SBU Rear fenders - Page 2 - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
post #11 of 18 (permalink) Old 01-29-2017, 10:48 AM Thread Starter
BenzWorld Junior Member
 
Date registered: Jan 2016
Vehicle: 2015 GLK
Posts: 39
Mentioned: 0 Post(s)
Quoted: 7 Post(s)
(Thread Starter)
Update; we found some time to finish our fender project. We bought 2 cheap poly standard semi fenders and cut them in half. Put them back together and created some brackets.

Very happy with the results! Thanks all for the great idea's and suggestions!
Attached Thumbnails
Click image for larger version

Name:	20170122_151602_resized.jpg
Views:	74
Size:	33.0 KB
ID:	2075985   Click image for larger version

Name:	20170122_151610_resized.jpg
Views:	75
Size:	49.0 KB
ID:	2075993   Click image for larger version

Name:	20170122_151619_resized.jpg
Views:	71
Size:	45.9 KB
ID:	2076001   Click image for larger version

Name:	20170122_151629_resized.jpg
Views:	71
Size:	43.5 KB
ID:	2076009  
ACAD_Cowboy likes this.
rrental is offline  
Sponsored Links
Advertisement
 
post #12 of 18 (permalink) Old 05-23-2019, 03:42 AM
BenzWorld Junior Member
 
Date registered: Jul 2015
Vehicle: 1988 U1300
Location: Halifax, Nova Scotia, Canada
Posts: 45
Mentioned: 0 Post(s)
Quoted: 5 Post(s)
Over the winter that isn't ending here in Nova Scotia (+2 C yesterday with the wind and enough rain this Spring to film the next 'Waterworld") I removed the water tank from my 1300L fire Mog and need to fit fenders to the rear. I don't have the spider frame or bed yet and don't expect those to be available for a few more months. So....I've been looking for rear fenders to affix to the frame so I can begin driving the beast after having spent many many hours tidying up small things that needed attention.

Following suggestions offered on this most helpful site, I was in contact with Poly Tech in Prince George and cannot say enough good stuff about their customer service. Their single wheel fender is not wide enough so Cal cut down the double wheel poly fender to provide me with a 16" width, and he plastic welded each so that I have an inner fender lip as well. Both were shipped clear across the country (3500 miles) for $146 Cdn. These things are stout. When I cut out the back I left about 7" of material to mimick an inner fender. If this proves to be a problem with rubbing or mud accumulation I'll cut them out.

I am appreciative of suggestions on how much space to leave between the bottom of the fender and the top of the tire. I have no weight on the rear right now so expect the springs to compress somewhat when a bed is added. A few photos are included that depict approximately 7 3/4 inches for the stock fronts, but that looks like too much for the rear, so I'm looking at 6". Most of the photos I'm looking at have less space in the back than the front. At 6" I have approx. 1 3/4 inches from the top of the fender to the top of the rear shock mount. Any suggestions?

I also have to fab the fender brackets from scratch. I'm not finding many examples of the configuration of fender brackets mounted directly to the frame and see that a few of you have fabbed these up. If anybody want to shamelessly self promote your creative skills, or post somebody else's, these will be helpful as I decide how to bridge that gap between the frame and the fender mount.....C channel, square tubing, round tubing... I have a mig but no metal bending equipment.

Cheers!
Attached Thumbnails
Click image for larger version

Name:	fendersarrive.jpg
Views:	18
Size:	90.1 KB
ID:	2514980   Click image for larger version

Name:	baresideleft.jpg
Views:	16
Size:	85.5 KB
ID:	2514982   Click image for larger version

Name:	fenderflatontireleft.jpg
Views:	19
Size:	105.2 KB
ID:	2514984   Click image for larger version

Name:	fenderinpositionleft.jpg
Views:	19
Size:	104.7 KB
ID:	2514986   Click image for larger version

Name:	fenderinpositionleft1.jpg
Views:	20
Size:	95.6 KB
ID:	2514988  

Click image for larger version

Name:	spacingtiretowheellipleftfront.jpg
Views:	17
Size:	81.5 KB
ID:	2514990   Click image for larger version

Name:	spacingtiretowheellipleftrear.jpg
Views:	18
Size:	70.0 KB
ID:	2514992  
Daytonacoupe66 is offline  
post #13 of 18 (permalink) Old 05-23-2019, 07:36 PM
BenzWorld Member
 
Date registered: Aug 2016
Vehicle: 1988 U1300L RW1 Working gears Mogauspuf Dual Tanks Other Goodies 91 F250 HD 4x4
Location: Front Range CO
Posts: 117
Mentioned: 0 Post(s)
Quoted: 18 Post(s)
Quote:
Originally Posted by Daytonacoupe66 View Post
I am appreciative of suggestions on how much space to leave between the bottom of the fender and the top of the tire. I have no weight on the rear right now so expect the springs to compress somewhat when a bed is added. A few photos are included that depict approximately 7 3/4 inches for the stock fronts, but that looks like too much for the rear, so I'm looking at 6". Most of the photos I'm looking at have less space in the back than the front. At 6" I have approx. 1 3/4 inches from the top of the fender to the top of the rear shock mount. Any suggestions?

