I want to write....

[AllanD]

Is this true for full size as well? I've been looking for a correct [close] wheel base donor for a bunch of different projects. I may be closer than I knew.
Thanks,

Richard

Within the Ranger Line and within model year/generation range yes.

While it's NICE to have perfect Ackerman geometry it is actually quite rare for engineers to bother to accomplish it


Probably because perfect Ackerman geometry doesn't properly allow for deflection in the bushings and suspension arms themselves nor does it
allow for the "slip" that is inherent in tire design.

Let alone the induced steering effects of "Body Roll" and Designed in "bump Steer"

I "get it" but I have a 30year head start on many people here

AD

 

[scooter]

Who the hell is Ackerman???





Do one on power steering! ! !
Ive had a steering box apart to drill and tap it for hyd assist, and still didnt understand how it functioned.

 

[GoodOld85BlueBalls]

Let me meditate on that for a second....



OHM...............
OHM...............
OHM...............



Eh... I got nothin', but I'm vaguely hungry.

Ummm. Did you really just insult one of the most helpful guys on here

Allan posts more technical help than anyone. I'll leave it to him to tell you what you should eat to satisfy your hunger.

 

[scooter]

Ummm. Did you really just insult one of the most helpful guys on here

Allan posts more technical help than anyone. I'll leave it to him to tell you what you should eat to satisfy your hunger.

Pretty sure he was trying to be funny. At least thays the way i read it. Humor........

 

[alwaysFlOoReD]

Within the Ranger Line and within model year/generation range yes.
AD

Reading between the lines that sounds like it may not be true for full size. The reason I ask is I want to put d-44 outers on the d-35 and have the front behave reasonably well while driving fast on pavement. If the outers are basically all the same then I could quit searching as I have a d-44 front setting loose on the ground, unfortunately I don't know what it came out of and didn't want to re-build an unsuitable candidate. I'm wanting to make my race truck able to do more than just short course off-road, I feel the more seat time I have, the better driver I'll become. And there is some rallying and auto-cross I'd like to try.
Thanks for your input,

Richard

 

[gwaii]

Reading between the lines that sounds like it may not be true for full size.

it's the same deal for the fullsize-i was going to reply pretty much what allan did,but useing F-350 as an example.
just got too lazy to type it out.

so here it is.....the steering parts(and therefore the geometry)of a short box standard cab f 350 are the same as those on a crew cab long box,despite about a 4' difference in wheelbase.ackerman geometry is just not important enough to worry about on anything short of an all-out race car.

what's ackerman geometry?

roughly speaking,it's allowing the inside front wheel to turn at a larger angle than the outside wheel so it will follow the tighter circle that the inside wheels need to without getting tire scrub.

some of this is built into production vehicles,but tends to be an averaged amount so components may be used on a selection of different sized cars and trucks.

even on high-performance cars you run into the need for what's known as 'anti-ackerman' adjustments,which is the need to turn the outside wheel in tighter to compensate for weight transfer in cornering which results in scrub as the outside wheel takes the vast majority of the cornering forces.

in this case perfect ackerman geometry can result in an understeering car.


to summarize-blah blah blah glazed donut blah.

 

[85_Ranger4x4]

roughly speaking,it's allowing the inside front wheel to turn at a larger angle than the outside wheel so it will follow the tighter circle that the inside wheels need to without getting tire scrub.

All I know about it I learned here:

http://en.wikipedia.org/wiki/Ackermann_steering_geometry

 

[gwaii]

All I know about it I learned here:

http://en.wikipedia.org/wiki/Ackermann_steering_geometry

excellent way to pick up the basics.

i've been studying chassis and in particular suspension design for decades,and am somewhat amused when the subject of ackerman geometry comes up in reference to modified 4x4s.
i think it comes down largely to someone wanting to show off a new word they learned.

 

[scooter]

I like penut butter!!!
Wait what?

 

[GoodOld85BlueBalls]

Pretty sure he was trying to be funny. At least thays the way i read it. Humor........

Yep. So was my comment, if thats the way you read it.

 

[alwaysFlOoReD]

What I learned about Ackerman was 30 years ago in highschool shop. I was building a go-kart. Fast forward to a little while ago when I rolled my truck and started researching steering geometry. I figured I better know a little more about going fast.
Its slow going as I don't have the ambition or attention span I did 30 years ago. I didn't think it was too important in the dirt but thought on the street or auto-cross it would be more so. It seems for the average driver its unnecessary. But I still like learning as much as I can absorb, which some days isn't much.
Anyway, Gwaii and AllenD, thanks for the input,

Richard

 

[91 351w]

you should do one on the light system and all the wires and relays andstuff too.

 

[PhantomOfTheBumpside]

Ummm. Did you really just insult one of the most helpful guys on here

Allan posts more technical help than anyone. I'll leave it to him to tell you what you should eat to satisfy your hunger.

Ummm. Nope. I posted a suggestion for a tech article... and AllenD posted a very technical explanation of why very technical explanations like that don't work, using an electrical example (IE: Ohm's Law, without mentioning that it was Ohm's Law) and he further stated how he always got to see how quickly most listener's eye's GLAZED over...

Now, having a bit of fun with his very technical explanation of why very technical explanations do not work, I simply provided a simulated real world example of said phenomenon. (IE: I made the post as if I weren't listening, I changed eyes glazing over to underlined GLAZED DONUTS, and meditated on the subject using OHM to show, yeah I really was listening, and finished the distracted act with an unrelated comment to the 'mis-understood' Donuts reference that didn't really exist. Kind of like how posts have a tendency to get mis-directed, by Off Topic content and we all wonder how that happened.)

Hope that clears up any misunderstanding you may have had... and Thank You for the Negative Rep , I understand it just means you were looking out for AllenD, but kind of makes my joke that much more meaningful...

Then again, Talvez meu gracejo não traduz bem.

 

[Will]

Whut

?

 

[PhantomOfTheBumpside]

Exactly!