I'm in the middle of a build where I used a suicide style axle for the front end. I used a 36 ford axle, wishbones and buick brakes for stopping. I'm a bit concerned about the ackerman principle and realize that this is not a great set-up if you want to keep ackerman in spec. Nevertheless, I went forward with the project and would like to see some examples of what other more experienced hot rodders have done. Your pics and comments will be greatly appreciated. Happy New Year to all !
heres a pic of my spring setup and search http://www.jalopyjournal.com/forum/search.php?searchid=2955840
Spring location does not effect ackerman. Fitting the tie rod in front of the axle destroys ackerman unless the arms off the spindles are modified and in most cases they cannot be. Yes, I know that plenty of people run the tie rod in front of the axle but it is still wrong. Looking straight down on the car if you take a line from each king pin thru the tie rod end towards the rear of the car the lines should meet at the centre of the rear axle. Google Ackerman and you will soon see what I mean.
Do you want to run the spring behind the axle as in the photo or on top of the axle? This little guy has what is pretty much a standard suicide perch. This T has Quarter elliptic Springs. A clean and nifty setup. It isn't super spendy either if you do most of it your self. Another angle on the Same T A more traditional T with the suicide pearch peeking out behind the license plate with the spring mounted behind the axle. another shot of the same car from a different angle. You could probably google T bucket or suicide front end or Suicide axle and get enough photos of different styles of Suicide front ends to keep you busy sorting them out for months. Some even link right to threads here.
A bunch o pix: http://picasaweb.google.com/poutous/SuicidePicturesFromTheInternet Also - this thread was the last BIG one on this topic. http://www.jalopyjournal.com/forum/showthread.php?t=197058&showall=1
Skoford, Please be careful with that set-up. I had mine that way as well. I never had one fail but look at the pic. Kind of scary. I also know another Hamber who had one come apart at 35 mph. He got lucky and it only slid, No dig-in and roll. I suggest you at least use perch bolts welded into the bones so there is no improper load on the mounts. I thought if it was good enough for a t- bucket why not in the bones? right? .....Wrong! These mounts were intended to be through a plate where the load is on the collar and not hanging on the threads. Therefore they will bend, corrode and eventually fail. With a perch bolt you can load it like that and be safe. Look up posts by RoadRatEddie and see how he did his after the failure. You will see in the lower set (second set) that I even tried to use washers to tighten the mounts against the bungs and spread the load and stop the bend. They still bent. I can not even remove the jamb nut from this one, not even with a wrench. There are other mounts that I've seen that are nice and heavy too, but the perch bolts seem best.
http://www.jalopyjournal.com/forum/showthread.php?t=197058&highlight=LRS30&page=6 Here you go they were a little kinder on your request than mine... But cooler heads have shown and things are all happy now......Hope this helps....Ryan
whe we set the inserts we made sure the the perch was tight and at the angle we were after. so hopefully there wont be a problem
I thought I did it right too (same as you with the second set). Just hate to see anything bad happen. Like I said, keep an eye on them. I have rid of that set up completely now.
Gents The comments and pics have been very informative and I thank you all for responding to my questions. In one of the posts, I needed to clarify that I'm running the spring behind the axle. Also, the spring will be attached rather than thru the wishbone as you see on many builds, it will be mounted thru 1/2 inch plate that has been welded to the bottom of the wishbone. The plate is tapered and starts out being about 1.5 inches and is about 18 inches long. It tapers down to about 1/2 inch at the other end. We drilled a hole thru the plate through which the spring perch bolt will be inserted. Ackerman still is a concern. I know that if its not correct, there will be increased bump steer. I thought this post might give some insight on peoples experience with the tie rod located in front of the axle, which technically tends to mess up the ackerman principle unless the steering arms are modified to come in line with the necessary geometry. Any other comments and suggestions are always appreciated. I hope this has been a helpful thread to the readers.
Bump steer and Ackerman are 2 separate beasts all together. But i do agree, when messing with one the other can be affected...
I got the short perchs through my wishbone. I got mine for P&J from the pic they look a lil more stout but it could be the pic as well...