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-   -   Front springs rubbing wishbone (http://www.madabout-kitcars.com/forum/showthread.php?t=787)

SDMC001 28th August 2006 12:32

Front springs rubbing wishbone
 
I have already got two new front wishbones from Mark Mathews, which made absolutely no differance. I have set the ride height, and the front springs are rubbing on the inner wish bones, has any one had the same issue, and if what was done to cure it.

Thanks Steve

alackofspeed 28th August 2006 13:05

Yep, mine rub when on the build stands, and when I had the car on wheels the other week it looked as though there will be problems in use.

I've not raised it with marlin, as I've got a number of other ill-fitting parts (exhaust, gearcable bracket, driveshafts....) to get sorted, and I'm just starting to work through them.......

BIG_Fella 29th August 2006 11:37

Mine is rubbing but it is still on axle stands
I am hopefully getting me brake discs this week so i will find out if it still rubs when it is down on the wheels this weekend
I will post the out come when that happens

Jerry

bigrich 3rd September 2006 16:02

Firstly I'm assuming your using standard GAZ shocks and springs from Marlin....if so then there should be no fouling at all. The springs are pretty close to the susp wishbones when the car is on the deck but they do clear easily.

Have you got the upper wishbones on the right way round?...have a look at pictures on the gallery..there is a shot of the silver demo car and my orange one showing correct orientation.

Otherwise...not sure, post a picture up of your installation so I can see it.

Rich

alackofspeed 3rd September 2006 21:58

Hopefully it's clear to see my wisbones go inside the coils.

http://www.johndry.com/gallery/main....avId=x8671e3f2

bigrich 4th September 2006 11:57

Mmmmm....looking at your pics the assembly looks correct.

From memory mine were very close when on stands but once on the deck the clearance increased and is OK.

Rich

alackofspeed 4th September 2006 12:14

Quote:

Originally Posted by bigrich
Mmmmm....looking at your pics the assembly looks correct.

From memory mine were very close when on stands but once on the deck the clearance increased and is OK.

Rich

I think unless the wishbones were massively incorrect, they'd only fit one way around.

To put the situation with my car in perspective, when on the deck, i have to rotate the springs so that the arm can slot between the coils. Admitedly the front of my car is still pretty light, but to get around this I set the ride height at a "reasonable" level, and still the spring were too close........ especially when one accounts for the fact the arms move either side (up and down) of the static position.

I'm watching what happens with Steve's situation before doing anything about mine.

SDMC001 4th September 2006 12:30

Springs issue
 
I spoke to Mark Mathews last week over the issue, and he has reccomended a change in spring lenght to be the best way he can see to overcome the problem. He is working on a car or has recently been working, not sure but the upshot is, he has used 7.5 inch 300LBS springs. I will be looking down this route myself now, so I can move on.

Steve

craig 4th September 2006 13:14

My car is still on the build trolley but springs catch on arms aswell, like John's my arm travels through spring!

Steve if the answer is new springs does that mean we will be supplied with new ones from Marlin if we contact them? Free of charge obviously!!

Craig

alackofspeed 4th September 2006 14:01

I don’t think any of us should be happy with that “fix”. If shorter springs are fitted, then the effective suspension travel will be reduced, and the chance of unseating and fully compressing the spring will be increased.

If our cars don’t work with the gaz shocks and springs, and every chassis preceding our has been fine, then the reason for this needs to be determined, and proper remedial work undertaken.

A shorter spring shouts “bodge” to me, and is not acceptable.

marlinturbo 4th September 2006 14:36

just a thought guys, but could u measure the outside diameter of the springs?
are they 2.25"?

the assembly in the picture looks correct to me.
however you have you're top camber rod end wound out quite a long way.
when on the road the upper wishbone does not clash with the springs on mine.

