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Re: Plus Six Ground Clearance [Re: NZPlusSix] #754935
08/09/22 10:54 AM
08/09/22 10:54 AM
Joined: Nov 2011
Posts: 5,981
Australia - NSW North Coast
OZ 4/4 Offline
Charter Member
OZ 4/4  Offline
Charter Member

Joined: Nov 2011
Posts: 5,981
Australia - NSW North Coast
Originally Posted by NZPlusSix
Our replacement coil over damper suspension units with adjustable spring platforms for the Plus Six arrived safely in NZ and have been fitted.

Firstly a big shout out to Dan and Peter at SSL for their professional advice and guidance, plus a heap of patience they had answering al our questions! Well done chaps.

Our Plus Six ground to wheel arch rim measurements with the new suspension units, on level ground, full tank of fuel, un-laden & 28 psi in tires. And after being driven and settled overnight.
Front Left Front Right Rear Left Rear Right
675mm 676mm 695mm 693mm.
[Linked Image]

It is such an easy way of measuring how high your car is off the ground and I would recommend all Plus Six owners with any concerns to measure their cars and compare with our car.

Also the ground clearances are now virtually the same as Williams got from Morgan before I ordered the Plus Six 135mm front; 155mm rear. That is measured on the flat surface on the chassis adjacent the wishbone attachment point (where the Morgan jacking hole is located). My P6 130mm front; 150mm rear. The minimum ground clearance under the muffler is now 105mm

Another noticeable change was that with the dropped suspension the toe-in had changed and the car tended to wander a little on straight roads. With lifted suspension the toe-in was now back to what it should have been.

I'm waiting for the brake unit replacement before I do a real road test on windy mountain roads so watch this space!

A GREAT car just made better!

[b][/b]


That's legal and will get you over most obstacles without grounding....


A Morgan Identified Fastidious Owner...
2011 4/4 Bespoke, 1981 Delorean, Auburn Boat Tail
Re: Plus Six Ground Clearance [Re: NZPlusSix] #754936
08/09/22 11:12 AM
08/09/22 11:12 AM
Joined: Jul 2016
Posts: 51
MikeFromPembroke Offline
Just Getting Started
MikeFromPembroke  Offline
Just Getting Started

Joined: Jul 2016
Posts: 51
Chassis clearance is about 130 at the reinforced jacking points - exhaust is about 20mm lower. (Bit awkward in the garage and we got rain.....)


Mike
1982 4/4
2004 Roadster S1
2010 Roadster S2
2021 Plus 6
Re: Plus Six Ground Clearance [Re: MogCX] #755811
16/09/22 07:56 PM
16/09/22 07:56 PM
Joined: Jun 2022
Posts: 48
Katikati NEW ZEALAND
NZPlusSix Offline
Just Getting Started
NZPlusSix  Offline
Just Getting Started

Joined: Jun 2022
Posts: 48
Katikati NEW ZEALAND
Given the side to side (right to left) variations in ground to wheel arch heights I’m getting from other P6 owners we could find some of it being due to hand assembly of our Plus Six especially the front wings. Also tire pressures could make a difference. We are using 28psi all round as the standard.

The 130mm measurement was that at the jack location flat plate adjacent the lower wishbone attachment point? Was this measurement at the rear? If so what was the front measurements – right and left? The ideal, should be 135mm front; 155mm rear, plus or minus 5%.

I'm presently building a table of all the measurements owners are supplying via TM.

Also a bit worrying that Plus Four owners are now reporting loss of ride height when it was thought that they had escaped this problem.

Kerry


2019 First Edition Plus Six Moonstone Blue
Prev
2017 Plus 4 Auto Ivory
2011 4/4 Grey
1939 4-4 Blue
Re: Plus Six Ground Clearance [Re: NZPlusSix] #755812
16/09/22 08:02 PM
16/09/22 08:02 PM
Joined: Nov 2011
Posts: 5,981
Australia - NSW North Coast
OZ 4/4 Offline
Charter Member
OZ 4/4  Offline
Charter Member

Joined: Nov 2011
Posts: 5,981
Australia - NSW North Coast
Originally Posted by NZPlusSix
Given the side to side (right to left) variations in ground to wheel arch heights I’m getting from other P6 owners we could find some of it being due to hand assembly of our Plus Six especially the front wings. Also tire pressures could make a difference. We are using 28psi all round as the standard.

The 130mm measurement was that at the jack location flat plate adjacent the lower wishbone attachment point? Was this measurement at the rear? If so what was the front measurements – right and left? The ideal, should be 135mm front; 155mm rear, plus or minus 5%.

I'm presently building a table of all the measurements owners are supplying via TM.

Also a bit worrying that Plus Four owners are now reporting loss of ride height when it was thought that they had escaped this problem.


Kerry


Nice work Kerry - Looking forward to the results.......


