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beautymate
United Kingdom
365 Posts |
 Posted - 20/07/2014 : 18:25:23
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Does any one have experience/thoughts on boxing in an MG chassis rails to gain strength/stop chassis twist. Is there a down side to doing this?
Cheers
Chris |
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bob
United Kingdom
335 Posts |
Posted - 20/07/2014 : 19:04:17
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| I think the main downside to boxing in chassis rails is it allows water to remain trapped inside leading to the enevitable rust.Obviously it also adds weight and as it is non original it could possibly devalue the car? |
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JohnE
United Kingdom
373 Posts |
Posted - 20/07/2014 : 20:30:35
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I believe the TA had a reputation for chassis cracks just aft of the boxed in part, which ran roughly from gearbox to front trunnion to stiffen up the rubber mounted engine area. Mine certainly cracked under the passenger seat, and it certainly wasn't the weight of my passenger.
JohnE |
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Tony Dolton
United Kingdom
372 Posts |
Posted - 21/07/2014 : 09:04:04
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The MMM chassis is designed to be flexible not rigid.if you mess about with it you are likely to alter the handling.the VSCC will not accept chassis 'botches' if you wish to compete in their events.if the chassis could have been improved no doubt Abingdon would have done it.
Tony |
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Colin Butchers
United Kingdom
1487 Posts |
Posted - 21/07/2014 : 11:11:41
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It was not uncommon to box in MMM chassis' before the war, to improve handling on the Brooklands Outer Circuit, where it was considered that the normal MG chassis was just too flexible and led to excessive wandering about at speed. Somewhere in my files I have a drawing of the boxing in done to the ex Ashton Rigby L2 (now owned by Malcolm Newman) and I have no knowledge as to whether this resulted in chassis cracking.
The work was done by a bloke called Robin Jackson who I am told was quite good at getting cars to go quickly at Brooklands. |
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MaGic_GV
United Kingdom
868 Posts |
Posted - 21/07/2014 : 13:24:44
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Presumably boxing in has to allow access holes for cable brake fitting etc., allowing flexing to focus on these potential weak areas?
Regards,
Graham
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Peter Scott
United Kingdom
1240 Posts |
Posted - 21/07/2014 : 13:34:58
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In 'Wheatley & Morgan' there is a comment, with reference to the stiffening of the chassis of early cars, that "The suspension is usually so stiff that it is necessary for the frame to be flexible in order to keep the wheels on the ground". No doubt applicable to Triple-M cars.
Peter |
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PeterL
United Kingdom
1723 Posts |
Posted - 21/07/2014 : 13:42:25
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I know of two F Stiles chassis that were boxed. the work was crude, apparently, on my car it certainly was. There were holes in the boxing for cross tube and access to fixings etc. My chassis had been in a fire and so determining what caused how much corrosion is difficult but the crannies and nooks would have been an ideal breeding place for rust.
Sorry cannot find a photo...
Cheers
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