old round fart
Well-Known Member
I tried using my iPad for this post so I don’t have a compressor on it I can figure out. It was late and I was tired but was excited and wanted to post. I’ll work on it after my exercise today.
Birth of Long John
- Thread starter old round fart
- Start date
Indycars
Well-Known Member
These guides might be useful.
Post a Photo From an iPhone/iPad
Photo Software and Resizing
NOTE: The link to my NAS no longer is functional.
PaintNet is free if you download it from the link below. You can annotate and draw arrows with the software while also reducing file size.
Download
Click on the link in the graphic below.
Post a Photo From an iPhone/iPad
Photo Software and Resizing
NOTE: The link to my NAS no longer is functional.
PaintNet is free if you download it from the link below. You can annotate and draw arrows with the software while also reducing file size.
Download
Click on the link in the graphic below.
choppedtop
Well-Known Member
Those with laptops or desktop with windows can just use MS Picture Editor for about anything. It comes with just about all versions of windows.
old round fart
Well-Known Member
old round fart
Well-Known Member
]When you narrow the axle 8” and stretch the frame 60” thinking Ackerman will be close with stock steering arm is a dream! Only option is build your own! I started with the 3/8” rod on the front of spindle holding spindle straight. Tied string from center line of king pins to centerline of rear end. My steering arms will be 5” center of kingpin to center of tie rod end. That is the magic spot. Plumb Bob down and your golden.
Attachments
old round fart
Well-Known Member
I’m confused myself with the picture quality. I’m going to try better lighted pictures and better text. Stay tuned!
old round fart
Well-Known Member
With the help of Indycars (thank you) I think I may be able to make a little more sense of my steering geometry.
Top arrow- from center of kingpin to center of rear end.
Second arrow- Rod holding spindles straight ahead.
Vertical arrow- line from 5” from center of king pin along string on top arrow to match steering rod length from center of kingpin.
This will give me close Ackerman steering.
Does that make since or not?
Top arrow- from center of kingpin to center of rear end.
Second arrow- Rod holding spindles straight ahead.
Vertical arrow- line from 5” from center of king pin along string on top arrow to match steering rod length from center of kingpin.
This will give me close Ackerman steering.
Does that make since or not?
Kevinrevin
Member
Makes sense to me. I think you described it to be the Steering arm-to-tie rod joint is on the line from king pin-to-rear end line.
old round fart
Well-Known Member
It is only directly below it. The height is not important as far as geometry is concerned.
In my experience, if the ackerman angle is close you should not have problems. The only time for concern is if the ackerman is way off.
old round fart
Well-Known Member
I’m a retired Government employee. Close enough for Gov. work is 1) measure with micrometer 2) mark it with a piece of chalk. 3) Cut it with an axe. On my car I go for 1/16.
fluidfloyd
Active Member
Just a few numbers to muddy the water.I had a 1976 1 ton Chevy crew cab. Got to having problem eating left front wheel bearings. Usually killed the spindle surface under the inner bearing. Would go get a wrecking yard replacement. After going through two spindles I got tired of worrying about being on the road without a spare. Went down to the Local Pontiac dealers parts department and pricing a new one I realized there wasn't that much difference in price so I told him I needed it. He pulls on up but it had a 3'4 Ton part number and cheaper then the 1 ton. Looked at it and it measures exactly as the 1 ton I brought with me. Come to find out they used the exact same spindle on a 1 & 1/2 ton trucks no matter what wheel base you had. So, to answer Neshkoro's question of
1/8” or 6”?
117.5 in (2,984 mm)
131.5 in (3,340 mm)
164.5 in (4,178 mm)
I do still have a 1 Ton single cab with a long flatbed and will measure the WB next trip home. Evidently GM wasn't to concerned about it. I drove both of those trucks like sorts cars with the current one being in the mountains. I have read in several road and circle track racing that the Ackerman length was moved both forward or rearward to make the car turn better depending on what they wanted to do. Just getting it close in all probability is close enough. Take this for what it is. Just more muddy water to filter though the confusion. Have Fun!
George
1/8” or 6”?
117.5 in (2,984 mm)
131.5 in (3,340 mm)
164.5 in (4,178 mm)
I do still have a 1 Ton single cab with a long flatbed and will measure the WB next trip home. Evidently GM wasn't to concerned about it. I drove both of those trucks like sorts cars with the current one being in the mountains. I have read in several road and circle track racing that the Ackerman length was moved both forward or rearward to make the car turn better depending on what they wanted to do. Just getting it close in all probability is close enough. Take this for what it is. Just more muddy water to filter though the confusion. Have Fun!
George
fluidfloyd
Active Member
fluidfloyd
Active Member
Slight Correction.
had a 3'4 Ton part number and cheaper then the 1 ton. Looked at it and it measures exactly as the 1 ton I brought with me. Come to find out they used the exact same spindle on a 1 & 1/2
Should be 3/4 Ton & 3/4
No excuse for using braille on a screen. Even Ray Charles knew that!
Ray Charles
had a 3'4 Ton part number and cheaper then the 1 ton. Looked at it and it measures exactly as the 1 ton I brought with me. Come to find out they used the exact same spindle on a 1 & 1/2
Should be 3/4 Ton & 3/4
No excuse for using braille on a screen. Even Ray Charles knew that!
Ray Charles
fluidfloyd
Active Member
Very nice work! Very early dragster thinking, Just a bit stiffer in the frame rails I would suspect. Continue on Sir!
George
In my case, the ackerman apex actually comes together about 12" behind my rear end center section. I notice no ill effects.
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