I also have to fab the fender brackets from scratch. I'm not finding many examples of the configuration of fender brackets mounted directly to the frame and see that a few of you have fabbed these up.
Cheers!
Never one to tell someone what to do, but usually willing to throw out some observations, so here goes. I think the dearth of frame-attached rear fenders is likely due to the huge suspension travel of the Mog, and the fact that any bed/ body has travel of its own, i.e. the potential is for the total travel above/ below the fender to be very large.

By way of starting point, I did some measures on my RW1, 7450 kg GVW. Sitting static in the shop, with partial tanks in a gutted/ rebuilt "camping" firebody (itself a Wackenhut original), I'd guesstimate the weight at 13,500-14,000 lbs, with a fair amount over the rear wheels. Tires are Conti 365/ R80 MPT's, with little wear. Firebody floor is 1/8" +/- (transmogrified when transshipped from a metric universe) aluminum.

Top of shock tower to bottom of floor plate 1 1/4"
Top of tire to bottom of floor plate 8 1/2"
Top of frame rail (at rear, level section) to bottom of floor plate 9 1/4"

Track width approx 90"
Width of rebound bump stop limit bumpers 34"
Static clearance/ travel room below rebound limiters 3 3/4"

The width ratio between limiters and track suggests a multiplier of about 2.6, which suggests that there resultant travel at the outer edge of the tire could be almost 10 inches. That would undoubtedly announce itself quite vociferously, so I am inclined to think there is a modifier at work, namely that the axle as a whole will move away from the body, as regulated by the pivot points of the Panhard rod, so as to achieve a balance of total upward force from the TWO springs as measured against the axle loaded weight. Long way of saying, the 8 1/2" clearly (so to speak) works, but good reason not to reduce that.

On to the frame flex/ body torsion side of the equation. The twist deflection limiter studs on the rear subframe crossmember are 16" outboard of the center of the truck frame, which is coincident with the pivot point of the subframe (what a surprise-super symmetry). One half of the track is 45", so there is a travel distance multiplier of 2.8. Measuring 1 7/8" of clearance at the frame bump stops/ studs suggest a theoretical possible downward travel of the firebody at the outer edge of the wheel of 5 1/4".

Lacking the ambition to pull out of the shop and find a large rock to surmount (the truck, not me), I have to mentally model the combination of spring compression and torsional twist in the firebody. I confess, the only thing I can definitively state is that I have wound the truck up a reasonable amount (but not to an extreme) and haven't scraped or bound up anything. What I am fairly confident of is that the suspension travel allowances on my truck are not to be reduced, and any fender on a similar Mog probably needs to respect those kind of clearances. It may be that , at least in some circumstances, the body will twist upward as the corresponding wheel rebounds upward; diverging rather than converging.

Another method of analysis is to look at the Atlas catalog, specifically their subframe and the fender liners they fabricate for use with. I have the Atlas subframe as a kit, but not yet assembled (time and money, natch). Michael Dennig told me the top of their subframe would be 75 mm lower than "standard", which is the amount they need the wheel well to intrude upward above the top of the subframe, to allow for wheel/ suspension travel. Their fender liners use all of that upside clearance, and are a subframe mount, NOT a frame mount.

A suggestion: do a real simple frame-fixed crossbar(s) mount for the new poly fenders, that will allow you to drive around now, and then do a snazzy subframe/ bed/ body mount when that becomes a reality.
photobldr is offline  
Sponsored Links
Advertisement
 
post #14 of 18 (permalink) Old 05-24-2019, 06:42 AM
BenzWorld Junior Member
 
Date registered: Jul 2015
Vehicle: 1988 U1300
Location: Halifax, Nova Scotia, Canada
Posts: 45
Mentioned: 0 Post(s)
Quoted: 5 Post(s)
Photobldr; many thanks for the thoughtful analysis and the measures. I will go with your suggestion ": do a real simple frame-fixed crossbar(s) mount for the new poly fenders, that will allow you to drive around now, and then do a snazzy subframe/ bed/ body mount when that becomes a reality". Making changes can tax the grey matter when fabrication experience is slim to NIL, particularly when there's no tangible example or drawings to copy. Trying to avoid outsourcing at shop rates where possible. Cheers.
Daytonacoupe66 is offline  
post #15 of 18 (permalink) Old 07-23-2019, 03:39 AM
BenzWorld Junior Member
 
Date registered: Jul 2015
Vehicle: 1988 U1300
Location: Halifax, Nova Scotia, Canada
Posts: 45
Mentioned: 0 Post(s)
Quoted: 5 Post(s)
Update - rear fenders on temporary mounts

A quick update on the Polytech rear fenders; temporary frame affixed mounts are welded up and installed. Now I can drive the truck (mud flaps will go on asap). The little things that needed attention (ones I could find or found me) have been remedied and the old girl has been running along well. Spider frame is next. Cheers!
Attached Thumbnails
Click image for larger version

Name:	rear fenders on2.jpg
Views:	10
Size:	92.5 KB
ID:	2529952   Click image for larger version

Name:	rear fenders on1.jpg
Views:	9
Size:	80.1 KB
ID:	2529954   Click image for larger version

Name:	rear fenders on.jpg
Views:	8
Size:	97.9 KB
ID:	2529956  
photobldr likes this.
Daytonacoupe66 is offline  
post #16 of 18 (permalink) Old 07-23-2019, 06:40 AM
BenzWorld Elite
 
TRUKTOR's Avatar
 
Date registered: May 2006
Vehicle: U1450L DOKA
Location: BOZEMAN, MONTANA
Posts: 9,469
Mentioned: 3 Post(s)
Quoted: 153 Post(s)
That is looking good.

