8ob
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- Nescient in the vale
Just need to run this by the knowledgeable collective here.
I need to order the steel blanks for some flywheels I need turned up for some automotive sillyness. I have googled this to death and am getting nowhere, it seems EN8 normalised is used a lot for low volume production racing flywheels running organic friction material. I cant find any blurb anywhere that spills the beans on the grade of steel that metallic clutches run on, the nearest I can get is the information below but cant make any sense of this as to grade of steel, anyone?
Bob
Flywheel
A purpose machined flywheel is required. The friction face should be a good quality close grained Cast Iron or Steel (0.35 / 0.45% Carbon, Hardness 200 Hb minimum), with a surface finish of 0.75µm RA (30 CLA) maximum.
Run out when assembled to the crankshaft must not exceed 0.08mm (0.003") maximum at 77mm (3.03") radius. Fixing holes and location spigot to be machined as shown on the appropriate flywheel mounting drawings.
Flywheel Mounting details for Ø115mm to Ø184mm, and for Ø200mm to Ø215mm clutches.
N.B. Cast Iron flywheels should not be used above 10000 rpm.
I need to order the steel blanks for some flywheels I need turned up for some automotive sillyness. I have googled this to death and am getting nowhere, it seems EN8 normalised is used a lot for low volume production racing flywheels running organic friction material. I cant find any blurb anywhere that spills the beans on the grade of steel that metallic clutches run on, the nearest I can get is the information below but cant make any sense of this as to grade of steel, anyone?
Bob
Flywheel
A purpose machined flywheel is required. The friction face should be a good quality close grained Cast Iron or Steel (0.35 / 0.45% Carbon, Hardness 200 Hb minimum), with a surface finish of 0.75µm RA (30 CLA) maximum.
Run out when assembled to the crankshaft must not exceed 0.08mm (0.003") maximum at 77mm (3.03") radius. Fixing holes and location spigot to be machined as shown on the appropriate flywheel mounting drawings.
Flywheel Mounting details for Ø115mm to Ø184mm, and for Ø200mm to Ø215mm clutches.
N.B. Cast Iron flywheels should not be used above 10000 rpm.