7 years ago#1
Force_of_light
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Am I correct in assuming Miata valves are adjusted by replacing shims? How frequently is this required, and how much does the dealer charge? Do any of you adjust your own valves at home? Any special tools required, and are they readily available?

Thanks

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7 years ago#2
Shaen
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The 90-97 lifters are hydralic so no adjustments. The 99+ are solid are do require adjustment if out of spec. (.008-.010'. They are shim over bucket style and are approx $5/ea from Mazda Comp. You can use a special tool to replace the shims without removing the cam (available from Mazda $$) but most just take the extra effort to remove the cams and trial-and-error fit them.

See http://www.solomiata.com/street.html and miataforum.com 99+ forum.

Randy Find out about CSP Miata sway bars,replacing the 1.6 flowmeter w/larger RX7 unit, 1.6 to 1.8 swap, determine if you have a LSD,Torsen LSD swap, Recipe for HP, or read about Mazda 4cylinder interchangability? http://www.solomiata.com

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7 years ago#3
aaa
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90-97 Miatas have hydraulic adjusters, no manual maintenance is required. 99+ are manual, but I don't know the details.

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7 years ago#4
AMcCrea
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Why did they go from hydraulic to solid lifters.

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7 years ago#5
WalksAmongStars
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Primarily there were too many complaints of lifter tick. They also support a higher redline as in the 2001.

Randy Find out about CSP Miata sway bars,replacing the 1.6 flowmeter w/larger RX7 unit, 1.6 to 1.8 swap, determine if you have a LSD,Torsen LSD swap, Recipe for HP, or read about Mazda 4cylinder interchangability? http://www.solomiata.com

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