Just parked on weighbridge, who said multivans are light!

Syncro 4&4 Discussion and Q&A last answered over 2 years ago.
You may also want to visit the Wiki(pedia) for a more structured index of T25 repair, maintenance, technical and ownership topics (browse for Syncro links)

You can find further syncro specific information on the Syncronauts website.

Moderators: User administrators, Moderators

silverbullet
Trader
Posts: 16311
Joined: 08 Jun 2009, 09:51
80-90 Mem No: 6908
Location: Surrey Syncronaut #156
Contact:

Re: Just parked on weighbridge, who said multivans are light!

Post by silverbullet »

OK, will have a go in a quiet moment (I can clamp a bar to a machine table and use a bit of PTFE as a bearing, nice an slippery)

We currently a Jaguar SS100 gearbox to finish tomorrow for a German chap (who has Turns 8 & 9 of the Nordschleife named after him) that is rather urgent...

User avatar
syncropaddy
Registered user
Posts: 887
Joined: 17 Oct 2005, 22:46
80-90 Mem No: 1019
Location: Gorey, Co. Wexford, Ireland

Re: Just parked on weighbridge, who said multivans are light!

Post by syncropaddy »

Just got around to weighing some wheels ...

Image

The MB W126 7x15 ET25 steel wheel on the right weighs 9 kgs and the Ronal 7x15 ET33 on the left weighs 7.4 kgs. According to Busschmiede the Mefro 6x15 weighs 11 kgs
syncropaddy


One Syncro, five Mercedes Benzs and a rocket ship

v-lux
Trader
Posts: 737
Joined: 07 Aug 2006, 18:54
80-90 Mem No: 2951
Location: Somerset....yarp!
Contact:

Re: Just parked on weighbridge, who said multivans are light!

Post by v-lux »

Whilst i was up at Aidans recently we realised there was quite a range of wheel/tyre combinations available so took the opportunity to measure and weigh them.

In diameter size order from smallest to largest they are:

185 R14C on an original steel - 635mm
205 R14C on an Alloy - 680mm
215/75/R15 on a Mefro steel - 720mm
235/85/R16 on a Mercedes ML Alloy - 800mm

And now the weight measurements:


185 R14C on an original steel - 20kg
205 R14C on an Alloy - 20kg
215/75/R15 on a Mefro steel - 27.5kg
235/85/R16 on a Mercedes ML Alloy - 30.5kg

Image
Image
Image

And here's a shot just to compare the two Mud Terrains next to each other:
Image

User avatar
syncropaddy
Registered user
Posts: 887
Joined: 17 Oct 2005, 22:46
80-90 Mem No: 1019
Location: Gorey, Co. Wexford, Ireland

Re: Just parked on weighbridge, who said multivans are light!

Post by syncropaddy »

This should be made a sticky .... well the last bit should!
syncropaddy


One Syncro, five Mercedes Benzs and a rocket ship

max and caddy
Registered user
Posts: 1931
Joined: 21 Feb 2012, 21:47
80-90 Mem No: 0
Location: lancaster uk

Re: Just parked on weighbridge, who said multivans are light!

Post by max and caddy »

That is a rather large one....

User avatar
lloydy
Registered user
Posts: 8013
Joined: 24 Nov 2009, 17:54
80-90 Mem No: 5262
Location: cheam surrey

Re: Just parked on weighbridge, who said multivans are light!

Post by lloydy »

I really want that tyre on my van, I also want to keep the 16" arches. What want will win my brain argument?.. Would it devalue a 16"?..
Time is a drug. Too much of it kills you

User avatar
syncropaddy
Registered user
Posts: 887
Joined: 17 Oct 2005, 22:46
80-90 Mem No: 1019
Location: Gorey, Co. Wexford, Ireland

Re: Just parked on weighbridge, who said multivans are light!

Post by syncropaddy »

That 16" 235/85 wheel tyre is just bonkers for a Syncro. 30% heavier than standard and 6 1/2" larger in diameter has to have a detrimental effect on brakes, shocks and everything in the transmission! Crazy.
syncropaddy


One Syncro, five Mercedes Benzs and a rocket ship

User avatar
lloydy
Registered user
Posts: 8013
Joined: 24 Nov 2009, 17:54
80-90 Mem No: 5262
Location: cheam surrey

Re: Just parked on weighbridge, who said multivans are light!

