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Apr 25, 2012 | 12:38 PM

#21

punishmentcycle

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why did u go with such a big spring? the sound might be the valves slamming closed alot harder than they should

Apr 25, 2012 | 01:01 PM

#22

wcryan

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From: Escondido CA

It's not coming the the valve cover area though. That's why I think it might be the lifters. Those were just reccomended to me because of the success they have had with them

Apr 25, 2012 | 04:23 PM

#23

ichpen

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Quote:

Originally Posted by wcryan

It's the Texas speed .650 dual valve springs. Low lift cam. Can't remember the specs off the top of my head

Is it these springs?

http://www.texas-speed.com/p-474-pre...pring-kit.aspx

BTW, speaking from experience (having pulled the motor for a rebuild on no less than 2 occasions, sigh) there's almost no scientific way of figuring out where ticking is coming from. Not with the reverb halls that are our aluminum blocks. I've had tens of experienced mechanics and engine builders try to figure out the issue from above but in all cases were wrong. Pulling things off is sadly the best way.

Last edited by ichpen; Apr 25, 2012 at 04:29 PM.

Apr 25, 2012 | 05:12 PM

#24

wcryan

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yeah, I think it's those

Cunningham is going to go from the least invasive to the most invasive

So we'll see what it is when they are done

Apr 25, 2012 | 05:59 PM

#25

ichpen

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Quote:

Originally Posted by wcryan

yeah, I think it's those

Cunningham is going to go from the least invasive to the most invasive

So we'll see what it is when they are done

Pray it's not what I had...

Apr 25, 2012 | 06:06 PM

#26

wcryan

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a bad cam? I kinda want a new one. haha

Apr 25, 2012 | 10:05 PM

#27

itsslow98

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Quote:

Originally Posted by punishmentcycle

why did u go with such a big spring? the sound might be the valves slamming closed alot harder than they should

Boosted cars need a tougher spring anyways.

Apr 26, 2012 | 03:10 AM

#28

wcryan

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From: Escondido CA

Elaborate on that Allen. Seriously. I'm not trying to pound u like everyone else does on this forum. I just wana know

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Apr 26, 2012 | 04:26 AM

#29

itsslow98

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High cylinder pressures with boost. Weak valve springs cant handle it.

Apr 26, 2012 | 04:47 AM

#30

wcryan

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so your saying the .650's were a good choice?

But not only that, an ok choice?

I dont want springs that will **** up my setup. I dont think the boys at cunningham would set me up for failure

Apr 26, 2012 | 06:51 AM

#31

ichpen

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Quote:

Originally Posted by wcryan

so your saying the .650's were a good choice?

But not only that, an ok choice?

I dont want springs that will **** up my setup. I dont think the boys at cunningham would set me up for failure

You know my story. Heavy springs (mine were v similar to yours, maybe a tad heavier) essentially caused very premature cam wear and a couple of morel lifters to take on some face paint as a result. This is daily driving, not on the track. Not saying that happens to all but my engine builder (who seemed to know his crap) was very insistent to be careful with dual springs (as they are inherently heavier with more seat/open pressure), and only use them if I absolutely need them.

I'm also always confounded by shops that sell kits with light titanium retainers, lighter rocker arms etc etc, designed to lighten your top end then slap on a massive/heavy dual valve spring. Makes no sense to me.

You can get lighter duals or good singles.

Apr 26, 2012 | 08:51 AM

#32

Onefast V

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Quote:

Originally Posted by itsslow98

High cylinder pressures with boost. Weak valve springs cant handle it.

While this is true, 145# of close pressure is extremely higher than the stock 95#. On a lower lift cam with boost he should need to run more than 120# of closed pressure. too stiff of springs will cause failures.

Apr 26, 2012 | 09:09 AM

#33

ichpen

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Quote:

Originally Posted by Onefast V

Correct. 120 on the seat and under 400 open is what you should be aiming for.

Apr 26, 2012 | 10:48 PM

#34

itsslow98

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Quote:

Originally Posted by Onefast V

I wasnt necessarily saying that the springs he was using were ideal, but a cam with 560 lift and boost wouldnt be good with springs rated for 575 lift. Also all dual springs witha lift rating and titanium retainers are not created equal.

Patriots for example use titanium retainers that are considerably heavier then a set of PSI springs with titanium retainers.

Apr 26, 2012 | 11:58 PM

#35

heavymetals

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Check this:

http://forums.corvetteforum.com/c5-t...ity-party.html

YEOW!

Apr 27, 2012 | 09:44 AM

#36

wcryan

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^ ouch. Hopefully mine isnt like that

Apr 27, 2012 | 12:45 PM

#37

ichpen

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Quote:

Originally Posted by heavymetals

Check this:

http://forums.corvetteforum.com/c5-t...ity-party.html

YEOW!

Mine was quite similar, not as bad and none of the lifters were that worn down but yeah cam lobe was toast. Wish I kept a pic but changed phones and lost a bunch of pics.

Expensive lessons these.