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Author Topic:   VALVE SPRING COIL BIND??
Istock66
unregistered
posted October 10, 2004 03:09 PM           
I just bought a motor and it looks like the valve springs are very close to coil bind.

I can slip a .010 in between 3 coils.

Whats the normal standard allowance wanted?
Thanks Jeff


outlawstock17
Member
posted October 10, 2004 03:37 PM
.060"-.050" minimum depending on who you ask.


Istock66
unregistered
posted October 10, 2004 05:29 PM           
thanks, I was actually going to pm you but didnt find you in the first couple topics I looked at.

I assume that total, as in I add up whatever I can fit between all the coils??

I can fit that .010 all the way in on both sides should I get more precise and figure it out for sure?

I called the guy back I just got the motor from a couple hours ago and he said he did run it like it is before freshening it 8 races.

I also noted that the springs have diff shims under some of them and he confirmed that the shop he uses does a good job and makes sure each spring is set at the correct installed height for the correct rate.

I only paid 1000 for this motor ready to drop in and run at a claim race etc, but I still dont want to ruin it. The only reason I got worried about the springs at all is they are running stock retainers etc and they arent all even the same, just seemed cheesy.

thanks outlaw for your help. like I said I was going to pm you about it.



outlawstock17
Member
posted October 10, 2004 06:26 PM
the best way to check them is to use a spring checker. put your spring and retainer on the spring compressor and pull the spring down to your set up height. note the height and then pull it down until you get to your maximum lift. note the height and then pull it down until it binds and note that height. subtract the last 2 heights and you will have the clearance before coil bind.

i hope my explaination is clear enough...

the method you're using will get you close, but from what you described, your spings are a little too close for comfort. .030" isn't quite enough...

dirtbuster
Member
posted October 11, 2004 08:35 AM
I agree thats pretty close. if you cant get .010 between every coil i would be worried. Shoot for at least .060 total.


Istock66
unregistered
posted October 11, 2004 04:21 PM           
ok I know how its done at the machine shop, but I was just trying to double check them.

I measured again tonight intake and exhaust and can get .018 between 3 coils easily. I think they did set them up right after all, I was just worried.

This motor did run just like it is set up for 8 races.

thanks for the help I do appreciate the good advice I get from some people on here, thanks again.

jeff