[Z06] 2010 ZO6 DROPPED EXHAUST VALVE...! Video...
07-28-2012, 12:56 PM
#421
Race Director
I'll have to order a couple of the new part numbers if I cant get them from WCCH...I can't believe they can make this valve for 28$ that is F'ing ridiculous, that's like 1.5 lap dances. Haha....maybe this is the reason there has been variation, the cost doesn't justify QC time??
For me, seeing the thin walls in this valve and the variation in the other immediately turns into differential thermal profiles on all these valves. Which would explain why the tunes have actually had an effect on them. If valve X has a nice even .039 wall versus valve Y at .029 the amount of thermal stress and fatigue They both see is going to be wildly different. Let's hope the new ones had a beefed, more uniform wall. I would still like to see .050 of wall in there, it just seems so thin to be in exhaust temperatures of 1200F-1600F and repeatedly hammered open and snapped shut.
For me, seeing the thin walls in this valve and the variation in the other immediately turns into differential thermal profiles on all these valves. Which would explain why the tunes have actually had an effect on them. If valve X has a nice even .039 wall versus valve Y at .029 the amount of thermal stress and fatigue They both see is going to be wildly different. Let's hope the new ones had a beefed, more uniform wall. I would still like to see .050 of wall in there, it just seems so thin to be in exhaust temperatures of 1200F-1600F and repeatedly hammered open and snapped shut.
07-28-2012, 12:58 PM
#422
How does GM do part number changes? Everyplace I ever worked when a part of the assembly had its part number changed the next higher assembly/assemblies changed part numbers as well so engineering/manufacturing/field support knew the configuration of the item they were working on. Based on that experience and not knowing how you would keep track of things any other way I assume if the top level part number is the same the complete assembly is the same as assemblies that were produced earlier.
Bill
Bill
GM changed the part number of the axle shaft assembly at least 3 times, but I don't know that the "next higher assembly/assemblies", i.e. the differential, part number was changed. Can anyone show that it was?
http://forums.corvetteforum.com/c6-z...post1554454411
07-28-2012, 01:05 PM
#423
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I'm not sure that I follow what you mean here Bill.
GM changed the part number of the axle shaft assembly at least 3 times, but I don't know that the "next higher assembly/assemblies", i.e. the differential, part number was changed.
http://forums.corvetteforum.com/c6-z...post1554454411
GM changed the part number of the axle shaft assembly at least 3 times, but I don't know that the "next higher assembly/assemblies", i.e. the differential, part number was changed.
http://forums.corvetteforum.com/c6-z...post1554454411
Bill
07-28-2012, 01:10 PM
#424
Basically, the rule where I worked was if a bolt changed part numbers the assembly the bolt went in changed part numbers, and the next higher assembly changed numbers as well all the way to the top assembly. That way we knew how each assembly had been built and could use that information when supporting the assemblies in the field. This gets is more important nowadays when a piece of hardware may have logic configuration code programmed into a memory and you need to verify if the part you have in your hand has the latest logic configuration or is at a back level. When your top level assembly is a helicopter you need to know its configuration in order to provide proper maintenance and field support.
Bill
Bill
But there is no question, that part number for the valves has changed, and without changing the part number for the engines.
http://www.gmpartsdirect.com/catalog/frameset.cfm
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Old Part Number 12578455
New Part Number 12618110
Part Name EXHAUST VALVE
MSRP $40.08
Online Price $29.18
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Genuine Original Equipment Replacement Parts
All Vehicles - 2006 - CHEVROLET - CORVETTE - Z06
Select Section
ALTERNATOR
AUTOMATIC TRANSMISSION
BODY HARDWARE
BRAKES
CLUTCH
COOLING SYSTEM
ELECTRICAL
EMISSION SYSTEM
ENGINE
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Searching for: 12578455
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Part Number "12578455" was found for CHEVROLET, but we could not verify the part fits the selected vehicle.
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Part Number was superceded!
Quick Order
Old Part Number 12578455
New Part Number 12618110
Part Name EXHAUST VALVE
MSRP $40.08
Online Price $29.18
Last edited by '06 Quicksilver Z06; 07-28-2012 at 01:15 PM.
07-28-2012, 01:21 PM
#425
Safety Car
Admit it - you love this forum, and you love the drama! It's like an automotive crack pipe (or doritos?): you can't just do it once and quit.
07-28-2012, 01:24 PM
#426
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Quick, and everyone else
I am using a milling machine with a carbide endmill, and i would advise anyone who cuts these open to be VERY CAREFUL. Sodium is a HIGHLY reactive alkali metal and will burn your skin if it comes in contact with it. I was tossing these in a stainless sink and running water on them to evacuate the sodium. Also the sodium will react with the atmospheric moisture and start to sweat and bubble. you can see it in this picture.
Sodium fill by DSeddon1, on Flickr
I'm using an optical measurement system to assess the wall on these.
I am using a milling machine with a carbide endmill, and i would advise anyone who cuts these open to be VERY CAREFUL. Sodium is a HIGHLY reactive alkali metal and will burn your skin if it comes in contact with it. I was tossing these in a stainless sink and running water on them to evacuate the sodium. Also the sodium will react with the atmospheric moisture and start to sweat and bubble. you can see it in this picture.
