rickyzZ28

iTrader: (28)

I ordered a set of Lunati .660 springs a few weeks ago and I recieved them shortly after. The problem is that there is no paperwork in the box. I bought them brand new from colorado speed so they were not used. I am looking for the coil bind height info and any other info about installing them. I know the install height is 1.800, but want to have all my bases covered when I go to install them next week. thanks

Darkman

iTrader: (2)

If you have the Lunati part number the Lunati website has specifications. I did not see anything called Lunati .660 on Colorado Speed although they listed more than one Lunati .650.

3rdCoastPowerSports

iTrader: (5)

I always measure coil bind height as well as seat LBS with a spring tester. take a spring to your local machine shop/engine builder and ask them to tell you the coil bind height and the seat LBS @1.800". also make sure you add a min of .050" to your coil bind height as a safety margin when doing your calculations

rickyzZ28

iTrader: (28)

The part number on Colorado Speed says 73925K1, but they should have them listed as a .660 spring. I took your advice and went to Lunatis site. I looked on there before but found nothing. When I searched by the proper part number 73925K1LUN it popped right up. Here is the link with the info at the bottom, springs

I have a spring tester I used when I set up my old LT1 heads so I guess its time to dust it off and use it. I also have an inside mic for measuring install height. So if I am doing my math right a 1.800 install height with a .649 MS4 cam and .050 safety puts me a 1.101. Coil bind occurs at 1.100. Is this too close for comfort as I know I will never be able to measure to .001 so it is essentially at coil bind. On their site they are saying install height is 1.810 and all the posts I have seen on here has install height a 1.800. Is 1.800 right? Thanks for all your help.

3rdCoastPowerSports

iTrader: (5)

if coil bind is @ 1.100" (true coil bind) + .050" (mandatory min safety margin) = 1.150" coil bind height.
1.800" install height - 1.150" coil bind height = .650" max lift. You can run all the way up to that number, meaning if you follow the proper calculations and you get a max lift of .650" then you can safely run a .650" lift cam on that spring.
1.800" is the installed height on LS1/LS2 heads. you need to measure it though because most actually install slightly less than 1.800" usually 1.795" or so. also if the springs are used and you have very tight piston to valve clearances then you might want to use a safety margin of .060" when doing your math.

ausls1

There the same ones iv got, got them in a comp cam and lunati valvespring package through a company.
Mine was the same had no paper work in it, was a sealed box with, was a little unusual as other spring kits iv had have had all the details on a paper in the box.

studderin

iTrader: (28)

ask colorado speed

3rdCoastPowerSports

iTrader: (5)

I was just showing him the math. I do not know the specs of his springs. The spring numbers I listed are for example purposes

01ssreda4

iTrader: (96)

They list .660 lift at an installed height of 1.81. Our heads usually setup at 1.80. So they are really a .650 lift spring on our heads. Clever marketing since there are lots of springs rated at .650 but not near as many with a higher rating. They are just trying to sell springs.

studderin

iTrader: (28)

Ya you need to check them. That math shows that, FYI the numbers they list are not right so you will be way off. theirs some computer term those guys use on data? crap in crap out, thats about sums up this thread.

The LUN Kit with the Platuim springs, installed alot more then 1.800, on a stock gen3 head. The CB is alot less then 1.1 thats gona mess up alot of guys if you start working off that numbers. I bet they do it because the seat they use it to tall for you to start shimming that kit up, you run into problems.

3rdCoastPowerSports

iTrader: (5)

Once again was showing him the formula not what his numbers were. Remove the numerical value and use xxx or yyy in their place. This of course is assuming the springs in question are made for your specific application