HTH

John

alackofspeed 4th September 2006 15:05

Quote:

Originally Posted by marlinturbo
just a thought guys, but could u measure the outside diameter of the springs?
are they 2.25"?

the assembly in the picture looks correct to me.
however you have you're top camber rod end wound out quite a long way.
when on the road the upper wishbone does not clash with the springs on mine.

HTH

John

Iíll measure mine later, but as they seat correctly on the shock I suspect theyíre the correct diameter. The camber of the wheel isnít too far off vertical when on the ground (itís hard to perceive), which makes me wonder if the top arm is shorter (or the connection at chassis / hub different) than yours Ė that would certainly explain the clash weíre experiencing.

Perhaps one of the people with non-clashing arms could take some pictures with a good ruler / digital vernier in the shot?

SDMC001 4th September 2006 16:07

Spings issue
 
I had not considered the suspension travel issue, I do tend to feel this is a bodge, but I have found trying to get the answer I am looking for so difficult, my initial reaction was one of, on well another hurdle crossed. Judging by the responce of others this is something that will not go away in a hurry, and Mark needs to sort it out. I know some of you have had issues, it would be intersting to contact Mark and see how he deals with your concerns.

Steve.

SDMC001 4th September 2006 16:11

Spring issue
 
I did get a reply from two other buiders who when they measure their wishbones in relation to the chasis the gap was about 180mm to where the two arms weld, in my case this was about 170mm ish, I tried several times to convince Mark of this, but he said that was the template used on all the cars. I personally do have reservatons over that.

Steve

alackofspeed 4th September 2006 19:56

Some more pictures of my car's nearside front suspension:

http://www.johndry.com/gallery/main.php?g2_itemId=2431

I'll get in touch with Marlin later this week.

marlinturbo 5th September 2006 14:17

http://img245.imageshack.us/img245/441/fuafmu3.gif

Before calling Mark, measure you're front upper wishbone.
If the dimensions are as shown then carry on with you're build, as this works fine.

Re-assess this when you have wheels on, ride height and camber/toe settings correct.

John

alackofspeed 6th September 2006 17:20

Cheers John.

The 149 mm on your drawing, is more like 144 mm on my left arm. The other dimensions appear to be the same, which makes sense given what Mark Matthews told me yesterday.

Apparently the hard points are jigged, but the diagonal (for want of a better description) "...if cut a bit short, or a bit long, gets placed where it fits best..."

Whilst there are more features that dictate the co-ordination of the components, I beleive there is at least one error on my car.

Incidentally I've had the car on the ground, and have played with ride height and bounced the car. The geometry isn't perfect but it's not rediculous, and my springs audiably 'pop' past the arm!

John.

grant620 14th September 2006 19:17

My experience seems to show that the "jig" or template that MArlin use must be made of elastic...
Not many of the parts on John's car are aligned properly.
P1ss poor IMO.

MartinClan 14th September 2006 20:12

Quote:

Originally Posted by grant620
My experience seems to show that the "jig" or template that MArlin use must be made of elastic...
Not many of the parts on John's car are aligned properly.
P1ss poor IMO.

Some of of Sportster builders have suffered similar problems. The top mount for my rear springs are in completly the wrong place causing the top and bottom bump stops not align. Mark's first comment was "it didn't really matter" - I intend to press him a bit more on this. At the moment it looks like I will have to cut them off and get a "mobile welder" to re-fit them in the correct place - at MY expense. I am not impressed....

Robin

alackofspeed 14th September 2006 23:46

Quote:

Originally Posted by grant620
My experience seems to show that the "jig" or template that MArlin use must be made of elastic...
Not many of the parts on John's car are aligned properly.
P1ss poor IMO.

I'm getting quite infuriated with the parts that don't fit on my car - the last few weeks have been spent fabricating...(engine mounts, pedal box, gear cable mounts, gearshift linkage).... the latest issue is that my exhaust doesn't fit and I need to "...bend it...."........all very well and good if it were the lightweight hangers that needed tweaking, but it's all completely out, and bending 2.25" stainless tube is quite difficult!


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