Click here to return to the home page.
Image of a road.
Who's Online Now
3 members (bilibib, Saxonian, Mauli), 287 guests, and 41 robots.
Key: Admin, Global Mod, Mod
Top Posters(30 Days)
+8Rich 66
Adam12 62
John V6 59
Newest Members
Chris Ontario, NickMog, YellowM, Dufty, Anted4
9,215 Registered Users
Newest Topics
New
by Rex_tulips - 30/07/25 07:59 PM
For saleWood rim moto-lita
by hugo - 30/07/25 04:28 PM
For Sale 2015 M3W - £23,000
by MOG42 - 29/07/25 06:28 PM
AC Cobra Rep. Vs Plus 8
by Richardllll - 29/07/25 04:40 PM
Me Again
by Whizjet - 29/07/25 03:13 PM
Tyre dates on Yokohama tyres
by SteveMerch - 29/07/25 12:39 PM
Aero 8 Maintenance
by mph - 29/07/25 09:24 AM
Latest Photos
Moto-lita for sale
Moto-lita for sale
by hugo, July 30
2015 M3W for sale
2015 M3W for sale
by MOG42, July 29
Motorworld München
Motorworld München
by Oskar, July 20
visit to Classic Remise Düsseldorf
my book
my book
by Oskar, July 20
Forum Statistics
Forums34
Topics48,365
Posts813,357
Members9,215
Most Online1,046
Aug 24th, 2023
Today's Birthdays
Rbt Aero8, Salmon, stevends
Previous Thread
Next Thread
Print Thread
Page 5 of 11 1 2 3 4 5 6 7 10 11
Joined: Feb 2016
Posts: 7,943
Likes: 218
Talk Morgan Guru
Offline
Talk Morgan Guru
Joined: Feb 2016
Posts: 7,943
Likes: 218
Originally Posted by CooperMan
Originally Posted by Rog
Originally Posted by PaulJ
I don't suppose anyone has had a go at fitting Rogers bump stops to an ARP4, with coilovers instead of leaf springs, have they? When loaded my springs do bottom out, with quite a bang too. The alternative is harder rear springs, but that will harshen the ride too or get some longer springs and wind up the clearance a bit.

Unfortunately these bumps stops need a damper hoop to attach to and I’m fairly certain the 5 link cars don’t have them.


PaulJ, I have a 5 link Roadster and have swopped the OE coilovers for some designed by SSL (Suplex) you get 2 springs of different rates, adjustable spring preload & adjustable shocks, worth speaking to them

The SSL coilovers Jon describes work in a counter-intuitive (to me) manner.

[Linked Image]

The two springs top long, shorter slightly stiffer lower operate in series to mutually dilute overall spring rate. This gives a softer ride for the first approx 25mm of compression travel from static. Further compression causes lower spring to become coil bound despite its standalone higher rate. This leaves upper spring only in play and an instant rise in overall rate to limit roll, as no series rate dilution.

The factory OE answer to limit roll was to use a single high rate spring which worked, but left a harsh ride. The SSL solution answers both these issues with softer more compliant ride stiffening quickly to limit roll to an even greater degree than OE, and instantly noticeable on first corner after fitting smile


Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
Joined: Oct 2011
Posts: 3,514
Likes: 8
P
Talk Morgan Addict
Offline
Talk Morgan Addict
P
Joined: Oct 2011
Posts: 3,514
Likes: 8
Firstly, Roger thanks for moving my question here, I'd overlooked the fact that I was in the For Sale section.

With regard to not having a hoop or leaf springs, yes I understand that Rogers assisters won't work as designed, however, I didn't know if with some modifications and using other parts of the rear axle/body set up they might work. I already have the SSL rear spring setup with the double springs which generally work well, but not with two up and a case on the back. They also seem a little short as I have them wound up to the top to give as much movement as possible. Maybe another inch or two would work better, (as the Bishop said to the actress), which is why I wondered if Rogers assisters would work as better bump stops than the chassis does, but with a slightly different type of fitment than the current design?

As. a matter of interest, does anyone know the spring rates of the two springs supplied by SSL?


Paul
[At last, I have a car I can polish]
Joined: Nov 2015
Posts: 7,910
Likes: 242
Just barreling along
Talk Morgan Guru
Offline
Just barreling along
Talk Morgan Guru
Joined: Nov 2015
Posts: 7,910
Likes: 242
Paul, If you have the SSL upgrade then in effect you have bumpstops, they are the white coloured rubber inside the top spring as shown on Richard's photo above


Jon M
Joined: Feb 2016
Posts: 7,943
Likes: 218
Talk Morgan Guru
Offline
Talk Morgan Guru
Joined: Feb 2016
Posts: 7,943
Likes: 218
Originally Posted by PaulJ
Firstly, Roger thanks for moving my question here, I'd overlooked the fact that I was in the For Sale section.

