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Re: M3W Chassis crack [Re: LightSpeed] #719121
24/09/21 10:56 AM
24/09/21 10:56 AM
Joined: May 2019
Posts: 499
Hampshire, UK
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Hampshire, UK
Originally Posted by LightSpeed
Originally Posted by OZ 4/4
Originally Posted by Chad Wilson
I have a 2015 with chassis cracks on both sides now

And we thought these problems stopped at the 2014 model....


It would be interesting to know how many of the cracked ones are using the factory stanard shocks.


What? I think I missed something. What’s the science behind replacing the shocks to better protect the chassis? I always thought you guys got fancy new shocks just to tear up the tarmac.


M3W Brooklands (2015)
Moody 41 (2013)
Re: M3W Chassis crack [Re: Taffmog] #719124
24/09/21 11:43 AM
24/09/21 11:43 AM
Joined: Feb 2019
Posts: 3,708
Port Orchard, WA.
LightSpeed Offline
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Port Orchard, WA.
If something rides smoother it stands to reason that the less jarring the longer the frame might last and fewer rattles and things falling off while traveling down the road.


The light at the end of the tunnel is actually a train. 2019 M3W

Re: M3W Chassis crack [Re: IMHO] #719126
24/09/21 11:48 AM
24/09/21 11:48 AM
Joined: Aug 2013
Posts: 117
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Tony Quinn Offline
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The theory I have heard is that the original Spax non-adjustable shock absorbers do not rebound quickly enough after the car hits a bump. When the car hits a number of bumps close together, the rebound to standard ride height gets less and less. In certain circumstances, say hitting even more bumps one after another, the damper rod bottoms and all the shock loading is transferred to the chassis.


Tony

Re: M3W Chassis crack [Re: Taffmog] #719149
24/09/21 02:59 PM
24/09/21 02:59 PM
Joined: May 2019
Posts: 499
Hampshire, UK
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thanks for the clarification, so has everyone thats fitted adjustable shocks set them on less rebound damping than the originals? How do you know it’s working?
Sorry for the dumb questions but I’m no suspension expert.


M3W Brooklands (2015)
Moody 41 (2013)
Re: M3W Chassis crack [Re: Tony Quinn] #719154
24/09/21 03:27 PM
24/09/21 03:27 PM
Joined: May 2015
Posts: 1,542
Oxon
PaulV Offline
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Oxon
Originally Posted by Tony Quinn
The theory I have heard is that the original Spax non-adjustable shock absorbers do not rebound quickly enough after the car hits a bump. When the car hits a number of bumps close together, the rebound to standard ride height gets less and less. In certain circumstances, say hitting even more bumps one after another, the damper rod bottoms and all the shock loading is transferred to the chassis.


Tony

Hmmm... I'm no suspension expert, but I can't see how a spring would just compress more and more just because of poor rebound characteristics of a shock absorber! But I may be wrong - any examples of this behavior?


M3W5sp 2015, MSCC, MTWC, Oxon UK
Re: M3W Chassis crack [Re: Taffmog] #719177
24/09/21 07:18 PM
24/09/21 07:18 PM
Joined: Apr 2013
Posts: 1,301
Southern Vermont
Michael H Offline
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Joined: Apr 2013
Posts: 1,301
Southern Vermont
As for the chassis cracks my main theory was that it was the starting torque generated by the engine going from zero to 100ft/lb of torque at the start. I watched the start from the outside while testing something and was absolutely appalled at the amount of movement that the engine was going through as it was trying to leave the building. The added brace was a nice thought but it just couldn't stop those forces from cracking the chassis where it did. I would expect chassis cracks all over due to driving stresses but most of the faults have been where the motor mounts are placed which would lend some credence to my crazy idea.

It's an opinion.


What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.
Re: M3W Chassis crack [Re: Taffmog] #719178
24/09/21 07:18 PM
24/09/21 07:18 PM
Joined: Dec 2020
Posts: 212
Ann Arbor
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Ann Arbor
do we know for a fact that the 2014 chassis steel or manufacturing process is different? thicker or different (percentage of carbon say) from the 2012-2013? Or is it simply a new front K welded into the same old chassis?


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Re: M3W Chassis crack [Re: craig from mich] #719182
24/09/21 07:36 PM
24/09/21 07:36 PM
Joined: Nov 2011
Posts: 6,156
Australia - NSW North Coast
OZ 4/4 Offline
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Posts: 6,156
Australia - NSW North Coast
Originally Posted by craig from mich
do we know for a fact that the 2014 chassis steel or manufacturing process is different? thicker or different (percentage of carbon say) from the 2012-2013? Or is it simply a new front K welded into the same old chassis?

Ask Morgan for written clarification......


A Morgan Identified Fastidious Owner...
2011 4/4 Bespoke, 1981 Delorean, Auburn Boat Tail
Re: M3W Chassis crack [Re: craig from mich] #719184
24/09/21 07:45 PM
24/09/21 07:45 PM
Joined: May 2011
Posts: 1,489
Near Windsor Berkshire
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Rog G Online content
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Joined: May 2011
Posts: 1,489
Near Windsor Berkshire
Originally Posted by craig from mich
do we know for a fact that the 2014 chassis steel or manufacturing process is different? thicker or different (percentage of carbon say) from the 2012-2013? Or is it simply a new front K welded into the same old chassis?

The chassis were originally S235 steel tube 2 mm wall thickness, changed in 2014 to ERW S355 steel tube 2.03mm wall.


2021 M3W
2013 M3W - Sold
1971 4/4 2 Seater
1934 Sports
Re: M3W Chassis crack [Re: Taffmog] #719187
24/09/21 08:00 PM
24/09/21 08:00 PM
Joined: Dec 2020
Posts: 212
Ann Arbor
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Last edited by craig from mich; 24/09/21 08:06 PM.

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