. :-)
|
|
|
chunkielad
|
| posted on 7/2/05 at 02:48 PM |
|
|
Very clever - I can get my head round engines and get through it. I can sort body work out no problem but suspension seems to be a black art!!!
If I add weight to the vehicle, would I effectively lower the roll centre and hence need a roll bar more than if it were lighter?
I suppose I actually know the answer to this really but just to clarify....
|
|
|
britishtrident
|
| posted on 7/2/05 at 04:53 PM |
|
|
Depends on the height you add the weight add --- MGB GT rolled a lot more the than open top because all the weight was added high up raising the
centre of gravity.
|
|
|
chunkielad
|
| posted on 7/2/05 at 05:16 PM |
|
|
Get it now cheers mate 
|
|
|