Post by lloydy »

I'll have to weigh my wheel and tyre combo, the merc rims are super light
Time is a drug. Too much of it kills you

v-lux
Trader
Posts: 737
Joined: 07 Aug 2006, 18:54
80-90 Mem No: 2951
Location: Somerset....yarp!
Contact:

Re: Just parked on weighbridge, who said multivans are light!

Post by v-lux »

That 16" 235/85 wheel tyre is just bonkers for a Syncro

Works quite nicely with a Tdi though.

User avatar
HarryMann
Admin/Mod
Posts: 9579
Joined: 30 Sep 2005, 11:40
80-90 Mem No: 379
Location: Herts, UK

Re: Just parked on weighbridge, who said multivans are light!

Post by HarryMann »

That's 50% heavier not 33% SPaddy.
The 80-90 Tech Wikipedia Your 1st port of call :idea

1.9TD Syncro Doka / Syncro Kastenwagen / 16" Kombi Camper
Syncronaut No. 1

User avatar
HarryMann
Admin/Mod
Posts: 9579
Joined: 30 Sep 2005, 11:40
80-90 Mem No: 379
Location: Herts, UK

Re: Just parked on weighbridge, who said multivans are light!

Post by HarryMann »

So the MoI is probably 2 x or 100% greater. .
The 80-90 Tech Wikipedia Your 1st port of call :idea

1.9TD Syncro Doka / Syncro Kastenwagen / 16" Kombi Camper
Syncronaut No. 1

User avatar
syncropaddy
Registered user
Posts: 887
Joined: 17 Oct 2005, 22:46
80-90 Mem No: 1019
Location: Gorey, Co. Wexford, Ireland

Re: Just parked on weighbridge, who said multivans are light!

Post by syncropaddy »

HarryMann wrote:That's 50% heavier not 33% SPaddy.

Or 30% .... !!

Its difficult at my age to see the keys without my glasses.... difficult to see most things actually!

I would also concur that the MoI is twice what it should be and even with a built in safety factor without mods to the entire drive train those big wheels are bonkers on a Syncro - TDi or not!
syncropaddy


One Syncro, five Mercedes Benzs and a rocket ship

v-lux
Trader
Posts: 737
Joined: 07 Aug 2006, 18:54
80-90 Mem No: 2951
Location: Somerset....yarp!
Contact:

Re: Just parked on weighbridge, who said multivans are light!

Post by v-lux »

Can you guys explain for everyone what you're talking about? :lol:

User avatar
syncropaddy
Registered user
Posts: 887
Joined: 17 Oct 2005, 22:46
80-90 Mem No: 1019
Location: Gorey, Co. Wexford, Ireland

Re: Just parked on weighbridge, who said multivans are light!

Post by syncropaddy »

MoI = Moment of inertia is a property of a body that defines its resistance to a change in angular velocity about an axis of rotation.

Now you know !!

If you ever wondered why you are shearing drive shafts and bursting CV joints whilst off road, now you partially know! Its to do with a change in angular velocity about an axis of rotation and if the 'body' has twice the 'property' and tries to suddenly change its angular velocity ...... crunch! There are other factors as well ...
syncropaddy


One Syncro, five Mercedes Benzs and a rocket ship

v-lux
Trader
Posts: 737
Joined: 07 Aug 2006, 18:54
80-90 Mem No: 2951
Location: Somerset....yarp!
Contact:

Re: Just parked on weighbridge, who said multivans are light!

Post by v-lux »

if the 'body' has twice the 'property' and tries to suddenly change its angular velocity ...... crunch!

Yup, that's definitely a very good description of what happened last time i sheared some drive shafts, however i think that was more to do with my rear difflock engaging suddenly whilst a wheel was spinning. Lesson learned in there, never try anything stupid unless you are positive that the difflocks are engaged already!
However, i didn't have these tyres back then. I was running a size which is very close to a standard 16" size, admittedly the 16" vans run thicker drive shafts/cv joints to compensate for the heavier wheels/tyres etc and i thought about having larger shafts made up but decided i would rather the shafts were the weak point in the system.
Much cheaper to replace one of those than a gearbox and CV's even!

Aidan was telling me the other day that it was possible to get a 16" with 7.50 16" tyres, something to do with NATO wanting to run that tyre size (makes sense). Which actually means that my current tyre size isn't very far away at all from something specced from the factory. Not even sure if the 7.50 16" would even be any lighter, given the kind of steel most of the military tyres have in them.

I definitely would like some shocks with different damping though, but it drives surprisingly well considering the shocks are built to deal with a lot less weight flying about underneath them!

Locked