Cosworth 3 door with a 4x4 rear anti roll bar
#1
Cosworth 3 door with a 4x4 rear anti roll bar
Hello
Can any one show me some pictures of a 3 door Cosworth with a 4x4 saf rear beam set up need to see how the rear anti roll fits I am trying to fit the 4x4 18mm thick roll bar and I don't no what drop links to use
Thanks for your help
Can any one show me some pictures of a 3 door Cosworth with a 4x4 saf rear beam set up need to see how the rear anti roll fits I am trying to fit the 4x4 18mm thick roll bar and I don't no what drop links to use
Thanks for your help
#2
PassionFord Regular
To fit a saph, escort or granada of arb to a 3 door, You have to weld mounting blocks to the chassis member at the rear to mount the arb brackets and you use the saph drop links and weld mounts to your rear arms to suit to fit it on a 3 door, really easy job to be fair, I fitted a 21mm granada one to my 3 door (rep) project
Pictures speak a thousand words
This is what I made to mount the arb bracket on, i made them from one piece of steel cut then bent and the corners welded together, then cut the flanges off, cut a slot in for the arb bracket then drilled a hole and weld a captive nut inside
This is the location of the arb bracket mounting blocks, this is before I painted everything up
This is the bracket I made to weld to the arm to mount the drop link
You can make out the location of the brackets to bolt the drop links to on this picture
If your using sapphire arms with arb mounts ignore the last part
Pictures speak a thousand words
This is what I made to mount the arb bracket on, i made them from one piece of steel cut then bent and the corners welded together, then cut the flanges off, cut a slot in for the arb bracket then drilled a hole and weld a captive nut inside
This is the location of the arb bracket mounting blocks, this is before I painted everything up
This is the bracket I made to weld to the arm to mount the drop link
You can make out the location of the brackets to bolt the drop links to on this picture
If your using sapphire arms with arb mounts ignore the last part
Last edited by steppy; 25-01-2016 at 03:21 PM.
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2wdsaph ben (14-02-2016)
#5
Too many posts.. I need a life!!
Hi this thread is just what I was looking for, as I have a mk2 xr4x4 rear beam I am putting on a mk1 xr4i. Can you remember the size of the boxes you made up. Do they have to be a certain depth so arb sits on the right height. Also could I bolt the boxes to the car instead of welding. Thanks
#6
PassionFord Regular
Hi this thread is just what I was looking for, as I have a mk2 xr4x4 rear beam I am putting on a mk1 xr4i. Can you remember the size of the boxes you made up. Do they have to be a certain depth so arb sits on the right height. Also could I bolt the boxes to the car instead of welding. Thanks
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Mad_Mat (24-04-2022)
#7
Too many posts.. I need a life!!
That would be great if you could measure them, was going to buy a 3dr roll bar as its thicker than my 10mm xr4i one and weld tabs onto my mk2 arms but think I should just fit a mk2 arb as they should be better still than a 3dr one
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#8
PassionFord Regular
The xr4x4's arb is 14mm the same diameter as the 3 door cosworth iirc, doing it this way opens up the options if you want to go thicker the 2wd saph cosworth is 16mm, 4wd is 18mm, granada cosworth is 21mm and Escort cosworth is 22mm
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2wdsaph ben (16-02-2016)
#10
This was a usefull thread, i have just bought a 22mm escort cosworth roll bar as i bought a 6 degree beam and it came with inner arb mounts so thought it was worth while upgrading the arb, im making the drop boxes this week and welding them too the car at the weekend..
#11
PassionFord Post Troll
Old thread but does anybody know the benifit of a 4x4 rear arb over a std 3dr?
Cheers
Cheers
#12
New Owner
Yes. Working from memory differences are as follows.
Std 3dr roll bar is 14mm and mounts across the outside edges of trailing arms
2wd saph is 16mm - mounts on inner of trailing arms. Less width has got to be good for reduced flex etc thus better resisting roll.
