B GT Suspension : MG Motorsports Forum : MG Experience Forums : The MG Experience

B GT Suspension #1
TomBrooksuk Tom Brooks Leicester, Leicestershire, United Kingdom 1967 MG MGB GT	Posted: January 26, 2012 05:34AM Registered: 2 years ago Posts: 591

As promised (quite awhile ago!) here are some pics of the coil over suspension for the BGT. We are working on fitting the rear suspension today, the front is all but complete.

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Re: B GT Suspension #2
TomBrooksuk Tom Brooks Leicester, Leicestershire, United Kingdom 1967 MG MGB GT	Posted: January 26, 2012 05:37AM Registered: 2 years ago Posts: 591

A few more....

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Re: B GT Suspension #3
TomBrooksuk Tom Brooks Leicester, Leicestershire, United Kingdom 1967 MG MGB GT	Posted: January 26, 2012 05:38AM Registered: 2 years ago Posts: 591

Right back to work re-fitting the gearbox and prop shaft!

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Re: B GT Suspension #4
MGST Andrew Metford Perth, Australia 1966 MG MGB 1973 MG MGB GT 1974 MG MGB GT	Posted: January 26, 2012 06:09AM Registered: 6 years ago Posts: 807

Where did you get all that from?? Never seen anything like it. You running a 3 link rear, with leaf springs as well?

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Re: B GT Suspension #5
blackmgb Fred McConnell Hollidaysburg, Pennsylvania, USA 1992 Mazda Miata NA "MAC"	Posted: January 26, 2012 06:48AM Registered: 6 years ago Posts: 5,193

I recognize that blue and satin black. Beautiful stuff!

2012 SCCA FP MARRS Champion

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Re: B GT Suspension #6
JP12 Joe Phillips Bristol, United Kingdom	Posted: January 26, 2012 06:48AM Registered: 4 years ago Posts: 166

Looking good Tom.

Where does the top of the coilover unit on the rear suspension fix on the chassis?

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Re: B GT Suspension #7
JP12 Joe Phillips Bristol, United Kingdom	Posted: January 26, 2012 06:56AM Registered: 4 years ago Posts: 166

The rear suspension design looks very similar to the Colin Chapman Lotus 7/Lotus Cortina design but with more bracing on the rear axle to prevent the diff casing from flexing under load.

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Re: B GT Suspension #8
Speedracer Hap Waldrop Greenville, SC, USA 1967 MG MGB "The Biscuit"	Posted: January 26, 2012 07:59AM Registered: 7 years ago Posts: 20,301

Tom, I'd be interested to seeing the rear supsension photos when you get all the links hooked up. I worked on a couple of cars with the wishbones, both Spridgets, both use the original drain plug area of the rear housing for the rear attachment point of the wishbone, one of the Spridgets I worked on the person who did the fab work, made no alternate diff drain, so that was huge PITA, I see Dave had added a alternate diff drain plug thumbs up

Hap Waldrop
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Re: B GT Suspension #9
fast-MG.com Dave Headley Cortez, 4 corners, Colorado, USA	Posted: January 26, 2012 09:04AM Registered: 4 years ago Posts: 3,209

Hap, I learned the hard way that attaching the rear of the A-frame through the banjo drain plug will quickly lead to housing cracks. The way this is done is to bridge the side loads out to the tubes via the structure you see here. smileys with beer

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Re: B GT Suspension #10
Filth and Greed Motors Paul Gaylo Corning, NY, USA 1959 MG MGA 1500 1970 MG MGB GT	Posted: January 26, 2012 09:59AM Registered: 5 years ago Posts: 1,379

Fascinating. What is the prevailing wisdom on wishbone, triangulated type rear suspension? I thought there were issues with this. However, looking at this it seems like a super simple good idea. Lightweight, simple with the benefit of having the roll center really low.

The suspension is like a 3-link minus a lateral control device. Instead the middle link serves as the lateral control. Articulation should be fine without bind. I would like to know where the upper links attach to the chassis.

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Re: B GT Suspension #11
bills Bill Spohn W. Vancouver, BC, Canada 1956 MG MGA 1958 MG MGA Twin-Cam 1962 MG MGA MkII Coupe 1965 Jensen CV8 1969 Lamborghini Countach → more	Posted: January 26, 2012 10:43AM Registered: 8 years ago Posts: 9,135

In reply to # 1966834 by JP12 The rear suspension design looks very similar to the Colin Chapman Lotus 7/Lotus Cortina design but with more bracing on the rear axle to prevent the diff casing from flexing under load.

That was exactly my reaction. Lotus found that the A frame tended to fail. The switched to semi-elliptics and traction arms in the Mk 2 Lotus to fix it. Hope this application on the MG does better.

When I designed my MGA rear suspension, I purposely avoided an A arm for location and opted for lower traction arms, one upper locating arm and sliding spring plates a la Huffaker.

Bill Spohn www.rhodo.citymax.com/carstuff.html
1958 MGA Twincam (race car), 1962 MGA Deluxe Coupe
1969 MGC roadster, 1957 Jamaican MGA
1965 Jensen CV8, 1971 Jensen Interceptor
1969 Lamborghini Islero S, 1988 Fiero GT turbo
2009 Pontiac Solstice GXP Coupe
West Vancouver BC

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Re: B GT Suspension #12
TomBrooksuk Tom Brooks Leicester, Leicestershire, United Kingdom 1967 MG MGB GT	Posted: January 26, 2012 11:12AM Registered: 2 years ago Posts: 591

Two final pics of the day,

I will post some pics of the upper links when they are finally attached, we need to set the axle in the car at its final height relative to the body prior to deciding exactly where the upper arm slots will go to ensure we have a reasonable amount of adjustment on the angle of the upper arms.

