Thread: 41 Willys lifting at high speeds

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oops, http://home.earthlink.net/~whshope/ Try the link again, I probably didn't put it in the thread right...nothing new for me I guess!!!!!

Thanks for the awsome link Dave, lots of great reading to be had there. As soon as I get done procrastinating I will read some of it.

I've had that link in my favorites for a long time, but haven't looked at it much yet.

Procrastinators unite. ohhhhh wait......wrong thread. Sorry

Originally Posted by mooneye777

Thanks for the awsome link Dave, lots of great reading to be had there. As soon as I get done procrastinating I will read some of it.

Yer welcome, Techinspector put that one up a year or two back, been one of my steady reference sources ever since.... Tons of good information in there!!!!!

excellent link Dave. Thanks I have a lot of homework to do. I will be going away for a week and will continue then. One point you brought up was when the power was on or off. When it violently dropped it was at the end of the run and I had let off. When I get back I will measure my four link and checkback. Really appreciate the help.
Thanks,Terry

Yup, when the slicks unload it would be the worst.... Had a couple cars that I had to lift lightly and let the slicks up slow or they'd bounce terrible...... Goodyear tires????

Please post a picture... side view.

If you have it set up like a 60's gasser I think the lifting will continue no matter what you do. Many of these cars crashed in the haydays on the top end. You don't hear too much about it but they did. When they got to 140+ they surely were not the most stable cars around. I can remember at least 4 Willys and a couple Anglias crashing at Minn Dragways back in the old days.

With your 4 link you should not have to have the front end way up like the old cars. Maybe level to slightly nose down and some 90/10 front shocks so the front end settles down on the top end.

My Willys only weighs 2440 with 1100 even on the rear end and it hooks pretty hard with just the Hoosier street radials. Just for reference my front end center section is only 5 inches off the ground and the top of the front fender radius is 23 inches. I really haven't had the chance to try it at speed but I don't really expect any problems. I don't have your power but when the blower comes I still have some 4 linke adjustment available.

Here is the side view of the gentlemens anglia with the same described problem. Of coarse this is after it was destroyed. I could not find the other side, where the roof took the biggest hit.

Most of these problems of ill handling cars come from a combination of several design flaws---any object will have varying amounts of lift/downforce from aero and it becomes signifinate enough at around 140mph for a 2500 pound vehicle to take FLIGHT----

But, with everyone in the world is making so many chassis kits, ladder bar, 4 link, coil over, air bag suspensions and every imaginable front suspension, anyone can go on the web and purchase kits and a 100 mig welder and build a racing chassis---- with an ompossible combination of angles, shock settings, spring rates, bump steer to sort out---every one of these suspensions have a point in there range where the angles bind up and will instantly transmit an uncontrollable dart/dive wander into the cars intended path that the driver can't control

Add that to the fact that the vehicle is probably either in flight or on the verge of flight that it really needs aero controls instead of a wheel steering apparatus and you have disaster

The more pronounced vertical shape that gives the higher lift/drag numbers becomes an object with a high roll rate one it gets sideways to the intended direction of travel--

All the 1940s era vehicle shapes should be restricted in there class structures that are allowed as they are and have demostrated that they are really unstable at the speeds people are trying to run them and there is absolutely no format for teching the complete vehicle---sure there are chassis/roll bar specs, but nothing else

Hi. Back from holidays. Any input on putting a 90 degree angle strip about 5/8 inch high across the width of the roof to disrupt the air from flowing smoothly over roof. A oval track racer told me about this. This should interrupt the different pressures between the top of car and the underneathe of car which I believe is part of this problem. I will post pictures of stance of car when I figure out how to post the pictures. Thanks again for the input.

A small strip might make a differance if you were close to being aero correct----In the case of your car--you have to not only work to being aero correct but within a set of rules---like 3 inches under the front of the car--
Your car will need considerable work top and bottom to stop the lifting and you still have the problem of the binding suspension angles/shock settings

Did you ever get the problem solved? First problem like others have stated would be horrible aerodynamics, IMO. I would imagine that the tall roof design and almost 90 degree windshield would be most of the problem. Probably the limit for that style car.
Why would a wing be a band-aid? I do agree the suspension should be tuned first.