4wd saph is 18mm i believe approx 1.5 times stiffer than 3dr 14mm
escos is 22mm and i believe 3/3.5 times stiffer than 3dr.
to my mind running with an arb allows lower springs rates softer damping. So you could for instance have it fairly soft at the back for good squat and launch but still have good roll resistance in the bends.
Some say running with no arb is fine.
personally i prefer a rear arb. I run the std 3dr one on my car. Thats with gaz golds and adjustable 6 degree rear beam. Seems to handle well to me.
I am a internet keyboard warrior and no expert. Dont flame me just my opinion.
in other news your old 200 mountune block is absolutely tip top and loving life in my 3dr. Goes well for a mild 360 i tell thee.
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smiley (23-04-2022)
#13
New Owner
Some people in old discussion threads have suggested that the 22mm arb is to stiff in a 2wd car. How did you find it?
#14
PassionFord Post Troll
Hi mate,
Yes. Working from memory differences are as follows.
Std 3dr roll bar is 14mm and mounts across the outside edges of trailing arms
2wd saph is 16mm - mounts on inner of trailing arms. Less width has got to be good for reduced flex etc thus better resisting roll.
4wd saph is 18mm i believe approx 1.5 times stiffer than 3dr 14mm
escos is 22mm and i believe 3/3.5 times stiffer than 3dr.
to my mind running with an arb allows lower springs rates softer damping. So you could for instance have it fairly soft at the back for good squat and launch but still have good roll resistance in the bends.
Some say running with no arb is fine.
personally i prefer a rear arb. I run the std 3dr one on my car. Thats with gaz golds and adjustable 6 degree rear beam. Seems to handle well to me.
I am a internet keyboard warrior and no expert. Dont flame me just my opinion.
in other news your old 200 mountune block is absolutely tip top and loving life in my 3dr. Goes well for a mild 360 i tell thee.
Yes. Working from memory differences are as follows.
Std 3dr roll bar is 14mm and mounts across the outside edges of trailing arms
2wd saph is 16mm - mounts on inner of trailing arms. Less width has got to be good for reduced flex etc thus better resisting roll.
4wd saph is 18mm i believe approx 1.5 times stiffer than 3dr 14mm
escos is 22mm and i believe 3/3.5 times stiffer than 3dr.
to my mind running with an arb allows lower springs rates softer damping. So you could for instance have it fairly soft at the back for good squat and launch but still have good roll resistance in the bends.
Some say running with no arb is fine.
personally i prefer a rear arb. I run the std 3dr one on my car. Thats with gaz golds and adjustable 6 degree rear beam. Seems to handle well to me.
I am a internet keyboard warrior and no expert. Dont flame me just my opinion.
in other news your old 200 mountune block is absolutely tip top and loving life in my 3dr. Goes well for a mild 360 i tell thee.
I'll be rebuilding my saph engine for the 3dr the focus cossie project got scrapped bought a 3dr 😎
#15
Advanced PassionFord User
iTrader: (1)
Of the mk2 Sierra type there are actually quite a few different sizes. I did a calculation of what the stiffness is supposed to be based on this formula:
14 mm - 7.96 N/mm (Sierra XR4x4)
16 mm - 13.59 N/mm (Sapph Cosworth 2wd)
18 mm - 21.76 N/mm (Sapph Cosworth 4wd / Granada 24v)
20 mm - 33.16 N/mm (bug-eye Scorpio)
21 mm - 40.32 N/mm (bug-eye Scorpio 24v)
22 mm - 48.56 N/mm (Escort Cosworth)
As you can see the stiffness goes up very quickly with the diameter. A 3dr arb is also 14 mm thick, but is a lot longer than the later type arb so will be quite a bit softer. At a guess it might only be something like 5 N/mm.
