Michael_D

Did they check the springs yet?

BRING IT

They will check them tomorrow and I will post up the results.

Joezone914

I had the issue a few years ago in my z. Was not to noticeable on the streets as the more load it had the more obvious it was. So it be came very obvious in 3 and horrible in 4th so it was at the track I was always getting pissed. Did lots of research. One thing to check is inside the snorkel of the intake are little foam pads. If the glue comes loose pad can flop around and clog intake. This was not my issue but I did find it in my research.

My issue was bad alternator. I don't completely understand but it had some thing to do with improper voltage and ECU then getting or sending mixed signals. I had the problem 2 years and went to many dealers and shops before this was found. Even though it was fixed I was so tired of it and all the hype with valve guides I switched to zr.

BRING IT

Well broken valve spring it is!!

Dirty Howie

Was this a stock behive spring? It broke and you didn't drop or break the valve? Thats very fortunate!! Or did you have a dual spring??

Have they confirmed no collatetal damage and just need to replace springs??


DH

Dirty Howie

Was reading back to look for info and just saw this. I would have concurred and this is what I was thinking when I said I thought he broke something rather than a tuning/maf issue.

Good call ........


DH

BRING IT

No I have dual springs and one of the outer springs broke. As of right now it looks like no other damage and just the springs will need to be replaced.

Dirty Howie

I have received some crap in the past for mentioning one of the prime benefits of running dual springs. Looks like you are another example of duals saving a motor

I have the BT duals and am glad I do


DH

CHIWS6

good thing u had dual springs! Were the springs new?

Mark2009

I've read of several dual springs breaking on LS7's, but never a beehive spring breaking on one.

There may be a lesson in there somewhere . . . . . .



Edit: There was a rash of Comp Cam 918 beehive failures years ago, perhaps not on LS7's but on other LS engines, but Comp is pretty well known for providing mystery parts made who knows where by who knows whom... kind of like the duals we are seeing show up on LS7's currently . . . .
.

BRING IT

Well the dual springs definitely save my motor and a whole lot of money.

BRING IT

The shop said that they have seen about 5 cars with broken valve springs but they have always been the inner spring.

BRING IT

The springs were put in brand new when the heads were done but not sure how many miles are actually on them. They all will be replaced now though.

Mark2009

Ask them how may broken beehive springs they've seen.

Michael_D

Instead of just saying "one of my dual springs broke", or they said, she said crap, how about some details??? Like what brand and spring, installed height, distance to coil bind??

Just saying a valve spring does not say anything of any value.

BRING IT

Will do.

BRING IT

Well if I was a engine builder I might be able to answer those questions but since I'm not I don't know.

I'm going off of what they are telling me. I know they did say that they didn't know what brand of springs were in there becuase there was no markings on them. They did a leak test on that valve and it was good.

ctsv510

No one would expect you to know all that. Sometimes us normal folk frustrate the geniuses.

Glad to hear your motor isn't toast!

Jawnathin

What is meant here by 'breaking up'? Car won't rev past 4500rpm? Or could it go higher but it feels different, and if so, then how?

Michael_D

Sorry, my comments were directed more towards some of the other posters stating they "know someone who had a broke spring". That gets frustrating, as probably, 90% or so spring failures are due to improper installation or the wrong spring for the application. I personally, have not ever ran across a broke spring that didn’t break for a reason. I’ve ran across many springs that were flat out junk to begin with, but they didn’t break. They simply wore out too soon and lost load pressure (load on the retainer and seat).

A cylinder pressure test will not tell you that your spring is bad, unless you can pull a vacuum I suppose (never really tried that). It’ll tell you if the seats or rings are passing, or you have a blown head gasket, cracked block, but that’s about it. A leak down test is more informative that a compression test, but still doesn’t tell you anything about the spring.