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Re: FInding IC on a 4 link
[Re: WILD BILL]
#992722
05/15/11 01:37 PM
05/15/11 01:37 PM
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Joined: Jan 2003
Posts: 16,925
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,925
NC
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I have a MicroSoft Excel file that does 4-link instant center calcs. But the board doesn't allow attaching. Quote:
The files you may upload must have the following extension: .gif,.jpg,.txt,.zip,.png,.pdf,.jpeg,.JPG,.GIF
If you would like it, email me. Here is a picture of it.
You need to put actual hole location measurements into it to match your car. Then you can change holes to see where the IC goes to.
Jim
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Re: FInding IC on a 4 link
[Re: 440Jim]
#992723
05/15/11 01:49 PM
05/15/11 01:49 PM
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Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
WILD BILL
OP
Senior Member of the Junior Dragster Club
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OP
Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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Re: FInding IC on a 4 link
[Re: WILD BILL]
#992724
05/15/11 02:11 PM
05/15/11 02:11 PM
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Joined: Jul 2007
Posts: 189
Newark, OH
springers340dart
member
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member
Joined: Jul 2007
Posts: 189
Newark, OH
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i had the same problem you did Bill with the car twisting with wheels in the air. i fixed that by (with the car on the ground) take a bolt of of your top bar on the passenger side. you get in the car and have your dad turn the bar till you can put the bolt back in. that resets your preload and mine left straight and level and didn't have a problem on the top end. this sig pic was before i did it i have one of after.
Last edited by springers340dart; 05/15/11 02:13 PM.
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Re: FInding IC on a 4 link
[Re: 440Jim]
#992726
05/15/11 03:30 PM
05/15/11 03:30 PM
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Joined: Jan 2003
Posts: 4,720
Moved to N.E. Tennessee
GomangoCuda
master
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master
Joined: Jan 2003
Posts: 4,720
Moved to N.E. Tennessee
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Quote:
I have a MicroSoft Excel file that does 4-link instant center calcs. But the board doesn't allow attaching.
Quote:
The files you may upload must have the following extension: .gif,.jpg,.txt, .zip ,.png,.pdf,.jpeg,.JPG,.GIF
If you would like it, email me. Here is a picture of it.
You need to put actual hole location measurements into it to match your car. Then you can change holes to see where the IC goes to.
Jim
Jim, can you Zip the Excel file and attach that?
In theory, there is no difference between theory and practice. In practice, there is.
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Re: FInding IC on a 4 link
[Re: springers340dart]
#992727
05/15/11 03:31 PM
05/15/11 03:31 PM
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Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
WILD BILL
OP
Senior Member of the Junior Dragster Club
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OP
Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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OK, here's the locations of the bolts (center) of each bar location.
They are the same left or right.
Upper front; 16"
Upper rear; 19 1/2"
Lower front; 8 3/4"
Lower rear; 8 1/2 "
I'll have to try and draw a pic on the computer to show what my hole loactions do as they are curved and not in a straight line.
However, the front upper holes are 3/4' on center. The front bottom areand both upper and lower rear hole are 1 " on center.
I think my heads gonna explode now 
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Re: FInding IC on a 4 link
[Re: WILD BILL]
#992728
05/15/11 03:36 PM
05/15/11 03:36 PM
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Joined: Jan 2003
Posts: 4,720
Moved to N.E. Tennessee
GomangoCuda
master
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master
Joined: Jan 2003
Posts: 4,720
Moved to N.E. Tennessee
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Just get a piece of chalk and draw it on your garage floor or use thumbtacks and string on your wall.
In theory, there is no difference between theory and practice. In practice, there is.
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Re: FInding IC on a 4 link
[Re: WILD BILL]
#992729
05/15/11 03:40 PM
05/15/11 03:40 PM
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Joined: Oct 2004
Posts: 1,752
detroit area
moderncylinder
top fuel
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top fuel
Joined: Oct 2004
Posts: 1,752
detroit area
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so you are saying that your passenger bar is 1/4" longer than the drivers side? so you have "reverse" preload? to preload the bar you would shorten it on the passenger side as compared to the drivers side in,, and 1/4" would be alot,, maybe thats your problem
i wouldnt change the 4 link positions, it looks like the car left ok and the tire looks ok,,, adjust your preload
scale the car with you in it ready to race first,, or after you just change the length of the top passenger bar
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Re: FInding IC on a 4 link
[Re: GomangoCuda]
#992730
05/15/11 03:41 PM
05/15/11 03:41 PM
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Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
WILD BILL
OP
Senior Member of the Junior Dragster Club
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OP
Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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Quote:
Just get a piece of chalk and draw it on your garage floor or use thumbtacks and string on your wall.
I got it all on paper but would need to do it in PAINT or something like that for you guys to be able to see it.
My drawing ability is worse than my reaction times 
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Re: FInding IC on a 4 link
[Re: Dragula]
#992733
05/15/11 04:14 PM
05/15/11 04:14 PM
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Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
WILD BILL
OP
Senior Member of the Junior Dragster Club
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OP
Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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I don't have acsess to scales 
I'll try the sliding bolt method but my bars don't have any flats so I'll just have to try and eye ball a 1/2 turn. 
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Re: FInding IC on a 4 link
[Re: WILD BILL]
#992734
05/15/11 04:22 PM
05/15/11 04:22 PM
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Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
WILD BILL
OP
Senior Member of the Junior Dragster Club
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OP
Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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My mistake. 
I just went to adjust the bars and remeasured to verify my starting point and I WAS WRONG.
BOTH upper bars are 19" long.
I'll go back up and edit the above post. 
Then double check all the rest of my measurements 
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Re: FInding IC on a 4 link
[Re: GomangoCuda]
#992736
05/15/11 04:38 PM
05/15/11 04:38 PM
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Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
WILD BILL
OP
Senior Member of the Junior Dragster Club
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OP
Senior Member of the Junior Dragster Club
Joined: Dec 2007
Posts: 10,542
BROOK PARK, OH
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Quote:
To set preload I would take the right front upper bolt out and adjust the bar so that the bolt just slides in. Then shorten that rod say three flats to preload the right side a little and try it out.
OK, I did that and quit frankly I think it's right back where it was to begin with but at least know we know what the sarting point is.
Bout a half turn of preload.
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