How many RPM you going to turn it Sandy?
I think I would be more comfortable with more clearance myself, but I like to rev them up a little.
Mike's happy. I took the 6400 chip out of my shift light and put a 6000 in.
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| valve spring coil bind? https://slantsix.org/forum/viewtopic.php?t=37035 |
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| Author: | sandy in BC [ Tue Sep 08, 2009 1:36 pm ] |
| Post subject: | valve spring coil bind? |
I recently installed a higher lift cam and now have 30 thou clearance between coils on the valve springs. CompCams says you have to have 60 thou clearance. Is 30 enough? |
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| Author: | hantayo13 [ Tue Sep 08, 2009 1:52 pm ] |
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you need the clearance .... unless you like bent pushrods....lol...get some new springs....good to hear you still on this planet.....sorry to hyjack ...didi those Pa girls get thier tipi set up ???? walk in beauty |
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| Author: | slantzilla [ Tue Sep 08, 2009 2:41 pm ] |
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How many RPM you going to turn it Sandy? I think I would be more comfortable with more clearance myself, but I like to rev them up a little. Mike's happy. I took the 6400 chip out of my shift light and put a 6000 in.
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| Author: | sandy in BC [ Tue Sep 08, 2009 2:45 pm ] |
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The auto shifts at 5400...... |
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| Author: | hantayo13 [ Tue Sep 08, 2009 3:14 pm ] |
| Post subject: | |
you want the clearance....use to bend pushrods in my econo rail,,cause of valve spring bind...changed them ....no more bend pushrods |
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| Author: | sandy in BC [ Fri Sep 11, 2009 7:06 am ] |
| Post subject: | How does one measure coil bind clearance? |
I was looking around the Isky site last night and they suggest sticking a 10 thou feeler gauge between the coils .....6 coils at 10 thou each = 60 thou. I have 30 thou between each coil.....is that enough? Is Isky correct? |
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| Author: | Dart270 [ Fri Sep 11, 2009 7:24 am ] |
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With that clearance and 5400 RPM, my gut says you're OK, but I have limited experience here. Lou |
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| Author: | Exner Geek [ Sat Sep 12, 2009 8:04 am ] |
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My understanding is that the specified clearance refers to the difference between the actual installed height of the springs and the specified coil bind height. If you can get a .030 feeler guage between each coil you should have more than enough clearance. |
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| Author: | SlantSixDan [ Mon Sep 14, 2009 8:47 pm ] |
| Post subject: | Speaking of valve springs |
Some very interesting info on the subject of "Beehive" (or "conical") valve springs here. The premium pick if going with this variety of spring is said to be a Comp 26995 used in conjunction with Comp LS1 retainer. The budget pick is an ordinary Chrysler 3.3/3.8 V6 valve spring with '92-'98 3.1 Chev valve retainers and keepers. The 3.3 spring, properly shimmed, binds at .480"; the Comps go to .600" lift. See discussion on turbododge here. I spent some time looking at dimensional specs and it appears to me the beehive springs would be an easy retrofit onto a slant. |
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