Exhaust valve material-Is Iconel needed
#1
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Exhaust valve material-Is Iconel needed
Just had a quick question for any of the other high powered miata turbo car owners. I am building a head and was wondering about materials for valves.
Someone I know/trust said that he has seen the nitrided black supertech exhaust valves fail in turbo motors presumably from overheating and bending and that he would only use Iconel or a different alloy like the manley race valves for exhaust valves in a turbo application
I know a lot of miata folks run supertech valves-Do you use the iconel valves for exhaust or the black nitrided valves?
Someone I know/trust said that he has seen the nitrided black supertech exhaust valves fail in turbo motors presumably from overheating and bending and that he would only use Iconel or a different alloy like the manley race valves for exhaust valves in a turbo application
I know a lot of miata folks run supertech valves-Do you use the iconel valves for exhaust or the black nitrided valves?
#5
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Bringing this back to life.
Is this still the consensus, not to worry about Iconel exhaust valves if your have sufficient cooling and are not constantly in boost on a track with constant loads? I'll be aiming for 300whp but mainly street driven.
Is this still the consensus, not to worry about Iconel exhaust valves if your have sufficient cooling and are not constantly in boost on a track with constant loads? I'll be aiming for 300whp but mainly street driven.
#7
Just had a quick question for any of the other high powered miata turbo car owners. I am building a head and was wondering about materials for valves.
Someone I know/trust said that he has seen the nitrided black supertech exhaust valves fail in turbo motors presumably from overheating and bending and that he would only use Iconel or a different alloy like the manley race valves for exhaust valves in a turbo application
I know a lot of miata folks run supertech valves-Do you use the iconel valves for exhaust or the black nitrided valves?
Someone I know/trust said that he has seen the nitrided black supertech exhaust valves fail in turbo motors presumably from overheating and bending and that he would only use Iconel or a different alloy like the manley race valves for exhaust valves in a turbo application
I know a lot of miata folks run supertech valves-Do you use the iconel valves for exhaust or the black nitrided valves?
#8
Just some FUD regarding exotic materials in valves;
Some valves are fused from two materials with the transition halfway up the stem. Several of them have snapped at this precise position (most examples I've heard of is from Evos).
Maybe the reason is to have normal stainless in the grove for the retainer locks, but you don't know until you use a magnet on them (no way to know when ordering).
Some valves are fused from two materials with the transition halfway up the stem. Several of them have snapped at this precise position (most examples I've heard of is from Evos).
Maybe the reason is to have normal stainless in the grove for the retainer locks, but you don't know until you use a magnet on them (no way to know when ordering).
#9
Bring this back from the grave to see if opinions have changed on the subject.
I will be building a head for boost and am sourcing parts now. It will be port and polished with +1mm intake valves. Goal is about 250-275 whp or so.
The car will be mostly track driven. Does innconel give more peace of mind than the nitrided ones? Also should I be going with +1mm or +2mm?
I will be building a head for boost and am sourcing parts now. It will be port and polished with +1mm intake valves. Goal is about 250-275 whp or so.
The car will be mostly track driven. Does innconel give more peace of mind than the nitrided ones? Also should I be going with +1mm or +2mm?
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