85buggy
Is there room to pass ?
New 4 link on a buddies Toyota. When we compress
The coil overs the pinion rotates upward. What's up ?
The coil overs the pinion rotates upward. What's up ?
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Help Support Hardline Crawlers :
New 4 link problem mayb
- Thread starter 85buggy
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Jduck
Well-Known Member
85buggy said:
how long are the uppers vs the lowers? how much vertical seperation at the axle and frame.
Re: New 4 link problem mayb
Look at the axle end of the links. Remember, as they swing, the location of the link bolt moves in horizontal plane front to back. If the upper link end gets shorter faster than the lower, or the lower gets longer faster...the pinion moves down
Look at the axle end of the links. Remember, as they swing, the location of the link bolt moves in horizontal plane front to back. If the upper link end gets shorter faster than the lower, or the lower gets longer faster...the pinion moves down
85buggy
Is there room to pass ?
Will post measurements in the morning
Neal3000
Well-Known Member
Re: New 4 link problem mayb
I can't get my head aroung that man.......but i bet his upper links are too short
pachary said:
I can't get my head aroung that man.......but i bet his upper links are too short
Technician
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Too much vertical separation at the frame. bring the upper and lower links closer to gether at the frame. I start at the axle ane make my separation 25% of the tire size and the aim both sets of links towards the top of the bell housing. This should make it squat neutral.
Re: New 4 link problem mayb
Neal,
Build a side view mockup out of cardboard or plywood. Attach the frame end of the "links" and draw a vert line perpendicular to the ground where the axle centerline would be. Put a fixed length link between axle end pivots.
Move the axle end up and down and you will see how that vertical link will tilt as the suspension compresses.
There are other things to look at, but this will illustrate the pinion roll.
Oh, I am far from being an expert, but this is how I got to understand the link/pinion relationship. But like Tech said, separation affects this too.
Neal,
Build a side view mockup out of cardboard or plywood. Attach the frame end of the "links" and draw a vert line perpendicular to the ground where the axle centerline would be. Put a fixed length link between axle end pivots.
Move the axle end up and down and you will see how that vertical link will tilt as the suspension compresses.
There are other things to look at, but this will illustrate the pinion roll.
Oh, I am far from being an expert, but this is how I got to understand the link/pinion relationship. But like Tech said, separation affects this too.
Technician
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Re: New 4 link problem mayb
Of course I make this statement assuming that the top of the bell housing is the COG. Which it usually is.Technician said:
85buggy
Is there room to pass ?
I don't understand the comment with the bell housing in it.
My bottoms don't point toward the bdll housing
My bottoms don't point toward the bdll housing
Technician
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Re: New 4 link problem mayb
The top of the bell housing is addressing the COG. This will dictate your squat and anti squat. If you are parallel with each other it is probably ok it more than likely has anti squat. If they are aimed at the COG they will be squat neutral.
The top of the bell housing is addressing the COG. This will dictate your squat and anti squat. If you are parallel with each other it is probably ok it more than likely has anti squat. If they are aimed at the COG they will be squat neutral.
Technician
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Re: New 4 link problem mayb
http://www.pirate4x4.com/forum/newbie-general-4x4-discussion/212765-anti-squat-hurts-my-brain.html
Here is some good info I found about squat and AS. With pics
http://www.pirate4x4.com/forum/newbie-general-4x4-discussion/212765-anti-squat-hurts-my-brain.html
Here is some good info I found about squat and AS. With pics
TBItoy
Well-Known Member
85buggy said:
Has is got one of them Trail Gear link kits on it?
They have funky geometry like that because the uppers are longer than the lowers
Lickliter21
Well-Known Member
Re: New 4 link problem mayb
Had the same problem on my first 4 link build. The uppers where longer than the lowers (trying to get longer links) and pinion went up as the suspension was compressed.
TBItoy said:
Had the same problem on my first 4 link build. The uppers where longer than the lowers (trying to get longer links) and pinion went up as the suspension was compressed.
TBItoy
Well-Known Member
Re: New 4 link problem mayb
It works ok on the front in some instances if the uppers a lil longer than the lowers, it can keep it from binding the u-joints when flexing (since the diff is offset in the front and drops out when flexing)
Generally not a huge problem in the rear unless the angles/ride height is crazy or if the links are a huge difference in length.
Lickliter21 said:
It works ok on the front in some instances if the uppers a lil longer than the lowers, it can keep it from binding the u-joints when flexing (since the diff is offset in the front and drops out when flexing)
Generally not a huge problem in the rear unless the angles/ride height is crazy or if the links are a huge difference in length.
85buggy
Is there room to pass ?
I'm thinking that may b the problem.
Going yo get dome measurements and post them
Going yo get dome measurements and post them
85buggy
Is there room to pass ?
Links r 34 top 37 bottom distance between 5 front 7 rear
TBItoy
Well-Known Member
85buggy said:
Are the lowers triangulated a bunch?
Oh, and are you trying to change or fix something, or just curious about the pinion movement?
Re: New 4 link problem mayb
Lets see a side pic.
If the uppers angle down (frame towards axle) more than lowers, then the effective length of the upper will change faster than that of the lower.
This will rotate the pinion up on compression.
Lets see a side pic.
If the uppers angle down (frame towards axle) more than lowers, then the effective length of the upper will change faster than that of the lower.
This will rotate the pinion up on compression.
