light is right... but which light ? metallurgy question
Posted: Wed Jul 10, 2019 12:46 pm
considering a light diff nose for my S2 GTS project, I came across 2 alloy versions : in L155 and in L169
chatting with the supplier led to minor differences, L155 being presented as stronger but more brittle than L169, both being equally well suited for race use.
then an internet search lead me to the following
http://www.nortal.co.uk/BSL154%20and%20B5L155/
http://www.nortal.co.uk/BSL169/
besides small tensile and hardness small differences, I also noted a difference in thermal expansion (0.000024 vs. 0.000021) which is where aluminum alloy is reputedly source of issues on elan diff applications...
for completeness, I'm planning to mate this to a magnesium rear cover. Options for diff side adjusters are steel or Si Bronze (again for thermal expansion considerations)...
So I'm interested in any opinion from the forum, real life racing experience of course (esp. regarding any of the above alloys), but also from a metallurgy if the specs can lead to a clear conclusion...
thank you all for any insight or observation !
chatting with the supplier led to minor differences, L155 being presented as stronger but more brittle than L169, both being equally well suited for race use.
then an internet search lead me to the following
http://www.nortal.co.uk/BSL154%20and%20B5L155/
http://www.nortal.co.uk/BSL169/
besides small tensile and hardness small differences, I also noted a difference in thermal expansion (0.000024 vs. 0.000021) which is where aluminum alloy is reputedly source of issues on elan diff applications...
for completeness, I'm planning to mate this to a magnesium rear cover. Options for diff side adjusters are steel or Si Bronze (again for thermal expansion considerations)...
So I'm interested in any opinion from the forum, real life racing experience of course (esp. regarding any of the above alloys), but also from a metallurgy if the specs can lead to a clear conclusion...
thank you all for any insight or observation !