Search found 169 matches

by BillyShope
Wed Jun 23, 2010 4:12 pm
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

Jeff, I suppose there's some distortion when I print the picture you posted, but it looks like that forward point would involve placing the fronts of both upper and lower links in the top hole, the rear of the upper link in the bottom hole, and the rear of the lower link in the second hole from the ...
by BillyShope
Wed Jun 23, 2010 6:58 am
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

Looks good, Jeff. Very close to 100% antisquat. There's another combination, though, at about 65 inches forward, which will give you the same performance and be affected less by ride height changes. You might consider it.
http://www.racetec.cc/shope
by BillyShope
Thu Jun 03, 2010 9:04 am
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

The laws of physics cannot be denied. Very true. But, they must be properly applied. With an analysis of this sort, it is important to satisfy the physical constraints for the overall system before considering the internal forces and moments. To illustrate the absurdities that can cloud an analysis...
by BillyShope
Thu Jun 03, 2010 7:45 am
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

Tell us who's car you have worked on that the lower bars are meaningless as far as angle????????? The Ramchargers' C/A. We were concerned only with the IC location relative to the 100% antisquat line. Note that I said the lower link angle, in itself , is meaningless. It becomes very meaningful, how...
by BillyShope
Wed Jun 02, 2010 8:29 am
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

This is where you are wrong Mr. Shope. Mike, compare that which Mr. Budd is saying and that which I have on Page 45. Obviously, there's a difference. I have used the most basic principles of mechanics to develop the conclusions. With a very little effort, anyone can use thumb tacks, string, and car...
by BillyShope
Wed Jun 02, 2010 6:07 am
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

Mike, Bob says "If you run too flat with the bottom bar, or one that travels uphill to the chassis...compromising hook". In my case, the bottom bar is on 0 degree. About the upper bar, it is with 12 degrees... Suggestions? Regards, Again, read Page 45: http://www.racetec.cc/shope/tim.44.h...
by BillyShope
Fri May 28, 2010 8:34 pm
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

Billy, you really ought to go to the dirt track races.... Wasn't even thinking about dirt track when I posted. Was thinking asphalt. When it comes to dirt, driver skill plays such a large part that it seems car setup can almost be forgotten. That's "almost." I've read the biography of A. ...
by BillyShope
Fri May 28, 2010 3:42 pm
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

I have seen this.... Would like more information. Oval racers...often having very different spring rates across the front...apply hard braking thousands of time every Saturday night without the problem you describe. Not doubting you, but I'd like more information. You still have not answered that Q...
by BillyShope
Fri May 28, 2010 3:21 pm
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

John_Heard wrote:How do travel limiters factor into what you're thinking about Billy?
Don't like 'em! While a travel limiter setup might provide equal tire loading at some instant in time, the jerking around can cause too many other problems.

Don't like 'em!
http://www.racetec.cc/shope
by BillyShope
Fri May 28, 2010 3:05 pm
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

...instead of just taking into account the suspension link angles and their relationship to anti-squat percentages. This is certainly not the analysis procedure an engineer would use. A free body diagram must be made and force and moment balance equations established for each suspension component. ...
by BillyShope
Fri May 28, 2010 6:00 am
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

I have a leaf spring stock suspension car, so it's a bit tough to try on mine. John, achieving equal rear tire loading is a problem with both leaf spring cars and ladder bar cars. But, it can be done. The asymmetry has to be at the front of the car, however. With adjustable coilovers at the front, ...
by BillyShope
Thu May 27, 2010 6:07 pm
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

Setting the suspension links to optimize one instance during the run.... One more time: Optimization is achieved with asymmetry THROUGHOUT the run, As long as the engine is supplying torque...at any level..., the tires are equally loaded. Preload and/or use of an ARB, however, DOES provide, at best...
by BillyShope
Thu May 27, 2010 11:15 am
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

...I'd be afraid of what it might do down track and when the brakes were applied. All the way down track, the tires would remain equally loaded. In other words, you'd have the safest possible setup. This is totally independent of engine power level. As for braking, braking forces would also remain ...
by BillyShope
Wed May 26, 2010 3:12 pm
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

One hole change could be 5/8 to 3/4 of an inch...That a ton!!!! I didn't make this clear: With that which I'm suggesting, there is NO preload. You can approach equal rear tire loading by preload, ARB, preload AND ARB, or with an asymmetric adjustment. Since the link loads are proportional to the dr...
by BillyShope
Wed May 26, 2010 6:23 am
Forum: Chassis and Suspension
Topic: 4 Link System - Step by Step
Replies: 229
Views: 126574

Re: 4 Link System - Step by Step

So you want the 4 link bars at different angles???? Left to right, yes. This is an old, old trick, used, for instance, by Jaguar on their Le Mans-winning C-Type half a century ago to improve acceleration out of the corners. In that case, however, it was a matter of moving the center link of a 3link...