MG MGB and MGB GT Tech Talk
Looking to overhaul&lower my sons 78B. First off which bushings stock rubber,V8 rubber,poly,or prothane? He would also like to lower it 2". How about 1" dropped spindles and a lowering kit from Moss. What spring rates and length? The car will be used for pleasure and local trips (ok maybe a few long ones) some autocross etc. Not a daily driver. Thanks Rick
I'd go with the urethane which ought to last longer than rubber (i.e. "V8"), as far as harshness, I've never ridden in a B that wasn't harsh. No suspension travel means harsh. s'way it is.
just remember to use that silicone grease they give you lavishly. And maybe buy another tube and use more. (you can use the leftover stuff in the electrical connectors to keep out water and crap, really needful there!) And don't tighten things until it is back on the ground and rolled around for awhile to get things settled.
Hi heres what fitted to our 1976 mgb gt road car before converting it to a FP race car,
Urethane brushes all road (red MGOC)
Moss race 680lb froint springs (the spring rate was fine for the road but they were too short so we fitted 2x moss spring spacers each side)
7/8th front anti-roll bar
standard rear anti-roll bar
standard rear springs with lowering blocks
25% uprated dampers all round
This worked really well on the road and wasnt too harsh, however "spirited" driving did highlight the issues with lowering a RB MGB
The problem is lowering a RB MGB especially the front changes the geometry in particular the bump steer. This is fine for normal driving as mentioned above.
There are ways around this which i would be happy to discuss if you were keen but it is more involved.
Hope this is helpful
Tom
x2 what the other guys said, but I will add that I would advise against lowering 2". I found a 1" lowering was great, did not create really big bump steer problems and only the occasional light scrape on a speed bump (military bases seem to have rather tall speed bumps). If it was lowered 2" I think you'd experience many, many scraping issues and maybe even some tire rub issues.
David