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Old 02-19-2010, 10:39 AM
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spring question

Hey guys I got a set of AFR heads with a spring and valve package that can accomodate 0.600" of lift. I am looking at a cam and lifters that would put me at 0.587" lift, my question is how much extra clearance is the accepted minmum when looking at coil bind. In other words if coil bind is at 0.600" lift then what is the maximum valve lift I could safely run?

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Old 02-19-2010, 11:51 AM
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If they are rated to .600" lift,that means they will accomodate .600" without a problem, just make sure the spring rate fits the intended application. Coil bind for that spring would be somewhere .660" or higher, without the exact spring spec I couldn't tell you for sure what the actual coil bind # is.

You are perfectly safe at .587" lift, and if you were to look the actual spring spec up you might find that the spring is good for lifts in the higher than .600" limit.

Do you have a Part # for the spring, or the head package?? You might look it up at AFR's site if you want to learn more.
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Old 02-19-2010, 01:09 PM
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The best thing to do is find the spring part number, look it up at the spring man.'s website and then go from there. There's more to a spring than lift, so you need to know more than that about it. Most of these compaies are glad to helpand their tech is only a call away.
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Old 02-19-2010, 05:38 PM
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http://www.summitracing.com/parts/AFR-8017/

This is the springs I got that came assembled on the head
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Old 02-19-2010, 05:59 PM
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Quote:
Originally Posted by 383SBC
http://www.summitracing.com/parts/AFR-8017/

This is the springs I got that came assembled on the head
From the specs at AFR's site, that spring is maxed out at .600" lift just as they say, no room for anything more. The have it listed as "for use with hydraulic roller cams" 360#'s rate.
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Old 02-20-2010, 01:42 PM
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Ok I have found more info on it at AFR's website.
http://www.airflowresearch.com/valve_spec.php

They say max recommended lift is 0.600" and coil bind is at 1.050". Installed height is 1.800" leaving 0.750 before the spring binds. I am now looking at a cam that will put me at 0.605" lift, that's just a HAIR over the 0.600" recommended max. lift. Do you think this should be ok since it is only a tad over 0.600" lift?
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Old 02-20-2010, 03:22 PM
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Yeah, you should be ok. Normally, you want a total of at least 0.050" clearance at full valve lift. In other words, at full lift, if you can plunge a 0.010" feeler gauge strip between each of the 5 spaces between the spring coils, that totals at least 0.050" clearance (0.010" times 5) and you'll be fine.
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Old 02-20-2010, 05:13 PM
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Sorry, I did the math wrong in my earlier post, you will be fine at .605" lift as long as the spring rate will be good for what you are doing. Hydro Roller, Solid Flat, or Solid Roller?? Spring doesn't have enough rate for a solid roller and you are pushing it for a hydro roller, the 1.6 rocker could give you valvetrain control problems if you are going to try to push the rpm with Hydro's
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