With regard to not having a hoop or leaf springs, yes I understand that Rogers assisters won't work as designed, however, I didn't know if with some modifications and using other parts of the rear axle/body set up they might work. I already have the SSL rear spring setup with the double springs which generally work well, but not with two up and a case on the back. They also seem a little short as I have them wound up to the top to give as much movement as possible. Maybe another inch or two would work better, (as the Bishop said to the actress), which is why I wondered if Rogers assisters would work as better bump stops than the chassis does, but with a slightly different type of fitment than the current design?

As. a matter of interest, does anyone know the spring rates of the two springs supplied by SSL?

Sorry don't know the rates Paul, but Dan at SSL would be able to tell you.

My thought's given the explanation above which came straight from Dan, are that too much pre-load would bring the lower spring closer to being coil bound so you would have less travel from static before the higher rate kicked in, defeating their object to some degree.

The prototype pair on my Roadster have the pre-load shown in image above as pre-set by Dan. Whilst I have played with damping I'm satisfied with pre-load as is, even two up, full tank and with humungous case on the back courtesy of swmbo


Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
Joined: Oct 2011
Posts: 3,514
Likes: 8
P
Talk Morgan Addict
Offline
Talk Morgan Addict
P
Joined: Oct 2011
Posts: 3,514
Likes: 8
Jon, not the full SSL upgrade, just their dual springs as described by Richard. I'm still using the standard Spax dampers which I don't think have those rubber bump stops, although it is a couple of years now, since I changed the springs. I must revisit this ongoing project again some time and remind myself just what I have. Hence my questions before I get down to it.


Paul
[At last, I have a car I can polish]
Joined: Jul 2011
Posts: 1,179
Likes: 17
Has a lot to Say!
Offline
Has a lot to Say!
Joined: Jul 2011
Posts: 1,179
Likes: 17
Whilst looking for something else I came across This which does not reflect my understanding of Roger’s Bump Stops. The way I understand them is that they are not to compensate for sagging springs but purely to prevent the springs “banging” against the frame. I believe some have cut the frame away a bit where the springs tend to contact, but that looked quite a difficult job to me. I am very pleased with Roger’s stops. They do the job they were designed for.


4/4 Ivory 4.1:1 axle, Mercedes A200 AMG
Joined: Dec 2008
Posts: 21,871
Likes: 168
DaveW Offline OP
Roadster Guru
Member of the Inner Circle
OP Offline
Roadster Guru
Member of the Inner Circle
Joined: Dec 2008
Posts: 21,871
Likes: 168
Sadly, GoMog has a toxic opinion of TM.

"owners are currently being advised by a British forum, not noted for mechanical expertise"

Just how it is......


DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
Joined: Jan 2021
Posts: 150
H
HJF Offline
L - Learner Plates On
Offline
L - Learner Plates On
H
Joined: Jan 2021
Posts: 150
I have one of the last 4/4s. My rear driver side spring has sagged a little compared with the passenger side. Not much, not enough to justify a change that could in truth just sag again. I have decided just to keep an eye on it. I did spot contact marks with the rear inner wheel arch. Inspection shows the profile of the inner arch cutaway does not ideally match the location of the axle to prevent contact free travel on compression. I have remodelled the inner arches with a pad saw. I have also fitted Rogers’s bumps which seemed a logical thing to do as, although it is a long time since I last had one, cars with such springing arrangements usually have a rubber stop fitted to prevent a metal on metal collision on full upward travel if memory serves.

Joined: Dec 2008
Posts: 21,871
Likes: 168
DaveW Offline OP
Roadster Guru
Member of the Inner Circle
OP Offline
Roadster Guru
Member of the Inner Circle
Joined: Dec 2008
Posts: 21,871
Likes: 168
The truth is that Rog's units are assisters, rather than bump stops, which give a progressive resistance towards full compression, and stop the diff casing hitting the tool tray, which can happen even on new Trads.

They transformed the bump feel on my Roadster, even with its six leaf agricultural spec springs, which are still cambered as they were when new.


DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
Joined: Jul 2007
Posts: 26,761
Likes: 425
Member of the Inner Circle
Offline
Member of the Inner Circle
Joined: Jul 2007
Posts: 26,761
Likes: 425
Dave,
I think they work well with older spings. Belle at the moment seems fine but I suspect I will be investing at a later date in some.
John


JohnV6
2022 CX Plus Four
2025 MG ZS EV aka Trigger
Page 5 of 11 1 2 3 4 5 6 7 10 11

Moderated by  TalkMorgan 

Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5