Valves won’t close
#24
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I just typed in "Manley valves miata" in Google and this came up
Manley Performance - Sport Compact
https://5xracing.com/i-23993341-manl...-8l-miata.html
![](https://www.miataturbo.net/images/smilies/confused.gif)
Manley Performance - Sport Compact
https://5xracing.com/i-23993341-manl...-8l-miata.html
![](https://www.miataturbo.net/images/smilies/confused.gif)
Thank you though.
#26
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http://manleyperformance.com/sc/Manley_SportCompact.pdf
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Just kidding around. The main page isn't really that intuitive because the links up top look the same, but point differently depending on whether you're using the sport compact part of the site.
#32
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Likely a combination of a few factors there. Exhaust seat widths are cut wider, the cam profile is not nearly as aggressive in the Miata, and (in turbo applications) you don't have the net-negative force of the air actively pushing the valve/lifter away from the camshaft. Thus, even with the same valve, they fail on the intake side and not the exhaust side.
#37
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Standard Supertech answer. "The issue is clearly the fault of everyone but us even though all our parts break all the time."
I wouldn't put their parts on my lawnmower.
I wouldn't put their parts on my lawnmower.
Last edited by TNTUBA; 05-07-2019 at 07:16 AM.
#38
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FYI I just did a comp. test and all were 200 across the board. The leak down was 1 1/2 to 2% . This is the 3rd season on this engine with the supertech inconel intake +1mm valves from Flyin Miata. I am now a believer as I used to cup the seat faces and loose lash in less then a season with the SS intakes no matter what brand. They ain't cheap, but neither is rebuilding a head a couple time a year, not to mention the time and machining.
Last edited by jmann; 12-11-2019 at 10:57 PM.
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