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Wales
by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Aug 2013
Posts: 213
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Aug 2013
Posts: 213 |
I have a 2005 Roadster. I was wondering what the "normal from the factory" rear thrust angle measurement is for a Roadster. Is it possible to change the setting?
2005 Roadster
2013 M3W
MOG South
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Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
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DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Talk Morgan Addict
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Talk Morgan Addict
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Learner Plates Off!
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Learner Plates Off!
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Haven't heard that term before. Can you clarify?
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Joined: Jul 2011
Posts: 3,643
Talk Morgan Addict
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Talk Morgan Addict
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I thought it was only me that did not know the term.
Just looked on google, the classic Morgans have solid rear axels so would have zero
"Thrust angle"
Last edited by Wirewheel; 03/08/14 08:04 PM.
Ian
2011 Plus 4
Wild Mogs Reims 2019, Goodwood 2018, Isle of Man 2017, Carried on to Caramulo" 2016
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What a relief, I had none idea either with Thurston angles.....
Ruut Bianchi
Morgan PlusFour 2023 Bentley Midnight Emerald
Morgan 4/4 4-seater 1990 Royal Ivory
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Joined: Nov 2011
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
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Ruut Bianchi
Morgan PlusFour 2023 Bentley Midnight Emerald
Morgan 4/4 4-seater 1990 Royal Ivory
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L - Learner Plates On
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L - Learner Plates On
Joined: Aug 2013
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Definition: The angle between the thrust line and centerline. If the thrust line is to the right of the centerline, the angle is said to be positive. If the thrust line is to the left of center, the angle is negative. It is caused by rear wheel or axle misalignment and causes the steering to pull or lead to one side or the other. It is the primary cause of an off-center or crooked steering wheel. Correcting rear axle or toe alignment is necessary to eliminate the thrust angle. If that is not possible, using the thrust angle as a reference line for aligning front toe can restore center steering.
2005 Roadster
2013 M3W
MOG South
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Talk Morgan Enthusiast
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Ruut Bianchi
Morgan PlusFour 2023 Bentley Midnight Emerald
Morgan 4/4 4-seater 1990 Royal Ivory
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Joined: Dec 2008
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Roadster Guru Member of the Inner Circle
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Ah well, in an ideal world it would be zero then. But when the rear axle describes an arc (vertically) around the front spring mounts, a different ride height side to side will vary the angle slightly due to variance of the length of the 'trailing arms'. This is evidenced when new rear springs are fitted, and invariably the steering wheel 'straight ahead' position will change very slightly. Not that this is much help!
DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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