I have a 21 mm Scorpio 24v rear arb on both my cars. I also used droplinks with rosejoints which give quite an increase on the arb stiffness as well, as the rubber in the standard droplinks is quite soft. What size is best depends on the rest of the suspension, so front arb, springs, shocks, etc. So it really is trial and error. But I'd say that around 20/21/22 mm is a nice size. Of course it also depends on what you personally like. When it is about being fastest on the track a softer rear arb on a 2wd car might actually be better for getting the power down.
14 mm - 7.96 N/mm (Sierra XR4x4)
16 mm - 13.59 N/mm (Sapph Cosworth 2wd)
18 mm - 21.76 N/mm (Sapph Cosworth 4wd / Granada 24v)
20 mm - 33.16 N/mm (bug-eye Scorpio)
21 mm - 40.32 N/mm (bug-eye Scorpio 24v)
22 mm - 48.56 N/mm (Escort Cosworth)
As you can see the stiffness goes up very quickly with the diameter. A 3dr arb is also 14 mm thick, but is a lot longer than the later type arb so will be quite a bit softer. At a guess it might only be something like 5 N/mm.
I have a 21 mm Scorpio 24v rear arb on both my cars. I also used droplinks with rosejoints which give quite an increase on the arb stiffness as well, as the rubber in the standard droplinks is quite soft. What size is best depends on the rest of the suspension, so front arb, springs, shocks, etc. So it really is trial and error. But I'd say that around 20/21/22 mm is a nice size. Of course it also depends on what you personally like. When it is about being fastest on the track a softer rear arb on a 2wd car might actually be better for getting the power down.
Last edited by Marc sierra; 24-04-2022 at 09:33 AM.
The following users liked this post:
smiley (24-04-2022)
#16
PassionFord Post Troll
Of the mk2 Sierra type there are actually quite a few different sizes. I did a calculation of what the stiffness is supposed to be based on this formula:
14 mm - 7.96 N/mm (Sierra XR4x4)
16 mm - 13.59 N/mm (Sapph Cosworth 2wd)
18 mm - 21.76 N/mm (Sapph Cosworth 4wd / Granada 24v)
20 mm - 33.16 N/mm (bug-eye Scorpio)
21 mm - 40.32 N/mm (bug-eye Scorpio 24v)
22 mm - 48.56 N/mm (Escort Cosworth)
As you can see the stiffness goes up very quickly with the diameter. A 3dr arb is also 14 mm thick, but is a lot longer than the later type arb so will be quite a bit softer. At a guess it might only be something like 5 N/mm.
I have a 21 mm Scorpio 24v rear arb on both my cars. I also used droplinks with rosejoints which give quite an increase on the arb stiffness as well, as the rubber in the standard droplinks is quite soft. What size is best depends on the rest of the suspension, so front arb, springs, shocks, etc. So it really is trial and error. But I'd say that around 20/21/22 mm is a nice size. Of course it also depends on what you personally like. When it is about being fastest on the track a softer rear arb on a 2wd car might actually be better for getting the power down.
14 mm - 7.96 N/mm (Sierra XR4x4)
16 mm - 13.59 N/mm (Sapph Cosworth 2wd)
18 mm - 21.76 N/mm (Sapph Cosworth 4wd / Granada 24v)
20 mm - 33.16 N/mm (bug-eye Scorpio)
21 mm - 40.32 N/mm (bug-eye Scorpio 24v)
22 mm - 48.56 N/mm (Escort Cosworth)
As you can see the stiffness goes up very quickly with the diameter. A 3dr arb is also 14 mm thick, but is a lot longer than the later type arb so will be quite a bit softer. At a guess it might only be something like 5 N/mm.
I have a 21 mm Scorpio 24v rear arb on both my cars. I also used droplinks with rosejoints which give quite an increase on the arb stiffness as well, as the rubber in the standard droplinks is quite soft. What size is best depends on the rest of the suspension, so front arb, springs, shocks, etc. So it really is trial and error. But I'd say that around 20/21/22 mm is a nice size. Of course it also depends on what you personally like. When it is about being fastest on the track a softer rear arb on a 2wd car might actually be better for getting the power down.
thanks again mate 😎
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