A little late to the party, but here is one shot of something that Mercedes uses to put fenders on trucks, UNIMOGs or otherwise, that need to be driven for delivery, etc., but do not have rear beds or bodies installed.

The fenders have a series of pockets moulded into the fender, which stair-step up the outside of the fender. By grabbing lengths of wood (about 2" X 3" ) and picking the appropriate pockets, they can quickly hang legal fenders on a variety of trucks. The examples I saw at Wörth used plastic strapping to secure the wood to the frame rails, and torx drive wood screws to anchor the fenders to the lumber.

I know I have more photos of these things, but I can't find them at the moment.
Attached Thumbnails
Click image for larger version

Name:	Screen Shot 2019-04-02 at 2.24.15 AM.png
Views:	11
Size:	752.2 KB
ID:	2529968  

Last edited by TRUKTOR; 07-23-2019 at 06:42 AM.
TRUKTOR is offline  
post #17 of 18 (permalink) Old 07-23-2019, 05:39 PM
BenzWorld Elite
 
ACAD_Cowboy's Avatar
 
Date registered: Oct 2009
Vehicle: 2015 Rubicon Unlimited (Let the shame be upon me!)
Location: Long Island, NY
Posts: 3,718
Mentioned: 0 Post(s)
Quoted: 169 Post(s)
Send a message via AIM to ACAD_Cowboy
Smart if not a little hokey but not in a bad way. Wonder if those fenders are in the film, should be easy enough to get metric metal to match.

Nominal Actual Actual - Metric
1" x 2" 3/4" x 1-1/2" 19 x 38 mm
1" x 3" 3/4" x 2-1/2" 19 x 64 mm
1" x 4" 3/4" x 3-1/2" 19 x 89 mm
1" x 5" 3/4" x 4-1/2" 19 x 114 mm
1" x 6" 3/4" x 5-1/2" 19 x 140 mm
1" x 7" 3/4" x 6-1/4" 19 x 159 mm
1" x 8" 3/4" x 7-1/4" 19 x 184 mm
1" x 10" 3/4" x 9-1/4" 19 x 235 mm
1" x 12" 3/4" x 11-1/4" 19 x 286 mm
1-1/4" x 4" 1" x 3-1/2" 25 x 89 mm
1-1/4" x 6" 1" x 5-1/2" 25 x 140 mm
1-1/4" x 8" 1" x 7-1/4" 25 x 184 mm
1-1/4" x 10" 1" x 9-1/4" 25 x 235 mm
1-1/4" x 12" 1" x 11-1/4" 25 x 286 mm
1-1/2" x 4" 1-1/4" x 3-1/2" 32 x 89 mm
1-1/2" x 6" 1-1/4" x 5-1/2" 32 x 140 mm
1-1/2" x 8" 1-1/4" x 7-1/4" 32 x 184 mm
1-1/2" x 10" 1-1/4" x 9-1/4" 32 x 235 mm
1-1/2" x 12" 1-1/4" x 11-1/4"32 x 286 mm
2" x 2" 1-1/2" x 1-1/2" 38 x 38 mm
2" x 4" 1-1/2" x 3-1/2" 38 x 89 mm
2" x 6" 1-1/2" x 5-1/2" 38 x 140 mm
2" x 8" 1-1/2" x 7-1/4" 38 x 184 mm
2" x 10" 1-1/2" x 9-1/4" 38 x 235 mm
2" x 12" 1-1/2" x 11-1/4"38 x 286 mm
3" x 6" 2-1/2" x 5-1/2" 64 x 140 mm
4" x 4" 3-1/2" x 3-1/2" 89 x 89 mm
4" x 6" 3-1/2" x 5-1/2" 89 x 140 mm
ACAD_Cowboy is offline  
post #18 of 18 (permalink) Old 07-23-2019, 09:00 PM
BenzWorld Member
 
Date registered: Aug 2016
Vehicle: 1988 U1300L RW1 Working gears Mogauspuf Dual Tanks Other Goodies 91 F250 HD 4x4
Location: Front Range CO
Posts: 117
Mentioned: 0 Post(s)
Quoted: 18 Post(s)
Being in possession of various forms of cellulose re-sizing technology, I just stock Universal Wood Product, and cut to fit any particular application. Inventory consolidation, streamlined logistics.
photobldr is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Vans/Trucks/SUV/Others > Unimog

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 2 (0 members and 2 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 

Title goes here

close
video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome