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#551335 - 02/01/19 11:22 AM Re: Traditional +8 Tyre recommendations [Re: Stephen888]
MOG 615 Offline
Has a lot to Say!

Registered: 24/09/14
Posts: 1314
Loc: London
Originally Posted By Stephen888
I run Toyo Proxes on my 1980 +8, but 205-60 on 15 inch rims. I like them and have proved fine in wet and dry. Have done 28k miles on them in last 4 years and there is still another 5k miles in them. Ran Yokos before, but when I switched to Toyo in 2015 there was nothing on offer.


Stephen

Is that the Proxes CF2 , rather than the T1 R ? I think the latter is not available in 205/60 x 15 .
_________________________
Andy G
1999 +8 , Indigo Blue.
Ex-John McKecknie/Mike Duncan 1955 +4 racer.

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#551336 - 02/01/19 11:27 AM Re: Traditional +8 Tyre recommendations [Re: Calypso Red]
MOG 615 Offline
Has a lot to Say!

Registered: 24/09/14
Posts: 1314
Loc: London
Originally Posted By Calypso Red
Hi BritMog, my 1994 +8, on alloys, came out of the factory with Pirelli 205/60R15 91V. I later changed to Yokohamas of the same size and I would agree, they have been good. However, some where along the way my +8 has developed the 'Nodding Dog Syndrome' with the front end bouncing continuously on the smoothest of roads. I have not made any changes to the front suspension apart from changing to AVO shock absorbers. Adjusting them gradually through the entire range has not affected the nodding at all. I had an email conversation with a well known specialist in Morgan suspension who was of the opinion that the nodding was due to the car bouncing on the front tyres. This is something I had never thought of. I wonder if this is something Yokohamas are pron to produce if they perhaps have soft side walls. Have you, or anyone else on TM, noticed the front end nodding after switching to Yoko's?


I think that "nodding Dog" is caused by the main springs being too soft for the +8 application. Does yours have the "blue" springs , which I believe are 110/120 lbs? If so replacing them with higher rate springs (140 lbs) will help.

However as others have commented in the thread about SSL v Rutherford, sorting out the spring lengths is a bit of a lottery, and the best way to achieve this is to use the SSL kit for the front end.

I used to suffer from nodding dog quite badly , Koni front shocks helped somewhat , but it was eliminated when I fitted the SSL front end kit.
_________________________
Andy G
1999 +8 , Indigo Blue.
Ex-John McKecknie/Mike Duncan 1955 +4 racer.

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#551339 - 02/01/19 12:06 PM Re: Traditional +8 Tyre recommendations [Re: Calypso Red]
N22MOG Offline

Has a lot to Say!

Registered: 09/06/09
Posts: 1255
Loc: Edenbridge, Kent, UK
My ‘96 Plus 8 on alloys used to suffer from “nodding dog” syndrome, had the SSL front suspension mod and it disappeared, that was two years ago and on two different brands of tyre so in my case it seems it was definitely suspension rather than tyre related.
_________________________
Steve L.

1996 Plus 8

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#551346 - 02/01/19 12:41 PM Re: Traditional +8 Tyre recommendations [Re: Fuel.inj]
jbk Offline

Talk Morgan Regular

Registered: 10/02/12
Posts: 604
Loc: Essex
My 93 plus 4 (plus 8 body) will get the nodding dog at 25psi its fine at 22psi

Switching from standard shocks to Avos made no difference to this behaviour

So presumably tyre pressure has a bearing also, Tyres are Avon zv3.
_________________________
1993 T16 +4 Lancia Blue.

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#551567 - 03/01/19 06:11 PM Re: Traditional +8 Tyre recommendations [Re: MOG 615]
Calypso Red Offline
Just Getting Started

Registered: 20/08/17
Posts: 46
Loc: Staffordshire UK
Originally Posted By N22MOG
Originally Posted By MOG 615
Originally Posted By Calypso Red
Hi BritMog, my 1994 +8, on alloys, came out of the factory with Pirelli 205/60R15 91V. I later changed to Yokohamas of the same size and I would agree, they have been good. However, some where along the way my +8 has developed the 'Nodding Dog Syndrome' with the front end bouncing continuously on the smoothest of roads. I have not made any changes to the front suspension apart from changing to AVO shock absorbers. Adjusting them gradually through the entire range has not affected the nodding at all. I had an email conversation with a well known specialist in Morgan suspension who was of the opinion that the nodding was due to the car bouncing on the front tyres. This is something I had never thought of. I wonder if this is something Yokohamas are pron to produce if they perhaps have soft side walls. Have you, or anyone else on TM, noticed the front end nodding after switching to Yoko's?


I think that "nodding Dog" is caused by the main springs being too soft for the +8 application. Does yours have the "blue" springs , which I believe are 110/120 lbs? If so replacing them with higher rate springs (140 lbs) will help.

However as others have commented in the thread about SSL v Rutherford, sorting out the spring lengths is a bit of a lottery, and the best way to achieve this is to use the SSL kit for the front end.

I used to suffer from nodding dog quite badly , Koni front shocks helped somewhat , but it was eliminated when I fitted the SSL front end kit.


My ‘96 Plus 8 on alloys used to suffer from “nodding dog” syndrome, had the SSL front suspension mod and it disappeared, that was two years ago and on two different brands of tyre so in my case it seems it was definitely suspension rather than tyre related.
_________________________
Steve L.


Thanks for the info. I did look at the SSL adverts and was very tempted, but they did not mention any results in +8's. However, in view of JBK's experiance with tyres I think I will tinker with tyre pressures and my AVO's at the start of next season and if that does not help I will consider the SSL convertion seriously then. Thanks everyone,
_________________________
Calypso Red
1994 +8 BMW Calypso Red.
2002 4/4 4 seater BMW Calypso Red.

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#551601 - 03/01/19 10:22 PM Re: Traditional +8 Tyre recommendations [Re: Fuel.inj]
Calypso Red Offline
Just Getting Started

Registered: 20/08/17
Posts: 46
Loc: Staffordshire UK
Forgot to mention, yes, my main & rebound springs are "blue".
_________________________
Calypso Red
1994 +8 BMW Calypso Red.
2002 4/4 4 seater BMW Calypso Red.

Top
#551718 - 04/01/19 03:59 PM Re: Traditional +8 Tyre recommendations [Re: Fuel.inj]
Button Offline
Talk Morgan Enthusiast

Registered: 19/12/11
Posts: 1650
Loc: Seattle, USA
I am trying to remember what the situation was when I had "nodding dog" problem. I think I was using Yoko tires but I also took a leaf out of My rear springs creating a very soft rear end. Although I had driven to Northern California, it was a chore. When I returned to Seattle I replaced the rear springs with a pair of 5 leaf springs and changed to Michelin Premier tires. These are "garden variety" SUV tires sourced from COSTCO. Made In Canada. OK for Wet pavement but certainly not a Performance Tire. In the U.S. it is hard to find a suitable tire. Pick Up Trucks and SUV's and overweight Mercedes and BMW's abound.
_________________________
Button

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