The body of the car is set on blocks in the final two pics at its approximate final ride height (dictated by the front suspension)

As for the rear coil overs they will be mounted as part of the rear roll cage within tower structures, these will allow vertical adjustment. pics to follow.

Tom

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Re: B GT Suspension #13
fast-MG.com Dave Headley Cortez, 4 corners, Colorado, USA	Posted: January 26, 2012 12:53PM Registered: 4 years ago Posts: 3,209

Paul and Bill, the lower A-frame has proven it's mettle in several other race cars that I've done. One key is that it is triangulated for stiffness and made with 1 1/4" OD, .125" wall tubes. The rear Heim joint is 3/4" shank, 5/8" eye attached to the axle in double shear.

Low roll center and simplicity are the big advantages. Upper links are angled(side view) to control roll steer.

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Re: B GT Suspension #14
bills Bill Spohn W. Vancouver, BC, Canada 1956 MG MGA 1958 MG MGA Twin-Cam 1962 MG MGA MkII Coupe 1965 Jensen CV8 1969 Lamborghini Countach → more	Posted: January 26, 2012 12:55PM Registered: 8 years ago Posts: 9,135

Yeah - IIRC the weak point on the Lotus was the attachement at the diff. The pictures above show a damned skookum attachment point on the MGB, so it should hold up pretty well.

Bill Spohn www.rhodo.citymax.com/carstuff.html
1958 MGA Twincam (race car), 1962 MGA Deluxe Coupe
1969 MGC roadster, 1957 Jamaican MGA
1965 Jensen CV8, 1971 Jensen Interceptor
1969 Lamborghini Islero S, 1988 Fiero GT turbo
2009 Pontiac Solstice GXP Coupe
West Vancouver BC

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Re: B GT Suspension #15
fast-MG.com Dave Headley Cortez, 4 corners, Colorado, USA	Posted: January 26, 2012 01:39PM Registered: 4 years ago Posts: 3,209

Skookum??? confused smiley

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Re: B GT Suspension #16
bills Bill Spohn W. Vancouver, BC, Canada 1956 MG MGA 1958 MG MGA Twin-Cam 1962 MG MGA MkII Coupe 1965 Jensen CV8 1969 Lamborghini Countach → more	Posted: January 26, 2012 01:56PM Registered: 8 years ago Posts: 9,135

In reply to # 1967173 by fast-MG.com Skookum??? confused smiley

Sorry, used local term without thinking.

SKOOKUM

Bill Spohn www.rhodo.citymax.com/carstuff.html
1958 MGA Twincam (race car), 1962 MGA Deluxe Coupe
1969 MGC roadster, 1957 Jamaican MGA
1965 Jensen CV8, 1971 Jensen Interceptor
1969 Lamborghini Islero S, 1988 Fiero GT turbo
2009 Pontiac Solstice GXP Coupe
West Vancouver BC

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Re: B GT Suspension #17
chormy Shaun Holmes Norwich, Norfolk, United Kingdom 1963 MG MGB MkI "3330 PE" 1968 MG MGC "Crosby" 1969 MG MGC GTS "Yippee" 2005 Land Rover Range Rover	Posted: January 26, 2012 02:58PM Registered: 5 years ago Posts: 877

Maaybe I should go buy another shell, LS3 and join the thunder sports guys.

Awesome job Tom, hurry up Snetterton 26h feb has a few places left !!

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Re: B GT Suspension #18
Speedracer Hap Waldrop Greenville, SC, USA 1967 MG MGB "The Biscuit"	Posted: January 26, 2012 03:31PM Registered: 7 years ago Posts: 20,301

In reply to # 1966916 by fast-MG.com Hap, I learned the hard way that attaching the rear of the A-frame through the banjo drain plug will quickly lead to housing cracks. The way this is done is to bridge the side loads out to the tubes via the structure you see here. smileys with beer

Yep, thats probably a good idea, both the wishbone Spridget I worked with, actually now that I think of it, one of the Spridgets was not wishbone, the Huffaker Bugeye used a horitzontal watts link and that was it pivot attachment point, both had large, thick steel bungs welded into the diff housing in that location, and the Huffaker car had some bracing added to the rear housing as well.

Hap Waldrop
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Re: B GT Suspension #19
TomBrooksuk Tom Brooks Leicester, Leicestershire, United Kingdom 1967 MG MGB GT	Posted: January 27, 2012 03:39AM Registered: 2 years ago Posts: 591

Thanks everyone for the positive comments

Without the help an advice from so many people on this forum the car would be nothing like it is today so thanks again

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Re: B GT Suspension #20
Speedracer Hap Waldrop Greenville, SC, USA 1967 MG MGB "The Biscuit"	Posted: January 28, 2012 06:27AM Registered: 7 years ago Posts: 20,301

In reply to # 1967785 by TomBrooksuk Thanks everyone for the positive comments

Without the help an advice from so many people on this forum the car would be nothing like it is today so thanks again

Thanks for sharing your progress with us, keep it coming Tom thumbs up

Hap Waldrop
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