[Z06] Who's running Ferrea hollow stemmed exhaust valves? F2042P
#1
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Who's running Ferrea hollow stemmed exhaust valves? F2042P
Who is running the hollow stemmed valves from Ferrea? If so how's your experience been with them?
Thanks!
Joshua
Edit: If you are, please leave info about your setup:
Guides
Cam
Springs
Red line limit?
Valves
Other mods
Thanks!
Thanks!
Joshua
Edit: If you are, please leave info about your setup:
Guides
Cam
Springs
Red line limit?
Valves
Other mods
Thanks!
Last edited by fendersceptre; 04-27-2014 at 11:27 AM. Reason: More Info
#6
Evil427 runs it. As does NavyAirTraffic.
A few others on the Registry listing run it as well.
You might try contacting them.
The people at American Heritage may be able to give you some more information on it as well, they offer it in one of their head packages.
A few others on the Registry listing run it as well.
You might try contacting them.
The people at American Heritage may be able to give you some more information on it as well, they offer it in one of their head packages.
#7
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Evil427 runs it. As does NavyAirTraffic.
A few others on the Registry listing run it as well.
You might try contacting them.
The people at American Heritage may be able to give you some more information on it as well, they offer it in one of their head packages.
A few others on the Registry listing run it as well.
You might try contacting them.
The people at American Heritage may be able to give you some more information on it as well, they offer it in one of their head packages.
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Thanks for the info!
Can you confirm that they are one piece?
Also what springs are you running with them? I was thinking Katech torquer cam with the PSI Springs that came with the cam.
Thanks!
Joshua
Can you confirm that they are one piece?
Also what springs are you running with them? I was thinking Katech torquer cam with the PSI Springs that came with the cam.
Thanks!
Joshua
#11
Melting Slicks
I have them in mine
I have had them in the car about 6-7 months. About 85 grams.
#12
.
Last edited by Mark2009; 04-25-2014 at 07:19 PM.
#13
Like Quick stated, I run them. Best thing to do is contact Kohle at American Heritage, very knowledgable and generous with his time.
However the real reason I chose the F2042P's is because of what Richard (WCCH) said about the sodium valves on a different forum. Good luck!
However the real reason I chose the F2042P's is because of what Richard (WCCH) said about the sodium valves on a different forum. Good luck!
We have definitely seen excessive wear in some LS7 exhaust guides. Mostly coming from engines with over 30k on the clock. We have seen some heads show inconsistent wear requiring only one or two guides needing replacement. It appears that the sodium exhaut valves are transmitting an excessive amount of heat from the stem to the guide. In some cases the oil is BBQ'd in the guide and the lack of lubrication and cooling from the oil causes the excessive wear (mostly in the lower half of the exhaut guide). We've measured some guides as having over .004" of wear in the lower 1" of exhaust guide length. Porsche 911's suffer the same type of related guide wear on the exhaust side.
The next item to note regarding the sodium exhaust valves relates to the wall thickness of the sodium exhaust valve stem. It's only .040" thick and makes for a fragile exhaust valve. GM uses a good quality steel material but the design spec. renders the valves brittle at the neck. Hence the reason we choose the replace the factory units with stainless or inconel. The exhaust valves we use are manufactured with a .001" oversized stem size which allows us to hone the exhaust guides and remove most or all of the taper in the bore. In cases with excessive wear we replace the guides with bronze.
The next item to note regarding the sodium exhaust valves relates to the wall thickness of the sodium exhaust valve stem. It's only .040" thick and makes for a fragile exhaust valve. GM uses a good quality steel material but the design spec. renders the valves brittle at the neck. Hence the reason we choose the replace the factory units with stainless or inconel. The exhaust valves we use are manufactured with a .001" oversized stem size which allows us to hone the exhaust guides and remove most or all of the taper in the bore. In cases with excessive wear we replace the guides with bronze.
