Help!! My Intake Valves Keep Wearing Out!
#22
If running light doubles and not critically money shifted (8500+), then it's the seats. No installed or cut correctly. I've posted this before but BP heads don't flow much regardless of what you do so there is no sense in getting agro with teensy drag style valve seats that destroy valves in 10 hrs. The seats themselves need to be the correct hardened type as well. We lost a head a few years ago that had the wrong seats installed, also ate it's valves in short order.
Test the valve springs if you like but we have not encountered any losses in spring rate in any of our ST valve spring sets. Every set that goes into or comes out of one of our engines in is checked.
Test the valve springs if you like but we have not encountered any losses in spring rate in any of our ST valve spring sets. Every set that goes into or comes out of one of our engines in is checked.
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#23
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If running light doubles and not critically money shifted (8500+), then it's the seats. No installed or cut correctly. I've posted this before but BP heads don't flow much regardless of what you do so there is no sense in getting agro with teensy drag style valve seats that destroy valves in 10 hrs. The seats themselves need to be the correct hardened type as well. We lost a head a few years ago that had the wrong seats installed, also ate it's valves in short order.
Last edited by hornetball; 01-04-2015 at 08:36 PM.
#26
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Its not metalurgically (did I make that up?) possible for a spring NOT to lose pressure once it's broken in. Valve springs are a wear item in a race motor and should be treated as such....valves shouldn't be wearing out before the springs do though.
#31
I think either of these guys could help you out with your valve issues
K Miata Home
NA/B 90-2005 - LFX products - V8 Roadsters
K Miata Home
NA/B 90-2005 - LFX products - V8 Roadsters
#32
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I think either of these guys could help you out with your valve issues
K Miata Home
NA/B 90-2005 - LFX products - V8 Roadsters
K Miata Home
NA/B 90-2005 - LFX products - V8 Roadsters
Inching closer . . . .
#37
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Please take some close up pics of the valves and seats.
We can post and compare our cases when I get a chance to pull my head.
(Will at least be a couple days before this snow storm goes away)
We can post and compare our cases when I get a chance to pull my head.
(Will at least be a couple days before this snow storm goes away)
#38
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Intake Valve (trashed):
Exhaust Valve (normal):
Closeup of that Intake Valve:
I expect this set to look similar. They are very recessed into the head.
#39
I'm expecting to see my intake valves look the same. I'm hoping otherwise. My intake valves all tightened up, builder (trackspeed) recommended reshimming and checking it more often. And I hope its just normal wear. If it opens up another .001 in the first 2 auto-x's the heads coming off and I know that this will the problem. I dont know why no one here is using the manley valves they cost $10 more per set of 8 and use a higher quality stainless. You arent even close to the first one to see intake valves exactly like that, it was the plague of a certain west coast csp car. I think he adjusted his machinist adjusted his valve job to compensate or something.
Add me to the list of people hearing about other people's ST springs loosing seat pressure. Those super cheap BC springs in bogous svo's thread seem better and better.
Add me to the list of people hearing about other people's ST springs loosing seat pressure. Those super cheap BC springs in bogous svo's thread seem better and better.
Last edited by Leafy; 01-06-2015 at 07:42 AM.
#40
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I dont know why no one here is using the manley valves they cost $10 more per set of 16 and use a higher quality stainless. You arent even close to the first one to see intake valves exactly like that, it was the plague of a certain west coast csp car. I think he adjusted his machinist adjusted his valve job to compensate or something.
Cognitive dissonance at its finest. Jesus ******* christ.