Sodium fill by DSeddon1, on Flickr
I'm using an optical measurement system to assess the wall on these.
07-28-2012, 01:35 PM
#427
Safety Car
Quick, and everyone else
I am using a milling machine with a carbide endmill, and i would advise anyone who cuts these open to be VERY CAREFUL. Sodium is a HIGHLY reactive alkali metal and will burn your skin if it comes in contact with it. I was tossing these in a stainless sink and running water on them to evacuate the sodium. Also the sodium will react with the atmospheric moisture and start to sweat and bubble. you can see it in this picture.
Sodium fill by DSeddon1, on Flickr
I'm using an optical measurement system to assess the wall on these.
I am using a milling machine with a carbide endmill, and i would advise anyone who cuts these open to be VERY CAREFUL. Sodium is a HIGHLY reactive alkali metal and will burn your skin if it comes in contact with it. I was tossing these in a stainless sink and running water on them to evacuate the sodium. Also the sodium will react with the atmospheric moisture and start to sweat and bubble. you can see it in this picture.
Sodium fill by DSeddon1, on Flickr
I'm using an optical measurement system to assess the wall on these.
Thanks for your contributions, 240sx!
07-28-2012, 02:38 PM
#428
Safety Car
Quick, and everyone else
I am using a milling machine with a carbide endmill, and i would advise anyone who cuts these open to be VERY CAREFUL. Sodium is a HIGHLY reactive alkali metal and will burn your skin if it comes in contact with it. I was tossing these in a stainless sink and running water on them to evacuate the sodium. Also the sodium will react with the atmospheric moisture and start to sweat and bubble. you can see it in this picture.
Sodium fill by DSeddon1, on Flickr
I'm using an optical measurement system to assess the wall on these.
I am using a milling machine with a carbide endmill, and i would advise anyone who cuts these open to be VERY CAREFUL. Sodium is a HIGHLY reactive alkali metal and will burn your skin if it comes in contact with it. I was tossing these in a stainless sink and running water on them to evacuate the sodium. Also the sodium will react with the atmospheric moisture and start to sweat and bubble. you can see it in this picture.
Sodium fill by DSeddon1, on Flickr
I'm using an optical measurement system to assess the wall on these.
07-28-2012, 04:16 PM
#430
Le Mans Master
What are the implications of a too thin valve sidewall?
Does it distort with high temp? That could explain much, if so.
Does it distort with high temp? That could explain much, if so.
07-28-2012, 05:00 PM
#431
Safety Car
I think what 240sx is saying that the thinner side of the stem wall will transfer more heat in to the guide. From there the oil begins to cook and form deposits that eat into the guide and wear it out quicker. Also the added heat will weaken that section of the stem and make it brittle.
07-28-2012, 05:19 PM
#432
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I think what 240sx is saying that the thinner side of the stem wall will transfer more heat in to the guide. From there the oil begins to cook and form deposits that eat into the guide and wear it out quicker. Also the added heat will weaken that section of the stem and make it brittle.
it's the valves would bet anything on it...I just ordered 3 exhaust valves knew ones will have more info in a week...
07-28-2012, 05:32 PM
#433
Safety Car
Could the Mobil 1 5w 30 be a factor too? (just curious)
07-28-2012, 05:55 PM
#434
Burning Brakes
Glad to see you're back!
Can't wait to see the results. Hoping these valves shed some light on the situation. I want to thank you and 240sx2jz for doing this!
07-28-2012, 05:59 PM
#435
Le Mans Master
Does anyone have any LS6 valves they could send to 240sx2jz?
07-28-2012, 06:05 PM
#436
Burning Brakes
I am extremely interested in the broken 2010 valve. Any way this dealership will let you keep it? I will pay the owner both for it and shipping to 240sx for our analysis. Not joking.
07-28-2012, 07:29 PM
#437
Instructor
Basically, the rule where I worked was if a bolt changed part numbers the assembly the bolt went in changed part numbers, and the next higher assembly changed numbers as well all the way to the top assembly. That way we knew how each assembly had been built and could use that information when supporting the assemblies in the field. This gets is more important nowadays when a piece of hardware may have logic configuration code programmed into a memory and you need to verify if the part you have in your hand has the latest logic configuration or is at a back level. When your top level assembly is a helicopter you need to know its configuration in order to provide proper maintenance and field support.
Bill
Bill
In my industry (pharma) we go by lot coding/dating of all materials that go into a finished product. For example, I can trace any lot of product back to the origin of each raw material via lot coding/dating of each raw material (whether they be chemical, component, reference standards etc). Generally speaking, the next higher number doesn't change, only the version number of the material being changed. Maybe they use something of that sort.
I'm envisioning someone looking at an engine build date and being able to go back to the mfg documents for that engine and detail out exactly what went into it. Not sure if they are that detailed...but we have to be in pharma.
07-28-2012, 07:31 PM
#438
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07-28-2012, 07:33 PM
#439
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07-28-2012, 08:14 PM
#440
Safety Car
Ok I will see what I can do..I will call my friend now with the blown 2010...I'm sure we can get what you need ...he is friends with the owner.........thanks guys all I ever wanted was to help you all...and to save an Awesome car...it's the valves guys. can't prove this 100% but I would bet my house on it