A Morgan Identified Fastidious Owner...
2011 4/4 Bespoke, 1981 Delorean, Auburn Boat Tail
Re: Plus Six Ground Clearance [Re: NZPlusSix] #755813
16/09/22 08:10 PM
16/09/22 08:10 PM
Joined: Jun 2021
Posts: 1,061
New Forest
Lordofthewings Offline
Has a lot to Say!
Lordofthewings  Offline
Has a lot to Say!

Joined: Jun 2021
Posts: 1,061
New Forest
Originally Posted by NZPlusSix
.....tyre pressures could make a difference. We are using 28psi all round as the standard.

OK now I'm confused.
CX generation cars seem to be fitted with Avon ZV7's, am I right ?
I have recently had them fitted to my S2 Roadster, and I'm running 24psi. Yet the manual for the original Roadster (roughly the same weight as the CX's I believe ??) states that the OE tyres should be 22psi.
What's right/wrong here, and (short of just stuffing a lot more air in mine to see what happens), any ideas ?


Peter
2009 3-litre Roadster "Ivor", royal ivory / green
Re: Plus Six Ground Clearance [Re: MogCX] #755823
17/09/22 05:04 AM
17/09/22 05:04 AM
Joined: Jun 2022
Posts: 48
Katikati NEW ZEALAND
NZPlusSix Offline
Just Getting Started
NZPlusSix  Offline
Just Getting Started

Joined: Jun 2022
Posts: 48
Katikati NEW ZEALAND
Peter
The Plus Six handbook list the following tires:
Standard - Cooper Avon ZZ5 in 18"
Option 1 - Cooper Avon ZZ5 in 19"
First Edition cars - Continental Sport Contact in 19"

As to tire pressures for all tires the handbook states - 28psi/193kPa

When my suspension dropped I tried ever pressure from 22 psi up to 28psi but because the toe-in was changed it did not help. Now back to 28psi with the replacement suspension and resulting correct toe-in. Result - great handling and a pleasure to drive!
Kerry


2019 First Edition Plus Six Moonstone Blue
Prev
2017 Plus 4 Auto Ivory
2011 4/4 Grey
1939 4-4 Blue
Re: Plus Six Ground Clearance [Re: NZPlusSix] #755827
17/09/22 06:40 AM
17/09/22 06:40 AM
Joined: Jun 2021
Posts: 1,061
New Forest
Lordofthewings Offline
Has a lot to Say!
Lordofthewings  Offline
Has a lot to Say!

Joined: Jun 2021
Posts: 1,061
New Forest
Thanks Kerry, and glad your car is sorted. I probably need a crash course in tyres. Horse for courses I guess. Different wheel diameters/widths and tyre profiles etc.

I asked because yesterday I had a pothole-damaged tyre replaced on my Fiat 124 Spider. The Bridgestone 205/45 on17" alloys, run at 29psi.The car is about the same weight and geometry as an MX-5, on which the recommended pressure is 30psi.

So why is it that my Roadster handbook recommends such an (apparently) low pressure ?

[Linked Image]


Peter
2009 3-litre Roadster "Ivor", royal ivory / green
Re: Plus Six Ground Clearance [Re: MogCX] #755829
17/09/22 06:54 AM
17/09/22 06:54 AM
Joined: Jun 2015
Posts: 1,298
North Somerset, UK
Deejay Offline
Has a lot to Say!
Deejay  Offline
Has a lot to Say!

Joined: Jun 2015
Posts: 1,298
North Somerset, UK
Peter, weight of the vehicle is one consideration for tyre pressure but with low profile 45s, if you ran at a lower pressure, you would be almost running on the wheel rims!


Doug

2011 +4 in Rich Maroon
1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900
Re: Plus Six Ground Clearance [Re: MogCX] #755839
17/09/22 08:09 AM
17/09/22 08:09 AM
Joined: Jul 2007
Posts: 23,217
Suffolk, England
John V6 Offline
Brooklands Register contact
John V6  Offline
Brooklands Register contact
Member of the Inner Circle

Joined: Jul 2007
Posts: 23,217
Suffolk, England
On Morgans with limited suspension travel the lower tyre pressures provide some of the suspension. If you have ever replaced old tyres on a Morgan you will be amazed at the difference.


JohnV6
2014 Brooklands Edition Roadster "Brookland's Belle" #5 of 50
Re: Plus Six Ground Clearance [Re: John V6] #755844
17/09/22 08:52 AM
17/09/22 08:52 AM
Joined: Jun 2021
Posts: 1,061
New Forest
Lordofthewings Offline
Has a lot to Say!
Lordofthewings  Offline
Has a lot to Say!

Joined: Jun 2021
Posts: 1,061
New Forest
Originally Posted by John V6
If you have ever replaced old tyres on a Morgan you will be amazed at the difference.

Quite so. My new ZV7's replaced 8-year old Toyo Proxes. A different feel altogether.


Peter
2009 3-litre Roadster "Ivor", royal ivory / green
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