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Hi Navy,
Thanks for the info! Are you limiting your red line at all? Also what springs and cam are you running?
Thanks!
Joshua
Thanks for the info! Are you limiting your red line at all? Also what springs and cam are you running?
Thanks!
Joshua
Like Quick stated, I run them. Best thing to do is contact Kohle at American Heritage, very knowledgable and generous with his time.
However the real reason I chose the F2042P's is because of what Richard (WCCH) said about the sodium valves on a different forum. Good luck!
However the real reason I chose the F2042P's is because of what Richard (WCCH) said about the sodium valves on a different forum. Good luck!
#15
Team Owner
#16
Burning Brakes
QUOTE:
We have definitely seen excessive wear in some LS7 exhaust guides. Mostly coming from engines with over 30k on the clock. We have seen some heads show inconsistent wear requiring only one or two guides needing replacement. It appears that the sodium exhaut valves are transmitting an excessive amount of heat from the stem to the guide. In some cases the oil is BBQ'd in the guide and the lack of lubrication and cooling from the oil causes the excessive wear (mostly in the lower half of the exhaut guide). We've measured some guides as having over .004" of wear in the lower 1" of exhaust guide length. Porsche 911's suffer the same type of related guide wear on the exhaust side.
The next item to note regarding the sodium exhaust valves relates to the wall thickness of the sodium exhaust valve stem. It's only .040" thick and makes for a fragile exhaust valve. GM uses a good quality steel material but the design spec. renders the valves brittle at the neck. Hence the reason we choose the replace the factory units with stainless or inconel. The exhaust valves we use are manufactured with a .001" oversized stem size which allows us to hone the exhaust guides and remove most or all of the taper in the bore. In cases with excessive wear we replace the guides with bronze.
Man, i don't know how much better some people on here need it explained to them!?
We have definitely seen excessive wear in some LS7 exhaust guides. Mostly coming from engines with over 30k on the clock. We have seen some heads show inconsistent wear requiring only one or two guides needing replacement. It appears that the sodium exhaut valves are transmitting an excessive amount of heat from the stem to the guide. In some cases the oil is BBQ'd in the guide and the lack of lubrication and cooling from the oil causes the excessive wear (mostly in the lower half of the exhaut guide). We've measured some guides as having over .004" of wear in the lower 1" of exhaust guide length. Porsche 911's suffer the same type of related guide wear on the exhaust side.
The next item to note regarding the sodium exhaust valves relates to the wall thickness of the sodium exhaust valve stem. It's only .040" thick and makes for a fragile exhaust valve. GM uses a good quality steel material but the design spec. renders the valves brittle at the neck. Hence the reason we choose the replace the factory units with stainless or inconel. The exhaust valves we use are manufactured with a .001" oversized stem size which allows us to hone the exhaust guides and remove most or all of the taper in the bore. In cases with excessive wear we replace the guides with bronze.
Man, i don't know how much better some people on here need it explained to them!?
Last edited by ramairws6; 04-27-2014 at 10:06 AM.
#17
I'd like to see these valves on the spintron machine:
Torquer cam/psi beehive springs/ferrea hollow SS valves. My guess, they would show stability up to 7,100. But I'd like to see the test run
Torquer cam/psi beehive springs/ferrea hollow SS valves. My guess, they would show stability up to 7,100. But I'd like to see the test run
#18
Yeah that made a lot or sense till people started realizing that it valve guide issues aren't isolated to just exhuast sides.
I think now the consensus is it's a valve seat machining error and there aren't really any issues with the valves.
That being said, a two piece valve won't stay together after abuse or machining errors as well as a once piece..
I think now the consensus is it's a valve seat machining error and there aren't really any issues with the valves.
That being said, a two piece valve won't stay together after abuse or machining errors as well as a once piece..
#19
By the way, folks, ramair's post was plagiarized, verbatim, from a four-year-old post by someone else on another forum: http://ls1tech.com/forums/13450863-post12.html .