| Re: [GMCnet] Front end string alignment [message #235138] |
Sun, 05 January 2014 11:39  |
Tom Whitton
Messages: 235
Registered: February 2004
Location: Paducah, KY
Karma: 0
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Can anyone direct me to a write-up on string alignment for the front end? I found an article on rear wheel string alignment presented in 2001 at a GMC Western States rally but can't find anything written about front end string alignment.
Thanks,
Tom Whitton
Updated 26 foot
Paducah, KY
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| Re: [GMCnet] Front end string alignment [message #235162 is a reply to message #235140] |
Sun, 05 January 2014 15:04  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| James Hupy wrote on Sun, 05 January 2014 12:47 |
Take that string, tie a piece of it around your finger to remind yourself to get together with a bunch of fellow gmc'ers in your area and co-op buy one of Jerry Work's laser alignment kits. Then you will all be able to align your coaches correctly.
Jm Hupy
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Jim,
While the plan is good, as I recall, Jerry's set only fits Alcoa wheels.
The other thing I have run into is that few places can accommodate the coaches track width and length. The only truck places around here that will get it are either a leave the coach there for three days and they will fit if in or ~150$ to set it up on the rack.
I'm not going back to Harold's Frame Shop in Novi. They were the people that jacked the coach up wrong, then tried to show me that it needed 300$ in parts and labor. If I'm going to buy parts, I'll get them from the right people. I called Dave Lenzi. He said that I probably don't need any parts at all. What I have to do and center the entire linkage. What do you know? He was right. But I still haven't found a rack that I can get the coach on for a reasonable price and in one day.
Oh, and Dave's talk through got me what I wanted and I still haven't had to replace any parts.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Front end string alignment [message #235168 is a reply to message #235138] |
Sun, 05 January 2014 15:29 |
Craig Lechowicz
Messages: 541
Registered: October 2006
Location: Waterford, MI
Karma: 0
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If you have ever been to an Indy Car race in recent years (at least since they have been running Dallara chassis) every IndyCar is aligned multiple times, front and rear, during practice and testing with yes, good old strings. I doubt very much that our GMC's push the performance envelope more than they do.
The tricky part is definitively and repeatedly finding the centerline of the chassis. Dallara made this easy as they include locating points for two special bars that bolt on the front and rear of the car to make it easy to string the strings. GMC's have straight frames that are relatively accessible, so you could do the two jack stands method with strings discussed in the link below.
There is an outfit called Smart Racing Products that makes a system for doing this on bodied cars. It's pretty spendy, but here is a link that discusses it a little and includes links to other write-ups. They are mostly used for toe, but with either multiple strings, or a flat floor and a steel framing square, camber can be done. It is not easy to do caster with strings, without a lot of math and other work.
<http://www.trackhq.com/forums/f295/string-alignments-1801/>
Craig Lechowicz
'77 Kingsley, Waterford, MI
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| Re: [GMCnet] Front end string alignment [message #235170 is a reply to message #235138] |
Sun, 05 January 2014 15:51 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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The Work kit is great. Did it myself and no pull and no odd tire wear. It would be nice if Jerry would offer the fixtures in 16.5 and 15 for my normal GM cars. I would think x number of turns of tape on all posts would take the 1/4 of slop out as would larger rubber feet. You can sort of "eye" the camber if way off and tape measure the toe but you have to have the tools to do caster. All you need to tell the guy is to get as much caster as possible while keeping zero camber. Its a trade off game. Then set the toe to zero with box on high point. Done.
John Lebetski
Woodstock, IL
77 Eleganza II
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