how do i get taller install height?
Thread Starter
Melting Slicks
Joined: May 2005
Posts: 3,394
Likes: 12
From: Leon Iowa
St. Jude Donor '06-'07-'08-'09
how do i get taller install height?
I'm sure you have read about my 918 springs breaking. I hear that the 918 spring needs to be set up at 1.80 so I checked mine the best i could and it seems to be around 1.631. How do i change it so it will be around the 1.80?
Pro
Joined: Oct 2005
Posts: 733
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From: Vanceboro NC
Originally Posted by mvvette97
I'm sure you have read about my 918 springs breaking. I hear that the 918 spring needs to be set up at 1.80 so I checked mine the best i could and it seems to be around 1.631. How do i change it so it will be around the 1.80?
Thread Starter
Melting Slicks
Joined: May 2005
Posts: 3,394
Likes: 12
From: Leon Iowa
St. Jude Donor '06-'07-'08-'09
Originally Posted by willyfastz
Change the shims under the springs.
Advanced
Joined: Nov 2001
Posts: 63
Likes: 0
From: Lawrenceville GA
???
Originally Posted by mvvette97
I'm sure you have read about my 918 springs breaking. I hear that the 918 spring needs to be set up at 1.80 so I checked mine the best i could and it seems to be around 1.631. How do i change it so it will be around the 1.80?
.169" too short seems like alot more than a shim change to get even close to the 1.800 recommended hgt.
How did you measure them? Hite mic, snap gauge??
If these measurements are indeed, correct, the valve stem length would need to be at least +.150, to get close.
Maybe remeasure with a Hite Mic, and take another look??
Team Owner
Joined: Mar 1999
Posts: 22,025
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From: At the beach in little Rhody
I don't think you have that installed height. I have 0.060" shims under my PSI springs right now, and they are at 1.750" installed height. Your shims would need to be 1/8" thicker. You need to get a hold of a valve spring micrometer and measure correctly. They aren't much money, and Summit or JEGS will have you one in two days. Make sure it has a range that covers the length you need as they come in different lengths.
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Pro
Joined: Oct 2005
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From: Vanceboro NC
You didn't install new spring seats when you installed the springs did you. If so did you remove the stock spring seats? Maybe you have two sets of spring seats on there which would probably give you that install height. And that would cause coil bind and break the springs.